The part where it references what someone else wrote is the 'of C++' part. The C++ language standard describes the standard library. The OpenMP enhancements are

The part where it references what someone else wrote is the 'of C++' part. The C++ language standard describes the standard library. The OpenMP enhancements aren't actually required (the code will compile as standard C++). As such, it's pretty pure C++ really and anyone who writes the language commonly will understand what is meant.