Struct Lowered 

pub struct Lowered<'a, T: 'a> { /* private fields */ }

A value of T with its lifetime shortened to 'a. This is isomorphic to <T as Lower<'a>>::Target, but provides additional information to the compiler to assist type inferencing.

Implementations

impl<'a, T: 'a> Lowered<'a, T>

pub fn new<'b, O>(value: O) -> Self

where O: Lower<'b, Target = T> + 'a, 'b: 'a,

Constructs a Lowered from its wrapped value.

The type signature of this function may look a bit odd, but it was carefully crafted to assist type inferencing and minimize spurious compiler errors. You can think of this function as taking a <T as Lower<'a>>::Target.

pub fn new_direct(value: <T as Lower<'a>>::Target) -> Self

where T: Lower<'a>, <T as Lower<'a>>::Target: Sized,

Constructs a Lowered from its wrapped value.

pub fn unwrap(lowered: Self) -> <T as Lower<'a>>::Target

where T: Lower<'a>, <T as Lower<'a>>::Target: Sized,

Unpacks this Lowered wrapper.

Trait Implementations

impl<'a, T: Lower<'a>> Deref for Lowered<'a, T>

type Target = <T as Lower<'a>>::Target

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'a, T: Lower<'a>> DerefMut for Lowered<'a, T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<'a, 'b, T: 'a + 'b> Lower<'b> for Lowered<'a, T>

type Target = Lowered<'b, T>

The type resulting from substituting the covariant lifetime parameters in Self for 'a.

fn lower_ref<'c>(&'c self) -> &'c Self::Target

where 'a: 'b, 'b: 'c,

Applies convariance in order to shorten the internal lifetime parameters in a reference.