Trait conv::TryFrom [−] [src]

pub trait TryFrom<Src>: Sized {
    type Err: Error;
    fn try_from(src: Src) -> Result<Self, Self::Err>;
}

This trait is used to perform a conversion between different semantic types which might fail.

Where possible, prefer implementing this trait over TryInto, but prefer using TryInto for generic constraints.

Details

Typically, this should be used in cases where you are converting between values whose ranges and/or representations only partially overlap. That the conversion may fail should be a reasonably expected outcome. A standard example of this is converting from integers to enums of unitary variants.

Associated Types

`type Err: Error`

The error type produced by a failed conversion.

Required Methods

`fn try_from(src: Src) -> Result<Self, Self::Err>`

Convert the given value into the subject type.

Implementors

impl TryFrom<char> for u32 type Err = NoError;
impl TryFrom<char> for usize type Err = NoError;
impl TryFrom<char> for isize type Err = NoError;
impl TryFrom<char> for i8 type Err = PosOverflow<char>;
impl TryFrom<char> for i16 type Err = PosOverflow<char>;
impl TryFrom<char> for i32 type Err = PosOverflow<char>;
impl TryFrom<char> for u8 type Err = PosOverflow<char>;
impl TryFrom<char> for u16 type Err = PosOverflow<char>;
impl TryFrom<char> for i64 type Err = NoError;
impl TryFrom<char> for u64 type Err = NoError;
impl TryFrom<u8> for char type Err = NoError;
impl TryFrom<u16> for char type Err = Unrepresentable<u16>;
impl TryFrom<u32> for char type Err = Unrepresentable<u32>;
impl TryFrom<i8> for char type Err = Unrepresentable<i8>;
impl TryFrom<i16> for char type Err = Unrepresentable<i16>;
impl TryFrom<i32> for char type Err = Unrepresentable<i32>;
impl TryFrom<i64> for char type Err = Unrepresentable<i64>;
impl TryFrom<isize> for char type Err = Unrepresentable<isize>;
impl TryFrom<u64> for char type Err = Unrepresentable<u64>;
impl TryFrom<usize> for char type Err = Unrepresentable<usize>;
impl<Src> TryFrom<Src> for Src type Err = NoError;