54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
#pragma once
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#include <type_traits>
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namespace utils
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{
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/*
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* Copied from here: https://github.com/microsoft/GSL/blob/e0880931ae5885eb988d1a8a57acf8bc2b8dacda/include/gsl/util#L57
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*/
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template <class F>
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class final_action
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{
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public:
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static_assert(!std::is_reference<F>::value && !std::is_const<F>::value &&
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!std::is_volatile<F>::value,
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"Final_action should store its callable by value");
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explicit final_action(F f) noexcept : f_(std::move(f))
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{
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}
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final_action(final_action&& other) noexcept
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: f_(std::move(other.f_)), invoke_(std::exchange(other.invoke_, false))
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{
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}
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final_action(const final_action&) = delete;
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final_action& operator=(const final_action&) = delete;
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final_action& operator=(final_action&&) = delete;
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~final_action() noexcept
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{
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if (invoke_) f_();
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}
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// Added by momo5502
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void cancel()
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{
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invoke_ = false;
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}
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private:
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F f_;
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bool invoke_{true};
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};
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template <class F>
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final_action<typename std::remove_cv<typename std::remove_reference<F>::type>::type>
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finally(F&& f) noexcept
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{
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return final_action<typename std::remove_cv<typename std::remove_reference<F>::type>::type>(
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std::forward<F>(f));
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}
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} |