lvalue required as left operand of assignment C++ compilation error - c++

Question

Im trying to build a minesweeper game and i keep getting a compiling error: lvalue required as left operand of assignment. only on these two lines:
#include <iostream>
#include <ctime>
using namespace std;
// ------------------------------------------------------
// class Cell
// represents one grid element in the Minesweeper game
// ------------------------------------------------------
class Cell {
public:
Cell();
void print();
void peek();
void unittest();
void setMined(bool);
bool getMined();
void setAdj(int);
private:
bool covered;
bool marked;
bool mined;
int adjcount;
};
// ------------------------
// functions for class Cell
// ------------------------
Cell::Cell(){
covered = true;
marked = false;
mined = false;
adjcount = 0;
// cout << "Creating a Cell" << endl;
}
void Cell::setAdj(int n){
adjcount = n;
}
bool Cell::getMined(){
return mined;
}
void Cell::setMined(bool b){
mined = b;
}
void Cell::print(){
if (marked) cout << " L ";
else {
if (covered) cout << " ? ";
else{
if (mined) cout << " # ";
else if (adjcount == 0) cout << " _ ";
else cout << " " << adjcount << " ";
}
}
}
void Cell::peek(){
if (mined) cout << " # ";
else if (adjcount == 0) cout << " _ ";
else cout << " " << adjcount << " ";
}
void Cell::unittest(){
print(); cout << endl;
covered = false;
print(); cout << endl;
adjcount = 4;
print(); cout << endl;
mined = true;
print(); cout << endl;
covered = true;
print(); cout << endl;
marked = true;
print(); cout << endl;
}
// -------------------------------------
// class Board
// this class represents a 2 dimensional
// array of Cell objects for the game
// of minesweeper
//--------------------------------------
class Board{
public:
Board();
void print();
void peek();
void adjacencycount();
void mixMined();
private:
static const int rows = 5;
static const int cols = 5;
Cell cells [rows][cols];
int mines;
};
// --------------------------
// functions for class Board
// --------------------------
Board::Board(){
mines = 6;
for(int i = 0; i < 1 ; i++){
for(int j = 0; j < mines; j++){
cells[i][j].setMined(true);
}
}
}
void Board::mixMined(){
int shuffle = 1000;
for(int i = 0; i < shuffle; i++){
int r1 = (rand()%rows);
int c1 = (rand()%cols);
int r2 = (rand()%rows);
int c2 = (rand()%cols);
if(r1 && c1 != r2 && c2){
bool temp = cells[r1][c1].getMined();
cells[r1][c1].getMined() = cells[r2][c2].getMined();
cells[r2][c2].getMined() = temp;
}
}
}
void Board::adjacencycount(){
for( int i = 0; i < rows; i++){
for( int j = 0; j < cols; j++){
if(!cells[i][j].getMined()){
int count = 0;
if (i-1 >= 0 && j-1 >= 0 && cells[i-1][j-1].getMined()) count++;
if (i-1 >= 0 && cells[i-1][j].getMined()) count++;
if (i-1 >= 0 && j+1 <= cols-1 && cells[i-1][j+1].getMined()) count++;
if (j-1 >= 0 && cells[i][j-1].getMined()) count++;
if (j+1 <= cols-1 && cells[i][j+1].getMined()) count++;
if (i+1 <= rows-1 && j-1 >= 0 && cells[i+1][j-1].getMined()) count++;
if (i+1 <= rows-1 && cells[i+1][j].getMined()) count++;
if (i+1 <= rows-1 && j+1 <= cols-1 && cells[i+1][j+1].getMined()) count++;
cells[i][j].setAdj(count);
// cout << count; -- for testing purposes
}
}
}
}
void Board::print(){
for (int i = 0; i < rows; i++){
for (int j = 0; j < cols; j++){
cells[i][j].print();
}
cout << endl << endl;
}
}
void Board::peek(){
for (int i = 0; i < rows; i++){
for (int j = 0; j < cols; j++){
cells[i][j].peek();
}
cout << endl << endl;
}
}
// -------------------------
// main function for testing
// -------------------------
int main(void) {
//Cell c;
//c.unittest();
srand(time(0));
Board b;
b.mixMined();
b.adjacencycount();
b.peek();
return 0;
}
I'm trying to get my cells to swap, so that the mines would randomize every new game. Ive searched around and couldn't find a solution to this. I added "==" but that function isn't going to do what i want it to.
++EDIT++ I'm sorry it did state lvalue required, i missed typed that
minesweeper.cpp: In member function ‘void Board::mixMined()’:
minesweeper.cpp:130: error: lvalue required as left operand of assignment
minesweeper.cpp:131: error: lvalue required as left operand of assignment
Thats the error that occurs.

Answer 1

I think getMined() is actually something like this:
bool getMined()
So you are trying to assign to rValue which is not possible
You might want to write some function like:
void setMined(bool m) and the use it like:
cells[r1][c1].setMined( cells[r2][c2].getMined() );