58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <utility>
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#include "common/common_funcs.h"
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namespace detail {
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template <typename Func>
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struct ScopeExitHelper {
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explicit ScopeExitHelper(Func&& func_) : func(std::move(func_)) {}
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~ScopeExitHelper() {
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if (active) {
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func();
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}
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}
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void Cancel() {
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active = false;
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}
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Func func;
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bool active{true};
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};
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template <typename Func>
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ScopeExitHelper<Func> ScopeExit(Func&& func) {
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return ScopeExitHelper<Func>(std::forward<Func>(func));
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}
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} // namespace detail
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/**
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* This macro allows you to conveniently specify a block of code that will run on scope exit. Handy
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* for doing ad-hoc clean-up tasks in a function with multiple returns.
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*
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* Example usage:
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* \code
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* const int saved_val = g_foo;
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* g_foo = 55;
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* SCOPE_EXIT({ g_foo = saved_val; });
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*
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* if (Bar()) {
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* return 0;
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* } else {
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* return 20;
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* }
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* \endcode
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*/
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#define SCOPE_EXIT(body) auto CONCAT2(scope_exit_helper_, __LINE__) = detail::ScopeExit([&]() body)
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/**
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* This macro is similar to SCOPE_EXIT, except the object is caller managed. This is intended to be
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* used when the caller might want to cancel the ScopeExit.
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*/
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#define SCOPE_GUARD(body) detail::ScopeExit([&]() body)
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