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 51f865ba76.

The type of keys.

using key_type = string_view;

The function string::max_size returns the maximum allowed size of strings used as keys.