Module core::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 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 in the standard library.

Generic Implementations

• 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.

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 Self. It is the reciprocal of Into.
Into	A conversion that consumes self, which may or may not be expensive. The reciprocal of From.
TryFrom	[ Experimental ] Attempt to construct Self via a conversion.
TryInto	[ Experimental ] An attempted conversion that consumes self, which may or may not be expensive.