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 1.89.0.

test::stream::read_size

Set the maximum number of bytes returned by read_some.

void
read_size(
    std::size_t n);