utils.h

//
// 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));
}