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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de) *
// **************************************************************************
//
#ifndef C_DLL_HEADER
#define C_DLL_HEADER
#include <string>
#include <map>
#undef min
#include <algorithm>
namespace c_dll
{
void writeString(const std::wstring& input, wchar_t* output, size_t outputLen);
//Convert handles to objects and vice versa
template <class S, class T> //T: prefer managed object to ensure cleanup if remove() is not called
class HandleProvider
{
public:
static HandleProvider& instance();
S insert(T object);
void remove(S handle);
T& retrieve(S handle); //return default-constructed object if not found
private:
HandleProvider() {}
HandleProvider(const HandleProvider&);
HandleProvider& operator=(const HandleProvider&);
S generate();
std::map<S, T> handleMap;
};
/*
Example:
typedef HandleProvider<TBHandle, ComPtr<ITaskbarList3> > HandleTaskbarMap;
HandleTaskbarMap::instance().insert(xyz);
*/
//########################## inline implementation #############################
inline
void writeString(const std::wstring& input, wchar_t* output, size_t outputLen)
{
if (outputLen > 0)
{
const size_t maxSize = std::min(input.length(), outputLen - 1);
std::copy(input.begin(), input.begin() + maxSize, output);
output[maxSize] = 0;
}
}
template <class S, class T>
inline
HandleProvider<S, T>& HandleProvider<S, T>::instance()
{
static HandleProvider inst;
return inst;
}
//convert handles to objects and vice versa
template <class S, class T>
inline
S HandleProvider<S, T>::insert(T object)
{
S newHandle = generate();
handleMap.insert(std::make_pair(newHandle, object));
return newHandle;
}
template <class S, class T>
inline
void HandleProvider<S, T>::remove(S handle)
{
handleMap.erase(handle);
}
template <class S, class T>
inline
T& HandleProvider<S, T>::retrieve(S handle) //return default-constructed object if not found
{
return handleMap[handle];
}
template <class S, class T>
inline
S HandleProvider<S, T>::generate()
{
static S handle = 0;
return ++handle; //don't return 0! 0 is reserved for indicating failure
}
}
#endif //C_DLL_HEADER
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