1.0.0[−][src]Module core::convert
Traits for conversions between types.
The traits in this module provide a way to convert from one type to another type. Each trait serves a different purpose:
- Implement the
AsRef
trait for cheap reference-to-reference conversions - Implement the
AsMut
trait for cheap mutable-to-mutable conversions - Implement the
From
trait for consuming value-to-value conversions - Implement the
Into
trait for consuming value-to-value conversions to types outside the current crate - The
TryFrom
andTryInto
traits behave likeFrom
andInto
, but should be implemented when the conversion can fail.
The traits in this module are often used as trait bounds for generic functions such that to arguments of multiple types are supported. See the documentation of each trait for examples.
As a library author, you should always prefer implementing From<T>
or
TryFrom<T>
rather than Into<U>
or TryInto<U>
,
as From
and TryFrom
provide greater flexibility and offer
equivalent Into
or TryInto
implementations for free, thanks to a
blanket implementation in the standard library. Only implement Into
or TryInto
when a conversion to a type outside the current crate is required.
Generic Implementations
AsRef
andAsMut
auto-dereference if the inner type is a referenceFrom
<U> for T
impliesInto
<T> for U
TryFrom
<U> for T
impliesTryInto
<T> for U
From
andInto
are reflexive, which means that all types caninto
themselves andfrom
themselves
See each trait for usage examples.
Enums
Infallible | The error type for errors that can never happen. |
Traits
AsMut | Used to do a cheap mutable-to-mutable reference conversion. |
AsRef | Used to do a cheap reference-to-reference conversion. |
From | Used to do value-to-value conversions while consuming the input value. It is the reciprocal of
|
Into | A value-to-value conversion that consumes the input value. The
opposite of |
TryFrom | Simple and safe type conversions that may fail in a controlled
way under some circumstances. It is the reciprocal of |
TryInto | An attempted conversion that consumes |
Functions
identity | The identity function. |