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/**************************************************************************
*
* Copyright 2014 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#pragma once
#include <assert.h>
#include <windows.h>
/**
* Simple smart pointer template for COM interfaces.
*
* - https://msdn.microsoft.com/en-us/magazine/dn904668.aspx
* - https://msdn.microsoft.com/en-us/library/417w8b3b.aspx
* - https://msdn.microsoft.com/en-us/library/ezzw7k98.aspx
*/
template< typename T >
class com_ptr
{
private:
T *p;
public:
com_ptr(void) :
p(nullptr)
{
}
com_ptr(T *_p) :
p(_p)
{
}
~com_ptr() {
T *temp = p;
p = nullptr;
if (temp) {
temp->Release();
}
}
// Used when initializing
T **
operator & () {
assert(p == nullptr);
return &p;
}
// Implict cast to T*
operator T * () const {
return p;
}
struct no_ref_count : public T
{
private:
ULONG STDMETHODCALLTYPE AddRef(void);
ULONG STDMETHODCALLTYPE Release(void);
};
// Methods
no_ref_count *
operator -> () const {
assert(p != nullptr);
return static_cast< no_ref_count *>(p);
}
com_ptr &
operator = (T *q) {
if (p != q) {
T *temp = p;
p = q;
if (temp) {
temp->Release();
}
if (q) {
q->AddRef();
}
}
return *this;
}
com_ptr(const com_ptr &) = delete;
com_ptr & operator= (const com_ptr &) = delete;
};
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