is_null helper that uses nullable_traits<T> if available.
Declared in <mrdocs/ADT/Nullable.hpp>
template<has_nullable_traits_v T>
bool
is_null(T const& v) noexcept(noexcept(nullable_traits<T>::is_null(v)));true if v is null, false otherwise.
| Name | Description |
|---|---|
| v | The value to test for null. |