Code shared from run.dlang.io.

main.d

import std.stdio, std.format;
import std.algorithm;

struct BoolMatrix(int n)
{
  bool[n][n] elements;
  
  enum err1 = n.format!"Point, %s'e denk veya fazla olamaz!";
  
  ref opCall(Point i)
  in(i.y <n && i.x <n, err1)
    => elements[i.y][i.x];
  
  alias toSink = void delegate(in char[]);
  
  void toString(scope toSink sink) const
  {
    sink.formattedWrite!"%-(%-(%s %)\n%)"(
      elements[].map!(
        (ref row) => 
          row[].map!(
            col => col ? '1' : '0'
          )
       )
    );
  }
}

struct Point { int x, y; }

void main() {
  BoolMatrix!5 arr;
  auto p = Point(2, 2);

  arr(p) = true;
  arr.writeln;
}