Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Clear the contents.

constexpr void
clear();

Erases all characters from the string. After this call, size() returns zero.

Linear in size().

All references, pointers, or iterators referring to contained elements are invalidated. Any past-the-end iterators are also invalidated.