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 a character.

constexpr reference
operator[](
    size_type pos);

Returns a reference to the character at index pos.

Constant.

pos >= size

Name	Description
`pos`	The index to access.