eithercont.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#pragma once
 
#include <functional>
 
namespace LC
{
namespace Util
{
    template<typename LeftSig, typename RightSig>
    class EitherCont
    {
        using Left_f = std::function<LeftSig>;
        using Right_f = std::function<RightSig>;
        Left_f Left_;
        Right_f Right_;
    public:
        EitherCont () = default;
 
        template<typename L, typename R>
        EitherCont (const L& l, const R& r)
        : Left_ { l }
        , Right_ { r }
        {
        }
 
        explicit operator bool () const
        {
            return Left_ && Right_;
        }
 
        template<typename... Args>
        auto Left (Args&&... args) const
        {
            return Left_ (std::forward<Args> (args)...);
        }
 
        template<typename... Args>
        auto Right (Args&&... args) const
        {
            return Right_ (std::forward<Args> (args)...);
        }
    };
}
}