introspectable.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <functional>
#include <QHash>
#include <QMetaType>
#include <QVariantMap>
#include "xpcconfig.h"
 
namespace LC::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)
        {
            if constexpr (std::is_invocable_v<U, QVariant>)
            {
                const auto id = qMetaTypeId<T> ();
                Intros_ [id] = intro;
            }
            else
                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;
    };
}