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

This is the documentation for a snapshot of the master branch, built from commit a2b80500d6.

Access the first element.

value&&
front() && noexcept;

Returns a reference to the first element.

not empty()

Constant.