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###### field::field (2 of 31 overloads)

Constructs a `field` holding NULL.

###### Synopsis

    explicit
    field(
        std::nullptr_t) noexcept;

###### Description

Caution: `field(NULL)` will NOT match this overload. It will try to construct a `string_view` from a NULL C string, causing undefined behavior.

###### Exception safety

No-throw guarantee.