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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.
*
**************************************************************************/
#ifndef COM_PTR_HPP
#define COM_PTR_HPP
#include <assert.h>
/**
* Simple smart pointer template for COM interfaces.
*/
template< class T >
class com_ptr
{
private:
T *p;
public:
com_ptr(void) {
p = NULL;
}
~com_ptr() {
if (p) {
p->Release();
}
}
// Used when initializing
T **
operator & () {
assert(p == NULL);
return &p;
}
// Implict cast to T*
operator T * () const {
return p;
}
// Methods
T *
operator -> () const {
return p;
}
T *
operator = (T *q) {
if (p) {
p->Release();
}
if (q) {
q->AddRef();
}
return p = q;
}
private:
com_ptr(const com_ptr &);
com_ptr & operator= (const com_ptr &);
};
#endif // COM_PTR_HPP
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