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 version of Boost is under active development. You are currently in the master branch. The current version is 1.90.0.

value::is_null

`value::is_null`

Check if this is a null value.

bool
is_null() const noexcept;

Returns true if the value’s kind() is kind::null.

Constant.

No-throw guarantee.

this->kind() == kind::null.