ant-gene-frequency-table.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code 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.
 *
 * Antkeeper source code 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 Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_GAME_ANT_GENE_FREQUENCY_TABLE_HPP
#define ANTKEEPER_GAME_ANT_GENE_FREQUENCY_TABLE_HPP
 
#include <random>
#include <vector>
#include <memory>
    
template <class T>
struct ant_gene_frequency_table
{
    std::vector<std::shared_ptr<T>> genes;
    
    std::vector<float> weights;
    
    template <class URBG>
    [[nodiscard]] std::shared_ptr<T> sample(URBG& urbg) const
    {
        if (genes.empty())
        {
            return nullptr;
        }
        
        std::discrete_distribution<std::size_t> distribution(weights.begin(), weights.end());
        
        return genes[distribution(urbg)];
    }
};
 
#endif // ANTKEEPER_GAME_ANT_GENE_FREQUENCY_TABLE_HPP