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

string::back

`string::back`

Return the last character.

char&
back(); (1)

char const&
back() const; (2)

Returns a reference to the last character.

! empty()

Constant.