Method is_null

include/boost/json/value.hpp:1313–1317

Check if this is a null value. Returns `true` if the value's @ref kind() is `kind::null`. @returns `this->kind() == kind::null`. @par Complexity Constant. @par Exception Safety No-throw guarantee. */

        No-throw guarantee.
    */
    bool
    is_null() const noexcept
    {
        return kind() == json::kind::null;
    }

    /** Checks if this is an @ref array or an @ref object.