/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef mozilla_mscom_DynamicallyLinkedFunctionPtr_h #define mozilla_mscom_DynamicallyLinkedFunctionPtr_h #include "mozilla/Move.h" #include <windows.h> namespace mozilla { namespace mscom { template <typename T> class DynamicallyLinkedFunctionPtr; template <typename R, typename... Args> class DynamicallyLinkedFunctionPtr<R (__stdcall*)(Args...)> { typedef R (__stdcall* FunctionPtrT)(Args...); public: DynamicallyLinkedFunctionPtr(const wchar_t* aLibName, const char* aFuncName) : mModule(NULL) , mFunction(nullptr) { mModule = ::LoadLibraryW(aLibName); if (mModule) { mFunction = reinterpret_cast<FunctionPtrT>( ::GetProcAddress(mModule, aFuncName)); } } DynamicallyLinkedFunctionPtr(const DynamicallyLinkedFunctionPtr&) = delete; DynamicallyLinkedFunctionPtr& operator=(const DynamicallyLinkedFunctionPtr&) = delete; DynamicallyLinkedFunctionPtr(DynamicallyLinkedFunctionPtr&&) = delete; DynamicallyLinkedFunctionPtr& operator=(DynamicallyLinkedFunctionPtr&&) = delete; ~DynamicallyLinkedFunctionPtr() { if (mModule) { ::FreeLibrary(mModule); } } R operator()(Args... args) { return mFunction(mozilla::Forward<Args>(args)...); } explicit operator bool() const { return !!mFunction; } private: HMODULE mModule; FunctionPtrT mFunction; }; } // namespace mscom } // namespace mozilla #endif // mozilla_mscom_DynamicallyLinkedFunctionPtr_h