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