I've got this file where it seems to be an undefined reference but I don't know why, everything it seems correct to me. Someone can help me?
This is the error:
g++ -c driver.cpp -std=c++11 -pedantic -Wall
g++ -o driver driver.o
/usr/bin/ld: driver.o: in function `main':
driver.cpp:(.text+0x23): undefined reference to `TicTacToe::TicTacToe()'
/usr/bin/ld: driver.cpp:(.text+0x2f): undefined reference to `TicTacToe::makeMove()'
collect2: error: ld returned 1 exit status
make: *** [makefile:2: driver] Error 1
And these are the files I'm using:
The driver program:
// driver.cpp: use of TicTacToe class
#include "TicTacToe.h" // include definition of class TicTacToe
int main() {
TicTacToe g; // creates object g of class TicTacToe
g.makeMove(); // invokes function makeMove
}
This is the class:
// TicTacToe.h
#ifndef TICTACTOE_H
#define TICTACTOE_H
#include <array>
class TicTacToe {
private:
enum Status {WIN, DRAW, CONTINUE}; // enumeration constants
std::array<std::array<int, 3>, 3> board;
public:
TicTacToe(); // default constructor
void makeMove(); // make move
void printBoard() const; // print board
bool validMove(int, int) const; // validate move
bool xoMove(int); // x o move
Status gameStatus() const; // game status
};
#endif
These are the class function members:
// TicTacToe.cpp
// Member-function defnitions for class TicTacToe.
#include <iostream>
#include <iomanip>
#include "TicTacToe.h" // include definition of class TicTacToe
using std::cout;
using std::cin;
using std::setw;
TicTacToe::TicTacToe() {
for (int j{0}; j < 3; ++j) { // initialize board
for (int k{0}; k < 3; ++k) {
board[j][k] = ' ';
}
}
}
void TicTacToe::makeMove() {
printBoard();
while (true) {
if (xoMove('X')) {
break;
}
else if (xoMove('O')) {
break;
}
}
}
void TicTacToe::printBoard() const {
cout << " 0 1 2\n\n";
for (int r{0}; r < 3; ++r) {
cout << r;
for (int c = 0; c < 3; ++r) {
cout << setw(3) << static_cast< char > (board[r][c]);
if (c != 2) {
cout << " |";
}
}
if (r != 2) {
cout << "\n ____|____|____\n | | \n";
}
}
cout << "\n\n";
}
bool TicTacToe::xoMove(int symbol) {
int x;
int y;
do {
cout << "Player " << static_cast<char>(symbol) << " enter move: ";
cin >> x >> y;
cout << '\n';
} while (!validMove(x, y));
board[x][y] = symbol;
printBoard();
Status xoStatus = gameStatus();
if (xoStatus == WIN) {
cout << "Player " << static_cast<char>(symbol) << " wins!\n";
return true;
}
else if (xoStatus == DRAW) {
cout << "Game is draw.\n";
return true;
}
else { // CONTINUE
return false;
}
}
bool TicTacToe::validMove(int r, int c) const {
return r >= 0 && r < 3 && c >= 0 && c < 3 && board[r][c] == ' ';
}
// must specify that type Status is part of the TicTacToe class.
TicTacToe::Status TicTacToe::gameStatus() const {
// check for a win on diagonals
if (board[0][0] != ' ' && board[0][0] == board[1][1] && board[0][0] == board[2][2]) {
return WIN;
}
else if (board[2][0] != ' ' && board[2][0] == board[1][1] && board[2][0] == board[0][2]) {
return WIN;
}
// check for win in rows
for (int a{0}; a < 3; ++a) {
if (board[a][0] != ' ' && board[a][0] == board[a][1] && board[a][0] == board[a][2]) {
return WIN;
}
}
// check for win in columns
for (int a{0}; a < 3; ++a) {
if (board[0][a] != ' ' && board[0][a] == board[1][a] && board[0][a] == board[2][a]) {
return WIN;
}
}
// check for a completed game
for (int r{0}; r < 3; ++r) {
for (int c{0}; c < 3; ++c) {
if (board[r][c] == ' ') {
return CONTINUE; // game is not finished
}
}
}
return DRAW; // game is a draw
}
It's probably something stupid but I don't know what I have to look for.
