Prepared genetic functions and renamed class and struct for a more fitting name

src/chess.cpp

@@ -1,4 +1,5 @@
 #include "chess.hpp"
+#include <cstdlib>
 #include <iostream>
 #include <random>
 
@@ -15,30 +16,32 @@ int GenerateRandomNumber(int generationLimit) {
     return generatedNumber;
 }
 
-GeneticDefaults::GeneticDefaults(void) {
-    size = 4;
+GeneticRules::GeneticRules(void) {
+    boardSize = 4;
+    populationSize = 1;
 }
 
-GeneticDefaults::GeneticDefaults(unsigned int size) {
-    this->size = size;
+GeneticRules::GeneticRules(unsigned int boardSize, unsigned int populationSize) {
+    this->boardSize = boardSize;
+    this->populationSize = populationSize;
 }
 
-GeneticChess::GeneticChess(void) {
+Individual::Individual(const unsigned int boardSize) {
     generationCount = 0;
     InitializeGenerator();
     // population init part of vector resize
-    board.resize(genetics.size, 0);
+    board.resize(boardSize, 0);
     for (int i = 0; i < board.size(); ++i) { 
-        board.at(i) = GenerateRandomNumber(genetics.size);
+        board.at(i) = GenerateRandomNumber(boardSize);
     }
 }
 
 
-void GeneticChess::Print(void) {
+void Individual::Print(void) {
     std::cout << generationCount << ':' << std::endl;
     for (int i : board) {
         std::cout << '[';
-        for (int j = 0; j < genetics.size; ++j) {
+        for (int j = 0; j < board.size(); ++j) {
             if (j == i) { std::cout << "Q"; }
             else { std::cout << ' '; }
         }
@@ -48,7 +51,7 @@ void GeneticChess::Print(void) {
 }
 
 // Gets the fitness of the population
-unsigned int GeneticChess::GetFitness(void) {
+unsigned int Individual::GetFitness(void) {
     unsigned int fitness = 0;
     for (unsigned int i : board) { 
         if (!IsQueenThreatened(i)) { fitness++; }
@@ -58,29 +61,101 @@ unsigned int GeneticChess::GetFitness(void) {
 }
 
 //
-void GeneticChess::Selection(void) {
+void Individual::Selection(void) {
+    /* TODO: Finish selection
+    int fitness[N] = {0};
+    int fitness_sum = 0;
+    int i, j;
+    // get fitness for all members of population
+    for ( i=0; i<N; i++ ){
+        fitness[i] = get_fitness(population[i]);
+        fitness_sum += fitness[i];
+    }
 
+
+    // this is simple fitness proportional selection
+    // (roulette wheel sampling)
+    int roll;
+    int temp_sum = 0;
+    int selection;
+    for ( i=0; i<N; i++ ){
+        temp_sum = 0;
+        roll = rand()%fitness_sum;
+        for ( j=0; j<N; j++ ){
+            temp_sum += fitness[j];
+            if ( roll < temp_sum ){
+                selection = j;
+                break;
+            }
+        }
+        selected[i] = selection;
+    }
+    */
 }
 
 // Crossover on the population
-void GeneticChess::Crossover(void) {
+void Individual::Crossover(void) {
+    /* TODO: Finish Crossover 
+    double crossover_roll;
+    int crossover_locus;
+    int i;
+    unsigned char temp1;
+    unsigned char temp2;
+    unsigned char mask;
+    unsigned char temp_population[N];
 
+    for ( i=0; i<N; i+=2){ 
+        crossover_roll = ((double)rand())/((double)RAND_MAX);
+        temp1 = 0;
+        temp2 = 0;
+        if(crossover_roll <= P_c){  //crossover
+            crossover_locus = rand()%L;
+            mask = get_mask(crossover_locus);
+            temp1 = population[selected[i]] & mask;
+            temp1 ^= population[selected[i+1]] & ~mask;
+            temp2 = population[selected[i+1]] & mask;
+            temp2 ^= population[selected[i]] & ~mask;
+            temp_population[i] = temp1;
+            temp_population[i+1] = temp2;
+        }
+        else{  //clone
+            temp_population[i] = population[selected[i]];
+            temp_population[i+1] = population[selected[i+1]];
+        }
+    }
+
+    //copy back to population
+    for ( i=0; i<N; i++ ){
+        population[i] = temp_population[i];
+    }
+    */
 }
 
 // Mutates the population
-void GeneticChess::Mutation(void) {
-
+void Individual::Mutation(void) {
+    /* TODO: Finish Mutation
+    double mutation_roll;
+    int i, j;
+    for ( i=0; i<N; i++){
+        for ( j=0; j<L; j++ ){
+            mutation_roll = ((double)rand())/((double)RAND_MAX);
+            if ( mutation_roll <= P_m ){
+                population[i] ^= (1<<j);   //toggle bit
+            }
+        }
+    }
+    */
 }
 
 // Checks if the passed in queen is threatened on the board
 // Impossible for queens to be threatened by same row
-bool GeneticChess::IsQueenThreatened(const unsigned int queenRow) {
+bool Individual::IsQueenThreatened(const int queenRow) {
     int queenCol = board.at(queenRow);
     int diffRow, diffCol;
-    for (int i = 0; i < genetics.size; ++i) {
-        if (i == queenRow) { continue; }
-        diffCol = queenCol - board.at(i);
-        diffRow = queenRow - i;
+    for (int row = 0; row < board.size(); ++row) {
+        if (row == queenRow) { continue; }
+        diffCol = abs(queenCol - (int)board.at(row));
+        diffRow = abs(queenRow - row);
         if (diffCol == 0) { return true; } // Column threat
         if (diffCol == diffRow) { return true; }
     }

src/chess.hpp

@@ -6,28 +6,28 @@
 void InitializeGenerator(void);
 int GenerateRandomNumber(int generationLimit);
 
-struct GeneticDefaults {
+struct GeneticRules {
     const float kProbabilityCrossover = 0.7;        //crossover probability (typical val.)
     const float kProbabilityMutation = 0.001;       //mutation probability  (typical val.)
     const unsigned int generationLimit = 10000;     //number of generations (something huge)
-    unsigned int size;                          //population size (change to something even)
-    GeneticDefaults(void);
-    GeneticDefaults(unsigned int size); //custom generation sizes
+    unsigned int boardSize;                         //board size
+    unsigned int populationSize;                    //population size (change to something even)
+    GeneticRules(void);
+    GeneticRules(unsigned int boardSize, unsigned int populationSize); //custom generation sizes
 };
 
-class GeneticChess {
+class Individual {
 public:
     std::vector<unsigned int> board;
-    GeneticDefaults genetics;
     int generationCount;
-    GeneticChess(void);
+    Individual(const unsigned int boardSize);
     void Print(void);
     unsigned int GetFitness(void);
     void Selection(void);
     void Crossover(void);
     void Mutation(void);
 private:
-    bool IsQueenThreatened(const unsigned int queenRow);
+    bool IsQueenThreatened(const int queenRow);
 };
 
 #endif // CHESS_HPP

src/n_queens.cpp

@@ -1,13 +1,13 @@
 #include "chess.hpp"
 #include "genetic_algorithm.hpp"
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
+#include <vector>
 
-int main(){
-    GeneticChess population;
-    population.Print();
-    population.GetFitness();
+int main() {
+    GeneticRules genetics;
+    std::vector<Individual> population;
+    Individual person(genetics.boardSize);
+    person.Print();
+    person.GetFitness();
 
     /*
     unsigned char population[N] = {0};