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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmVariableWatch_h
#define cmVariableWatch_h
#include "cmConfigure.h" // IWYU pragma: keep
#include <map>
#include <string>
#include <vector>
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);
typedef void (*DeleteData)(void* client_data);
cmVariableWatch();
~cmVariableWatch();
/**
* Add watch to the variable
*/
bool AddWatch(const std::string& variable, WatchMethod method,
void* client_data = nullptr, DeleteData delete_data = nullptr);
void RemoveWatch(const std::string& variable, WatchMethod method,
void* client_data = nullptr);
/**
* This method is called when variable is accessed
*/
bool 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,
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;
DeleteData DeleteDataCall;
Pair()
: Method(nullptr)
, ClientData(nullptr)
, DeleteDataCall(nullptr)
{
}
~Pair()
{
if (this->DeleteDataCall && this->ClientData) {
this->DeleteDataCall(this->ClientData);
}
}
};
typedef std::vector<Pair*> VectorOfPairs;
typedef std::map<std::string, VectorOfPairs> StringToVectorOfPairs;
StringToVectorOfPairs WatchMap;
};
#endif
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