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 6ec3fdb23a.

Access a character with bounds checking.

constexpr reference
at(
    size_type pos);
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constexpr const_reference
at(
    size_type pos) const;
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