Trait Guard 

pub trait Guard<'a, T>: Deref<Target = T>
where
    T: ?Sized,
{
    type Mapped<U: 'a + ?Sized>;

    // Required method
    fn guard_map<U, F>(self, f: F) -> Self::Mapped<U>
       where F: FnOnce(&T) -> &U,
             U: 'a + ?Sized;
}

Required Associated Types

type Mapped<U: 'a + ?Sized>

Required Methods

fn guard_map<U, F>(self, f: F) -> Self::Mapped<U>

where F: FnOnce(&T) -> &U, U: 'a + ?Sized,

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<'a, T> Guard<'a, T> for &'a T

type Mapped<U: 'a + ?Sized> = &'a U

fn guard_map<U, F>(self, f: F) -> <&'a T as Guard<'a, T>>::Mapped<U>

where F: FnOnce(&'a T) -> &'a U, U: 'a + ?Sized,

impl<'a, T> Guard<'a, T> for &'a mut T

type Mapped<U: 'a + ?Sized> = &'a U

fn guard_map<U, F>(self, f: F) -> <&'a mut T as Guard<'a, T>>::Mapped<U>

where F: FnOnce(&'a T) -> &'a U, U: 'a + ?Sized,

impl<'a, T> Guard<'a, T> for Ref<'a, T>

where T: ?Sized,

Available on crate feature std only.

type Mapped<U: 'a + ?Sized> = Ref<'a, U>

fn guard_map<U, F>(self, f: F) -> <Ref<'a, T> as Guard<'a, T>>::Mapped<U>

where F: FnOnce(&T) -> &U, U: 'a + ?Sized,

impl<'a, T> Guard<'a, T> for MappedRwLockReadGuard<'a, T>

Available on crate feature std only.

type Mapped<U: 'a + ?Sized> = MappedRwLockReadGuard<'a, U>

fn guard_map<U, F>( self, f: F, ) -> <MappedRwLockReadGuard<'a, T> as Guard<'a, T>>::Mapped<U>

where F: FnOnce(&T) -> &U, U: 'a + ?Sized,

impl<'a, T> Guard<'a, T> for RwLockReadGuard<'a, T>

where T: ?Sized,

Available on crate feature std only.

type Mapped<U: 'a + ?Sized> = MappedRwLockReadGuard<'a, U>

fn guard_map<U, F>( self, f: F, ) -> <RwLockReadGuard<'a, T> as Guard<'a, T>>::Mapped<U>

where F: FnOnce(&T) -> &U, U: 'a + ?Sized,

impl<'a, T> Guard<'a, T> for RwLockWriteGuard<'a, T>

where T: ?Sized,

Available on crate feature std only.

type Mapped<U: 'a + ?Sized> = MappedRwLockReadGuard<'a, U>

fn guard_map<U, F>( self, f: F, ) -> <RwLockWriteGuard<'a, T> as Guard<'a, T>>::Mapped<U>

where F: FnOnce(&T) -> &U, U: 'a + ?Sized,

Implementors

impl<'a, D, T> Guard<'a, T> for SingletonGuard<D>

where D: Guard<'a, T>,

type Mapped<U: 'a + ?Sized> = SingletonGuard<<D as Guard<'a, T>>::Mapped<U>>