face@debian:~/eva$ cat individuals.cpp
#include "individuals.h"
#include <time.h>
#include <stdlib.h>

int individual::size;

individual::individual(int *_size)
{
    gene=new int[*_size];
    size=*_size;
...


face@debian:~/eva$ cat individuals.h
#ifndef INDIVIDUALS_H
#define INDIVIDUALS_H

class individual
{
    public:
        individual(int *_size);
        individual(int *_size, bool randomly);
        ~individual();
        individual* recombination(individual *ind1, individual *ind2);
        individual* operator=(individual &ind);
        void mutation();
        const static int number_of_colors=4;
    private:
        static int size;
        int *gene;
};

#endif