Struct gc::GcCellRef [−][src]
A wrapper type for an immutably borrowed value from a GcCell<T>
.
Implementations
impl<'a, T: ?Sized> GcCellRef<'a, T>
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pub fn clone(orig: &GcCellRef<'a, T>) -> GcCellRef<'a, T>
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Copies a GcCellRef
.
The GcCell
is already immutably borrowed, so this cannot fail.
This is an associated function that needs to be used as
GcCellRef::clone(...)
. A Clone
implementation or a method
would interfere with the use of c.borrow().clone()
to clone
the contents of a GcCell
.
pub fn map<U, F>(orig: Self, f: F) -> GcCellRef<'a, U> where
U: ?Sized,
F: FnOnce(&T) -> &U,
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U: ?Sized,
F: FnOnce(&T) -> &U,
Makes a new GcCellRef
from a component of the borrowed data.
The GcCell
is already immutably borrowed, so this cannot fail.
This is an associated function that needs to be used as GcCellRef::map(...)
.
A method would interfere with methods of the same name on the contents
of a GcCellRef
used through Deref
.
Examples
use gc::{GcCell, GcCellRef}; let c = GcCell::new((5, 'b')); let b1: GcCellRef<(u32, char)> = c.borrow(); let b2: GcCellRef<u32> = GcCellRef::map(b1, |t| &t.0); //assert_eq!(b2, 5);
pub fn map_split<U, V, F>(
orig: Self,
f: F
) -> (GcCellRef<'a, U>, GcCellRef<'a, V>) where
U: ?Sized,
V: ?Sized,
F: FnOnce(&T) -> (&U, &V),
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orig: Self,
f: F
) -> (GcCellRef<'a, U>, GcCellRef<'a, V>) where
U: ?Sized,
V: ?Sized,
F: FnOnce(&T) -> (&U, &V),
Splits a GcCellRef
into multiple GcCellRef
s for different components of the borrowed data.
The GcCell
is already immutably borrowed, so this cannot fail.
This is an associated function that needs to be used as GcCellRef::map_split(...).
A method would interfere with methods of the same name on the contents of a GcCellRef
used through Deref
.
Examples
use gc::{GcCell, GcCellRef}; let cell = GcCell::new((1, 'c')); let borrow = cell.borrow(); let (first, second) = GcCellRef::map_split(borrow, |x| (&x.0, &x.1)); assert_eq!(*first, 1); assert_eq!(*second, 'c');
Trait Implementations
impl<'a, T: ?Sized + Debug> Debug for GcCellRef<'a, T>
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impl<'a, T: ?Sized> Deref for GcCellRef<'a, T>
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impl<'a, T: ?Sized + Display> Display for GcCellRef<'a, T>
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impl<'a, T: ?Sized> Drop for GcCellRef<'a, T>
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Auto Trait Implementations
impl<'a, T> !RefUnwindSafe for GcCellRef<'a, T>
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impl<'a, T> !Send for GcCellRef<'a, T>
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impl<'a, T> !Sync for GcCellRef<'a, T>
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impl<'a, T: ?Sized> Unpin for GcCellRef<'a, T>
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impl<'a, T> !UnwindSafe for GcCellRef<'a, T>
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Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,