Detect Valgrind in source code

CPP code to detect valgrind without valgrind headers. Use Valgrind long double processing.

/* TAMARA detection Valgrin by Igor Mega */
#include <iostream>

int main(){
  if(std::to_string(static_cast<long double>(9223372036854775800LL)).compare(
      "9223372036854775800.000000") != 0)
    std::cout << "Running in Valgrind mode…" << std::endl;
  else  std::cout << "Valgrind not detected…" << std::endl;
}