Trait kvarn::prelude::compact_str::core::convert::TryFrom

pub trait TryFrom<T>: Sized {
    type Error;

    // Required method
    fn try_from(value: T) -> Result<Self, Self::Error>;
}

Available on non-crate feature miri-test-libstd only.

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 (essentially giving the i64’s value modulo i32::MAX) 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 U implies TryInto<U> for T
• try_from is reflexive, which means that TryFrom<T> for T is implemented and cannot fail – the associated Error type for calling T::try_from() on a value of type T is Infallible. When the ! type is stabilized Infallible and ! 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

type Error

The type returned in the event of a conversion error.

Required Methods

fn try_from(value: T) -> Result<Self, Self::Error>

Performs the conversion.

Implementors

impl TryFrom<&str> for Uuid

type Error = Error

impl TryFrom<&str> for Alphabet

type Error = ParseAlphabetError

impl TryFrom<&str> for ServerName

Attempt to make a ServerName from a string by parsing it as a DNS name.

type Error = InvalidDnsNameError

impl TryFrom<&String> for PathAndQuery

type Error = InvalidUri

impl TryFrom<&BigInt> for i8

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for i16

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for i32

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for i64

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for i128

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for isize

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for u8

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for u16

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for u32

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for u64

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for u128

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for usize

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigInt> for BigUint

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for i8

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for i16

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for i32

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for i64

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for i128

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for isize

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for u8

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for u16

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for u32

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for u64

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for u128

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<&BigUint> for usize

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<char> for u8

Map char with code point in U+0000..=U+00FF to 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

impl TryFrom<i8> for u8

type Error = TryFromIntError

impl TryFrom<i8> for u16

type Error = TryFromIntError

impl TryFrom<i8> for u32

type Error = TryFromIntError

impl TryFrom<i8> for u64

type Error = TryFromIntError

impl TryFrom<i8> for u128

type Error = TryFromIntError

impl TryFrom<i8> for usize

type Error = TryFromIntError

impl TryFrom<i8> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<i8> for BigUint

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<i16> for i8

type Error = TryFromIntError

impl TryFrom<i16> for u8

type Error = TryFromIntError

impl TryFrom<i16> for u16

type Error = TryFromIntError

impl TryFrom<i16> for u32

type Error = TryFromIntError

impl TryFrom<i16> for u64

type Error = TryFromIntError

impl TryFrom<i16> for u128

type Error = TryFromIntError

impl TryFrom<i16> for usize

type Error = TryFromIntError

impl TryFrom<i16> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<i16> for BigUint

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<i32> for i8

type Error = TryFromIntError

impl TryFrom<i32> for i16

type Error = TryFromIntError

impl TryFrom<i32> for isize

type Error = TryFromIntError

impl TryFrom<i32> for u8

type Error = TryFromIntError

impl TryFrom<i32> for u16

type Error = TryFromIntError

impl TryFrom<i32> for u32

type Error = TryFromIntError

impl TryFrom<i32> for u64

type Error = TryFromIntError

impl TryFrom<i32> for u128

type Error = TryFromIntError

impl TryFrom<i32> for usize

type Error = TryFromIntError

impl TryFrom<i32> for NonZeroI32

type Error = TryFromIntError

impl TryFrom<i32> for BigUint

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<i64> for i8

type Error = TryFromIntError

impl TryFrom<i64> for i16

type Error = TryFromIntError

impl TryFrom<i64> for i32

type Error = TryFromIntError

impl TryFrom<i64> for isize

type Error = TryFromIntError

impl TryFrom<i64> for u8

type Error = TryFromIntError

impl TryFrom<i64> for u16

type Error = TryFromIntError

impl TryFrom<i64> for u32

type Error = TryFromIntError

impl TryFrom<i64> for u64

type Error = TryFromIntError

impl TryFrom<i64> for u128

type Error = TryFromIntError

impl TryFrom<i64> for usize

type Error = TryFromIntError

impl TryFrom<i64> for NonZeroI64

type Error = TryFromIntError

impl TryFrom<i64> for BigUint

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<i128> for i8

type Error = TryFromIntError

impl TryFrom<i128> for i16

type Error = TryFromIntError

impl TryFrom<i128> for i32

type Error = TryFromIntError

impl TryFrom<i128> for i64

type Error = TryFromIntError

impl TryFrom<i128> for isize

type Error = TryFromIntError

impl TryFrom<i128> for u8

type Error = TryFromIntError

impl TryFrom<i128> for u16

type Error = TryFromIntError

impl TryFrom<i128> for u32

type Error = TryFromIntError

impl TryFrom<i128> for u64

type Error = TryFromIntError

impl TryFrom<i128> for u128

type Error = TryFromIntError

impl TryFrom<i128> for usize

type Error = TryFromIntError

impl TryFrom<i128> for NonZeroI128

type Error = TryFromIntError

impl TryFrom<i128> for BigUint

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<isize> for i8

type Error = TryFromIntError

impl TryFrom<isize> for i16

type Error = TryFromIntError

impl TryFrom<isize> for i32

type Error = TryFromIntError

impl TryFrom<isize> for i64

type Error = TryFromIntError

impl TryFrom<isize> for i128

type Error = TryFromIntError

impl TryFrom<isize> for u8

type Error = TryFromIntError

impl TryFrom<isize> for u16

type Error = TryFromIntError

impl TryFrom<isize> for u32

type Error = TryFromIntError

impl TryFrom<isize> for u64

type Error = TryFromIntError

impl TryFrom<isize> for u128

type Error = TryFromIntError

impl TryFrom<isize> for usize

type Error = TryFromIntError

impl TryFrom<isize> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<isize> for BigUint

Available on has_try_from only.

type Error = TryFromBigIntError<()>

impl TryFrom<u8> for i8

type Error = TryFromIntError

impl TryFrom<u8> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<u8> for Class

type Error = BerClassFromIntError

impl TryFrom<u8> for Month

type Error = ComponentRange

impl TryFrom<u16> for i8

type Error = TryFromIntError

impl TryFrom<u16> for i16

type Error = TryFromIntError

impl TryFrom<u16> for isize

type Error = TryFromIntError

impl TryFrom<u16> for u8

type Error = TryFromIntError

impl TryFrom<u16> for StatusCode

type Error = InvalidStatusCode

impl TryFrom<u16> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<u32> for char

type Error = CharTryFromError

impl TryFrom<u32> for i8

type Error = TryFromIntError

impl TryFrom<u32> for i16

type Error = TryFromIntError

impl TryFrom<u32> for i32

type Error = TryFromIntError

impl TryFrom<u32> for isize

type Error = TryFromIntError

impl TryFrom<u32> for u8

type Error = TryFromIntError

impl TryFrom<u32> for u16

type Error = TryFromIntError

impl TryFrom<u32> for usize

type Error = TryFromIntError

impl TryFrom<u32> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<u64> for i8

type Error = TryFromIntError

impl TryFrom<u64> for i16

type Error = TryFromIntError

impl TryFrom<u64> for i32

type Error = TryFromIntError

impl TryFrom<u64> for i64

type Error = TryFromIntError

impl TryFrom<u64> for isize

type Error = TryFromIntError

impl TryFrom<u64> for u8

type Error = TryFromIntError

impl TryFrom<u64> for u16

type Error = TryFromIntError

impl TryFrom<u64> for u32

type Error = TryFromIntError

impl TryFrom<u64> for usize

type Error = TryFromIntError

impl TryFrom<u64> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<u128> for i8

type Error = TryFromIntError

impl TryFrom<u128> for i16

type Error = TryFromIntError

impl TryFrom<u128> for i32

type Error = TryFromIntError

impl TryFrom<u128> for i64

type Error = TryFromIntError

impl TryFrom<u128> for i128

type Error = TryFromIntError

impl TryFrom<u128> for isize

type Error = TryFromIntError

impl TryFrom<u128> for u8

type Error = TryFromIntError

impl TryFrom<u128> for u16

type Error = TryFromIntError

impl TryFrom<u128> for u32

type Error = TryFromIntError

impl TryFrom<u128> for u64

type Error = TryFromIntError

impl TryFrom<u128> for usize

type Error = TryFromIntError

impl TryFrom<u128> for NonZeroU128

type Error = TryFromIntError

impl TryFrom<usize> for i8

type Error = TryFromIntError

impl TryFrom<usize> for i16

type Error = TryFromIntError

impl TryFrom<usize> for i32

type Error = TryFromIntError

impl TryFrom<usize> for i64

type Error = TryFromIntError

impl TryFrom<usize> for i128

type Error = TryFromIntError

impl TryFrom<usize> for isize

type Error = TryFromIntError

impl TryFrom<usize> for u8

type Error = TryFromIntError

impl TryFrom<usize> for u16

type Error = TryFromIntError

impl TryFrom<usize> for u32

type Error = TryFromIntError

impl TryFrom<usize> for u64

type Error = TryFromIntError

impl TryFrom<usize> for u128

type Error = TryFromIntError

impl TryFrom<usize> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<usize> for Alignment

type Error = TryFromIntError

impl TryFrom<TcpListener> for TcpListener

type Error = Error

impl TryFrom<TcpStream> for TcpStream

type Error = Error

impl TryFrom<UdpSocket> for UdpSocket

type Error = Error

impl TryFrom<Parts> for Uri

type Error = InvalidUriParts

impl TryFrom<NonZeroI8> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroI8> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroI8> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroI8> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<NonZeroI8> for NonZeroU128

type Error = TryFromIntError

impl TryFrom<NonZeroI8> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroI16> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroI16> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroI16> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroI16> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroI16> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<NonZeroI16> for NonZeroU128

type Error = TryFromIntError

impl TryFrom<NonZeroI16> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroU128

type Error = TryFromIntError

impl TryFrom<NonZeroI32> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroI32

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroU128

type Error = TryFromIntError

impl TryFrom<NonZeroI64> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroI32

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroI64

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroU128

type Error = TryFromIntError

impl TryFrom<NonZeroI128> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroI32

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroI64

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroI128

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroU128

type Error = TryFromIntError

impl TryFrom<NonZeroIsize> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroU8> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroU16> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroU16> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroU16> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<NonZeroU16> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroU32> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroU32> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroU32> for NonZeroI32

type Error = TryFromIntError

impl TryFrom<NonZeroU32> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<NonZeroU32> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroU32> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroU32> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroI32

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroI64

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroU64> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroI32

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroI64

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroI128

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<NonZeroU128> for NonZeroUsize

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroI8

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroI16

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroI32

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroI64

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroI128

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroIsize

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroU8

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroU16

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroU32

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroU64

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for NonZeroU128

type Error = TryFromIntError

impl TryFrom<NonZeroUsize> for Alignment

type Error = TryFromIntError

impl TryFrom<Duration> for Duration

type Error = ConversionRange

impl TryFrom<String> for HeaderName

type Error = InvalidHeaderName

impl TryFrom<String> for HeaderValue

type Error = InvalidHeaderValue

impl TryFrom<String> for Authority

type Error = InvalidUri

impl TryFrom<String> for PathAndQuery

type Error = InvalidUri

impl TryFrom<String> for Uri

type Error = InvalidUri

impl TryFrom<Vec<u8, Global>> for HeaderName

type Error = InvalidHeaderName

impl TryFrom<Vec<u8, Global>> for HeaderValue

type Error = InvalidHeaderValue

impl TryFrom<Vec<u8, Global>> for Authority

type Error = InvalidUri

impl TryFrom<UnixDatagram> for UnixDatagram

type Error = Error

impl TryFrom<UnixListener> for UnixListener

type Error = Error

impl TryFrom<UnixStream> for UnixStream

type Error = Error

impl TryFrom<SystemTime> for webpki::time::Time

Available on crate feature std only.

type Error = Unspecified

impl TryFrom<BigInt> for i8

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for i16

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for i32

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for i64

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for i128

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for isize

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for u8

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for u16

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for u32

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for u64

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for u128

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for usize

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigInt> for BigUint

Available on has_try_from only.

type Error = TryFromBigIntError<BigInt>

impl TryFrom<BigUint> for i8

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for i16

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for i32

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for i64

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for i128

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for isize

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for u8

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for u16

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for u32

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for u64

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for u128

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BigUint> for usize

Available on has_try_from only.

type Error = TryFromBigIntError<BigUint>

impl TryFrom<BorrowedFormatItem<'_>> for Component

type Error = DifferentVariant

impl TryFrom<Duration> for kvarn::prelude::compact_str::core::time::Duration

type Error = ConversionRange

impl TryFrom<Error> for ComponentRange

type Error = DifferentVariant

impl TryFrom<Error> for ConversionRange

type Error = DifferentVariant

impl TryFrom<Error> for DifferentVariant

type Error = DifferentVariant

impl TryFrom<Error> for Format

type Error = DifferentVariant

impl TryFrom<Error> for IndeterminateOffset

type Error = DifferentVariant

impl TryFrom<Error> for InvalidFormatDescription

type Error = DifferentVariant

impl TryFrom<Error> for InvalidVariant

type Error = DifferentVariant

impl TryFrom<Error> for Parse

type Error = DifferentVariant

impl TryFrom<Error> for ParseFromDescription

type Error = DifferentVariant

impl TryFrom<Error> for TryFromParsed

type Error = DifferentVariant

impl TryFrom<Format> for Error

type Error = DifferentVariant

impl TryFrom<Integer<'_>> for i8

type Error = Error

impl TryFrom<Integer<'_>> for i16

type Error = Error

impl TryFrom<Integer<'_>> for i32

type Error = Error

impl TryFrom<Integer<'_>> for i64

type Error = Error

impl TryFrom<Integer<'_>> for i128

type Error = Error

impl TryFrom<Integer<'_>> for u8

type Error = Error

impl TryFrom<Integer<'_>> for u16

type Error = Error

impl TryFrom<Integer<'_>> for u32

type Error = Error

impl TryFrom<Integer<'_>> for u64

type Error = Error

impl TryFrom<Integer<'_>> for u128

type Error = Error

impl TryFrom<Message> for String

type Error = Error

impl TryFrom<OwnedFormatItem> for Vec<OwnedFormatItem, Global>

type Error = DifferentVariant

impl TryFrom<OwnedFormatItem> for Component

type Error = DifferentVariant

impl TryFrom<Parse> for ParseFromDescription

type Error = DifferentVariant

impl TryFrom<Parse> for TryFromParsed

type Error = DifferentVariant

impl TryFrom<Parsed> for OffsetDateTime

type Error = <DateTime<Fixed> as TryFrom<Parsed>>::Error

impl TryFrom<Parsed> for Date

type Error = TryFromParsed

impl TryFrom<Parsed> for PrimitiveDateTime

type Error = <DateTime<None> as TryFrom<Parsed>>::Error

impl TryFrom<Parsed> for Time

type Error = TryFromParsed

impl TryFrom<Parsed> for UtcOffset

type Error = TryFromParsed

impl TryFrom<PlainMessage> for Message

Parses a plaintext message into a well-typed [Message].

A [PlainMessage] must contain plaintext content. Encrypted content should be stored in an [OpaqueMessage] and decrypted before being stored into a [PlainMessage].

type Error = Error

impl TryFrom<TryFromParsed> for ComponentRange

type Error = DifferentVariant

impl<'a> TryFrom<&'a str> for HeaderName

type Error = InvalidHeaderName

impl<'a> TryFrom<&'a str> for HeaderValue

type Error = InvalidHeaderValue

impl<'a> TryFrom<&'a str> for Method

type Error = InvalidMethod

impl<'a> TryFrom<&'a str> for StatusCode

type Error = InvalidStatusCode

impl<'a> TryFrom<&'a str> for Authority

type Error = InvalidUri

impl<'a> TryFrom<&'a str> for PathAndQuery

type Error = InvalidUri

impl<'a> TryFrom<&'a str> for Scheme

type Error = InvalidUri

impl<'a> TryFrom<&'a str> for Uri

type Error = InvalidUri

impl<'a> TryFrom<&'a Uri> for Uri

type Error = Error

impl<'a> TryFrom<&'a String> for HeaderName

type Error = InvalidHeaderName

impl<'a> TryFrom<&'a String> for HeaderValue

type Error = InvalidHeaderValue

impl<'a> TryFrom<&'a String> for Uri

type Error = InvalidUri

impl<'a> TryFrom<&'a [u8]> for HeaderName

type Error = InvalidHeaderName

impl<'a> TryFrom<&'a [u8]> for HeaderValue

type Error = InvalidHeaderValue

impl<'a> TryFrom<&'a [u8]> for Method

type Error = InvalidMethod

impl<'a> TryFrom<&'a [u8]> for StatusCode

type Error = InvalidStatusCode

impl<'a> TryFrom<&'a [u8]> for Authority

type Error = InvalidUri

impl<'a> TryFrom<&'a [u8]> for PathAndQuery

type Error = InvalidUri

impl<'a> TryFrom<&'a [u8]> for Scheme

type Error = InvalidUri

impl<'a> TryFrom<&'a [u8]> for Uri

type Error = InvalidUri

impl<'a> TryFrom<&'a [u8]> for EndEntityCert<'a>

type Error = Error

impl<'a> TryFrom<Vec<u8, Global>> for PathAndQuery

type Error = InvalidUri

impl<'a> TryFrom<Vec<u8, Global>> for Uri

type Error = InvalidUri

impl<'a> TryFrom<Any<'a>> for &'a str

type Error = Error

impl<'a> TryFrom<Any<'a>> for &'a [u8]

type Error = Error

impl<'a> TryFrom<Any<'a>> for bool

type Error = Error

impl<'a> TryFrom<Any<'a>> for f32

type Error = Error

impl<'a> TryFrom<Any<'a>> for f64

type Error = Error

impl<'a> TryFrom<Any<'a>> for i8

type Error = Error

impl<'a> TryFrom<Any<'a>> for i16

type Error = Error

impl<'a> TryFrom<Any<'a>> for i32

type Error = Error

impl<'a> TryFrom<Any<'a>> for i64

type Error = Error

impl<'a> TryFrom<Any<'a>> for i128

type Error = Error

impl<'a> TryFrom<Any<'a>> for u8

type Error = Error

impl<'a> TryFrom<Any<'a>> for u16

type Error = Error

impl<'a> TryFrom<Any<'a>> for u32

type Error = Error

impl<'a> TryFrom<Any<'a>> for u64

type Error = Error

impl<'a> TryFrom<Any<'a>> for u128

type Error = Error

impl<'a> TryFrom<Any<'a>> for ()

type Error = Error

impl<'a> TryFrom<Any<'a>> for String

type Error = Error

impl<'a> TryFrom<Any<'a>> for BitString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for BmpString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for Boolean

type Error = Error

impl<'a> TryFrom<Any<'a>> for EmbeddedPdv<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for EndOfContent

type Error = Error

impl<'a> TryFrom<Any<'a>> for Enumerated

type Error = Error

impl<'a> TryFrom<Any<'a>> for GeneralName<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for GeneralString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for GeneralizedTime

type Error = Error

impl<'a> TryFrom<Any<'a>> for GraphicString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for Ia5String<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for Integer<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for Null

type Error = Error

impl<'a> TryFrom<Any<'a>> for NumericString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for ObjectDescriptor<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for OctetString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for Oid<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for PrintableString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for Real

type Error = Error

impl<'a> TryFrom<Any<'a>> for RsaAesOaepParams<'a>

type Error = X509Error

impl<'a> TryFrom<Any<'a>> for RsaSsaPssParams<'a>

type Error = X509Error

impl<'a> TryFrom<Any<'a>> for Sequence<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for Set<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for TeletexString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for UniversalString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for UtcTime

type Error = Error

impl<'a> TryFrom<Any<'a>> for Utf8String<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for VideotexString<'a>

type Error = Error

impl<'a> TryFrom<Any<'a>> for VisibleString<'a>

type Error = Error

impl<'a> TryFrom<BorrowedFormatItem<'a>> for &[BorrowedFormatItem<'a>]

type Error = DifferentVariant

impl<'a> TryFrom<Item<'a>> for BorrowedFormatItem<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'a AttributeTypeAndValue<'b>> for &'a str

type Error = X509Error

impl<'a, 'b> TryFrom<&'b AlgorithmIdentifier<'a>> for SignatureAlgorithm<'a>

type Error = X509Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for &'a str

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for bool

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for i8

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for i16

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for i32

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for i64

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for i128

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for u8

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for u16

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for u32

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for u64

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for u128

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for String

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for BitString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Boolean

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for EmbeddedPdv<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for EndOfContent

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Enumerated

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for GeneralString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for GeneralizedTime

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for GraphicString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Ia5String<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Integer<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Null

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for NumericString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for ObjectDescriptor<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for OctetString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Oid<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for PrintableString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for RsaAesOaepParams<'a>

type Error = X509Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for RsaSsaPssParams<'a>

type Error = X509Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Sequence<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Set<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for TeletexString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for UniversalString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for UtcTime

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for Utf8String<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for VideotexString<'a>

type Error = Error

impl<'a, 'b> TryFrom<&'b Any<'a>> for VisibleString<'a>

type Error = Error

impl<'a, 'b, E, T, const CLASS: u8, const TAG: u32> TryFrom<&'b Any<'a>> for TaggedValue<T, E, Implicit, CLASS, TAG>where T: TryFrom<Any<'a>, Error = E> + Tagged, E: From<Error>,

type Error = E

impl<'a, 'b, T, E, const CLASS: u8, const TAG: u32> TryFrom<&'b Any<'a>> for TaggedValue<T, E, Explicit, CLASS, TAG>where T: FromBer<'a, E>, E: From<Error>,

type Error = E

impl<'a, K, V, T> TryFrom<&'a HashMap<K, V, RandomState>> for HeaderMap<T>where K: Eq + Hash, HeaderName: TryFrom<&'a K>, <HeaderName as TryFrom<&'a K>>::Error: Into<Error>, T: TryFrom<&'a V>, <T as TryFrom<&'a V>>::Error: Into<Error>,

Try to convert a HashMap into a HeaderMap.

Examples

use std::collections::HashMap;
use std::convert::TryInto;
use http::HeaderMap;

let mut map = HashMap::new();
map.insert("X-Custom-Header".to_string(), "my value".to_string());

let headers: HeaderMap = (&map).try_into().expect("valid headers");
assert_eq!(headers["X-Custom-Header"], "my value");

type Error = Error

impl<'a, T> TryFrom<Any<'a>> for BTreeSet<T, Global>where T: FromBer<'a, Error> + Ord,

type Error = Error

impl<'a, T> TryFrom<Any<'a>> for Vec<T, Global>where T: FromBer<'a, Error>,

type Error = Error

impl<'a, T> TryFrom<Any<'a>> for HashSet<T, RandomState>where T: FromBer<'a, Error> + Hash + Eq,

type Error = Error

impl<'a, T> TryFrom<Any<'a>> for SequenceOf<T>where T: FromBer<'a, Error>,

type Error = Error

impl<'a, T> TryFrom<Any<'a>> for SetOf<T>where T: FromBer<'a, Error>,

type Error = Error

impl<'a, T, E, const CLASS: u8, const TAG: u32> TryFrom<Any<'a>> for TaggedValue<T, E, Explicit, CLASS, TAG>where T: FromBer<'a, E>, E: From<Error>,

type Error = E

impl<'a, T, E, const CLASS: u8, const TAG: u32> TryFrom<Any<'a>> for TaggedValue<T, E, Implicit, CLASS, TAG>where T: TryFrom<Any<'a>, Error = E> + Tagged, E: From<Error>,

type Error = E

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

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

impl<'ber, 'a> TryFrom<Any<'ber>> for AlgorithmIdentifier<'a>where 'ber: 'a,

type Error = X509Error

impl<'ber, 'a> TryFrom<Any<'ber>> for EcdsaSigValue<'a>where 'ber: 'a,

type Error = Error

impl<'ber, 'a> TryFrom<Any<'ber>> for PolicyMapping<'a>where 'ber: 'a,

type Error = Error

impl<T> TryFrom<Arc<T>> for UniqueArc<T>where T: ?Sized,

type Error = Arc<T>

impl<T, A, const N: usize> TryFrom<Vec<T, A>> for [T; N]where A: Allocator,

type Error = Vec<T, A>

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

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

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));

type Error = TryFromSliceError

impl<T, const N: usize> TryFrom<*const T> for TagNonNull<T, N>

type Error = Null

impl<T, const N: usize> TryFrom<*mut T> for TagNonNull<T, N>

type Error = Null

impl<T, const N: usize> TryFrom<Arc<[T]>> for Arc<[T; N]>

type Error = Arc<[T]>

impl<T, const N: usize> TryFrom<NonNull<T>> for TagNonNull<T, N>

type Error = Null

impl<T, const N: usize> TryFrom<Box<[T], Global>> for Box<[T; N], Global>

type Error = Box<[T], Global>

impl<T, const N: usize> TryFrom<Rc<[T]>> for Rc<[T; N]>

type Error = Rc<[T]>

impl<T, const N: usize> TryFrom<Vec<T, Global>> for Box<[T; N], Global>

Available on non-no_global_oom_handling only.

type Error = Vec<T, Global>

impl<T, const N: usize> TryFrom<TagPtr<T, N>> for TagNonNull<T, N>

type Error = Null