Structure updated and intqpipopt files added

1 files changed, 2143 insertions, 0 deletions

diff --git a/newstructure/thirdparty/linux/include/coin/OsiSolverInterface.hpp b/newstructure/thirdparty/linux/include/coin/OsiSolverInterface.hpp
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+++ b/newstructure/thirdparty/linux/include/coin/OsiSolverInterface.hpp
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+// Copyright (C) 2000, International Business Machines
+// Corporation and others.  All Rights Reserved.
+// This code is licensed under the terms of the Eclipse Public License (EPL).
+
+#ifndef OsiSolverInterface_H
+#define OsiSolverInterface_H
+
+#include <cstdlib>
+#include <string>
+#include <vector>
+
+#include "CoinTypes.hpp"
+#include "CoinMessageHandler.hpp"
+#include "CoinPackedVectorBase.hpp"
+#include "CoinPackedMatrix.hpp"
+#include "CoinWarmStart.hpp"
+#include "CoinFinite.hpp"
+#include "CoinError.hpp"
+
+#include "OsiCollections.hpp"
+#include "OsiSolverParameters.hpp"
+
+class CoinSnapshot;
+class CoinLpIO;
+class CoinMpsIO;
+
+class OsiCuts;
+class OsiAuxInfo;
+class OsiRowCut;
+class OsiRowCutDebugger;
+class CoinSet;
+class CoinBuild;
+class CoinModel;
+class OsiSolverBranch;
+class OsiSolverResult;
+class OsiObject;
+
+
+//#############################################################################
+
+/*! \brief Abstract Base Class for describing an interface to a solver.
+
+  Many OsiSolverInterface query methods return a const pointer to the
+  requested read-only data. If the model data is changed or the solver
+  is called, these pointers may no longer be valid and should be 
+  refreshed by invoking the member function to obtain an updated copy
+  of the pointer.
+  For example:
+  \code
+      OsiSolverInterface solverInterfacePtr ;
+      const double * ruBnds = solverInterfacePtr->getRowUpper();
+      solverInterfacePtr->applyCuts(someSetOfCuts);
+      // ruBnds is no longer a valid pointer and must be refreshed
+      ruBnds = solverInterfacePtr->getRowUpper();
+  \endcode
+
+  Querying a problem that has no data associated with it will result in
+  zeros for the number of rows and columns, and NULL pointers from
+  the methods that return vectors.
+*/
+
+class OsiSolverInterface  {
+   friend void OsiSolverInterfaceCommonUnitTest(
+      const OsiSolverInterface* emptySi,
+      const std::string & mpsDir,
+      const std::string & netlibDir);
+   friend void OsiSolverInterfaceMpsUnitTest(
+      const std::vector<OsiSolverInterface*> & vecSiP,
+      const std::string & mpsDir);
+
+public:
+
+  /// Internal class for obtaining status from the applyCuts method 
+  class ApplyCutsReturnCode {
+    friend class OsiSolverInterface;
+    friend class OsiClpSolverInterface;
+    friend class OsiGrbSolverInterface;
+
+  public:
+    ///@name Constructors and desctructors
+    //@{
+      /// Default constructor
+      ApplyCutsReturnCode():
+	 intInconsistent_(0),
+	 extInconsistent_(0),
+	 infeasible_(0),
+	 ineffective_(0),
+	 applied_(0) {} 
+      /// Copy constructor
+      ApplyCutsReturnCode(const ApplyCutsReturnCode & rhs):
+	 intInconsistent_(rhs.intInconsistent_),
+	 extInconsistent_(rhs.extInconsistent_),
+	 infeasible_(rhs.infeasible_),
+	 ineffective_(rhs.ineffective_),
+	 applied_(rhs.applied_) {} 
+      /// Assignment operator
+      ApplyCutsReturnCode & operator=(const ApplyCutsReturnCode& rhs)
+      { 
+	if (this != &rhs) { 
+	  intInconsistent_ = rhs.intInconsistent_;
+	  extInconsistent_ = rhs.extInconsistent_;
+	  infeasible_      = rhs.infeasible_;
+	  ineffective_     = rhs.ineffective_;
+	  applied_         = rhs.applied_;
+	}
+	return *this;
+      }
+      /// Destructor
+      ~ApplyCutsReturnCode(){}
+    //@}
+
+    /**@name Accessing return code attributes */
+    //@{
+      /// Number of logically inconsistent cuts
+      inline int getNumInconsistent() const
+      {return intInconsistent_;}
+      /// Number of cuts inconsistent with the current model
+      inline int getNumInconsistentWrtIntegerModel() const
+      {return extInconsistent_;}
+      /// Number of cuts that cause obvious infeasibility
+      inline int getNumInfeasible() const
+      {return infeasible_;}
+      /// Number of redundant or ineffective cuts
+      inline int getNumIneffective() const
+      {return ineffective_;}
+      /// Number of cuts applied
+      inline int getNumApplied() const
+      {return applied_;}
+    //@}
+
+  private: 
+    /**@name Private methods */
+    //@{
+      /// Increment logically inconsistent cut counter 
+      inline void incrementInternallyInconsistent(){intInconsistent_++;}
+      /// Increment model-inconsistent counter
+      inline void incrementExternallyInconsistent(){extInconsistent_++;}
+      /// Increment infeasible cut counter
+      inline void incrementInfeasible(){infeasible_++;}
+      /// Increment ineffective cut counter
+      inline void incrementIneffective(){ineffective_++;}
+      /// Increment applied cut counter
+      inline void incrementApplied(){applied_++;}
+    //@}
+
+    ///@name Private member data
+    //@{
+      /// Counter for logically inconsistent cuts
+      int intInconsistent_;
+      /// Counter for model-inconsistent cuts
+      int extInconsistent_;
+      /// Counter for infeasible cuts
+      int infeasible_;
+      /// Counter for ineffective cuts
+      int ineffective_;
+      /// Counter for applied cuts
+      int applied_;
+    //@}
+  };
+
+  //---------------------------------------------------------------------------
+
+  ///@name Solve methods 
+  //@{
+    /// Solve initial LP relaxation 
+    virtual void initialSolve() = 0; 
+
+    /*! \brief Resolve an LP relaxation after problem modification
+
+      Note the `re-' in `resolve'. initialSolve() should be used to solve the
+      problem for the first time.
+    */
+    virtual void resolve() = 0;
+
+    /// Invoke solver's built-in enumeration algorithm
+    virtual void branchAndBound() = 0;
+
+#ifdef CBC_NEXT_VERSION
+    /*
+      Would it make sense to collect all of these routines in a `MIP Helper'
+      section? It'd make it easier for users and implementors to find them.
+    */
+    /**
+       Solve 2**N (N==depth) problems and return solutions and bases.
+       There are N branches each of which changes bounds on both sides
+       as given by branch.  The user should provide an array of (empty)
+       results which will be filled in.  See OsiSolveResult for more details
+       (in OsiSolveBranch.?pp) but it will include a basis and primal solution.
+
+       The order of results is left to right at feasible leaf nodes so first one
+       is down, down, .....
+
+       Returns number of feasible leaves.  Also sets number of solves done and number
+       of iterations.
+
+       This is provided so a solver can do faster.
+
+       If forceBranch true then branch done even if satisfied
+    */
+    virtual int solveBranches(int depth,const OsiSolverBranch * branch,
+			      OsiSolverResult * result,
+			      int & numberSolves, int & numberIterations,
+			      bool forceBranch=false);
+#endif
+  //@}
+
+  //---------------------------------------------------------------------------
+  /**@name Parameter set/get methods
+
+     The set methods return true if the parameter was set to the given value,
+     false otherwise. When a set method returns false, the original value (if
+     any) should be unchanged.  There can be various reasons for failure: the
+     given parameter is not applicable for the solver (e.g., refactorization
+     frequency for the volume algorithm), the parameter is not yet
+     implemented for the solver or simply the value of the parameter is out
+     of the range the solver accepts. If a parameter setting call returns
+     false check the details of your solver.
+
+     The get methods return true if the given parameter is applicable for the
+     solver and is implemented. In this case the value of the parameter is
+     returned in the second argument. Otherwise they return false.
+
+     \note
+     There is a default implementation of the set/get
+     methods, namely to store/retrieve the given value using an array in the
+     base class. A specific solver implementation can use this feature, for
+     example, to store parameters that should be used later on. Implementors
+     of a solver interface should overload these functions to provide the
+     proper interface to and accurately reflect the capabilities of a
+     specific solver.
+
+     The format for hints is slightly different in that a boolean specifies
+     the sense of the hint and an enum specifies the strength of the hint.
+     Hints should be initialised when a solver is instantiated.
+     (See OsiSolverParameters.hpp for defined hint parameters and strength.)
+     When specifying the sense of the hint, a value of true means to work with
+     the hint, false to work against it.  For example,
+     <ul>
+       <li> \code setHintParam(OsiDoScale,true,OsiHintTry) \endcode
+	    is a mild suggestion to the solver to scale the constraint
+	    system.
+       <li> \code setHintParam(OsiDoScale,false,OsiForceDo) \endcode
+	    tells the solver to disable scaling, or throw an exception if
+	    it cannot comply.
+     </ul>
+     As another example, a solver interface could use the value and strength
+     of the \c OsiDoReducePrint hint to adjust the amount of information
+     printed by the interface and/or solver.  The extent to which a solver
+     obeys hints is left to the solver.  The value and strength returned by
+     \c getHintParam will match the most recent call to \c setHintParam,
+     and will not necessarily reflect the solver's ability to comply with the
+     hint.  If the hint strength is \c OsiForceDo, the solver is required to
+     throw an exception if it cannot perform the specified action.
+
+     \note
+     As with the other set/get methods, there is a default implementation
+     which maintains arrays in the base class for hint sense and strength.
+     The default implementation does not store the \c otherInformation
+     pointer, and always throws an exception for strength \c OsiForceDo.
+     Implementors of a solver interface should override these functions to
+     provide the proper interface to and accurately reflect the capabilities
+     of a specific solver.
+  */
+  //@{
+    //! Set an integer parameter
+    virtual bool setIntParam(OsiIntParam key, int value) {
+      if (key == OsiLastIntParam) return (false) ;
+      intParam_[key] = value;
+      return true;
+    }
+    //! Set a double parameter
+    virtual bool setDblParam(OsiDblParam key, double value) {
+      if (key == OsiLastDblParam) return (false) ;
+      dblParam_[key] = value;
+      return true;
+    }
+    //! Set a string parameter
+    virtual bool setStrParam(OsiStrParam key, const std::string & value) {
+      if (key == OsiLastStrParam) return (false) ;
+      strParam_[key] = value;
+      return true;
+    }
+    /*! \brief Set a hint parameter
+
+      The \c otherInformation parameter can be used to pass in an arbitrary
+      block of information which is interpreted by the OSI and the underlying
+      solver.  Users are cautioned that this hook is solver-specific.
+
+      Implementors:
+      The default implementation completely ignores \c otherInformation and
+      always throws an exception for OsiForceDo. This is almost certainly not
+      the behaviour you want; you really should override this method.
+    */
+    virtual bool setHintParam(OsiHintParam key, bool yesNo=true,
+			      OsiHintStrength strength=OsiHintTry,
+			      void * /*otherInformation*/ = NULL) {
+      if (key==OsiLastHintParam)
+	return false; 
+      hintParam_[key] = yesNo;
+      hintStrength_[key] = strength;
+      if (strength == OsiForceDo)
+	throw CoinError("OsiForceDo illegal",
+			"setHintParam", "OsiSolverInterface");
+      return true;
+    }
+    //! Get an integer parameter
+    virtual bool getIntParam(OsiIntParam key, int& value) const {
+      if (key == OsiLastIntParam) return (false) ;
+      value = intParam_[key];
+      return true;
+    }
+    //! Get a double parameter
+    virtual bool getDblParam(OsiDblParam key, double& value) const {
+      if (key == OsiLastDblParam) return (false) ;
+      value = dblParam_[key];
+      return true;
+    }
+    //! Get a string parameter
+    virtual bool getStrParam(OsiStrParam key, std::string& value) const {
+      if (key == OsiLastStrParam) return (false) ;
+      value = strParam_[key];
+      return true;
+    }
+    /*! \brief Get a hint parameter (all information)
+
+	Return all available information for the hint: sense, strength,
+	and any extra information associated with the hint.
+
+	Implementors: The default implementation will always set
+	\c otherInformation to NULL. This is almost certainly not the
+	behaviour you want; you really should override this method.
+    */
+    virtual bool getHintParam(OsiHintParam key, bool& yesNo,
+			      OsiHintStrength& strength,
+			      void *& otherInformation) const {
+      if (key==OsiLastHintParam)
+	return false; 
+      yesNo = hintParam_[key];
+      strength = hintStrength_[key];
+      otherInformation=NULL;
+      return true;
+    }
+    /*! \brief Get a hint parameter (sense and strength only)
+
+	Return only the sense and strength of the hint.
+    */
+    virtual bool getHintParam(OsiHintParam key, bool& yesNo,
+			      OsiHintStrength& strength) const {
+      if (key==OsiLastHintParam)
+	return false; 
+      yesNo = hintParam_[key];
+      strength = hintStrength_[key];
+      return true;
+    }
+    /*! \brief Get a hint parameter (sense only)
+
+	Return only the sense (true/false) of the hint.
+    */
+    virtual bool getHintParam(OsiHintParam key, bool& yesNo) const {
+      if (key==OsiLastHintParam)
+	return false; 
+      yesNo = hintParam_[key];
+      return true;
+    }
+    /*! \brief Copy all parameters in this section from one solver to another
+
+      Note that the current implementation also copies the appData block,
+      message handler, and rowCutDebugger. Arguably these should have
+      independent copy methods.
+    */
+    void copyParameters(OsiSolverInterface & rhs);
+
+    /** \brief Return the integrality tolerance of the underlying solver.
+    
+	We should be able to get an integrality tolerance, but
+        until that time just use the primal tolerance
+
+	\todo
+	This method should be replaced; it's architecturally wrong.  This
+	should be an honest dblParam with a keyword. Underlying solvers
+	that do not support integer variables should return false for set and
+	get on this parameter.  Underlying solvers that support integrality
+	should add this to the parameters they support, using whatever
+	tolerance is appropriate.  -lh, 091021-
+    */
+    inline double getIntegerTolerance() const
+    { return dblParam_[OsiPrimalTolerance];}
+  //@}
+
+  //---------------------------------------------------------------------------
+  ///@name Methods returning info on how the solution process terminated
+  //@{
+    /// Are there numerical difficulties?
+    virtual bool isAbandoned() const = 0;
+    /// Is optimality proven?
+    virtual bool isProvenOptimal() const = 0;
+    /// Is primal infeasibility proven?
+    virtual bool isProvenPrimalInfeasible() const = 0;
+    /// Is dual infeasibility proven?
+    virtual bool isProvenDualInfeasible() const = 0;
+    /// Is the given primal objective limit reached?
+    virtual bool isPrimalObjectiveLimitReached() const;
+    /// Is the given dual objective limit reached?
+    virtual bool isDualObjectiveLimitReached() const;
+    /// Iteration limit reached?
+    virtual bool isIterationLimitReached() const = 0;
+  //@}
+
+  //---------------------------------------------------------------------------
+  /** \name Warm start methods
+
+    Note that the warm start methods return a generic CoinWarmStart object.
+    The precise characteristics of this object are solver-dependent. Clients
+    who wish to maintain a maximum degree of solver independence should take
+    care to avoid unnecessary assumptions about the properties of a warm start
+    object.
+  */
+  //@{
+    /*! \brief Get an empty warm start object
+      
+      This routine returns an empty warm start object. Its purpose is
+      to provide a way for a client to acquire a warm start object of the
+      appropriate type for the solver, which can then be resized and modified
+      as desired.
+    */
+
+    virtual CoinWarmStart *getEmptyWarmStart () const = 0 ;
+
+    /** \brief Get warm start information.
+
+      Return warm start information for the current state of the solver
+      interface. If there is no valid warm start information, an empty warm
+      start object wil be returned.
+    */
+    virtual CoinWarmStart* getWarmStart() const = 0;
+    /** \brief Get warm start information.
+
+      Return warm start information for the current state of the solver
+      interface. If there is no valid warm start information, an empty warm
+      start object wil be returned.  This does not necessarily create an 
+      object - may just point to one.  must Delete set true if user
+      should delete returned object.
+    */
+    virtual CoinWarmStart* getPointerToWarmStart(bool & mustDelete) ;
+
+    /** \brief Set warm start information.
+    
+      Return true or false depending on whether the warm start information was
+      accepted or not.
+      By definition, a call to setWarmStart with a null parameter should
+      cause the solver interface to refresh its warm start information
+      from the underlying solver.
+   */
+    virtual bool setWarmStart(const CoinWarmStart* warmstart) = 0;
+  //@}
+
+  //---------------------------------------------------------------------------
+  /**@name Hot start methods
+  
+     Primarily used in strong branching. The user can create a hot start
+     object --- a snapshot of the optimization process --- then reoptimize
+     over and over again, starting from the same point.
+
+     \note
+     <ul>
+     <li> Between hot started optimizations only bound changes are allowed.
+     <li> The copy constructor and assignment operator should NOT copy any
+          hot start information.
+     <li> The default implementation simply extracts a warm start object in
+          \c markHotStart, resets to the warm start object in
+	  \c solveFromHotStart, and deletes the warm start object in
+	  \c unmarkHotStart.
+	  <em>Actual solver implementations are encouraged to do better.</em>
+     </ul>
+
+  */
+  //@{
+    /// Create a hot start snapshot of the optimization process.
+    virtual void markHotStart();
+    /// Optimize starting from the hot start snapshot.
+    virtual void solveFromHotStart();
+    /// Delete the hot start snapshot.
+    virtual void unmarkHotStart();
+  //@}
+
+  //---------------------------------------------------------------------------
+  /**@name Problem query methods
+
+   Querying a problem that has no data associated with it will result in
+   zeros for the number of rows and columns, and NULL pointers from the
+   methods that return vectors.
+
+   Const pointers returned from any data-query method are valid as long as
+   the data is unchanged and the solver is not called.
+  */
+  //@{
+    /// Get the number of columns
+    virtual int getNumCols() const = 0;
+
+    /// Get the number of rows
+    virtual int getNumRows() const = 0;
+
+    /// Get the number of nonzero elements
+    virtual int getNumElements() const = 0;
+
+    /// Get the number of integer variables
+    virtual int getNumIntegers() const ;
+
+    /// Get a pointer to an array[getNumCols()] of column lower bounds
+    virtual const double * getColLower() const = 0;
+
+    /// Get a pointer to an array[getNumCols()] of column upper bounds
+    virtual const double * getColUpper() const = 0;
+
+    /*! \brief Get a pointer to an array[getNumRows()] of row constraint senses.
+
+      <ul>
+      <li>'L': <= constraint
+      <li>'E': =  constraint
+      <li>'G': >= constraint
+      <li>'R': ranged constraint
+      <li>'N': free constraint
+      </ul>
+    */
+    virtual const char * getRowSense() const = 0;
+
+    /*! \brief Get a pointer to an array[getNumRows()] of row right-hand sides
+
+      <ul>
+	<li> if getRowSense()[i] == 'L' then
+	     getRightHandSide()[i] == getRowUpper()[i]
+	<li> if getRowSense()[i] == 'G' then
+	     getRightHandSide()[i] == getRowLower()[i]
+	<li> if getRowSense()[i] == 'R' then
+	     getRightHandSide()[i] == getRowUpper()[i]
+	<li> if getRowSense()[i] == 'N' then
+	     getRightHandSide()[i] == 0.0
+      </ul>
+    */
+    virtual const double * getRightHandSide() const = 0;
+
+    /*! \brief Get a pointer to an array[getNumRows()] of row ranges.
+
+      <ul>
+	  <li> if getRowSense()[i] == 'R' then
+		  getRowRange()[i] == getRowUpper()[i] - getRowLower()[i]
+	  <li> if getRowSense()[i] != 'R' then
+		  getRowRange()[i] is 0.0
+	</ul>
+    */
+    virtual const double * getRowRange() const = 0;
+
+    /// Get a pointer to an array[getNumRows()] of row lower bounds
+    virtual const double * getRowLower() const = 0;
+
+    /// Get a pointer to an array[getNumRows()] of row upper bounds
+    virtual const double * getRowUpper() const = 0;
+
+    /*! \brief Get a pointer to an array[getNumCols()] of objective
+	       function coefficients.
+    */
+    virtual const double * getObjCoefficients() const = 0;
+
+    /*! \brief Get the objective function sense
+    
+      -  1 for minimisation (default)
+      - -1 for maximisation
+    */
+    virtual double getObjSense() const = 0;
+
+    /// Return true if the variable is continuous
+    virtual bool isContinuous(int colIndex) const = 0;
+
+    /// Return true if the variable is binary
+    virtual bool isBinary(int colIndex) const;
+
+    /*! \brief Return true if the variable is integer.
+
+      This method returns true if the variable is binary or general integer.
+    */
+    virtual bool isInteger(int colIndex) const;
+
+    /// Return true if the variable is general integer
+    virtual bool isIntegerNonBinary(int colIndex) const;
+
+    /// Return true if the variable is binary and not fixed
+    virtual bool isFreeBinary(int colIndex) const; 
+
+    /*! \brief Return an array[getNumCols()] of column types
+
+      \deprecated See #getColType
+    */
+    inline const char *columnType(bool refresh=false) const
+    { return getColType(refresh); }
+
+    /*! \brief Return an array[getNumCols()] of column types
+
+       - 0 - continuous
+       - 1 - binary
+       - 2 - general integer
+      
+      If \p refresh is true, the classification of integer variables as
+      binary or general integer will be reevaluated. If the current bounds
+      are [0,1], or if the variable is fixed at 0 or 1, it will be classified
+      as binary, otherwise it will be classified as general integer.
+    */
+    virtual const char * getColType(bool refresh=false) const;
+  
+    /// Get a pointer to a row-wise copy of the matrix
+    virtual const CoinPackedMatrix * getMatrixByRow() const = 0;
+
+    /// Get a pointer to a column-wise copy of the matrix
+    virtual const CoinPackedMatrix * getMatrixByCol() const = 0;
+
+    /*! \brief Get a pointer to a mutable row-wise copy of the matrix.
+    
+      Returns NULL if the request is not meaningful (i.e., the OSI will not
+      recognise any modifications to the matrix).
+    */
+    virtual CoinPackedMatrix * getMutableMatrixByRow() const {return NULL;}
+
+    /*! \brief Get a pointer to a mutable column-wise copy of the matrix
+    
+      Returns NULL if the request is not meaningful (i.e., the OSI will not
+      recognise any modifications to the matrix).
+    */
+    virtual CoinPackedMatrix * getMutableMatrixByCol() const {return NULL;}
+
+    /// Get the solver's value for infinity
+    virtual double getInfinity() const = 0;
+  //@}
+    
+  /**@name Solution query methods */
+  //@{
+    /// Get a pointer to an array[getNumCols()] of primal variable values
+    virtual const double * getColSolution() const = 0;
+
+    /** Get a pointer to an array[getNumCols()] of primal variable values
+	guaranteed to be between the column lower and upper bounds.
+    */
+    virtual const double * getStrictColSolution();
+
+    /// Get pointer to array[getNumRows()] of dual variable values
+    virtual const double * getRowPrice() const = 0;
+
+    /// Get a pointer to an array[getNumCols()] of reduced costs
+    virtual const double * getReducedCost() const = 0;
+
+    /** Get a pointer to array[getNumRows()] of row activity levels.
+    
+      The row activity for a row is the left-hand side evaluated at the
+      current solution.
+    */
+    virtual const double * getRowActivity() const = 0;
+
+    /// Get the objective function value.
+    virtual double getObjValue() const = 0;
+
+    /** Get the number of iterations it took to solve the problem (whatever
+	`iteration' means to the solver).
+    */
+    virtual int getIterationCount() const = 0;
+
+    /** Get as many dual rays as the solver can provide. In case of proven
+	primal infeasibility there should (with high probability) be at least
+	one.
+
+	The first getNumRows() ray components will always be associated with
+	the row duals (as returned by getRowPrice()). If \c fullRay is true,
+	the final getNumCols() entries will correspond to the ray components
+	associated with the nonbasic variables. If the full ray is requested
+	and the method cannot provide it, it will throw an exception.
+
+	\note
+	Implementors of solver interfaces note that the double pointers in
+	the vector should point to arrays of length getNumRows() (fullRay =
+	false) or (getNumRows()+getNumCols()) (fullRay = true) and they should
+	be allocated with new[].
+
+	\note
+	Clients of solver interfaces note that it is the client's
+	responsibility to free the double pointers in the vector using
+	delete[]. Clients are reminded that a problem can be dual and primal
+	infeasible.
+    */
+    virtual std::vector<double*> getDualRays(int maxNumRays,
+					     bool fullRay = false) const = 0;
+
+    /** Get as many primal rays as the solver can provide. In case of proven
+	dual infeasibility there should (with high probability) be at least
+	one.
+   
+	\note
+	Implementors of solver interfaces note that the double pointers in
+	the vector should point to arrays of length getNumCols() and they
+	should be allocated with new[].
+
+	\note
+	Clients of solver interfaces note that it is the client's
+	responsibility to free the double pointers in the vector using
+	delete[]. Clients are reminded that a problem can be dual and primal
+	infeasible.
+    */
+    virtual std::vector<double*> getPrimalRays(int maxNumRays) const = 0;
+
+    /** Get vector of indices of primal variables which are integer variables 
+	but have fractional values in the current solution. */
+    virtual OsiVectorInt getFractionalIndices(const double etol=1.e-05)
+      const;
+  //@}
+
+  //-------------------------------------------------------------------------
+  /**@name Methods to modify the objective, bounds, and solution
+
+     For functions which take a set of indices as parameters
+     (\c setObjCoeffSet(), \c setColSetBounds(), \c setRowSetBounds(),
+     \c setRowSetTypes()), the parameters follow the C++ STL iterator
+     convention: \c indexFirst points to the first index in the
+     set, and \c indexLast points to a position one past the last index
+     in the set.
+  
+  */
+  //@{
+    /** Set an objective function coefficient */
+    virtual void setObjCoeff( int elementIndex, double elementValue ) = 0;
+
+    /** Set a set of objective function coefficients */
+    virtual void setObjCoeffSet(const int* indexFirst,
+				const int* indexLast,
+				const double* coeffList);
+
+    /** Set the objective coefficients for all columns.
+
+	array [getNumCols()] is an array of values for the objective.
+	This defaults to a series of set operations and is here for speed.
+    */
+    virtual void setObjective(const double * array);
+
+    /** Set the objective function sense.
+
+        Use 1 for minimisation (default), -1 for maximisation.
+
+	\note
+	Implementors note that objective function sense is a parameter of
+	the OSI, not a property of the problem. Objective sense can be
+	set prior to problem load and should not be affected by loading a
+	new problem.
+    */
+    virtual void setObjSense(double s) = 0;
+  
+
+    /** Set a single column lower bound.
+	Use -getInfinity() for -infinity. */
+    virtual void setColLower( int elementIndex, double elementValue ) = 0;
+    
+    /** Set the lower bounds for all columns.
+
+	array [getNumCols()] is an array of values for the lower bounds.
+	This defaults to a series of set operations and is here for speed.
+    */
+    virtual void setColLower(const double * array);
+
+    /** Set a single column upper bound.
+	Use getInfinity() for infinity. */
+    virtual void setColUpper( int elementIndex, double elementValue ) = 0;
+
+    /** Set the upper bounds for all columns.
+
+	array [getNumCols()] is an array of values for the upper bounds.
+	This defaults to a series of set operations and is here for speed.
+    */
+    virtual void setColUpper(const double * array);
+    
+    
+    /** Set a single column lower and upper bound.
+	The default implementation just invokes setColLower() and
+	setColUpper() */
+    virtual void setColBounds( int elementIndex,
+			       double lower, double upper ) {
+       setColLower(elementIndex, lower);
+       setColUpper(elementIndex, upper);
+    }
+  
+    /** Set the upper and lower bounds of a set of columns.
+
+	The default implementation just invokes setColBounds() over and over
+	again.  For each column, boundList must contain both a lower and
+	upper bound, in that order.
+    */
+    virtual void setColSetBounds(const int* indexFirst,
+				 const int* indexLast,
+				 const double* boundList);
+
+    /** Set a single row lower bound.
+	Use -getInfinity() for -infinity. */
+    virtual void setRowLower( int elementIndex, double elementValue ) = 0;
+    
+    /** Set a single row upper bound.
+	Use getInfinity() for infinity. */
+    virtual void setRowUpper( int elementIndex, double elementValue ) = 0;
+  
+    /** Set a single row lower and upper bound.
+	The default implementation just invokes setRowLower() and
+	setRowUpper() */
+    virtual void setRowBounds( int elementIndex,
+			       double lower, double upper ) {
+       setRowLower(elementIndex, lower);
+       setRowUpper(elementIndex, upper);
+    }
+
+    /** Set the bounds on a set of rows.
+
+	The default implementation just invokes setRowBounds() over and over
+	again.  For each row, boundList must contain both a lower and
+	upper bound, in that order.
+    */
+    virtual void setRowSetBounds(const int* indexFirst,
+				 const int* indexLast,
+				 const double* boundList);
+  
+  
+    /** Set the type of a single row */
+    virtual void setRowType(int index, char sense, double rightHandSide,
+			    double range) = 0;
+  
+    /** Set the type of a set of rows.
+	The default implementation just invokes setRowType()
+	over and over again.
+    */
+    virtual void setRowSetTypes(const int* indexFirst,
+				const int* indexLast,
+				const char* senseList,
+				const double* rhsList,
+				const double* rangeList);
+
+    /** Set the primal solution variable values
+
+	colsol[getNumCols()] is an array of values for the primal variables.
+	These values are copied to memory owned by the solver interface
+	object or the solver.  They will be returned as the result of
+	getColSolution() until changed by another call to setColSolution() or
+	by a call to any solver routine.  Whether the solver makes use of the
+	solution in any way is solver-dependent.
+    */
+    virtual void setColSolution(const double *colsol) = 0;
+
+    /** Set dual solution variable values
+
+	rowprice[getNumRows()] is an array of values for the dual variables.
+	These values are copied to memory owned by the solver interface
+	object or the solver.  They will be returned as the result of
+	getRowPrice() until changed by another call to setRowPrice() or by a
+	call to any solver routine.  Whether the solver makes use of the
+	solution in any way is solver-dependent.
+    */
+    virtual void setRowPrice(const double * rowprice) = 0;
+
+    /** Fix variables at bound based on reduced cost
+    
+	For variables currently at bound, fix the variable at bound if the
+	reduced cost exceeds the gap. Return the number of variables fixed.
+
+	If justInteger is set to false, the routine will also fix continuous
+	variables, but the test still assumes a delta of 1.0.
+    */
+    virtual int reducedCostFix(double gap, bool justInteger=true);
+  //@}
+
+  //-------------------------------------------------------------------------
+  /**@name Methods to set variable type */
+  //@{
+    /** Set the index-th variable to be a continuous variable */
+    virtual void setContinuous(int index) = 0;
+    /** Set the index-th variable to be an integer variable */
+    virtual void setInteger(int index) = 0;
+    /** Set the variables listed in indices (which is of length len) to be
+	continuous variables */
+    virtual void setContinuous(const int* indices, int len);
+    /** Set the variables listed in indices (which is of length len) to be
+	integer variables */
+    virtual void setInteger(const int* indices, int len);
+  //@}
+  //-------------------------------------------------------------------------
+
+  //-------------------------------------------------------------------------
+
+    /*! \brief Data type for name vectors. */
+    typedef std::vector<std::string> OsiNameVec ;
+
+  /*! \name Methods for row and column names
+
+    Osi defines three name management disciplines: `auto names' (0), `lazy
+    names' (1), and `full names' (2). See the description of
+    #OsiNameDiscipline for details. Changing the name discipline (via
+    setIntParam()) will not automatically add or remove name information,
+    but setting the discipline to auto will make existing information
+    inaccessible until the discipline is reset to lazy or full.
+
+    By definition, a row index of getNumRows() (<i>i.e.</i>, one larger than
+    the largest valid row index) refers to the objective function.
+
+    OSI users and implementors: While the OSI base class can define an
+    interface and provide rudimentary support, use of names really depends
+    on support by the OsiXXX class to ensure that names are managed
+    correctly.  If an OsiXXX class does not support names, it should return
+    false for calls to getIntParam() or setIntParam() that reference
+    OsiNameDiscipline.
+  */
+  //@{
+
+    /*! \brief Generate a standard name of the form Rnnnnnnn or Cnnnnnnn
+    
+      Set \p rc to 'r' for a row name, 'c' for a column name.
+      The `nnnnnnn' part is generated from ndx and will contain 7 digits
+      by default, padded with zeros if necessary. As a special case,
+      ndx = getNumRows() is interpreted as a request for the name of the
+      objective function. OBJECTIVE is returned, truncated to digits+1
+      characters to match the row and column names.
+    */
+    virtual std::string dfltRowColName(char rc,
+				 int ndx, unsigned digits = 7) const ;
+
+    /*! \brief Return the name of the objective function */
+
+  virtual std::string getObjName (unsigned maxLen = static_cast<unsigned>(std::string::npos)) const ;
+
+    /*! \brief Set the name of the objective function */
+
+    virtual inline void setObjName (std::string name)
+    { objName_ = name ; }
+
+    /*! \brief Return the name of the row.
+
+      The routine will <i>always</i> return some name, regardless of the name
+      discipline or the level of support by an OsiXXX derived class. Use
+      maxLen to limit the length.
+    */
+    virtual std::string getRowName(int rowIndex,
+				   unsigned maxLen = static_cast<unsigned>(std::string::npos)) const ;
+
+    /*! \brief Return a pointer to a vector of row names
+
+      If the name discipline (#OsiNameDiscipline) is auto, the return value
+      will be a vector of length zero. If the name discipline is lazy, the
+      vector will contain only names supplied by the client and will be no
+      larger than needed to hold those names; entries not supplied will be
+      null strings. In particular, the objective name is <i>not</i>
+      included in the vector for lazy names. If the name discipline is
+      full, the vector will have getNumRows() names, either supplied or
+      generated, plus one additional entry for the objective name.
+    */
+    virtual const OsiNameVec &getRowNames() ;
+
+    /*! \brief Set a row name
+
+      Quietly does nothing if the name discipline (#OsiNameDiscipline) is
+      auto. Quietly fails if the row index is invalid.
+    */
+    virtual void setRowName(int ndx, std::string name) ;
+
+    /*! \brief Set multiple row names
+
+      The run of len entries starting at srcNames[srcStart] are installed as
+      row names starting at row index tgtStart. The base class implementation
+      makes repeated calls to setRowName.
+    */
+    virtual void setRowNames(OsiNameVec &srcNames,
+		     int srcStart, int len, int tgtStart) ;
+
+    /*! \brief Delete len row names starting at index tgtStart
+
+      The specified row names are removed and the remaining row names are
+      copied down to close the gap.
+    */
+    virtual void deleteRowNames(int tgtStart, int len) ;
+  
+    /*! \brief Return the name of the column
+
+      The routine will <i>always</i> return some name, regardless of the name
+      discipline or the level of support by an OsiXXX derived class. Use
+      maxLen to limit the length.
+    */
+    virtual std::string getColName(int colIndex,
+				   unsigned maxLen = static_cast<unsigned>(std::string::npos)) const ;
+
+    /*! \brief Return a pointer to a vector of column names
+
+      If the name discipline (#OsiNameDiscipline) is auto, the return value
+      will be a vector of length zero. If the name discipline is lazy, the
+      vector will contain only names supplied by the client and will be no
+      larger than needed to hold those names; entries not supplied will be
+      null strings. If the name discipline is full, the vector will have
+      getNumCols() names, either supplied or generated.
+    */
+    virtual const OsiNameVec &getColNames() ;
+
+    /*! \brief Set a column name
+
+      Quietly does nothing if the name discipline (#OsiNameDiscipline) is
+      auto. Quietly fails if the column index is invalid.
+    */
+    virtual void setColName(int ndx, std::string name) ;
+
+    /*! \brief Set multiple column names
+
+      The run of len entries starting at srcNames[srcStart] are installed as
+      column names starting at column index tgtStart. The base class
+      implementation makes repeated calls to setColName.
+    */
+    virtual void setColNames(OsiNameVec &srcNames,
+		     int srcStart, int len, int tgtStart) ;
+
+    /*! \brief Delete len column names starting at index tgtStart
+
+      The specified column names are removed and the remaining column names
+      are copied down to close the gap.
+    */
+    virtual void deleteColNames(int tgtStart, int len) ;
+  
+
+    /*! \brief Set row and column names from a CoinMpsIO object.
+    
+      Also sets the name of the objective function. If the name discipline
+      is auto, you get what you asked for. This routine does not use
+      setRowName or setColName.
+    */
+    void setRowColNames(const CoinMpsIO &mps) ;
+
+    /*! \brief Set row and column names from a CoinModel object.
+
+      If the name discipline is auto, you get what you asked for.
+      This routine does not use setRowName or setColName.
+    */
+    void setRowColNames(CoinModel &mod) ;
+
+    /*! \brief Set row and column names from a CoinLpIO object.
+
+      Also sets the name of the objective function. If the name discipline is
+      auto, you get what you asked for. This routine does not use setRowName
+      or setColName.
+    */
+    void setRowColNames(CoinLpIO &mod) ;
+
+  //@}
+  //-------------------------------------------------------------------------
+    
+  //-------------------------------------------------------------------------
+  /**@name Methods to modify the constraint system.
+
+     Note that new columns are added as continuous variables.
+  */
+  //@{
+
+    /** Add a column (primal variable) to the problem. */
+    virtual void addCol(const CoinPackedVectorBase& vec,
+			const double collb, const double colub,   
+			const double obj) = 0;
+
+    /*! \brief Add a named column (primal variable) to the problem.
+
+      The default implementation adds the column, then changes the name. This
+      can surely be made more efficient within an OsiXXX class.
+    */
+    virtual void addCol(const CoinPackedVectorBase& vec,
+			const double collb, const double colub,   
+			const double obj, std::string name) ;
+
+    /** Add a column (primal variable) to the problem. */
+    virtual void addCol(int numberElements,
+			const int* rows, const double* elements,
+			const double collb, const double colub,   
+			const double obj) ;
+
+    /*! \brief Add a named column (primal variable) to the problem.
+
+      The default implementation adds the column, then changes the name. This
+      can surely be made more efficient within an OsiXXX class.
+    */
+    virtual void addCol(int numberElements,
+			const int* rows, const double* elements,
+			const double collb, const double colub,   
+			const double obj, std::string name) ;
+
+    /** Add a set of columns (primal variables) to the problem.
+    
+      The default implementation simply makes repeated calls to
+      addCol().
+    */
+    virtual void addCols(const int numcols,
+			 const CoinPackedVectorBase * const * cols,
+			 const double* collb, const double* colub,   
+			 const double* obj);
+
+    /** Add a set of columns (primal variables) to the problem.
+    
+      The default implementation simply makes repeated calls to
+      addCol().
+    */
+    virtual void addCols(const int numcols, const int* columnStarts,
+			 const int* rows, const double* elements,
+			 const double* collb, const double* colub,   
+			 const double* obj);
+
+    /// Add columns using a CoinBuild object
+    void addCols(const CoinBuild & buildObject);
+
+    /** Add columns from a model object.  returns
+       -1 if object in bad state (i.e. has row information)
+       otherwise number of errors
+       modelObject non const as can be regularized as part of build
+    */
+    int addCols(CoinModel & modelObject);
+
+#if 0
+    /** */
+    virtual void addCols(const CoinPackedMatrix& matrix,
+			 const double* collb, const double* colub,   
+			 const double* obj);
+#endif
+
+    /** \brief Remove a set of columns (primal variables) from the
+	       problem.
+
+      The solver interface for a basis-oriented solver will maintain valid
+      warm start information if all deleted variables are nonbasic.
+    */
+    virtual void deleteCols(const int num, const int * colIndices) = 0;
+  
+    /*! \brief Add a row (constraint) to the problem. */
+    virtual void addRow(const CoinPackedVectorBase& vec,
+			const double rowlb, const double rowub) = 0;
+
+    /*! \brief Add a named row (constraint) to the problem.
+    
+      The default implementation adds the row, then changes the name. This
+      can surely be made more efficient within an OsiXXX class.
+    */
+    virtual void addRow(const CoinPackedVectorBase& vec,
+			const double rowlb, const double rowub,
+			std::string name) ;
+
+    /*! \brief Add a row (constraint) to the problem. */
+    virtual void addRow(const CoinPackedVectorBase& vec,
+			const char rowsen, const double rowrhs,   
+			const double rowrng) = 0;
+
+    /*! \brief Add a named row (constraint) to the problem.
+
+      The default implementation adds the row, then changes the name. This
+      can surely be made more efficient within an OsiXXX class.
+    */
+    virtual void addRow(const CoinPackedVectorBase& vec,
+			const char rowsen, const double rowrhs,   
+			const double rowrng, std::string name) ;
+
+    /*! Add a row (constraint) to the problem.
+    
+      Converts to addRow(CoinPackedVectorBase&,const double,const double).
+    */
+    virtual void addRow(int numberElements,
+			const int *columns, const double *element,
+			const double rowlb, const double rowub) ;
+
+    /*! Add a set of rows (constraints) to the problem.
+    
+      The default implementation simply makes repeated calls to
+      addRow().
+    */
+    virtual void addRows(const int numrows,
+			 const CoinPackedVectorBase * const * rows,
+			 const double* rowlb, const double* rowub);
+
+    /** Add a set of rows (constraints) to the problem.
+    
+      The default implementation simply makes repeated calls to
+      addRow().
+    */
+    virtual void addRows(const int numrows,
+			 const CoinPackedVectorBase * const * rows,
+			 const char* rowsen, const double* rowrhs,   
+			 const double* rowrng);
+
+    /** Add a set of rows (constraints) to the problem.
+    
+      The default implementation simply makes repeated calls to
+      addRow().
+    */
+    virtual void addRows(const int numrows, const int *rowStarts,
+			 const int *columns, const double *element,
+			 const double *rowlb, const double *rowub);
+
+    /// Add rows using a CoinBuild object
+    void addRows(const CoinBuild &buildObject);
+
+    /*! Add rows from a CoinModel object.
+    
+      Returns -1 if the object is in the wrong state (<i>i.e.</i>, has
+      column-major information), otherwise the number of errors.
+
+      The modelObject is not const as it can be regularized as part of
+      the build.
+    */
+    int addRows(CoinModel &modelObject);
+
+#if 0
+    /** */
+    virtual void addRows(const CoinPackedMatrix& matrix,
+			 const double* rowlb, const double* rowub);
+    /** */
+    virtual void addRows(const CoinPackedMatrix& matrix,
+			 const char* rowsen, const double* rowrhs,   
+			 const double* rowrng);
+#endif
+
+    /** \brief Delete a set of rows (constraints) from the problem.
+
+      The solver interface for a basis-oriented solver will maintain valid
+      warm start information if all deleted rows are loose.
+    */
+    virtual void deleteRows(const int num, const int * rowIndices) = 0;
+
+    /** \brief Replace the constraint matrix
+
+      I (JJF) am getting annoyed because I can't just replace a matrix.
+      The default behavior of this is do nothing so only use where that would
+      not matter, e.g. strengthening a matrix for MIP.
+    */
+    virtual void replaceMatrixOptional(const CoinPackedMatrix & ) {}
+
+    /** \brief Replace the constraint matrix
+    
+      And if it does matter (not used at present)
+    */
+    virtual void replaceMatrix(const CoinPackedMatrix & ) {abort();}
+
+    /** \brief Save a copy of the base model
+    
+      If solver wants it can save a copy of "base" (continuous) model here.
+    */
+    virtual void saveBaseModel() {}
+
+    /** \brief Reduce the constraint system to the specified number of
+    	       constraints.
+
+       If solver wants it can restore a copy of "base" (continuous) model
+       here.
+
+       \note
+       The name is somewhat misleading. Implementors should consider
+       the opportunity to optimise behaviour in the common case where
+       \p numberRows is exactly the number of original constraints. Do not,
+       however, neglect the possibility that \p numberRows does not equal
+       the number of original constraints.
+     */
+    virtual void restoreBaseModel(int numberRows);
+    //-----------------------------------------------------------------------
+    /** Apply a collection of cuts.
+
+	Only cuts which have an <code>effectiveness >= effectivenessLb</code>
+	are applied.
+	<ul>
+	  <li> ReturnCode.getNumineffective() -- number of cuts which were
+	       not applied because they had an
+	       <code>effectiveness < effectivenessLb</code>
+	  <li> ReturnCode.getNuminconsistent() -- number of invalid cuts
+	  <li> ReturnCode.getNuminconsistentWrtIntegerModel() -- number of
+	       cuts that are invalid with respect to this integer model
+	  <li> ReturnCode.getNuminfeasible() -- number of cuts that would
+	       make this integer model infeasible
+	  <li> ReturnCode.getNumApplied() -- number of integer cuts which
+	       were applied to the integer model
+	  <li> cs.size() == getNumineffective() +
+			    getNuminconsistent() +
+			    getNuminconsistentWrtIntegerModel() +
+			    getNuminfeasible() +
+			    getNumApplied()
+	</ul>
+    */
+    virtual ApplyCutsReturnCode applyCuts(const OsiCuts & cs,
+					  double effectivenessLb = 0.0);
+
+    /** Apply a collection of row cuts which are all effective.
+	applyCuts seems to do one at a time which seems inefficient.
+	Would be even more efficient to pass an array of pointers.
+    */
+    virtual void applyRowCuts(int numberCuts, const OsiRowCut * cuts);
+
+    /** Apply a collection of row cuts which are all effective.
+	This is passed in as an array of pointers.
+    */
+    virtual void applyRowCuts(int numberCuts, const OsiRowCut ** cuts);
+
+    /// Deletes branching information before columns deleted
+    void deleteBranchingInfo(int numberDeleted, const int * which);
+
+  //@}
+
+  //---------------------------------------------------------------------------
+
+  /**@name Methods for problem input and output */
+  //@{
+    /*! \brief Load in a problem by copying the arguments. The constraints on
+	    the rows are given by lower and upper bounds.
+	
+	If a pointer is 0 then the following values are the default:
+        <ul>
+          <li> <code>colub</code>: all columns have upper bound infinity
+          <li> <code>collb</code>: all columns have lower bound 0 
+          <li> <code>rowub</code>: all rows have upper bound infinity
+          <li> <code>rowlb</code>: all rows have lower bound -infinity
+	  <li> <code>obj</code>: all variables have 0 objective coefficient
+        </ul>
+
+	Note that the default values for rowub and rowlb produce the
+	constraint -infty <= ax <= infty. This is probably not what you want.
+    */
+    virtual void loadProblem (const CoinPackedMatrix& matrix,
+			      const double* collb, const double* colub,   
+			      const double* obj,
+			      const double* rowlb, const double* rowub) = 0;
+			    
+    /*! \brief Load in a problem by assuming ownership of the arguments.
+	    The constraints on the rows are given by lower and upper bounds.
+
+	For default argument values see the matching loadProblem method.
+
+	\warning
+	The arguments passed to this method will be freed using the
+	C++ <code>delete</code> and <code>delete[]</code> functions. 
+    */
+    virtual void assignProblem (CoinPackedMatrix*& matrix,
+			        double*& collb, double*& colub, double*& obj,
+			        double*& rowlb, double*& rowub) = 0;
+
+    /*! \brief Load in a problem by copying the arguments.
+	    The constraints on the rows are given by sense/rhs/range triplets.
+	    
+	If a pointer is 0 then the following values are the default:
+	<ul>
+          <li> <code>colub</code>: all columns have upper bound infinity
+          <li> <code>collb</code>: all columns have lower bound 0 
+	  <li> <code>obj</code>: all variables have 0 objective coefficient
+          <li> <code>rowsen</code>: all rows are >=
+          <li> <code>rowrhs</code>: all right hand sides are 0
+          <li> <code>rowrng</code>: 0 for the ranged rows
+        </ul>
+
+	Note that the default values for rowsen, rowrhs, and rowrng produce the
+	constraint ax >= 0.
+    */
+    virtual void loadProblem (const CoinPackedMatrix& matrix,
+			      const double* collb, const double* colub,
+			      const double* obj,
+			      const char* rowsen, const double* rowrhs,   
+			      const double* rowrng) = 0;
+
+    /*! \brief Load in a problem by assuming ownership of the arguments.
+	    The constraints on the rows are given by sense/rhs/range triplets.
+	
+	For default argument values see the matching loadProblem method.
+
+	\warning
+	The arguments passed to this method will be freed using the
+	C++ <code>delete</code> and <code>delete[]</code> functions. 
+    */
+    virtual void assignProblem (CoinPackedMatrix*& matrix,
+			        double*& collb, double*& colub, double*& obj,
+			        char*& rowsen, double*& rowrhs,
+			        double*& rowrng) = 0;
+
+    /*! \brief Load in a problem by copying the arguments. The constraint
+	    matrix is is specified with standard column-major
+	    column starts / row indices / coefficients vectors. 
+	    The constraints on the rows are given by lower and upper bounds.
+    
+      The matrix vectors must be gap-free. Note that <code>start</code> must
+      have <code>numcols+1</code> entries so that the length of the last column
+      can be calculated as <code>start[numcols]-start[numcols-1]</code>.
+
+      See the previous loadProblem method using rowlb and rowub for default
+      argument values.
+    */
+    virtual void loadProblem (const int numcols, const int numrows,
+			      const CoinBigIndex * start, const int* index,
+			      const double* value,
+			      const double* collb, const double* colub,   
+			      const double* obj,
+			      const double* rowlb, const double* rowub) = 0;
+
+    /*! \brief Load in a problem by copying the arguments. The constraint
+	    matrix is is specified with standard column-major
+	    column starts / row indices / coefficients vectors. 
+	    The constraints on the rows are given by sense/rhs/range triplets.
+    
+      The matrix vectors must be gap-free. Note that <code>start</code> must
+      have <code>numcols+1</code> entries so that the length of the last column
+      can be calculated as <code>start[numcols]-start[numcols-1]</code>.
+
+      See the previous loadProblem method using sense/rhs/range for default
+      argument values.
+    */
+    virtual void loadProblem (const int numcols, const int numrows,
+			      const CoinBigIndex * start, const int* index,
+			      const double* value,
+			      const double* collb, const double* colub,   
+			      const double* obj,
+			      const char* rowsen, const double* rowrhs,   
+  			      const double* rowrng) = 0;
+
+    /*! \brief Load a model from a CoinModel object. Return the number of
+	    errors encountered.
+
+      The modelObject parameter cannot be const as it may be changed as part
+      of process. If keepSolution is true will try and keep warmStart.
+    */
+    virtual int loadFromCoinModel (CoinModel & modelObject,
+				   bool keepSolution=false);
+
+    /*! \brief Read a problem in MPS format from the given filename.
+    
+      The default implementation uses CoinMpsIO::readMps() to read
+      the MPS file and returns the number of errors encountered.
+    */
+    virtual int readMps (const char *filename,
+			 const char *extension = "mps") ;
+
+    /*! \brief Read a problem in MPS format from the given full filename.
+    
+      This uses CoinMpsIO::readMps() to read the MPS file and returns the
+      number of errors encountered. It also may return an array of set
+      information
+    */
+    virtual int readMps (const char *filename, const char*extension,
+			int & numberSets, CoinSet ** & sets);
+
+    /*! \brief Read a problem in GMPL format from the given filenames.
+    
+      The default implementation uses CoinMpsIO::readGMPL(). This capability
+      is available only if the third-party package Glpk is installed.
+    */
+    virtual int readGMPL (const char *filename, const char *dataname=NULL);
+
+    /*! \brief Write the problem in MPS format to the specified file.
+
+      If objSense is non-zero, a value of -1.0 causes the problem to be
+      written with a maximization objective; +1.0 forces a minimization
+      objective. If objSense is zero, the choice is left to the implementation.
+    */
+    virtual void writeMps (const char *filename,
+			   const char *extension = "mps",
+			   double objSense=0.0) const = 0;
+
+    /*! \brief Write the problem in MPS format to the specified file with
+	    more control over the output.
+
+	Row and column names may be null.
+	formatType is
+	<ul>
+	  <li> 0 - normal
+	  <li> 1 - extra accuracy 
+	  <li> 2 - IEEE hex
+	</ul>
+
+	Returns non-zero on I/O error
+    */
+    int writeMpsNative (const char *filename, 
+		        const char ** rowNames, const char ** columnNames,
+		        int formatType=0,int numberAcross=2,
+		        double objSense=0.0, int numberSOS=0,
+		        const CoinSet * setInfo=NULL) const ;
+
+/***********************************************************************/
+// Lp files 
+
+  /** Write the problem into an Lp file of the given filename with the 
+      specified extension.
+      Coefficients with value less than epsilon away from an integer value
+      are written as integers.
+      Write at most numberAcross monomials on a line.
+      Write non integer numbers with decimals digits after the decimal point.
+
+      The written problem is always a minimization problem.
+      If the current problem is a maximization problem, the 
+      intended objective function for the written problem is the current
+      objective function multiplied by -1. If the current problem is a
+      minimization problem, the intended objective function for the
+      written problem is the current objective function.
+      If objSense < 0, the intended objective function is multiplied by -1
+      before writing the problem. It is left unchanged otherwise.
+
+      Write objective function name and constraint names if useRowNames is 
+      true. This version calls writeLpNative().
+  */
+  virtual void writeLp(const char *filename,
+               const char *extension = "lp",
+                double epsilon = 1e-5,
+                int numberAcross = 10,
+                int decimals = 5,
+                double objSense = 0.0,
+	        bool useRowNames = true) const;
+
+  /** Write the problem into the file pointed to by the parameter fp. 
+      Other parameters are similar to 
+      those of writeLp() with first parameter filename.
+  */
+  virtual void writeLp(FILE *fp,
+                double epsilon = 1e-5,
+                int numberAcross = 10,
+                int decimals = 5,
+                double objSense = 0.0,
+	        bool useRowNames = true) const;
+
+  /** Write the problem into an Lp file. Parameters are similar to 
+      those of writeLp(), but in addition row names and column names
+      may be given. 
+
+      Parameter rowNames may be NULL, in which case default row names 
+      are used. If rowNames is not NULL, it must have exactly one entry
+      per row in the problem and one additional
+      entry (rowNames[getNumRows()] with the objective function name.
+      These getNumRows()+1 entries must be distinct. If this is not the 
+      case, default row names
+      are used. In addition, format restrictions are imposed on names
+      (see CoinLpIO::is_invalid_name() for details).
+
+      Similar remarks can be made for the parameter columnNames which
+      must either be NULL or have exactly getNumCols() distinct entries.
+
+      Write objective function name and constraint names if 
+      useRowNames is true. */
+  int writeLpNative(const char *filename,
+		    char const * const * const rowNames,
+		    char const * const * const columnNames,
+		    const double epsilon = 1.0e-5,
+                    const int numberAcross = 10,
+                    const int decimals = 5,
+                    const double objSense = 0.0,
+		    const bool useRowNames = true) const;
+
+  /** Write the problem into the file pointed to by the parameter fp. 
+      Other parameters are similar to 
+      those of writeLpNative() with first parameter filename.
+  */
+  int writeLpNative(FILE *fp,
+		    char const * const * const rowNames,
+		    char const * const * const columnNames,
+		    const double epsilon = 1.0e-5,
+                    const int numberAcross = 10,
+                    const int decimals = 5,
+                    const double objSense = 0.0,
+		    const bool useRowNames = true) const;
+
+  /// Read file in LP format from file with name filename. 
+  /// See class CoinLpIO for description of this format.
+  virtual int readLp(const char *filename, const double epsilon = 1e-5);
+
+  /// Read file in LP format from the file pointed to by fp. 
+  /// See class CoinLpIO for description of this format.
+  int readLp(FILE *fp, const double epsilon = 1e-5);
+
+  //@}
+
+  //---------------------------------------------------------------------------
+
+  /**@name Miscellaneous */
+  //@{
+  /** Check two models against each other.  Return nonzero if different.
+      Ignore names if that set.
+      (Note initial version does not check names)
+      May modify both models by cleaning up
+  */
+  int differentModel(OsiSolverInterface & other, 
+		     bool ignoreNames=true);
+#ifdef COIN_SNAPSHOT
+  /// Return a CoinSnapshot
+  virtual CoinSnapshot * snapshot(bool createArrays=true) const;
+#endif
+#ifdef COIN_FACTORIZATION_INFO
+  /// Return number of entries in L part of current factorization
+  virtual CoinBigIndex getSizeL() const;
+  /// Return number of entries in U part of current factorization
+  virtual CoinBigIndex getSizeU() const;
+#endif
+  //@}
+
+  //---------------------------------------------------------------------------
+
+  /**@name Setting/Accessing application data */
+  //@{
+    /** Set application data.
+
+	This is a pointer that the application can store into and
+	retrieve from the solver interface.
+	This field is available for the application to optionally
+	define and use.
+    */
+    void setApplicationData (void * appData);
+    /** Create a clone of an Auxiliary Information object.
+        The base class just stores an application data pointer
+        but can be more general.  Application data pointer is
+        designed for one user while this can be extended to cope
+        with more general extensions.
+    */
+    void setAuxiliaryInfo(OsiAuxInfo * auxiliaryInfo);
+
+    /// Get application data
+    void * getApplicationData() const;
+    /// Get pointer to auxiliary info object
+    OsiAuxInfo * getAuxiliaryInfo() const;
+  //@}
+  //---------------------------------------------------------------------------
+
+  /**@name Message handling
+  
+    See the COIN library documentation for additional information about
+    COIN message facilities.
+  
+  */
+  //@{
+  /** Pass in a message handler
+  
+    It is the client's responsibility to destroy a message handler installed
+    by this routine; it will not be destroyed when the solver interface is
+    destroyed. 
+  */
+  virtual void passInMessageHandler(CoinMessageHandler * handler);
+  /// Set language
+  void newLanguage(CoinMessages::Language language);
+  inline void setLanguage(CoinMessages::Language language)
+  {newLanguage(language);}
+  /// Return a pointer to the current message handler
+  inline CoinMessageHandler * messageHandler() const
+  {return handler_;}
+  /// Return the current set of messages
+  inline CoinMessages messages() 
+  {return messages_;}
+  /// Return a pointer to the current set of messages
+  inline CoinMessages * messagesPointer() 
+  {return &messages_;}
+  /// Return true if default handler
+  inline bool defaultHandler() const
+  { return defaultHandler_;}
+  //@}
+  //---------------------------------------------------------------------------
+  /**@name Methods for dealing with discontinuities other than integers.
+  
+     Osi should be able to know about SOS and other types.  This is an optional
+     section where such information can be stored.
+
+  */
+  //@{
+    /** \brief Identify integer variables and create corresponding objects.
+  
+      Record integer variables and create an OsiSimpleInteger object for each
+      one.  All existing OsiSimpleInteger objects will be destroyed.
+      If justCount then no objects created and we just store numberIntegers_
+    */
+
+    void findIntegers(bool justCount);
+    /** \brief Identify integer variables and SOS and create corresponding objects.
+  
+      Record integer variables and create an OsiSimpleInteger object for each
+      one.  All existing OsiSimpleInteger objects will be destroyed.
+      If the solver supports SOS then do the same for SOS.
+
+      If justCount then no objects created and we just store numberIntegers_
+      Returns number of SOS
+    */
+
+    virtual int findIntegersAndSOS(bool justCount);
+    /// Get the number of objects
+    inline int numberObjects() const { return numberObjects_;}
+    /// Set the number of objects
+    inline void setNumberObjects(int number) 
+    {  numberObjects_=number;}
+
+    /// Get the array of objects
+    inline OsiObject ** objects() const { return object_;}
+
+    /// Get the specified object
+    const inline OsiObject * object(int which) const { return object_[which];}
+    /// Get the specified object
+    inline OsiObject * modifiableObject(int which) const { return object_[which];}
+
+    /// Delete all object information
+    void deleteObjects();
+
+    /** Add in object information.
+  
+      Objects are cloned; the owner can delete the originals.
+    */
+    void addObjects(int numberObjects, OsiObject ** objects);
+    /** Use current solution to set bounds so current integer feasible solution will stay feasible.
+        Only feasible bounds will be used, even if current solution outside bounds.  The amount of
+        such violation will be returned (and if small can be ignored)
+    */
+    double forceFeasible();
+  //@}
+  //---------------------------------------------------------------------------
+
+  /*! @name Methods related to testing generated cuts
+  
+    See the documentation for OsiRowCutDebugger for additional details.
+  */
+  //@{
+    /*! \brief Activate the row cut debugger.
+
+      If \p modelName is in the set of known models then all cuts are
+      checked to see that they do NOT cut off the optimal solution known
+      to the debugger.
+    */
+    virtual void activateRowCutDebugger (const char *modelName);
+
+    /*! \brief Activate the row cut debugger using a full solution array.
+
+
+      Activate the debugger for a model not included in the debugger's
+      internal database.  Cuts will be checked to see that they do NOT
+      cut off the given solution.
+
+      \p solution must be a full solution vector, but only the integer
+      variables need to be correct. The debugger will fill in the continuous
+      variables by solving an lp relaxation with the integer variables
+      fixed as specified. If the given values for the continuous variables
+      should be preserved, set \p keepContinuous to true.
+    */
+    virtual void activateRowCutDebugger(const double *solution,
+    					bool enforceOptimality = true);
+
+    /*! \brief Get the row cut debugger provided the solution known to the
+    	       debugger is within the feasible region held in the solver.
+
+      If there is a row cut debugger object associated with model AND if
+      the solution known to the debugger is within the solver's current
+      feasible region (i.e., the column bounds held in the solver are
+      compatible with the known solution) then a pointer to the debugger
+      is returned which may be used to test validity of cuts.
+
+      Otherwise NULL is returned
+    */
+    const OsiRowCutDebugger *getRowCutDebugger() const;
+
+    /*! \brief Get the row cut debugger object
+
+      Return the row cut debugger object if it exists. One common usage of
+      this method is to obtain a debugger object in order to execute
+      OsiRowCutDebugger::redoSolution (so that the stored solution is again
+      compatible with the problem held in the solver).
+    */
+    OsiRowCutDebugger * getRowCutDebuggerAlways() const;
+  //@} 
+  
+  /*! \name OsiSimplexInterface
+      \brief Simplex Interface
+
+    Methods for an advanced interface to a simplex solver. The interface
+    comprises two groups of methods. Group 1 contains methods for tableau
+    access. Group 2 contains methods for dictating individual simplex pivots.
+  */
+  //@{
+
+  /*! \brief Return the simplex implementation level.
+  
+      The return codes are:
+      - 0: the simplex interface is not implemented.
+      - 1: the Group 1 (tableau access) methods are implemented.
+      - 2: the Group 2 (pivoting) methods are implemented
+
+      The codes are cumulative - a solver which implements Group 2 also
+      implements Group 1.
+  */
+  virtual int canDoSimplexInterface() const ;
+  //@}
+
+  /*! \name OsiSimplex Group 1
+      \brief Tableau access methods.
+
+      This group of methods provides access to rows and columns of the basis
+      inverse and to rows and columns of the tableau.
+  */
+  //@{
+
+  /*! \brief Prepare the solver for the use of tableau access methods.
+  
+    Prepares the solver for the use of the tableau access methods, if
+    any such preparation is required.
+
+    The \c const attribute is required due to the places this method
+    may be called (e.g., within CglCutGenerator::generateCuts()).
+  */
+  virtual void enableFactorization() const ;
+
+  /*! \brief Undo the effects of #enableFactorization. */
+  virtual void disableFactorization() const ;
+
+  /*! \brief Check if an optimal basis is available.
+  
+    Returns true if the problem has been solved to optimality and a
+    basis is available. This should be used to see if the tableau access
+    operations are possible and meaningful.
+    
+    \note
+    Implementors please note that this method may be called
+    before #enableFactorization.
+  */
+  virtual bool basisIsAvailable() const ;
+
+  /// Synonym for #basisIsAvailable
+  inline bool optimalBasisIsAvailable() const { return basisIsAvailable() ; }
+
+  /*! \brief Retrieve status information for column and row variables.
+ 
+    This method returns status as integer codes:
+    <ul>
+      <li> 0: free
+      <li> 1: basic
+      <li> 2: nonbasic at upper bound
+      <li> 3: nonbasic at lower bound
+    </ul>
+
+    The #getWarmStart method provides essentially the same functionality
+    for a simplex-oriented solver, but the implementation details are very
+    different.
+
+    \note
+    Logical variables associated with rows are all assumed to have +1
+    coefficients, so for a <= constraint the logical will be at lower
+    bound if the constraint is tight.
+
+    \note
+    Implementors may choose to implement this method as a wrapper which
+    converts a CoinWarmStartBasis to the requested representation.
+  */
+  virtual void getBasisStatus(int* cstat, int* rstat) const ;
+
+  /*! \brief Set the status of column and row variables and update
+             the basis factorization and solution.
+
+    Status information should be coded as documented for #getBasisStatus.
+    Returns 0 if all goes well, 1 if something goes wrong.
+
+    This method differs from #setWarmStart in the format of the input
+    and in its immediate effect. Think of it as #setWarmStart immediately
+    followed by #resolve, but no pivots are allowed.
+
+    \note
+    Implementors may choose to implement this method as a wrapper that calls
+    #setWarmStart and #resolve if the no pivot requirement can be satisfied.
+  */
+  virtual int setBasisStatus(const int* cstat, const int* rstat) ;
+
+  /*! \brief Calculate duals and reduced costs for the given objective
+	     coefficients.
+
+    The solver's objective coefficient vector is not changed.
+  */
+  virtual void getReducedGradient(double* columnReducedCosts, 
+				  double* duals, const double* c) const ;
+
+  /*! \brief Get a row of the tableau
+  
+    If \p slack is not null, it will be loaded with the coefficients for
+    the artificial (logical) variables (i.e., the row of the basis inverse).
+  */
+  virtual void getBInvARow(int row, double* z, double* slack = NULL) const ;
+
+  /*! \brief Get a row of the basis inverse */
+  virtual void getBInvRow(int row, double* z) const ;
+
+  /*! \brief Get a column of the tableau */
+  virtual void getBInvACol(int col, double* vec) const ;
+
+  /*! \brief Get a column of the basis inverse */
+  virtual void getBInvCol(int col, double* vec) const ;
+
+  /*! \brief Get indices of basic variables
+  
+    If the logical (artificial) for row i is basic, the index should be coded
+    as (#getNumCols + i).
+    The order of indices must match the order of elements in the vectors
+    returned by #getBInvACol and #getBInvCol.
+  */
+  virtual void getBasics(int* index) const ;
+
+  //@}
+
+  /*! \name OsiSimplex Group 2
+      \brief Pivoting methods
+
+      This group of methods provides for control of individual pivots by a
+      simplex solver.
+  */
+  //@{
+
+  /**Enables normal operation of subsequent functions.
+     This method is supposed to ensure that all typical things (like
+     reduced costs, etc.) are updated when individual pivots are executed
+     and can be queried by other methods.  says whether will be
+     doing primal or dual
+  */
+  virtual void enableSimplexInterface(bool doingPrimal) ;
+
+  ///Undo whatever setting changes the above method had to make
+  virtual void disableSimplexInterface() ;
+  /** Perform a pivot by substituting a colIn for colOut in the basis. 
+     The status of the leaving variable is given in outStatus. Where
+     1 is to upper bound, -1 to lower bound
+     Return code was undefined - now for OsiClp is 0 for okay,
+     1 if inaccuracy forced re-factorization (should be okay) and
+     -1 for singular factorization
+  */
+  virtual int pivot(int colIn, int colOut, int outStatus) ;
+
+  /** Obtain a result of the primal pivot 
+      Outputs: colOut -- leaving column, outStatus -- its status,
+      t -- step size, and, if dx!=NULL, *dx -- primal ray direction.
+      Inputs: colIn -- entering column, sign -- direction of its change (+/-1).
+      Both for colIn and colOut, artificial variables are index by
+      the negative of the row index minus 1.
+      Return code (for now): 0 -- leaving variable found, 
+      -1 -- everything else?
+      Clearly, more informative set of return values is required 
+      Primal and dual solutions are updated
+  */
+  virtual int primalPivotResult(int colIn, int sign, 
+				int& colOut, int& outStatus, 
+				double& t, CoinPackedVector* dx);
+
+  /** Obtain a result of the dual pivot (similar to the previous method)
+      Differences: entering variable and a sign of its change are now
+      the outputs, the leaving variable and its statuts -- the inputs
+      If dx!=NULL, then *dx contains dual ray
+      Return code: same
+  */
+  virtual int dualPivotResult(int& colIn, int& sign, 
+			      int colOut, int outStatus, 
+			      double& t, CoinPackedVector* dx) ;
+  //@}
+   
+  //---------------------------------------------------------------------------
+
+  ///@name Constructors and destructors
+  //@{
+    /// Default Constructor
+    OsiSolverInterface(); 
+    
+    /** Clone
+
+      The result of calling clone(false) is defined to be equivalent to
+      calling the default constructor OsiSolverInterface().
+    */
+    virtual OsiSolverInterface * clone(bool copyData = true) const = 0;
+  
+    /// Copy constructor 
+    OsiSolverInterface(const OsiSolverInterface &);
+  
+    /// Assignment operator 
+    OsiSolverInterface & operator=(const OsiSolverInterface& rhs);
+  
+    /// Destructor 
+    virtual ~OsiSolverInterface ();
+
+    /** Reset the solver interface.
+
+    A call to reset() returns the solver interface to the same state as
+    it would have if it had just been constructed by calling the default
+    constructor OsiSolverInterface().
+    */
+    virtual void reset();
+  //@}
+
+  //---------------------------------------------------------------------------
+
+protected:
+  ///@name Protected methods
+  //@{
+    /** Apply a row cut (append to the constraint matrix). */
+    virtual void applyRowCut( const OsiRowCut & rc ) = 0;
+
+    /** Apply a column cut (adjust the bounds of one or more variables). */
+    virtual void applyColCut( const OsiColCut & cc ) = 0;
+
+    /** A quick inlined function to convert from the lb/ub style of
+	constraint definition to the sense/rhs/range style */
+    inline void
+    convertBoundToSense(const double lower, const double upper,
+			char& sense, double& right, double& range) const;
+    /** A quick inlined function to convert from the sense/rhs/range style
+	of constraint definition to the lb/ub style */
+    inline void
+    convertSenseToBound(const char sense, const double right,
+			const double range,
+			double& lower, double& upper) const;
+    /** A quick inlined function to force a value to be between a minimum and
+	a maximum value */
+    template <class T> inline T
+    forceIntoRange(const T value, const T lower, const T upper) const {
+      return value < lower ? lower : (value > upper ? upper : value);
+    }
+    /** Set OsiSolverInterface object state for default constructor
+
+      This routine establishes the initial values of data fields in the
+      OsiSolverInterface object when the object is created using the
+      default constructor.
+    */
+    void setInitialData();
+  //@}
+
+  ///@name Protected member data
+  //@{
+    /*! \brief Pointer to row cut debugger object
+
+      Mutable so that we can update the solution held in the debugger while
+      maintaining const'ness for the Osi object.
+    */
+    mutable OsiRowCutDebugger * rowCutDebugger_;
+   // Why not just make useful stuff protected?
+   /// Message handler
+  CoinMessageHandler * handler_;
+  /** Flag to say if the currrent handler is the default handler.
+      Indicates if the solver interface object is responsible
+      for destruction of the handler (true) or if the client is
+      responsible (false).
+  */
+  bool defaultHandler_;
+  /// Messages
+  CoinMessages messages_;
+  /// Number of integers
+  int numberIntegers_;
+  /// Total number of objects
+  int numberObjects_;
+
+  /// Integer and ... information (integer info normally at beginning)
+  OsiObject ** object_;
+  /** Column type
+      0 - continuous
+      1 - binary (may get fixed later)
+      2 - general integer (may get fixed later)
+  */
+  mutable char * columnType_;
+
+  //@}
+  
+  //---------------------------------------------------------------------------
+
+private:
+  ///@name Private member data 
+  //@{
+    /// Pointer to user-defined data structure - and more if user wants
+    OsiAuxInfo * appDataEtc_;
+    /// Array of integer parameters
+    int intParam_[OsiLastIntParam];
+    /// Array of double parameters
+    double dblParam_[OsiLastDblParam];
+    /// Array of string parameters
+    std::string strParam_[OsiLastStrParam];
+    /// Array of hint parameters
+    bool hintParam_[OsiLastHintParam];
+    /// Array of hint strengths
+    OsiHintStrength hintStrength_[OsiLastHintParam];
+    /** Warm start information used for hot starts when the default
+       hot start implementation is used. */
+    CoinWarmStart* ws_;
+    /// Column solution satisfying lower and upper column bounds
+    std::vector<double> strictColSolution_;
+
+    /// Row names
+    OsiNameVec rowNames_ ;
+    /// Column names
+    OsiNameVec colNames_ ;
+    /// Objective name
+    std::string objName_ ;
+
+ //@}
+};
+
+//#############################################################################
+/** A quick inlined function to convert from the lb/ub style of constraint
+    definition to the sense/rhs/range style */
+inline void
+OsiSolverInterface::convertBoundToSense(const double lower, const double upper,
+					char& sense, double& right,
+					double& range) const
+{
+  double inf = getInfinity();
+  range = 0.0;
+  if (lower > -inf) {
+    if (upper < inf) {
+      right = upper;
+      if (upper==lower) {
+        sense = 'E';
+      } else {
+        sense = 'R';
+        range = upper - lower;
+      }
+    } else {
+      sense = 'G';
+      right = lower;
+    }
+  } else {
+    if (upper < inf) {
+      sense = 'L';
+      right = upper;
+    } else {
+      sense = 'N';
+      right = 0.0;
+    }
+  }
+}
+
+//-----------------------------------------------------------------------------
+/** A quick inlined function to convert from the sense/rhs/range style of
+    constraint definition to the lb/ub style */
+inline void
+OsiSolverInterface::convertSenseToBound(const char sense, const double right,
+					const double range,
+					double& lower, double& upper) const
+{
+  double inf=getInfinity();
+  switch (sense) {
+  case 'E':
+    lower = upper = right;
+    break;
+  case 'L':
+    lower = -inf;
+    upper = right;
+    break;
+  case 'G':
+    lower = right;
+    upper = inf;
+    break;
+  case 'R':
+    lower = right - range;
+    upper = right;
+    break;
+  case 'N':
+    lower = -inf;
+    upper = inf;
+    break;
+  }
+}
+
+#endif