singleton.h

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// =====================================================================================================================
//  fennec, a free and open source game engine
//  Copyright © 2025  Medusa Slockbower
//
//  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/>.
// =====================================================================================================================
 
 
#ifndef FENNEC_RTTI_SINGLETON_H
#define FENNEC_RTTI_SINGLETON_H
 
namespace fennec
{
 
template<typename T>
struct singleton {
    static T& instance() requires(is_pointer_v<T>) {
        static T instance = nullptr;
        return instance;
    }
 
    static T& instance() requires(is_default_constructible_v<T> and not is_pointer_v<T>) {
        static T instance;
        return instance;
    }
};
 
}
 
#endif // FENNEC_RTTI_SINGLETON_H