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diff --git a/lemon/lemon/lp_skeleton.cc b/lemon/lemon/lp_skeleton.cc
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+++ b/lemon/lemon/lp_skeleton.cc
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+/* -*- mode: C++; indent-tabs-mode: nil; -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library.
+ *
+ * Copyright (C) 2003-2010
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+#include <lemon/lp_skeleton.h>
+
+///\file
+///\brief A skeleton file to implement LP solver interfaces
+namespace lemon {
+
+  int SkeletonSolverBase::_addCol()
+  {
+    return ++col_num;
+  }
+
+  int SkeletonSolverBase::_addRow()
+  {
+    return ++row_num;
+  }
+
+  int SkeletonSolverBase::_addRow(Value, ExprIterator, ExprIterator, Value)
+  {
+    return ++row_num;
+  }
+
+  void SkeletonSolverBase::_eraseCol(int) {}
+  void SkeletonSolverBase::_eraseRow(int) {}
+
+  void SkeletonSolverBase::_getColName(int, std::string &) const {}
+  void SkeletonSolverBase::_setColName(int, const std::string &) {}
+  int SkeletonSolverBase::_colByName(const std::string&) const { return -1; }
+
+  void SkeletonSolverBase::_getRowName(int, std::string &) const {}
+  void SkeletonSolverBase::_setRowName(int, const std::string &) {}
+  int SkeletonSolverBase::_rowByName(const std::string&) const { return -1; }
+
+  void SkeletonSolverBase::_setRowCoeffs(int, ExprIterator, ExprIterator) {}
+  void SkeletonSolverBase::_getRowCoeffs(int, InsertIterator) const {}
+
+  void SkeletonSolverBase::_setColCoeffs(int, ExprIterator, ExprIterator) {}
+  void SkeletonSolverBase::_getColCoeffs(int, InsertIterator) const {}
+
+  void SkeletonSolverBase::_setCoeff(int, int, Value) {}
+  SkeletonSolverBase::Value SkeletonSolverBase::_getCoeff(int, int) const
+  { return 0; }
+
+  void SkeletonSolverBase::_setColLowerBound(int, Value) {}
+  SkeletonSolverBase::Value SkeletonSolverBase::_getColLowerBound(int) const
+  {  return 0; }
+
+  void SkeletonSolverBase::_setColUpperBound(int, Value) {}
+  SkeletonSolverBase::Value SkeletonSolverBase::_getColUpperBound(int) const
+  {  return 0; }
+
+  void SkeletonSolverBase::_setRowLowerBound(int, Value) {}
+  SkeletonSolverBase::Value SkeletonSolverBase::_getRowLowerBound(int) const
+  {  return 0; }
+
+  void SkeletonSolverBase::_setRowUpperBound(int, Value) {}
+  SkeletonSolverBase::Value SkeletonSolverBase::_getRowUpperBound(int) const
+  {  return 0; }
+
+  void SkeletonSolverBase::_setObjCoeffs(ExprIterator, ExprIterator) {}
+  void SkeletonSolverBase::_getObjCoeffs(InsertIterator) const {};
+
+  void SkeletonSolverBase::_setObjCoeff(int, Value) {}
+  SkeletonSolverBase::Value SkeletonSolverBase::_getObjCoeff(int) const
+  {  return 0; }
+
+  void SkeletonSolverBase::_setSense(Sense) {}
+  SkeletonSolverBase::Sense SkeletonSolverBase::_getSense() const
+  { return MIN; }
+
+  void SkeletonSolverBase::_clear() {
+    row_num = col_num = 0;
+  }
+
+  void SkeletonSolverBase::_messageLevel(MessageLevel) {}
+
+  LpSkeleton::SolveExitStatus LpSkeleton::_solve() { return SOLVED; }
+
+  LpSkeleton::Value LpSkeleton::_getPrimal(int) const { return 0; }
+  LpSkeleton::Value LpSkeleton::_getDual(int) const { return 0; }
+  LpSkeleton::Value LpSkeleton::_getPrimalValue() const { return 0; }
+
+  LpSkeleton::Value LpSkeleton::_getPrimalRay(int) const { return 0; }
+  LpSkeleton::Value LpSkeleton::_getDualRay(int) const { return 0; }
+
+  LpSkeleton::ProblemType LpSkeleton::_getPrimalType() const
+  { return UNDEFINED; }
+
+  LpSkeleton::ProblemType LpSkeleton::_getDualType() const
+  { return UNDEFINED; }
+
+  LpSkeleton::VarStatus LpSkeleton::_getColStatus(int) const
+  { return BASIC; }
+
+  LpSkeleton::VarStatus LpSkeleton::_getRowStatus(int) const
+  { return BASIC; }
+
+  LpSkeleton* LpSkeleton::newSolver() const
+  { return static_cast<LpSkeleton*>(0); }
+
+  LpSkeleton* LpSkeleton::cloneSolver() const
+  { return static_cast<LpSkeleton*>(0); }
+
+  const char* LpSkeleton::_solverName() const { return "LpSkeleton"; }
+
+  MipSkeleton::SolveExitStatus MipSkeleton::_solve()
+  { return SOLVED; }
+
+  MipSkeleton::Value MipSkeleton::_getSol(int) const { return 0; }
+  MipSkeleton::Value MipSkeleton::_getSolValue() const { return 0; }
+
+  MipSkeleton::ProblemType MipSkeleton::_getType() const
+  { return UNDEFINED; }
+
+  MipSkeleton* MipSkeleton::newSolver() const
+  { return static_cast<MipSkeleton*>(0); }
+
+  MipSkeleton* MipSkeleton::cloneSolver() const
+  { return static_cast<MipSkeleton*>(0); }
+
+  const char* MipSkeleton::_solverName() const { return "MipSkeleton"; }
+
+} //namespace lemon
+