Object.hpp

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/*
 * Copyright (C) 2025  Tetex7
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
//
// Created by tete on 05/13/2025.
//
#pragma once
 
#ifndef L61_OBJECT_HPP
#define L61_OBJECT_HPP
 
#include <string>
#include <type_traits>
#include <utility>
#include <typeinfo>
#include <format>
#include "json.hpp"
 
namespace l61
{
    class Object;
 
    namespace meta
    {
        template<class T>
        concept l61Obj = std::derived_from<std::remove_cvref_t<T>, Object>;
 
        template<class T>
        concept l61ObjPtr = std::derived_from<Object, std::remove_pointer_t<T>>;
    }
 
    class Object
    {
    public:
        virtual ~Object() = default;

        virtual std::string toString() const;

        virtual std::size_t hashCode() const;

        std::string typeName() const;

        const std::type_info& typeInfo() const;

        virtual nlohmann::json toJsonValue() const;

        explicit operator std::string() const;

        explicit operator nlohmann::json() const;
    };
 
    namespace meta
    {
        template<l61Obj T, l61Obj Ty>
        bool instanceof(const Ty& value)
        {
            return dynamic_cast<const T*>(&value) != nullptr;
        }

        template<l61Obj T, l61Obj Ty>
        bool exact_instanceof(const Ty& value)
        {
            return typeid(T) == value.typeInfo();
        }
 

        template<l61Obj T, l61Obj Ty>
        constexpr bool static_instanceof(const Ty&)
        {
            return std::derived_from<Ty, std::type_identity_t<T>>;
        }
    }
}
 
template <l61::meta::l61Obj T>
struct nlohmann::adl_serializer<T>
{
    static void to_json(json& j, const T& obj) {
        if (obj)
        {
            j = obj.toJsonValue();
        }
        else
        {
            j = nullptr;
        }
    }
};
 
template <l61::meta::l61Obj T>
struct std::formatter<T> : formatter<std::string> {
    auto format(const T& obj, std::format_context& ctx) const {
        return std::formatter<std::string>::format(
            static_cast<const l61::Object&>(obj).toString(),
            ctx
        );
    }
};
 
template <l61::meta::l61Obj T>
struct std::hash<T>
{
    std::size_t operator()(const T& obj) const noexcept
    {
        return obj.hashCode();
    }
};
 
#endif //L61_OBJECT_HPP