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+/* $Id: CoinPresolvePsdebug.hpp 1560 2012-11-24 00:29:01Z lou $ */
+// Copyright (C) 2002, International Business Machines
+// Corporation and others.  All Rights Reserved.
+// This code is licensed under the terms of the Eclipse Public License (EPL).
+
+#ifndef CoinPresolvePsdebug_H
+#define CoinPresolvePsdebug_H
+
+/*
+  The current idea of the relation between PRESOLVE_DEBUG and
+  PRESOLVE_CONSISTENCY is that PRESOLVE_CONSISTENCY triggers the consistency
+  checks and PRESOLVE_DEBUG triggers consistency checks and output.
+  This isn't always true in the code, but that's the goal.  Really,
+  the whole compile-time scheme should be replaced with something more
+  user-friendly (control variables that can be changed during the run).
+
+  Also floating about are PRESOLVE_SUMMARY and COIN_PRESOLVE_TUNING.
+  -- lh, 111208 --
+*/
+/*! \defgroup PresolveDebugFunctions Presolve Debug Functions
+
+  These functions implement consistency checks on data structures involved
+  in presolve and postsolve and on the components of the lp solution.
+
+  To use these functions, include CoinPresolvePsdebug.hpp in your file and
+  define the compile-time constants PRESOLVE_SUMMARY, PRESOLVE_DEBUG, and
+  PRESOLVE_CONSISTENCY. A value is needed (<i>i.e.</i>, PRESOLVE_DEBUG=1).
+  In a few places, higher values will get you a bit more output.
+
+                        ********
+
+  Define the symbols PRESOLVE_DEBUG and PRESOLVE_CONSISTENCY on the configure
+  command line (use ADD_CXXFLAGS), in a Makefile, or similar and do a full
+  rebuild (including any presolve driver code). If the symbols are not
+  consistently nonzero across *all* presolve code, you'll get something
+  between garbage and a core dump! Debugging adds messages to CoinMessage
+  and allocates and maintains arrays that hold debug information.
+
+  That said, given that you've configured and built with PRESOLVE_DEBUG and
+  PRESOLVE_CONSISTENCY nonzero everywhere, it's safe to adjust PRESOLVE_DEBUG
+  to values in the range 1..n in individual files to increase or decrease the
+  amount of output.
+
+  The suggested approach for PRESOLVE_DEBUG is to define it to 1 in the build
+  and then increase it in individual presolve code files to get more detail.
+
+                        ********
+*/
+//@{
+
+/*! \relates CoinPresolveMatrix
+    \brief Check column-major and/or row-major matrices for duplicate
+	   entries in the major vectors.
+
+  By default, scans both the column- and row-major matrices. Set doCol (doRow)
+  to false to suppress the column (row) scan.
+*/
+void presolve_no_dups(const CoinPresolveMatrix *preObj,
+		      bool doCol = true, bool doRow = true) ;
+
+/*! \relates CoinPresolveMatrix
+    \brief Check the links which track storage order for major vectors in
+    the bulk storage area.
+
+  By default, scans both the column- and row-major matrix. Set doCol = false to
+  suppress the column-major scan. Set doRow = false to suppres the row-major
+  scan. 
+*/
+void presolve_links_ok(const CoinPresolveMatrix *preObj,
+		       bool doCol = true, bool doRow = true) ;
+
+/*! \relates CoinPresolveMatrix
+    \brief Check for explicit zeros in the column- and/or row-major matrices.
+
+  By default, scans both the column- and row-major matrices. Set doCol (doRow)
+  to false to suppress the column (row) scan.
+*/
+void presolve_no_zeros(const CoinPresolveMatrix *preObj,
+		       bool doCol = true, bool doRow = true) ;
+
+/*! \relates CoinPresolveMatrix
+    \brief Checks for equivalence of the column- and row-major matrices.
+
+  Normally the routine will test for coefficient presence and value. Set
+  \p chkvals to false to suppress the check for equal value.
+*/
+void presolve_consistent(const CoinPresolveMatrix *preObj,
+			 bool chkvals = true) ;
+
+/*! \relates CoinPostsolveMatrix
+    \brief Checks that column threads agree with column lengths
+*/
+void presolve_check_threads(const CoinPostsolveMatrix *obj) ;
+
+/*! \relates CoinPostsolveMatrix
+    \brief Checks the free list
+
+    Scans the thread of free locations in the bulk store and checks that all
+    entries are reasonable (0 <= index < bulk0_). If chkElemCnt is true, it
+    also checks that the total number of entries in the matrix plus the
+    locations on the free list total to the size of the bulk store. Postsolve
+    routines do not maintain an accurate element count, but this is useful
+    for checking a newly constructed postsolve matrix.
+*/
+void presolve_check_free_list(const CoinPostsolveMatrix *obj,
+			      bool chkElemCnt = false) ;
+
+/*! \relates CoinPostsolveMatrix
+    \brief Check stored reduced costs for accuracy and consistency with
+	   variable status.
+
+  The routine will check the value of the reduced costs for architectural
+  variables (CoinPrePostsolveMatrix::rcosts_). It performs an accuracy check
+  by recalculating the reduced cost from scratch. It will also check the
+  value for consistency with the status information in
+  CoinPrePostsolveMatrix::colstat_.
+*/
+void presolve_check_reduced_costs(const CoinPostsolveMatrix *obj) ;
+
+/*! \relates CoinPostsolveMatrix
+    \brief Check the dual variables for consistency with row activity.
+
+  The routine checks that the value of the dual variable is consistent
+  with the state of the constraint (loose, tight at lower bound, or tight at
+  upper bound).
+*/
+void presolve_check_duals(const CoinPostsolveMatrix *postObj) ;
+
+/*! \relates CoinPresolveMatrix
+    \brief Check primal solution and architectural variable status.
+
+    The architectural variables can be checked for bogus values, feasibility,
+    and valid status. The row activity is checked for bogus values, accuracy,
+    and feasibility.  By default, row activity is not checked (presolve is
+    sloppy about maintaining it). See the definitions in
+    CoinPresolvePsdebug.cpp for more information.
+*/
+void presolve_check_sol(const CoinPresolveMatrix *preObj,
+			int chkColSol = 2, int chkRowAct = 1,
+			int chkStatus = 1) ;
+
+/*! \relates CoinPostsolveMatrix
+    \brief Check primal solution and architectural variable status.
+
+    The architectural variables can be checked for bogus values, feasibility,
+    and valid status. The row activity is checked for bogus values, accuracy,
+    and feasibility. See the definitions in CoinPresolvePsdebug.cpp for more
+    information.
+*/
+void presolve_check_sol(const CoinPostsolveMatrix *postObj,
+			int chkColSol = 2, int chkRowAct = 2,
+			int chkStatus = 1) ;
+
+/*! \relates CoinPresolveMatrix
+    \brief Check for the proper number of basic variables.
+*/
+void presolve_check_nbasic(const CoinPresolveMatrix *preObj) ;
+
+/*! \relates CoinPostsolveMatrix
+    \brief Check for the proper number of basic variables.
+*/
+void presolve_check_nbasic(const CoinPostsolveMatrix *postObj) ;
+
+//@}
+
+#endif