80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
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// SPDX-FileCopyrightText: 2014 Citra Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <utility>
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namespace detail {
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template <class F>
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class ScopeGuard {
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private:
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F f;
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bool active;
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public:
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constexpr ScopeGuard(F f_) : f(std::move(f_)), active(true) {}
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constexpr ~ScopeGuard() {
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if (active) {
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f();
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}
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}
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constexpr void Cancel() {
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active = false;
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}
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constexpr ScopeGuard(ScopeGuard&& rhs) : f(std::move(rhs.f)), active(rhs.active) {
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rhs.Cancel();
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}
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ScopeGuard& operator=(ScopeGuard&& rhs) = delete;
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};
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template <class F>
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constexpr ScopeGuard<F> MakeScopeGuard(F f) {
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return ScopeGuard<F>(std::move(f));
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}
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enum class ScopeGuardOnExit {};
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template <typename F>
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constexpr ScopeGuard<F> operator+(ScopeGuardOnExit, F&& f) {
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return ScopeGuard<F>(std::forward<F>(f));
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}
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} // namespace detail
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#define CONCATENATE_IMPL(s1, s2) s1##s2
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#define CONCATENATE(s1, s2) CONCATENATE_IMPL(s1, s2)
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#ifdef __COUNTER__
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#define ANONYMOUS_VARIABLE(pref) CONCATENATE(pref, __COUNTER__)
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#else
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#define ANONYMOUS_VARIABLE(pref) CONCATENATE(pref, __LINE__)
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#endif
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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 detail::ScopeGuardOnExit() + [&]()
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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 auto ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE_) = SCOPE_GUARD
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