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 2023. The current version is 1.91.0.

ipv4_address::bytes_type

The type used to represent an address as an array of bytes.

using bytes_type = std::array< unsigned char, 4 >;