pub trait TryFrom<T>: Sized {
type Error;
// Required method
fn try_from(value: T) -> Result<Self, Self::Error>;
}Expand description
Simple and safe type conversions that may fail in a controlled
way under some circumstances. It is the reciprocal of TryInto.
This is useful when you are doing a type conversion that may
trivially succeed but may also need special handling.
For example, there is no way to convert an i64 into an i32
using the From trait, because an i64 may contain a value
that an i32 cannot represent and so the conversion would lose data.
This might be handled by truncating the i64 to an i32 or by
simply returning i32::MAX, or by some other method. The From
trait is intended for perfect conversions, so the TryFrom trait
informs the programmer when a type conversion could go bad and lets
them decide how to handle it.
§Generic Implementations
TryFrom<T> for UimpliesTryInto<U> for Ttry_fromis reflexive, which means thatTryFrom<T> for Tis implemented and cannot fail – the associatedErrortype for callingT::try_from()on a value of typeTisInfallible. When the!type is stabilizedInfallibleand!will be equivalent.
TryFrom<T> can be implemented as follows:
struct GreaterThanZero(i32);
impl TryFrom<i32> for GreaterThanZero {
type Error = &'static str;
fn try_from(value: i32) -> Result<Self, Self::Error> {
if value <= 0 {
Err("GreaterThanZero only accepts values greater than zero!")
} else {
Ok(GreaterThanZero(value))
}
}
}§Examples
As described, i32 implements TryFrom<i64>:
let big_number = 1_000_000_000_000i64;
// Silently truncates `big_number`, requires detecting
// and handling the truncation after the fact.
let smaller_number = big_number as i32;
assert_eq!(smaller_number, -727379968);
// Returns an error because `big_number` is too big to
// fit in an `i32`.
let try_smaller_number = i32::try_from(big_number);
assert!(try_smaller_number.is_err());
// Returns `Ok(3)`.
let try_successful_smaller_number = i32::try_from(3);
assert!(try_successful_smaller_number.is_ok());Required Associated Types§
Required Methods§
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.
Implementors§
Source§impl TryFrom<Error> for InvalidFormatDescription
impl TryFrom<Error> for InvalidFormatDescription
type Error = DifferentVariant
Source§impl TryFrom<Error> for ParseFromDescription
impl TryFrom<Error> for ParseFromDescription
type Error = DifferentVariant
Source§impl TryFrom<Error> for TryFromParsed
impl TryFrom<Error> for TryFromParsed
type Error = DifferentVariant
Source§impl TryFrom<Error> for ComponentRange
impl TryFrom<Error> for ComponentRange
type Error = DifferentVariant
Source§impl TryFrom<Error> for ConversionRange
impl TryFrom<Error> for ConversionRange
type Error = DifferentVariant
Source§impl TryFrom<Error> for DifferentVariant
impl TryFrom<Error> for DifferentVariant
type Error = DifferentVariant
Source§impl TryFrom<Error> for IndeterminateOffset
impl TryFrom<Error> for IndeterminateOffset
type Error = DifferentVariant
Source§impl TryFrom<Error> for InvalidVariant
impl TryFrom<Error> for InvalidVariant
type Error = DifferentVariant
Source§impl TryFrom<Parse> for ParseFromDescription
impl TryFrom<Parse> for ParseFromDescription
type Error = DifferentVariant
Source§impl TryFrom<Parse> for TryFromParsed
impl TryFrom<Parse> for TryFromParsed
type Error = DifferentVariant
Source§impl TryFrom<TryFromParsed> for ComponentRange
impl TryFrom<TryFromParsed> for ComponentRange
type Error = DifferentVariant
Source§impl TryFrom<BorrowedFormatItem<'_>> for Component
impl TryFrom<BorrowedFormatItem<'_>> for Component
type Error = DifferentVariant
Source§impl TryFrom<OwnedFormatItem> for Component
impl TryFrom<OwnedFormatItem> for Component
type Error = DifferentVariant
Source§impl TryFrom<OwnedFormatItem> for Vec<OwnedFormatItem>
impl TryFrom<OwnedFormatItem> for Vec<OwnedFormatItem>
type Error = DifferentVariant
1.59.0 · Source§impl TryFrom<char> for u8
Maps a char with code point in U+0000..=U+00FF to a byte in 0x00..=0xFF with same value,
failing if the code point is greater than U+00FF.
impl TryFrom<char> for u8
Maps a char with code point in U+0000..=U+00FF to a byte in 0x00..=0xFF with same value,
failing if the code point is greater than U+00FF.
See impl From<u8> for char for details on the encoding.
type Error = TryFromCharError
1.74.0 · Source§impl TryFrom<char> for u16
Maps a char with code point in U+0000..=U+FFFF to a u16 in 0x0000..=0xFFFF with same value,
failing if the code point is greater than U+FFFF.
impl TryFrom<char> for u16
Maps a char with code point in U+0000..=U+FFFF to a u16 in 0x0000..=0xFFFF with same value,
failing if the code point is greater than U+FFFF.
This corresponds to the UCS-2 encoding, as specified in ISO/IEC 10646:2003.
type Error = TryFromCharError
Source§impl TryFrom<ByteString> for String
impl TryFrom<ByteString> for String
type Error = FromUtf8Error
Source§impl TryFrom<PathBuf> for Utf8PathBuf
impl TryFrom<PathBuf> for Utf8PathBuf
type Error = FromPathBufError
Source§impl TryFrom<DataResponse<AnyMarker>> for AnyResponse
impl TryFrom<DataResponse<AnyMarker>> for AnyResponse
Source§impl TryFrom<Parsed> for OffsetDateTime
impl TryFrom<Parsed> for OffsetDateTime
type Error = TryFromParsed
Source§impl TryFrom<Parsed> for PrimitiveDateTime
impl TryFrom<Parsed> for PrimitiveDateTime
type Error = TryFromParsed
Source§impl TryFrom<UnvalidatedChar> for char
impl TryFrom<UnvalidatedChar> for char
type Error = CharTryFromError
Source§impl<'a> TryFrom<&'a Path> for &'a Utf8Path
impl<'a> TryFrom<&'a Path> for &'a Utf8Path
Returns FromPathError if the path is not valid UTF-8.
§Examples
use camino::Utf8Path;
use std::convert::TryFrom;
use std::ffi::OsStr;
use std::os::unix::ffi::OsStrExt;
use std::path::Path;
let unicode_path = Path::new("/valid/unicode");
<&Utf8Path>::try_from(unicode_path).expect("valid Unicode path succeeded");
// Paths on Unix can be non-UTF-8.
let non_unicode_str = OsStr::from_bytes(b"\xFF\xFF\xFF");
let non_unicode_path = Path::new(non_unicode_str);
assert!(<&Utf8Path>::try_from(non_unicode_path).is_err(), "non-Unicode path failed");type Error = FromPathError
Source§impl<'a> TryFrom<BorrowedFormatItem<'a>> for &[BorrowedFormatItem<'a>]
impl<'a> TryFrom<BorrowedFormatItem<'a>> for &[BorrowedFormatItem<'a>]
type Error = DifferentVariant
1.34.0 · Source§impl<'a, T, const N: usize> TryFrom<&'a [T]> for &'a [T; N]
Tries to create an array ref &[T; N] from a slice ref &[T]. Succeeds if
slice.len() == N.
impl<'a, T, const N: usize> TryFrom<&'a [T]> for &'a [T; N]
Tries to create an array ref &[T; N] from a slice ref &[T]. Succeeds if
slice.len() == N.
let bytes: [u8; 3] = [1, 0, 2];
let bytes_head: &[u8; 2] = <&[u8; 2]>::try_from(&bytes[0..2]).unwrap();
assert_eq!(1, u16::from_le_bytes(*bytes_head));
let bytes_tail: &[u8; 2] = bytes[1..3].try_into().unwrap();
assert_eq!(512, u16::from_le_bytes(*bytes_tail));type Error = TryFromSliceError
1.34.0 · Source§impl<'a, T, const N: usize> TryFrom<&'a mut [T]> for &'a mut [T; N]
Tries to create a mutable array ref &mut [T; N] from a mutable slice ref
&mut [T]. Succeeds if slice.len() == N.
impl<'a, T, const N: usize> TryFrom<&'a mut [T]> for &'a mut [T; N]
Tries to create a mutable array ref &mut [T; N] from a mutable slice ref
&mut [T]. Succeeds if slice.len() == N.
let mut bytes: [u8; 3] = [1, 0, 2];
let bytes_head: &mut [u8; 2] = <&mut [u8; 2]>::try_from(&mut bytes[0..2]).unwrap();
assert_eq!(1, u16::from_le_bytes(*bytes_head));
let bytes_tail: &mut [u8; 2] = (&mut bytes[1..3]).try_into().unwrap();
assert_eq!(512, u16::from_le_bytes(*bytes_tail));type Error = TryFromSliceError
Source§impl<'data> TryFrom<&RangeFull> for CodePointInversionList<'data>
impl<'data> TryFrom<&RangeFull> for CodePointInversionList<'data>
Source§impl<'data> TryFrom<&RangeInclusive<char>> for CodePointInversionList<'data>
impl<'data> TryFrom<&RangeInclusive<char>> for CodePointInversionList<'data>
Source§impl<'data> TryFrom<&RangeToInclusive<char>> for CodePointInversionList<'data>
impl<'data> TryFrom<&RangeToInclusive<char>> for CodePointInversionList<'data>
Source§impl<M> TryFrom<DataResponse<M>> for DataPayload<M>where
M: DataMarker,
impl<M> TryFrom<DataResponse<M>> for DataPayload<M>where
M: DataMarker,
1.43.0 · Source§impl<T, A, const N: usize> TryFrom<Arc<[T], A>> for Arc<[T; N], A>where
A: Allocator,
impl<T, A, const N: usize> TryFrom<Arc<[T], A>> for Arc<[T; N], A>where
A: Allocator,
1.34.0 · Source§impl<T, const N: usize> TryFrom<&[T]> for [T; N]where
T: Copy,
Tries to create an array [T; N] by copying from a slice &[T].
Succeeds if slice.len() == N.
impl<T, const N: usize> TryFrom<&[T]> for [T; N]where
T: Copy,
Tries to create an array [T; N] by copying from a slice &[T].
Succeeds if slice.len() == N.
let bytes: [u8; 3] = [1, 0, 2];
let bytes_head: [u8; 2] = <[u8; 2]>::try_from(&bytes[0..2]).unwrap();
assert_eq!(1, u16::from_le_bytes(bytes_head));
let bytes_tail: [u8; 2] = bytes[1..3].try_into().unwrap();
assert_eq!(512, u16::from_le_bytes(bytes_tail));type Error = TryFromSliceError
1.59.0 · Source§impl<T, const N: usize> TryFrom<&mut [T]> for [T; N]where
T: Copy,
Tries to create an array [T; N] by copying from a mutable slice &mut [T].
Succeeds if slice.len() == N.
impl<T, const N: usize> TryFrom<&mut [T]> for [T; N]where
T: Copy,
Tries to create an array [T; N] by copying from a mutable slice &mut [T].
Succeeds if slice.len() == N.
let mut bytes: [u8; 3] = [1, 0, 2];
let bytes_head: [u8; 2] = <[u8; 2]>::try_from(&mut bytes[0..2]).unwrap();
assert_eq!(1, u16::from_le_bytes(bytes_head));
let bytes_tail: [u8; 2] = (&mut bytes[1..3]).try_into().unwrap();
assert_eq!(512, u16::from_le_bytes(bytes_tail));