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.

field_view::is_null

Returns whether this field_view points to a NULL value.

constexpr bool
is_null() const noexcept;

No-throw guarantee.