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/*
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* Copyright (C) 2020 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_DNA_MUTATE_HPP
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#define ANTKEEPER_DNA_MUTATE_HPP
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#include <algorithm>
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#include <iterator>
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#include <random>
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namespace dna
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{
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/**
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* Applies the given function to a randomly selected element in a range.
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*
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* @param first,last Range of elements to mutate.
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* @param unary_op Unary operation function object that will be applied.
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* @param g Uniform random bit generator.
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* @return Iterator to the mutated element.
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*/
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template <class ForwardIt, class UnaryOperation, class URBG>
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ForwardIt mutate(ForwardIt first, ForwardIt last, UnaryOperation unary_op, URBG&& g);
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/**
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* Applies the given function to a random selection of elements in a range.
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*
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* @param first,last Range of elements to mutate.
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* @param count Number of elements to mutate.
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* @param unary_op Unary operation function object that will be applied.
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* @param g Uniform random bit generator.
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*/
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template <class ForwardIt, class Size, class UnaryOperation, class URBG>
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void mutate_n(ForwardIt first, ForwardIt last, Size count, UnaryOperation unary_op, URBG&& g);
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template <class ForwardIt, class UnaryOperation, class URBG>
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ForwardIt mutate(ForwardIt first, ForwardIt last, UnaryOperation unary_op, URBG&& g)
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{
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typedef typename std::iterator_traits<ForwardIt>::difference_type difference_t;
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std::uniform_int_distribution<difference_t> distribution(0, std::distance(first, last) - 1);
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std::advance(first, distribution(g));
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*first = unary_op(*first);
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return first;
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}
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template <class ForwardIt, class Size, class UnaryOperation, class URBG>
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void mutate_n(ForwardIt first, ForwardIt last, Size count, UnaryOperation unary_op, URBG&& g)
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{
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typedef typename std::iterator_traits<ForwardIt>::difference_type difference_t;
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std::uniform_int_distribution<difference_t> distribution(0, std::distance(first, last) - 1);
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ForwardIt mutation;
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while (count)
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{
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mutation = first;
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std::advance(mutation, distribution(g));
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*mutation = unary_op(*mutation);
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--count;
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}
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}
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} // namespace dna
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#endif // ANTKEEPER_DNA_MUTATE_HPP
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