unique_id.h

// =====================================================================================================================
//  open-cpp-utils, an open-source cpp library with data structures that extend the STL.
//  Copyright (C) 2024  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 OPEN_CPP_UTILS_UNIQUE_ID_H
#define OPEN_CPP_UTILS_UNIQUE_ID_H
 
#include <cstdint>
 
namespace open_cpp_utils
{
 
// Internal function for incrementing an id associated with a type
template<typename Base> uint64_t _increment_id()
{
    static uint64_t current = 0;
    return current++;
}
 
template<typename Base, typename Type> uint64_t unique_id()
{
    static bool initialized = false;
    static uint64_t id = 0;
 
    if(initialized) return id;
    initialized = true;
    return id = _increment_id<Base>();
}
 
}
 
#endif // OPEN_CPP_UTILS_UNIQUE_ID_H