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//*********************************************************
//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the MIT License.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT.
//
//*********************************************************
#ifndef __WIL_CPPWINRT_WRL_INCLUDED
#define __WIL_CPPWINRT_WRL_INCLUDED
#include "cppwinrt.h"
#include <winrt\base.h>
#include "result_macros.h"
#include <wrl\module.h>
// wil::wrl_factory_for_winrt_com_class provides interopability between a
// C++/WinRT class and the WRL Module system, allowing the winrt class to be
// CoCreatable.
//
// Usage:
// - In your cpp, add:
// CoCreatableCppWinRtClass(className)
//
// - In the dll.cpp (or equivalent) for the module containing your class, add:
// CoCreatableClassWrlCreatorMapInclude(className)
//
namespace wil
{
namespace details
{
template <typename TCppWinRTClass>
class module_count_wrapper : public TCppWinRTClass
{
public:
module_count_wrapper()
{
if (auto modulePtr = ::Microsoft::WRL::GetModuleBase())
{
modulePtr->IncrementObjectCount();
}
}
virtual ~module_count_wrapper()
{
if (auto modulePtr = ::Microsoft::WRL::GetModuleBase())
{
modulePtr->DecrementObjectCount();
}
}
};
}
template <typename TCppWinRTClass>
class wrl_factory_for_winrt_com_class : public ::Microsoft::WRL::ClassFactory<>
{
public:
IFACEMETHODIMP CreateInstance(_In_opt_ ::IUnknown* unknownOuter, REFIID riid, _COM_Outptr_ void **object) noexcept try
{
*object = nullptr;
RETURN_HR_IF(CLASS_E_NOAGGREGATION, unknownOuter != nullptr);
return winrt::make<details::module_count_wrapper<TCppWinRTClass>>().as(riid, object);
}
CATCH_RETURN()
};
}
#define CoCreatableCppWinRtClass(className) CoCreatableClassWithFactory(className, ::wil::wrl_factory_for_winrt_com_class<className>)
#endif // __WIL_CPPWINRT_WRL_INCLUDED
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