mirror of
https://github.com/LSPosed/DexBuilder.git
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76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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namespace slicer {
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// A simple and lightweight scope guard and macro
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// (inspired by Andrei Alexandrescu's C++11 Scope Guard)
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//
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// Here is how it's used:
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//
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// FILE* file = std::fopen(...);
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// SLICER_SCOPE_EXIT {
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// std::fclose(file);
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// };
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//
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// "file" will be closed at the end of the enclosing scope,
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// regardless of how the scope is exited
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//
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class ScopeGuardHelper
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{
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template<class T>
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class ScopeGuard
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{
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public:
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explicit ScopeGuard(T closure) :
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closure_(std::move(closure))
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{
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}
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~ScopeGuard()
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{
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closure_();
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}
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// move constructor only
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ScopeGuard(ScopeGuard&&) = default;
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ScopeGuard(const ScopeGuard&) = delete;
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ScopeGuard& operator=(const ScopeGuard&) = delete;
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ScopeGuard& operator=(ScopeGuard&&) = delete;
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private:
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T closure_;
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};
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public:
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template<class T>
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ScopeGuard<T> operator<<(T closure)
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{
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return ScopeGuard<T>(std::move(closure));
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}
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};
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#define SLICER_SG_MACRO_CONCAT2(a, b) a ## b
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#define SLICER_SG_MACRO_CONCAT(a, b) SLICER_SG_MACRO_CONCAT2(a, b)
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#define SLICER_SG_ANONYMOUS(prefix) SLICER_SG_MACRO_CONCAT(prefix, __COUNTER__)
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#define SLICER_SCOPE_EXIT \
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auto SLICER_SG_ANONYMOUS(_scope_guard_) = slicer::ScopeGuardHelper() << [&]()
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} // namespace slicer
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