foo.cc: In function ‘int main()’:
foo.cc:12:29: error: expected ‘)’ before ‘(’ token
   12 | m = (int )malloc(sizeof(int)(n));
      |                 ~           ^
      |                             )
foo.cc:12:5: error: cast from ‘void*’ to ‘int’ loses precision [-fpermissive]
   12 | m = (int )malloc(sizeof(int)(n));
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:12:5: error: invalid conversion from ‘int’ to ‘int*’ [-fpermissive]
   12 | m = (int )malloc(sizeof(int)(n));
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~
      |     |
      |     int