Trait fn_block::IntoSome[−][src]

pub trait IntoSome: Sized {
    fn into_some(self) -> Option<Self>;
}

This trait, which is implemented for all sized types, provides the method into_some, which moves the value on which it is called into an Optional::Some. This is particularly useful when having to wrap a value into a Some at the end of a call chain.

Example:

let o : Option<String> = "foo bar ".trim().to_uppercase().into_some();
assert_eq!("FOO BAR", o.unwrap());

This can e.g. be used inside of an expression wrapped in a fn_expr! or fn_block! macro.

Example using fn_expr!:

let o = Some("Foobar");
let s = fn_expr!{ o?.get(0..3)?.to_lowercase().into_some() };
assert_eq!("foo", s.unwrap());

Required Methods

Implementors