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 develop branch, built from commit 19f4a39232.

Access a character with bounds checking.

constexpr reference
at(
    size_type pos);

Returns a reference to the character at index pos.

Constant.

Strong guarantee.

Name	Description
`pos`	The index to access.

Type	Thrown On
`std::out_of_range`	`pos >= size()`