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 an older version of Boost and was released in 2018. The current version is 1.92.0.

static_string::insert (6 of 11 overloads)

iterator
insert(
    const_iterator pos,
    CharT ch);