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265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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_DynamicallyLinkedFunctionPtr_h
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#define mozilla_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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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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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), mFunction(nullptr) {
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mModule = ::LoadLibraryW(aLibName);
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if (mModule) {
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mFunction =
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reinterpret_cast<FunctionPtrT>(::GetProcAddress(mModule, aFuncName));
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if (!mFunction) {
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// Since the function doesn't exist, there is no point in holding a
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// reference to mModule anymore.
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::FreeLibrary(mModule);
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mModule = NULL;
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}
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}
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}
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DynamicallyLinkedFunctionPtr(const DynamicallyLinkedFunctionPtr&) = delete;
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DynamicallyLinkedFunctionPtr& operator=(const DynamicallyLinkedFunctionPtr&) =
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delete;
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DynamicallyLinkedFunctionPtr(DynamicallyLinkedFunctionPtr&&) = delete;
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DynamicallyLinkedFunctionPtr& operator=(DynamicallyLinkedFunctionPtr&&) =
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delete;
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~DynamicallyLinkedFunctionPtr() {
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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) const {
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return mFunction(std::forward<Args>(args)...);
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}
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explicit operator bool() const { return !!mFunction; }
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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 mozilla
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#endif // mozilla_DynamicallyLinkedFunctionPtr_h
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