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 2024. The current version is 1.90.0.

http::basic_fields::set (4 of 4 overloads)

void
set(
    string_view,
    std::nullptr_t) = delete;