Module fera::optional

Generic optional value.

Structs

MaxNone

Creates T::max_value() as None.

MinNone

Creates T::min_value() as None.

OptionalBool

An Optional for bool with 1 byte size. std::option::Option<bool> have size 1 since rustc 1.23.

Optioned

An Optional that represents None with a specified value (B::none()) of T domain.

Traits

BuildNone

A builder for None values for type T.

Optional

A trait that represents an optional value.

Type Definitions

OptionalMax

An Optional that uses T::max_value() as None.

OptionalMin

An Optional that uses T::min_value() as None.