std::experimental::nullopt_t

Header: <experimental/optional>

std::experimental::nullopt_t is an empty class type used to indicate optional type with uninitialized state. In particular, std::experimental::optional has a constructor with nullopt_t as a single argument, which creates an optional that does not contain a value.

# Declarations

struct nullopt_t;

(library fundamentals TS)

# Notes

nullopt_t is not DefaultConstructible to support both op = {}; and op = nullopt; as the syntax for disengaging an optional object.

A possible implementation of this class is

# See also

• nullopt