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Diffstat (limited to 'zen/com_ptr.h')
| -rw-r--r-- | zen/com_ptr.h | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/zen/com_ptr.h b/zen/com_ptr.h deleted file mode 100644 index 6fb9f2cd..00000000 --- a/zen/com_ptr.h +++ /dev/null @@ -1,120 +0,0 @@ -// ************************************************************************** -// * This file is part of the FreeFileSync project. It is distributed under * -// * GNU General Public License: http://www.gnu.org/licenses/gpl.html * -// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved * -// ************************************************************************** - -#ifndef SMART_COM_PTR_H -#define SMART_COM_PTR_H - -#include <algorithm> -#include "win.h" //includes "windows.h" -> always include before other headers that also might include "windows.h"! -#include <Objbase.h> - -namespace zen -{ -/* -ComPtr: RAII class handling COM objects - -Example: --------- - ComPtr<IUPnPDeviceFinder> devFinder; - if (FAILED(::CoCreateInstance(CLSID_UPnPDeviceFinder, - nullptr, - CLSCTX_ALL, - IID_PPV_ARGS(devFinder.init())))) - return -1; - - ComPtr<IEnumUnknown> devEnum = com_dynamic_cast<IEnumUnknown>(devColl); - if (!devEnum) - return -1; -*/ - -template <class T> -class ComPtr -{ -public: - ComPtr() : ptr(nullptr) {} // - ComPtr(const ComPtr& other) : ptr(other.ptr) { if (ptr) ptr->AddRef(); } //noexcept in C++11 - ComPtr( ComPtr&& tmp ) : ptr(tmp.release()) {} // - ~ComPtr() { if (ptr) ptr->Release(); } //has exception spec of compiler-generated destructor by default - - ComPtr& operator=(const ComPtr& other) { ComPtr(other).swap(*this); return *this; } //noexcept in C++11 - ComPtr& operator=(ComPtr&& tmp) { swap(tmp); return *this; } // - //don't use unifying assignment but save one move-construction in the r-value case instead! - - void swap(ComPtr& rhs) { std::swap(ptr, rhs.ptr); } //noexcept in C++11 - - T** init() //get pointer for use with ::CoCreateInstance() - { - ComPtr<T>().swap(*this); - return &ptr; - } - - T* get() const { return ptr; } - - T* operator->() const { return ptr; } - T& operator* () const { return *ptr; } - - T* release() //noexcept in C++11 - { - T* tmp = ptr; - ptr = nullptr; - return tmp; - } - -private: - T* ptr; - - struct ConversionToBool { int dummy; }; -public: - //use member pointer as implicit conversion to bool (C++ Templates - Vandevoorde/Josuttis; chapter 20) - operator int ConversionToBool::* () const { return ptr != nullptr ? &ConversionToBool::dummy : nullptr; } -}; - - -template <class S, class T> -ComPtr<S> com_dynamic_cast(const ComPtr<T>& other); //noexcept in C++11 - - - - - - - - - - - - - - - - - - - - - - -//################# implementation ############################# - -//we cannot partially specialize std::swap() for a class template and are not allowed to overload it => offer swap in own namespace -template <class T> inline -void swap(zen::ComPtr<T>& lhs, zen::ComPtr<T>& rhs) -{ - lhs.swap(rhs); -} - - -template <class S, class T> inline -ComPtr<S> com_dynamic_cast(const ComPtr<T>& other) //noexcept in C++11 -{ - ComPtr<S> outPtr; - if (other) - other->QueryInterface(IID_PPV_ARGS(outPtr.init())); - return outPtr; -} -} - -#endif //SMART_COM_PTR_H
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