scope_exit.hpp

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/// \file jsonv/detail/scope_exit.hpp
/// Definition of the \c on_scope_exit utility.
///
/// Copyright (c) 2015 by Travis Gockel. All rights reserved.
///
/// This program is free software: you can redistribute it and/or modify it under the terms of the Apache License
/// as published by the Apache Software Foundation, either version 2 of the License, or (at your option) any later
/// version.
///
/// \author Travis Gockel (travis@gockelhut.com)
#pragma once
 
#include <jsonv/config.hpp>
 
#include <type_traits>
#include <utility>
 
namespace jsonv::detail
{
 
template <typename Function>
class scope_exit_invoker
{
public:
    explicit scope_exit_invoker(Function&& func) :
            _func(std::move(func)),
            _responsible(true)
    { }
 
    scope_exit_invoker(scope_exit_invoker&& src) noexcept(std::is_nothrow_move_constructible_v<Function>) :
            _func(std::move(src._func)),
            _responsible(src._responsible)
    {
        src._responsible = false;
    }
 
    scope_exit_invoker(const scope_exit_invoker&) = delete;
    scope_exit_invoker& operator=(const scope_exit_invoker&) = delete;
    scope_exit_invoker& operator=(scope_exit_invoker&&) = delete;
 
    ~scope_exit_invoker()
    {
        if (_responsible)
            _func();
    }
 
    void release()
    {
        _responsible = false;
    }
 
private:
    Function _func;
    bool     _responsible;
};
 
template <typename Function>
JSONV_NODISCARD
scope_exit_invoker<Function> on_scope_exit(Function func)
{
    return scope_exit_invoker<Function>(std::move(func));
}
 
}