gene.cpp

来自「这是遗传算法的源代码」· C++ 代码 · 共 60 行

// -*- c++ -*-
//
//  File:         gene.cpp
//
//  Description:  C++ implementation for the class gene.
//                A gene stores an allele, 0 or 1.
//
//  Author:       Fernando Lobo
//
//  Date:         June/1999
//
//  Extended to deal with chi-ary problems by Luis de la Ossa
//  GCC 3.4 and 4 series compliance by Kumara Sastry 
//
//  Date:         March/2006

#include <assert.h>
#include <iostream>
#include "gene.hpp"
#include "parameter.hpp"
#include "random.hpp"      // random number generator

extern randomG RANDOM; 

// generate an allele randomly
void gene::random(int position)
{ 		
  Allele = RANDOM.uniform(0,parameter::ranges[position]-1);
}

// print the gene
std::ostream &operator<< (std::ostream &out, const gene &g)
{
  out << g.Allele; 
  return out;
}

// assignment operator: gene = gene
gene & gene::operator=(const gene &g)
{
  if (this== &g) return *this;
  Allele = g.Allele;
  return *this;
}

// assignment operator: gene = int
gene & gene::operator=(const int v)
{
  Allele = v;
  return *this;
}

// changes allele

void gene::mutate(int position)
{
  // the operation ensures the change in the allele without using any loop.	
  Allele = (Allele + RANDOM.uniform(1,parameter::ranges[position]-1)) % parameter::ranges[position];
}