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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-ws-lib
* Created on: 22 июл. 2022 г.
*
* lsp-ws-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-ws-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-ws-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_WIN_COM_H_
#define PRIVATE_WIN_COM_H_
#include <lsp-plug.in/common/types.h>
#ifdef PLATFORM_WINDOWS
#define LSP_IUNKNOWN_IFACE \
private: \
ULONG nRefCount; \
\
public: /* IUnknown */ \
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void **ppvObject) override; \
virtual ULONG STDMETHODCALLTYPE AddRef() override; \
virtual ULONG STDMETHODCALLTYPE Release() override;
#define LSP_IUNKNOWN_IMPL(Class, ParentIface) \
HRESULT STDMETHODCALLTYPE Class::QueryInterface(REFIID iid, void **ppvObject) \
{ \
if (IsEqualIID(iid, IID_IUnknown) || \
IsEqualIID(iid, __uuidof(ParentIface))) \
{ \
*ppvObject = safe_acquire(this); \
return S_OK; \
} \
\
*ppvObject = NULL; \
return E_NOINTERFACE; \
} \
\
ULONG STDMETHODCALLTYPE Class::AddRef() \
{ \
return InterlockedIncrement(&nRefCount); \
} \
\
ULONG STDMETHODCALLTYPE Class::Release() \
{ \
ULONG newCount = InterlockedDecrement(&nRefCount); \
if (newCount == 0) \
delete this; \
return newCount; \
}
namespace lsp
{
namespace ws
{
namespace win
{
// Releases reference, if non-null.
template <class T>
static inline void safe_release(T * &obj)
{
if (obj != NULL)
{
obj->Release();
obj = NULL;
}
}
// Acquires an additional reference, if non-null.
template <class T>
inline T *safe_acquire(T * obj)
{
if (obj != NULL)
obj->AddRef();
return obj;
}
} /* namespace win */
} /* namespace ws */
} /* namespace lsp */
#endif /* PLATFORM_WINDOWS */
#endif /* PRIVATE_WIN_COM_H_ */
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