1.0.0[−][src]Module std::convert
Traits for conversions between types.
The traits in this module provide a general way to talk about conversions
from one type to another. They follow the standard Rust conventions of
as/into/from.
Like many traits, these are often used as bounds for generic functions, to support arguments of multiple types.
- Implement the
As*traits for reference-to-reference conversions - Implement the
Intotrait when you want to consume the value in the conversion - The
Fromtrait is the most flexible, useful for value and reference conversions - The
TryFromandTryIntotraits behave likeFromandInto, but allow for the conversion to fail
As a library author, you should 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. However, there are some cases
where this is not possible, such as creating conversions into a type defined
outside your library, so implementing Into instead of From is
sometimes necessary.
Generic Implementations
AsRefandAsMutauto-dereference if the inner type is a referenceFrom<U> for TimpliesInto<T> for UTryFrom<U> for TimpliesTryInto<T> for UFromandIntoare reflexive, which means that all types canintothemselves andfromthemselves
See each trait for usage examples.
Enums
| Infallible | The error type for errors that can never happen. |
Traits
| AsMut | A cheap, mutable reference-to-mutable reference conversion. |
| AsRef | A cheap reference-to-reference conversion. Used to convert a value to a reference value within generic code. |
| From | Simple and safe type conversions in to |
| Into | A conversion that consumes |
| 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 | An identity function. |