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 682d8fbea2.

Return a character with bounds checking.

char const&
at(
    std::size_t pos) const;

Returns a reference to the character specified at location pos.

Constant.

Strong guarantee.

Name	Description
`pos`	A zero-based index to access.

Type	Thrown On
boost::system::system_error	`pos >= size()`.