81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#pragma once
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#include <exception>
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#include <type_traits>
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#include <utility>
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#include "common/macro_util.h"
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namespace Dynarmic::detail {
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struct ScopeExitTag {};
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struct ScopeFailTag {};
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struct ScopeSuccessTag {};
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template <typename Function>
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class ScopeExit final {
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public:
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explicit ScopeExit(Function&& fn) : function(std::move(fn)) {}
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~ScopeExit() noexcept {
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function();
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}
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private:
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Function function;
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};
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template <typename Function>
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class ScopeFail final {
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public:
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explicit ScopeFail(Function&& fn) : function(std::move(fn)), exception_count(std::uncaught_exceptions()) {}
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~ScopeFail() noexcept {
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if (std::uncaught_exceptions() > exception_count) {
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function();
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}
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}
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private:
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Function function;
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int exception_count;
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};
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template <typename Function>
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class ScopeSuccess final {
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public:
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explicit ScopeSuccess(Function&& fn) : function(std::move(fn)), exception_count(std::uncaught_exceptions()) {}
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~ScopeSuccess() {
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if (std::uncaught_exceptions() <= exception_count) {
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function();
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}
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}
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private:
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Function function;
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int exception_count;
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};
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// We use ->* here as it has the highest precedence of the operators we can use.
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template <typename Function>
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auto operator->*(ScopeExitTag, Function&& function) {
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return ScopeExit<std::decay_t<Function>>{std::forward<Function>(function)};
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}
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template <typename Function>
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auto operator->*(ScopeFailTag, Function&& function) {
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return ScopeFail<std::decay_t<Function>>{std::forward<Function>(function)};
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}
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template <typename Function>
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auto operator->*(ScopeSuccessTag, Function&& function) {
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return ScopeSuccess<std::decay_t<Function>>{std::forward<Function>(function)};
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}
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} // namespace Dynarmic::detail
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#define SCOPE_EXIT auto ANONYMOUS_VARIABLE(_SCOPE_EXIT_) = ::Dynarmic::detail::ScopeExitTag{} ->* [&]() noexcept
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#define SCOPE_FAIL auto ANONYMOUS_VARIABLE(_SCOPE_FAIL_) = ::Dynarmic::detail::ScopeFailTag{} ->* [&]() noexcept
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#define SCOPE_SUCCESS auto ANONYMOUS_VARIABLE(_SCOPE_FAIL_) = ::Dynarmic::detail::ScopeSuccessTag{} ->* [&]()
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