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diff --git a/build/Bonmin/include/coin/CoinWarmStart.hpp b/build/Bonmin/include/coin/CoinWarmStart.hpp
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+++ b/build/Bonmin/include/coin/CoinWarmStart.hpp
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+/* $Id: CoinWarmStart.hpp 1372 2011-01-03 23:31:00Z lou $ */
+// 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 CoinWarmStart_H
+#define CoinWarmStart_H
+
+//#############################################################################
+
+class CoinWarmStartDiff;
+
+/** Abstract base class for warm start information.
+
+    Really nothing can be generalized for warm start information --- all we
+    know is that it exists. Hence the abstract base class contains only a
+    virtual destructor and a virtual clone function (a virtual constructor),
+    so that derived classes can provide these functions.
+*/
+
+class CoinWarmStart {
+public:
+
+  /// Abstract destructor
+  virtual ~CoinWarmStart() {}
+
+  /// `Virtual constructor'
+  virtual CoinWarmStart *clone() const = 0 ;
+   
+  virtual CoinWarmStartDiff*
+  generateDiff (const CoinWarmStart *const ) const { return 0; }
+   
+   
+  virtual void
+  applyDiff (const CoinWarmStartDiff *const ) {}
+
+};
+
+
+/*! \class CoinWarmStartDiff
+    \brief Abstract base class for warm start `diff' objects
+
+  For those types of warm start objects where the notion of a `diff' makes
+  sense, this virtual base class is provided. As with CoinWarmStart, its sole
+  reason for existence is to make it possible to write solver-independent code.
+*/
+
+class CoinWarmStartDiff {
+public:
+
+  /// Abstract destructor
+  virtual ~CoinWarmStartDiff() {}
+
+  /// `Virtual constructor'
+  virtual CoinWarmStartDiff *clone() const = 0 ;
+};
+
+#endif