introspectable.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,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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 **********************************************************************/
 
#pragma once
 
#include <functional>
#include <QHash>
#include <QMetaType>
#include <QVariantMap>
#include "xpcconfig.h"
 
namespace LC
{
namespace Util
{
    using Introspect_f = std::function<QVariantMap (QVariant)>;
 
    class UTIL_XPC_API Introspectable
    {
        QHash<int, Introspect_f> Intros_;
 
        Introspectable () = default;
    public:
        Introspectable (const Introspectable&) = delete;
        Introspectable& operator= (const Introspectable&) = delete;
 
        static Introspectable& Instance ();
 
        template<typename T, typename U>
        void Register (const U& intro, std::result_of_t<U (QVariant)>* = nullptr)
        {
            const auto id = qMetaTypeId<T> ();
            Intros_ [id] = intro;
        }
 
        template<typename T, typename U>
        void Register (const U& intro, std::result_of_t<U (T)>* = nullptr)
        {
            Register<T> ([intro] (const QVariant& var) { return std::invoke (intro, var.value<T> ()); });
        }
 
        template<typename T>
        QVariantMap operator() (const T& t) const
        {
            return (*this) (QVariant::fromValue<T> (t));
        }
 
        QVariantMap operator() (const QVariant&) const;
    };
}
}