Struct IsAWriteMarker

pub struct IsAWriteMarker<K, T: ?Sized, R: ?Sized>(/* private fields */);

Hack used to automatically convert a mutable reference to a StrWriter to a StrWriterMut, and do nothing with other types.

The conversion is done with the coerce methods.

Type parameters

K is <R as WriteMarker>::Kind The kind of type that T is, either a IsAStrWriter or IsNotAStrWriter

T is <R as WriteMarker>::This: The R type after removing all layers of references.

R: A type that implements WriteMarker.

Coerce Method

The coerce method is what does the conversion from a &mut T depending on the K type parameter:

• IsAStrWriter: the reference is converted into a StrWriterMut<'_>.

• IsNotAStrWriter: the reference is simply returned unchanged.

Implementations

impl<R> IsAWriteMarker<R::Kind, R::This, R>

where R: ?Sized + WriteMarker,

pub const NEW: Self

Constructs a IsAWriteMarker

impl<K, T: ?Sized, R: ?Sized> IsAWriteMarker<K, T, R>

pub const fn infer_type(self, _: &R) -> Self

Infers the type parmaeters of this IsAWriteMarker with the passed reference.

impl<T: ?Sized, R: ?Sized> IsAWriteMarker<IsAStrWriter, StrWriter<T>, R>

pub const fn coerce(self, mutref: &mut StrWriter) -> StrWriterMut<'_>

Converts the &mut StrWriter to a StrWriterMut<'_>.

impl<T: ?Sized, R: ?Sized> IsAWriteMarker<IsNotAStrWriter, T, R>

pub const fn coerce(self, mutref: &mut T) -> &mut T

An idntity function, just takesmutref and returns it.

Trait Implementations

impl<K, T: ?Sized, R: ?Sized> Clone for IsAWriteMarker<K, T, R>

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<K, T: ?Sized, R: ?Sized> Copy for IsAWriteMarker<K, T, R>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 0 bytes