comptr.h

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00001 /*
00002 **  ClanLib SDK
00003 **  Copyright (c) 1997-2011 The ClanLib Team
00004 **
00005 **  This software is provided 'as-is', without any express or implied
00006 **  warranty.  In no event will the authors be held liable for any damages
00007 **  arising from the use of this software.
00008 **
00009 **  Permission is granted to anyone to use this software for any purpose,
00010 **  including commercial applications, and to alter it and redistribute it
00011 **  freely, subject to the following restrictions:
00012 **
00013 **  1. The origin of this software must not be misrepresented; you must not
00014 **     claim that you wrote the original software. If you use this software
00015 **     in a product, an acknowledgment in the product documentation would be
00016 **     appreciated but is not required.
00017 **  2. Altered source versions must be plainly marked as such, and must not be
00018 **     misrepresented as being the original software.
00019 **  3. This notice may not be removed or altered from any source distribution.
00020 **
00021 **  Note: Some of the libraries ClanLib may link to may have additional
00022 **  requirements or restrictions.
00023 **
00024 **  File Author(s):
00025 **
00026 **    Magnus Norddahl
00027 */
00028 
00029 #pragma once
00030 
00031 
00032 #include "../api_core.h"
00033 
00034 template <typename Type>
00038 class CL_API_CORE CL_ComPtr
00039 {
00040 public:
00041         CL_ComPtr() : ptr(0) { }
00042         CL_ComPtr(Type *ptr) : ptr(ptr) { }
00043         CL_ComPtr(const CL_ComPtr &copy) : ptr(copy.ptr) { if (ptr) ptr->AddRef(); }
00044         ~CL_ComPtr() { clear(); }
00045         CL_ComPtr &operator =(const CL_ComPtr &copy)
00046         {
00047                 if (this == &copy)
00048                         return *this;
00049                 copy.ptr->AddRef();
00050                 if (ptr)
00051                         ptr->Release();
00052                 ptr = copy.ptr;
00053                 return *this;
00054         }
00055         const Type * const operator ->() const { return ptr; }
00056         Type *operator ->() { return ptr; }
00057         operator Type *() { return ptr; }
00058 
00059         bool is_null() const { return ptr == 0; }
00060         void clear() { if (ptr) ptr->Release(); ptr = 0; }
00061         Type **output_variable() { clear(); return &ptr; }
00062 
00063         Type *ptr;
00064 };
00065 
00066