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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 <memory>
#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:
using WatchMethod = void (*)(const std::string&, int, void*, const char*,
const cmMakefile*);
using DeleteData = void (*)(void*);
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 = nullptr;
void* ClientData = nullptr;
DeleteData DeleteDataCall = nullptr;
~Pair()
{
if (this->DeleteDataCall && this->ClientData) {
this->DeleteDataCall(this->ClientData);
}
}
Pair() = default;
Pair(const Pair&) = delete;
Pair& operator=(const Pair&) = delete;
};
using VectorOfPairs = std::vector<std::shared_ptr<Pair>>;
using StringToVectorOfPairs = std::map<std::string, VectorOfPairs>;
StringToVectorOfPairs WatchMap;
};
#endif
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