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/*=========================================================================
Program: CMake - Cross-Platform Makefile Generator
Module: $RCSfile: cmVariableWatch.h,v $
Language: C++
Date: $Date: 2007-05-17 21:40:59 $
Version: $Revision: 1.10 $
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 cmMakefile;
/** \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, const char* newValue, const cmMakefile* mf);
cmVariableWatch();
~cmVariableWatch();
/**
* Add watch to the variable
*/
void AddWatch(const std::string& variable, WatchMethod method,
void* client_data=0);
void RemoveWatch(const std::string& variable, WatchMethod method);
/**
* This method is called when variable is accessed
*/
void VariableAccessed(const std::string& variable, int access_type,
const char* newValue, const cmMakefile* mf) const;
/**
* Different access types.
*/
enum
{
VARIABLE_READ_ACCESS = 0,
UNKNOWN_VARIABLE_READ_ACCESS,
UNKNOWN_VARIABLE_DEFINED_ACCESS,
ALLOWED_UNKNOWN_VARIABLE_READ_ACCESS,
VARIABLE_MODIFIED_ACCESS,
VARIABLE_REMOVED_ACCESS,
NO_ACCESS
};
/**
* Return the access as string
*/
static const char* GetAccessAsString(int access_type);
protected:
struct Pair
{
WatchMethod Method;
void* ClientData;
Pair() : Method(0), ClientData(0) {}
};
typedef std::vector< Pair > VectorOfPairs;
typedef std::map<cmStdString, VectorOfPairs > StringToVectorOfPairs;
StringToVectorOfPairs WatchMap;
};
#endif
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