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 readable and writable bytes to zero.

void
clear();

This function causes the readable and writable bytes to become empty. The capacity is not changed.

Buffer sequences previously obtained using data or prepare become invalid.

No-throw guarantee.