Struct const_format::marker_traits::IsAWriteMarker

pub struct IsAWriteMarker<K, T: ?Sized, R: ?Sized>(_);

Available on crate feature fmt only.

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>