foo.cc: In function 'int main()':
foo.cc:17:9: error: invalid operands of types 'int' and '__gnu_cxx::__promote_2<int, int, double, double>::__type' {aka 'double'} to binary 'operator%'
   17 |   if (i % (pow(2, x + 1) - 1) == 0) {
      |       ~ ^ ~~~~~~~~~~~~~~~~~~~
      |       |                  |
      |       int                __gnu_cxx::__promote_2<int, int, double, double>::__type {aka double}

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