C++- Why is it telling me in this code, that the variable grid (which is declared in class board) is undefined when I refer to it in a function that is in class creature(creature is a friend class to board so should be able to use its variables) Here are the two errors I don't understand: The code is below them. Thank you

Error 1- On line 141 (the start of the void ant::breed function) I'm getting the error- 'Use of undeclared identifier-grid'

Error 2- On line 150( grid[x-1][y] = new ant(this,x-1,y);) I'm getting the error- No matching constructor for initialization of 'ant'

I don't understand why Im getting these two errors

Here is the code:

#include

#include

#include

#include

#include

using namespace std;

class board;

class creature;

class ant;

class doodlebug;

class invisible;

//Indicates the integer that represents each creature

const int antInd= 1;

const int doodlebugInd = 2;

const int emptyInd = 3;

int ants = 0;

int doodlebugs = 0;

int empty=0;

//int turnsSurvivedAnts = 0;

//int turnsSurvivedBugs = 0;

//int turnsWithoutFood = 0;

//int turnsStagnant=0;

class board {

friend class creature;

friend class ant;

friend class doodlebug;

friend class invisible;

public:

board();

creature* grid[20][20];

// int** creaturePtr;

// int** createGrid();

void createGrid();

void initialize(int& ants, int& doodlebugs, int& empty);

void simTurn();

void printGrid();

protected:

board* thisBoard;

};

class creature {

friend class board;

public:

creature(): turnsWithoutFood(0), turnsSurvived(0){}

creature(board* boardptr,int x, int y);

void move();

void breed(int x, int y);

void starve(int x, int y);

int getType();

private:

int x,y;

int turnsWithoutFood;

int turnsSurvived;

// creature getCreature();

// creature setCreature();

};

class ant: public creature {

friend class board;

public:

ant(): creature(), turnsSurvived(0){}

private:

int x,y;

ant(board* boardptr, int x,int y);

int getType() {

return 1;

}

int turnsWithoutFood;

int turnsSurvived;

void move();

void breed(int x, int y);

};

class doodlebug: public creature {

friend class board;

public:

doodlebug(): creature(), turnsWithoutFood(0), turnsSurvived(0){}

private:

int turnsWithoutFood;

int turnsSurvived;

doodlebug(board* boardptr, int x, int y);

int getType() {

return 2;

}

void move();

void breed(int x, int y);

void starve(int x, int y);

void eat();

};

class invisible {

friend class board;

private:

invisible(int x, int y);

int getType() {

return 3;

}

};

void board::createGrid() {

srand(time(NULL));

for(int i=0;i<20;i++) {

for(int j=0;j<20;j++) {

grid[i][j]= nullptr;

}

}

}

void board::initialize(int& ants, int& doodlebugs, int& empty) {

while(doodlebugs<100) {

int x = rand()%20;

int y= rand()%20;

creature* thisCreature = grid[x][y];

if(thisCreature->getType() != 2)

delete thisCreature;

thisCreature = new doodlebug(this,x,y);

doodlebugs++;

}

while(ants<5) {

int x = rand()%20;

int y= rand()%20;

creature* thisCreature = grid[x][y];

if(thisCreature == NULL)

delete thisCreature;

thisCreature = new ant(this,x,y);

ants++;

}

}

void ant::breed( int x, int y) {

if(grid[x+1][y]->getType() == 3) {

delete grid[x+1][y];

grid[x+1][y] = new ant(this,x+1,y);

ant thisAnt = grid[x+1][y];

thisAnt.turnsSurvived=0;

ants++;

}

else if(grid[x-1][y]->getType() == 3) {

delete grid[x-1][y];

grid[x-1][y] = new ant(this,x-1,y);

ants++;

ant thisAnt = grid[x-1][y];

thisAnt.turnsSurvived=0;

}

else if(grid[x][y+1]->getType() == 3) {

delete grid[x][y-1];

grid[x][y+1] = new ant(this,x,y+1);

ants++;

ant thisAnt = grid[x][y+1]

thisAnt.turnsSurvived=0;

}

else if(grid[x][y-1]->getType() == 3) {

else if(grid[x][y+1]->getType() == 3) {

delete grid[x][y-1];

grid[x][y-1] = new ant(this,x,y-1);

ants++;

ant thisAnt = grid[x][y-1]

thisAnt.turnsSurvived=0;

}

}

}