bitmap

[shotjase]

i have a file here with all my constructors but i sitll have a problem..it wont compile and i have no idea y..

using namespace std;

bitmap::bitmap()
{
//vector < vector <bool> > g;
numrows = 1;
numcols = 1;
grid.resize(numrows, vector <bool> (numcols,false));

}

void bitmap::display() const
{
for (int r = 0; r < numrows; r++)
{
for (int c = 0; c < numcols; c++)
{
if (grid[r][c] == 0)
cout << " " ;

else cout << "*";
}
cout << endl;


}

}

int bitmap::getRows() const
{
return numrows;
}

int bitmap::getCols() const
{
return numcols;
}

void bitmap::save (string filename) const
{
ofstream infile(filename.c_str());
if (infile.is_open())
{
infile << numrows;
infile << numcols;
for (int r = 0; r < numrows; r++)
{
for (int c = 0; c < numcols; c++)
{
infile << grid[r][c];
}
}
}
else
{
cout <<"Failed to open file" << cout;
}
infile.close();
}

void bitmap::read (string filename)
{

ifstream infile;
infile.open(filename.c_str());
if (infile.fail())
{
cout << "Invalid filename " << endl;

}
if (infile >> numrows >> numcols)
{
grid.resize(numrows, vector <bool> (numcols,false));
char ch;
for (int r = 0; r < numrows; r++)
for (int c = 0; c < numcols; c++)
{
infile >> ch;
grid[r][c] = (ch!= '0');
}
}
}


void bitmap::invert()
{
for (int r = 0; r < numrows; r++)
{
for (int c = 0; c < numcols; c++)
{
if (grid[r][c] = 1)
{
grid[r][c] = 0;
}
else{
grid[r][c] = 1;
}
}
}
}

void bitmap::magnify()
{
//The image is doubled both vertically and horizontally.
}

void bitmap::rotate()
{
//The image is rotated 90 degress clockwise. Note that 4 rotations should return to the original image.
}


can anyone see any problems in my code??