A weird expression in c++ - what does this mean? -

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i've seen code finding minor of matrix:

regmatrix regmatrix::minor(const int row, const int col)const{   //printf("minor(row=%i, col=%i), rows=%i, cols=%i\n", row, col, rows, cols);  assert((row >= 0) && (row < numrow) && (col >= 0) && (col < numcol));   regmatrix result(numrow-1,numcol-1);   // copy content of matrix minor, except selected     (int r = 0; r < (numrow - (row >= numrow)); r++){   (int c = 0; c < (numcol - (col > numcol)); c++){    //printf("r=%i, c=%i, value=%f, rr=%i, cc=%i \n", r, c, p[r-1][c-1], r - (r > row), c - (c > col));    result.setelement(r - (r > row), c - (c > col),_matrix[r-1][c-1]);   }  }      return result; }

this first time encounter code line this: r < (numrow - (row >= numrow)).

what mean?

(row >= numrow) boolean expression. if operator>= has not been overloaded, should evaluate true if row greater or equal numrow, , false otherwise. when casting boolean integer subtraction, become 1 if true, 0 else.


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