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utils.h
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utils.h
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//
// Created by System Administrator on 16/8/14.
//
#pragma once
#include <utility>
// Copy from gsl
// final_act allows you to ensure something gets run at the end of a scope
template <class F>
class final_act
{
public:
explicit final_act(F f) noexcept : f_(std::move(f)), invoke_(true) {}
final_act(final_act&& other) noexcept : f_(std::move(other.f_)), invoke_(other.invoke_)
{
other.invoke_ = false;
}
final_act(const final_act&) = delete;
final_act& operator=(const final_act&) = delete;
~final_act() noexcept
{
if (invoke_) f_();
}
private:
F f_;
bool invoke_;
};
// finally() - convenience function to generate a final_act
template <class F>
inline final_act<F> finally(const F& f) noexcept
{
return final_act<F>(f);
}
template <class F>
inline final_act<F> finally(F&& f) noexcept
{
return final_act<F>(std::forward<F>(f));
}