Add option of watching variables

1 files changed, 72 insertions, 0 deletions

diff --git a/Source/cmVariableWatch.h b/Source/cmVariableWatch.h
new file mode 100644
index 0000000000..88fdd5404a
--- /dev/null
+++ b/Source/cmVariableWatch.h
@@ -0,0 +1,72 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef cmVariableWatch_h
+#define cmVariableWatch_h
+
+#include "cmStandardIncludes.h"
+
+/** \class cmVariableWatch
+ * \brief Helper class for watching of variable accesses.
+ *
+ * Calls function when variable is accessed
+ */
+class cmVariableWatch
+{
+public:
+  typedef void (WatchMethod)(const std::string& variable, int access_type, void* client_data);
+
+  cmVariableWatch();
+  ~cmVariableWatch();
+
+  /**
+   * Add watch to the variable
+   */
+  void AddWatch(const std::string& variable, WatchMethod method, void* client_data=0);
+  
+  /**
+   * This method is called when variable is accessed
+   */
+  void VariableAccessed(const std::string& variable, int access_type) const;
+
+  /**
+   * Different access types.
+   */
+  enum
+    {
+      VARIABLE_READ_ACCESS,
+      UNKNOWN_VARIABLE_READ_ACCESS,
+      VARIABLE_MODIFIED_ACCESS,
+      VARIABLE_REMOVED_ACCESS,
+      NO_ACCESS
+    };
+  
+protected:
+  struct Pair
+  {
+    WatchMethod* m_Method;
+    void*        m_ClientData;
+    Pair() : m_Method(0), m_ClientData(0) {}
+  };
+
+  typedef std::vector< Pair > VectorOfPairs;
+  typedef std::map<std::string, VectorOfPairs > StringToVectorOfPairs;
+
+  StringToVectorOfPairs m_WatchMap;
+};
+
+
+#endif