change to allow cleaning of a preprocess object

Author: jjhforrest

src/CglPreProcess/CglPreProcess.cpp

@@ -8791,6 +8791,23 @@ void CglPreProcess::gutsOfDestructor()
   rowType_ = NULL;
   numberRowType_ = 0;
 }
+// Clears models
+void CglPreProcess::clean()
+{
+  for (int i = 0; i < numberSolvers_; i++) {
+    delete model_[i];
+    delete modifiedModel_[i];
+    delete presolve_[i];
+  }
+  delete[] model_;
+  delete[] modifiedModel_;
+  delete[] presolve_;
+  model_ = NULL;
+  modifiedModel_ = NULL;
+  presolve_ = NULL;
+  delete startModel_;
+  startModel_ = NULL;
+ }
 // Add one generator
 void CglPreProcess::addCutGenerator(CglCutGenerator *generator)
 {

src/CglPreProcess/CglPreProcess.hpp

@@ -339,6 +339,9 @@ class CGLLIB_EXPORT CglPreProcess {
   /// Clears out as much as possible
   void gutsOfDestructor();
 
+  /// Gets rid of models
+  void clean();
+
   /// Set time limit
   void setTimeLimit(const double timeLimit, const bool useElapsedTime);