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55f9712d
编写于
1月 30, 2017
作者:
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Auto merge of #39407 - GuillaumeGomez:convert_module, r=frewsxcv
Add missing url in convert module r? @frewsxcv
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19c9f18b
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18 addition
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10 deletion
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-10
src/libcore/convert.rs
src/libcore/convert.rs
+18
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src/libcore/convert.rs
浏览文件 @
55f9712d
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@@ -18,25 +18,33 @@
//! support arguments of multiple types.
//!
//! - Impl the `As*` traits for reference-to-reference conversions
//! - Impl the
`Into`
trait when you want to consume the value in the conversion
//! - The
`From`
trait is the most flexible, useful for value _and_ reference conversions
//! - The
`TryFrom` and `TryInto` traits behave like `From` and `Into`
, but allow for the
//! - Impl the
[`Into`]
trait when you want to consume the value in the conversion
//! - The
[`From`]
trait is the most flexible, useful for value _and_ reference conversions
//! - The
[`TryFrom`] and [`TryInto`] traits behave like [`From`] and [`Into`]
, 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
//! As a library author, you should prefer implementing [`From<T>`][`From`] or
//! [`TryFrom<T>`][`TryFrom`] rather than [`Into<U>`][`Into`] or [`TryInto<U>`][`TryInto`],
//! 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.
//!
//! # Generic impl
//!
//! -
`AsRef` and `AsMut`
auto-dereference if the inner type is a reference
//! -
`From<U> for T` implies `Into
<T> for U`
//! -
`TryFrom<U> for T` implies `TryInto
<T> for U`
//! -
`From` and `Into`
are reflexive, which means that all types can `into()`
//! -
[`AsRef`] and [`AsMut`]
auto-dereference if the inner type is a reference
//! -
[`From`]`<U> for T` implies [`Into`]`
<T> for U`
//! -
[`TryFrom`]`<U> for T` implies [`TryInto`]`
<T> for U`
//! -
[`From`] and [`Into`]
are reflexive, which means that all types can `into()`
//! themselves and `from()` themselves
//!
//! See each trait for usage examples.
//!
//! [`Into`]: trait.Into.html
//! [`From`]: trait.From.html
//! [`TryFrom`]: trait.TryFrom.html
//! [`TryInto`]: trait.TryInto.html
//! [`AsRef`]: trait.AsRef.html
//! [`AsMut`]: trait.AsMut.html
#![stable(feature
=
"rust1"
,
since
=
"1.0.0"
)]
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