1 files changed, 116 insertions, 0 deletions
diff --git a/newstructure/thirdparty/linux/include/coin/CoinPresolveEmpty.hpp b/newstructure/thirdparty/linux/include/coin/CoinPresolveEmpty.hpp
new file mode 100644
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+++ b/newstructure/thirdparty/linux/include/coin/CoinPresolveEmpty.hpp
@@ -0,0 +1,116 @@
+/* $Id: CoinPresolveEmpty.hpp 1561 2012-11-24 00:32:16Z 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 CoinPresolveEmpty_H
+#define CoinPresolveEmpty_H
+
+/*! \file
+
+  Drop/reinsert empty rows/columns.
+*/
+
+const int DROP_ROW = 3;
+const int DROP_COL = 4;
+
+/*! \class drop_empty_cols_action
+    \brief Physically removes empty columns in presolve, and reinserts
+	   empty columns in postsolve.
+
+  Physical removal of rows and columns should be the last activities
+  performed during presolve. Do them exactly once. The row-major matrix
+  is <b>not</b> maintained by this transform.
+
+  To physically drop the columns, CoinPrePostsolveMatrix::mcstrt_ and
+  CoinPrePostsolveMatrix::hincol_ are compressed, along with column bounds,
+  objective, and (if present) the column portions of the solution. This
+  renumbers the columns. drop_empty_cols_action::presolve will reconstruct
+  CoinPresolveMatrix::clink_.
+
+  \todo Confirm correct behaviour with solution in presolve.
+*/
+
+class drop_empty_cols_action : public CoinPresolveAction {
+private:
+  const int nactions_;
+
+  struct action {
+    double clo;
+    double cup;
+    double cost;
+    double sol;
+    int jcol;
+  };
+  const action *const actions_;
+
+  drop_empty_cols_action(int nactions,
+			 const action *const actions,
+			 const CoinPresolveAction *next) :
+    CoinPresolveAction(next),
+    nactions_(nactions), 
+    actions_(actions)
+  {}
+
+ public:
+  const char *name() const { return ("drop_empty_cols_action"); }
+
+  static const CoinPresolveAction *presolve(CoinPresolveMatrix *,
+					 const int *ecols,
+					 int necols,
+					 const CoinPresolveAction*);
+
+  static const CoinPresolveAction *presolve(CoinPresolveMatrix *prob,
+					 const CoinPresolveAction *next);
+
+  void postsolve(CoinPostsolveMatrix *prob) const;
+
+  virtual ~drop_empty_cols_action() { deleteAction(actions_,action*); }
+};
+
+
+/*! \class drop_empty_rows_action
+    \brief Physically removes empty rows in presolve, and reinserts
+	   empty rows in postsolve.
+
+  Physical removal of rows and columns should be the last activities
+  performed during presolve. Do them exactly once. The row-major matrix
+  is <b>not</b> maintained by this transform.
+
+  To physically drop the rows, the rows are renumbered, excluding empty
+  rows. This involves rewriting CoinPrePostsolveMatrix::hrow_ and compressing
+  the row bounds and (if present) the row portions of the solution.
+
+  \todo Confirm behaviour when a solution is present in presolve.
+*/
+class drop_empty_rows_action : public CoinPresolveAction {
+private:
+  struct action {
+    double rlo;
+    double rup;
+    int row;
+    int fill_row;	// which row was moved into position row to fill it
+  };
+
+  const int nactions_;
+  const action *const actions_;
+
+  drop_empty_rows_action(int nactions,
+			 const action *actions,
+			 const CoinPresolveAction *next) :
+    CoinPresolveAction(next),
+    nactions_(nactions), actions_(actions)
+{}
+
+ public:
+  const char *name() const { return ("drop_empty_rows_action"); }
+
+  static const CoinPresolveAction *presolve(CoinPresolveMatrix *prob,
+					    const CoinPresolveAction *next);
+
+  void postsolve(CoinPostsolveMatrix *prob) const;
+
+  virtual ~drop_empty_rows_action() { deleteAction(actions_,action*); }
+};
+#endif
+