how would I access attributes of a class, from within another class - c++

Question

I am coding a terminal based game in c++ using the ncurses library, and I would like the enemy class to be able to access the players location which I can access from within my main function using p->yLoc and p->xLoc, however, I cannot access these variables from within my enemy::move function, as it just returns the error p was not declared in this scope.
Here is my code:
enemy.h:
#ifndef _ENEMY_H_
#define _ENEMY_H_
#include "player.h"
#include <unistd.h>
void Enemy::move(){
int playerY, playerX;
int yMv, xMv;
while (1){
playerY = p->yLoc;
playerX = p->xLoc;
if (playerY > yLoc) {
mvdown();
} else if (playerY < yLoc) {
mvup();
}
if (playerX > xLoc){
mvright();
} else if (playerX < xLoc) {
mvleft();
}
sleep(1);
}
}
player.h
#ifndef _PLAYER_H_
#define _PLAYER_H_
class Player {
public:
Player(WINDOW * win, int y, int x, char c);
void mvup();
void mvdown();
void mvleft();
void mvright();
int getmv();
void display();
int xLoc, yLoc, xMax, yMax;
private:
char character;
WINDOW * curwin;
};
Player::Player(WINDOW * win, int y, int x, char c){
curwin = win;
yLoc = y;
xLoc = x;
getmaxyx(curwin, yMax, xMax);
keypad(curwin, true);
character = c;
}
main.cpp
#include <ncurses.h>
#include "player.h"
#include <string>
#include <ctime>
#include <cstdlib>
#include "enemy.h"
#include <thread>
using namespace std; // I understand this is bad practice
int main(){
// starts ncurses
initscr();
noecho();
cbreak();
int yMax, xMax;
getmaxyx(stdscr, yMax, xMax);
WINDOW * playwin = newwin(20, 50, (yMax/2)-10, 10);
box(playwin, 0, 0);
refresh();
wrefresh(playwin);
if (nodelay (playwin, 1) == ERR) {
// an error has occurred
}
Player * p = new Player(playwin, 1, 1, '#'); // params: (window to display in, starting y, starting x, character to display)
Enemy * e = new Enemy(playwin, 10, 10, 'x'); // same here
thread enemyLoop(&Enemy::move, e); // start the movement for the enemy in a different thread
while(p->getmv() != 'x'){ // leave the game with the key x
// updates the location of the two sprites, and refreshes the window.
p->display();
e->display();
wrefresh(playwin);
}
endwin();
return 0;
}

Answer 1

If Enemy::move is supposed to know about the other players location then you have to pass the player as argument:
void Enemy::move(const Player &p)
e->move(*p);
Then the function can access the players position.
Note: why are you allocating the player and enemy on the heap. there really is no need for that.