Trait kvarn::prelude::internals::prelude::utils::prelude::TryFrom

1.34.0 · source ·
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 (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§

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type Error

The type returned in the event of a conversion error.

Required Methods§

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

Performs the conversion.

Implementors§

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impl TryFrom<&str> for Uuid

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type Error = Error

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impl TryFrom<&str> for Alphabet

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type Error = ParseAlphabetError

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impl TryFrom<&str> for ServerName

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

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type Error = InvalidDnsNameError

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impl TryFrom<&String> for PathAndQuery

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impl TryFrom<&BigInt> for i8

Available on has_try_from only.
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impl TryFrom<&BigInt> for i16

Available on has_try_from only.
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impl TryFrom<&BigInt> for i32

Available on has_try_from only.
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impl TryFrom<&BigInt> for i64

Available on has_try_from only.
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impl TryFrom<&BigInt> for i128

Available on has_try_from only.
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impl TryFrom<&BigInt> for isize

Available on has_try_from only.
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impl TryFrom<&BigInt> for u8

Available on has_try_from only.
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impl TryFrom<&BigInt> for u16

Available on has_try_from only.
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impl TryFrom<&BigInt> for u32

Available on has_try_from only.
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impl TryFrom<&BigInt> for u64

Available on has_try_from only.
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impl TryFrom<&BigInt> for u128

Available on has_try_from only.
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impl TryFrom<&BigInt> for usize

Available on has_try_from only.
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impl TryFrom<&BigInt> for BigUint

Available on has_try_from only.
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impl TryFrom<&BigUint> for i8

Available on has_try_from only.
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impl TryFrom<&BigUint> for i16

Available on has_try_from only.
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impl TryFrom<&BigUint> for i32

Available on has_try_from only.
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impl TryFrom<&BigUint> for i64

Available on has_try_from only.
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impl TryFrom<&BigUint> for i128

Available on has_try_from only.
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impl TryFrom<&BigUint> for isize

Available on has_try_from only.
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impl TryFrom<&BigUint> for u8

Available on has_try_from only.
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impl TryFrom<&BigUint> for u16

Available on has_try_from only.
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impl TryFrom<&BigUint> for u32

Available on has_try_from only.
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impl TryFrom<&BigUint> for u64

Available on has_try_from only.
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impl TryFrom<&BigUint> for u128

Available on has_try_from only.
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impl TryFrom<&BigUint> for usize

Available on has_try_from only.
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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.

const: unstable · source§

impl TryFrom<i8> for u8

const: unstable · source§

impl TryFrom<i8> for u16

const: unstable · source§

impl TryFrom<i8> for u32

const: unstable · source§

impl TryFrom<i8> for u64

const: unstable · source§

impl TryFrom<i8> for u128

const: unstable · source§

impl TryFrom<i8> for usize

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impl TryFrom<i8> for NonZeroI8

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impl TryFrom<i8> for BigUint

Available on has_try_from only.
const: unstable · source§

impl TryFrom<i16> for i8

const: unstable · source§

impl TryFrom<i16> for u8

const: unstable · source§

impl TryFrom<i16> for u16

const: unstable · source§

impl TryFrom<i16> for u32

const: unstable · source§

impl TryFrom<i16> for u64

const: unstable · source§

impl TryFrom<i16> for u128

const: unstable · source§

impl TryFrom<i16> for usize

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impl TryFrom<i16> for NonZeroI16

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impl TryFrom<i16> for BigUint

Available on has_try_from only.
const: unstable · source§

impl TryFrom<i32> for i8

const: unstable · source§

impl TryFrom<i32> for i16

const: unstable · source§

impl TryFrom<i32> for isize

const: unstable · source§

impl TryFrom<i32> for u8

const: unstable · source§

impl TryFrom<i32> for u16

const: unstable · source§

impl TryFrom<i32> for u32

const: unstable · source§

impl TryFrom<i32> for u64

const: unstable · source§

impl TryFrom<i32> for u128

const: unstable · source§

impl TryFrom<i32> for usize

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impl TryFrom<i32> for NonZeroI32

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impl TryFrom<i32> for BigUint

Available on has_try_from only.
const: unstable · source§

impl TryFrom<i64> for i8

const: unstable · source§

impl TryFrom<i64> for i16

const: unstable · source§

impl TryFrom<i64> for i32

const: unstable · source§

impl TryFrom<i64> for isize

const: unstable · source§

impl TryFrom<i64> for u8

const: unstable · source§

impl TryFrom<i64> for u16

const: unstable · source§

impl TryFrom<i64> for u32

const: unstable · source§

impl TryFrom<i64> for u64

const: unstable · source§

impl TryFrom<i64> for u128

const: unstable · source§

impl TryFrom<i64> for usize

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impl TryFrom<i64> for NonZeroI64

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impl TryFrom<i64> for BigUint

Available on has_try_from only.
const: unstable · source§

impl TryFrom<i128> for i8

const: unstable · source§

impl TryFrom<i128> for i16

const: unstable · source§

impl TryFrom<i128> for i32

const: unstable · source§

impl TryFrom<i128> for i64

const: unstable · source§

impl TryFrom<i128> for isize

const: unstable · source§

impl TryFrom<i128> for u8

const: unstable · source§

impl TryFrom<i128> for u16

const: unstable · source§

impl TryFrom<i128> for u32

const: unstable · source§

impl TryFrom<i128> for u64

const: unstable · source§

impl TryFrom<i128> for u128

const: unstable · source§

impl TryFrom<i128> for usize

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impl TryFrom<i128> for NonZeroI128

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impl TryFrom<i128> for BigUint

Available on has_try_from only.
const: unstable · source§

impl TryFrom<isize> for i8

const: unstable · source§

impl TryFrom<isize> for i16

const: unstable · source§

impl TryFrom<isize> for i32

const: unstable · source§

impl TryFrom<isize> for i64

const: unstable · source§

impl TryFrom<isize> for i128

const: unstable · source§

impl TryFrom<isize> for u8

const: unstable · source§

impl TryFrom<isize> for u16

const: unstable · source§

impl TryFrom<isize> for u32

const: unstable · source§

impl TryFrom<isize> for u64

const: unstable · source§

impl TryFrom<isize> for u128

const: unstable · source§

impl TryFrom<isize> for usize

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impl TryFrom<isize> for NonZeroIsize

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impl TryFrom<isize> for BigUint

Available on has_try_from only.
const: unstable · source§

impl TryFrom<u8> for i8

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impl TryFrom<u8> for NonZeroU8

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impl TryFrom<u8> for Class

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type Error = BerClassFromIntError

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impl TryFrom<u8> for Month

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type Error = ComponentRange

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impl TryFrom<u8> for RevocationReason

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type Error = Error

const: unstable · source§

impl TryFrom<u16> for i8

const: unstable · source§

impl TryFrom<u16> for i16

const: unstable · source§

impl TryFrom<u16> for isize

const: unstable · source§

impl TryFrom<u16> for u8

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impl TryFrom<u16> for NonZeroU16

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impl TryFrom<u16> for StatusCode

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impl TryFrom<u32> for char

const: unstable · source§

impl TryFrom<u32> for i8

const: unstable · source§

impl TryFrom<u32> for i16

const: unstable · source§

impl TryFrom<u32> for i32

const: unstable · source§

impl TryFrom<u32> for isize

const: unstable · source§

impl TryFrom<u32> for u8

const: unstable · source§

impl TryFrom<u32> for u16

const: unstable · source§

impl TryFrom<u32> for usize

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impl TryFrom<u32> for NonZeroU32

const: unstable · source§

impl TryFrom<u64> for i8

const: unstable · source§

impl TryFrom<u64> for i16

const: unstable · source§

impl TryFrom<u64> for i32

const: unstable · source§

impl TryFrom<u64> for i64

const: unstable · source§

impl TryFrom<u64> for isize

const: unstable · source§

impl TryFrom<u64> for u8

const: unstable · source§

impl TryFrom<u64> for u16

const: unstable · source§

impl TryFrom<u64> for u32

const: unstable · source§

impl TryFrom<u64> for usize

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impl TryFrom<u64> for NonZeroU64

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impl TryFrom<u64> for StreamId

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type Error = InvalidStreamId

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impl TryFrom<u64> for VarInt

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type Error = VarIntBoundsExceeded

const: unstable · source§

impl TryFrom<u128> for i8

const: unstable · source§

impl TryFrom<u128> for i16

const: unstable · source§

impl TryFrom<u128> for i32

const: unstable · source§

impl TryFrom<u128> for i64

const: unstable · source§

impl TryFrom<u128> for i128

const: unstable · source§

impl TryFrom<u128> for isize

const: unstable · source§

impl TryFrom<u128> for u8

const: unstable · source§

impl TryFrom<u128> for u16

const: unstable · source§

impl TryFrom<u128> for u32

const: unstable · source§

impl TryFrom<u128> for u64

const: unstable · source§

impl TryFrom<u128> for usize

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impl TryFrom<u128> for NonZeroU128

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impl TryFrom<u128> for VarInt

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type Error = VarIntBoundsExceeded

const: unstable · source§

impl TryFrom<usize> for i8

const: unstable · source§

impl TryFrom<usize> for i16

const: unstable · source§

impl TryFrom<usize> for i32

const: unstable · source§

impl TryFrom<usize> for i64

const: unstable · source§

impl TryFrom<usize> for i128

const: unstable · source§

impl TryFrom<usize> for isize

const: unstable · source§

impl TryFrom<usize> for u8

const: unstable · source§

impl TryFrom<usize> for u16

const: unstable · source§

impl TryFrom<usize> for u32

const: unstable · source§

impl TryFrom<usize> for u64

const: unstable · source§

impl TryFrom<usize> for u128

1.46.0 · source§

impl TryFrom<usize> for NonZeroUsize

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impl TryFrom<usize> for Alignment

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impl TryFrom<usize> for VarInt

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type Error = VarIntBoundsExceeded

1.49.0 · source§

impl TryFrom<NonZeroI8> for NonZeroU8

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impl TryFrom<NonZeroI8> for NonZeroU16

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impl TryFrom<NonZeroI8> for NonZeroU32

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impl TryFrom<NonZeroI8> for NonZeroU64

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impl TryFrom<NonZeroI8> for NonZeroU128

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impl TryFrom<NonZeroI8> for NonZeroUsize

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impl TryFrom<NonZeroI16> for NonZeroI8

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impl TryFrom<NonZeroI16> for NonZeroU8

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impl TryFrom<NonZeroI16> for NonZeroU16

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impl TryFrom<NonZeroI16> for NonZeroU32

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impl TryFrom<NonZeroI16> for NonZeroU64

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impl TryFrom<NonZeroI16> for NonZeroU128

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impl TryFrom<NonZeroI16> for NonZeroUsize

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impl TryFrom<NonZeroI32> for NonZeroI8

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impl TryFrom<NonZeroI32> for NonZeroI16

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impl TryFrom<NonZeroI32> for NonZeroIsize

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impl TryFrom<NonZeroI32> for NonZeroU8

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impl TryFrom<NonZeroI32> for NonZeroU16

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impl TryFrom<NonZeroI32> for NonZeroU32

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impl TryFrom<NonZeroI32> for NonZeroU64

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impl TryFrom<NonZeroI32> for NonZeroU128

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impl TryFrom<NonZeroI32> for NonZeroUsize

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impl TryFrom<NonZeroI64> for NonZeroI8

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impl TryFrom<NonZeroI64> for NonZeroI16

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impl TryFrom<NonZeroI64> for NonZeroI32

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impl TryFrom<NonZeroI64> for NonZeroIsize

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impl TryFrom<NonZeroI64> for NonZeroU8

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impl TryFrom<NonZeroI64> for NonZeroU16

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impl TryFrom<NonZeroI64> for NonZeroU32

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impl TryFrom<NonZeroI64> for NonZeroU64

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impl TryFrom<NonZeroI64> for NonZeroU128

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impl TryFrom<NonZeroI64> for NonZeroUsize

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impl TryFrom<NonZeroI128> for NonZeroI8

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impl TryFrom<NonZeroI128> for NonZeroI16

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impl TryFrom<NonZeroI128> for NonZeroI32

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impl TryFrom<NonZeroI128> for NonZeroI64

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impl TryFrom<NonZeroI128> for NonZeroIsize

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impl TryFrom<NonZeroI128> for NonZeroU8

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impl TryFrom<NonZeroI128> for NonZeroU16

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impl TryFrom<NonZeroI128> for NonZeroU32

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impl TryFrom<NonZeroI128> for NonZeroU64

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impl TryFrom<NonZeroI128> for NonZeroU128

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impl TryFrom<NonZeroI128> for NonZeroUsize

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impl TryFrom<NonZeroIsize> for NonZeroI8

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impl TryFrom<NonZeroIsize> for NonZeroI16

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impl TryFrom<NonZeroIsize> for NonZeroI32

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impl TryFrom<NonZeroIsize> for NonZeroI64

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impl TryFrom<NonZeroIsize> for NonZeroI128

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impl TryFrom<NonZeroIsize> for NonZeroU8

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impl TryFrom<NonZeroIsize> for NonZeroU16

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impl TryFrom<NonZeroIsize> for NonZeroU32

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impl TryFrom<NonZeroIsize> for NonZeroU64

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impl TryFrom<NonZeroIsize> for NonZeroU128

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impl TryFrom<NonZeroIsize> for NonZeroUsize

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impl TryFrom<NonZeroU8> for NonZeroI8

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impl TryFrom<NonZeroU16> for NonZeroI8

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impl TryFrom<NonZeroU16> for NonZeroI16

1.49.0 · source§

impl TryFrom<NonZeroU16> for NonZeroIsize

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impl TryFrom<NonZeroU16> for NonZeroU8

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impl TryFrom<NonZeroU32> for NonZeroI8

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impl TryFrom<NonZeroU32> for NonZeroI16

1.49.0 · source§

impl TryFrom<NonZeroU32> for NonZeroI32

1.49.0 · source§

impl TryFrom<NonZeroU32> for NonZeroIsize

1.49.0 · source§

impl TryFrom<NonZeroU32> for NonZeroU8

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impl TryFrom<NonZeroU32> for NonZeroU16

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impl TryFrom<NonZeroU32> for NonZeroUsize

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impl TryFrom<NonZeroU64> for NonZeroI8

1.49.0 · source§

impl TryFrom<NonZeroU64> for NonZeroI16

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impl TryFrom<NonZeroU64> for NonZeroI32

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impl TryFrom<NonZeroU64> for NonZeroI64

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impl TryFrom<NonZeroU64> for NonZeroIsize

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impl TryFrom<NonZeroU64> for NonZeroU8

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impl TryFrom<NonZeroU64> for NonZeroU16

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impl TryFrom<NonZeroU64> for NonZeroU32

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impl TryFrom<NonZeroU64> for NonZeroUsize

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impl TryFrom<NonZeroU128> for NonZeroI8

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impl TryFrom<NonZeroU128> for NonZeroI16

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impl TryFrom<NonZeroU128> for NonZeroI32

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impl TryFrom<NonZeroU128> for NonZeroI64

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impl TryFrom<NonZeroU128> for NonZeroI128

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impl TryFrom<NonZeroU128> for NonZeroIsize

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impl TryFrom<NonZeroU128> for NonZeroU8

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impl TryFrom<NonZeroU128> for NonZeroU16

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impl TryFrom<NonZeroU128> for NonZeroU32

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impl TryFrom<NonZeroU128> for NonZeroU64

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impl TryFrom<NonZeroU128> for NonZeroUsize

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impl TryFrom<NonZeroUsize> for NonZeroI8

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impl TryFrom<NonZeroUsize> for NonZeroI16

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impl TryFrom<NonZeroUsize> for NonZeroI32

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impl TryFrom<NonZeroUsize> for NonZeroI64

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impl TryFrom<NonZeroUsize> for NonZeroI128

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impl TryFrom<NonZeroUsize> for NonZeroIsize

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impl TryFrom<NonZeroUsize> for NonZeroU8

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impl TryFrom<NonZeroUsize> for NonZeroU16

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impl TryFrom<NonZeroUsize> for NonZeroU32

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impl TryFrom<NonZeroUsize> for NonZeroU64

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impl TryFrom<NonZeroUsize> for NonZeroU128

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impl TryFrom<NonZeroUsize> for Alignment

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impl TryFrom<Duration> for Duration

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type Error = ConversionRange

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impl TryFrom<Duration> for IdleTimeout

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type Error = VarIntBoundsExceeded

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impl TryFrom<TcpListener> for TcpListener

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type Error = Error

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impl TryFrom<TcpStream> for TcpStream

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type Error = Error

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impl TryFrom<UdpSocket> for UdpSocket

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type Error = Error

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impl TryFrom<Parts> for Uri

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impl TryFrom<String> for HeaderName

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impl TryFrom<String> for HeaderValue

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impl TryFrom<String> for Authority

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impl TryFrom<String> for PathAndQuery

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impl TryFrom<String> for Uri

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impl TryFrom<String> for DnsName

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type Error = InvalidDnsNameError

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

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

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

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impl TryFrom<UnixDatagram> for UnixDatagram

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type Error = Error

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impl TryFrom<UnixListener> for UnixListener

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type Error = Error

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impl TryFrom<UnixStream> for UnixStream

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type Error = Error

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impl TryFrom<SystemTime> for Time

Available on crate feature std only.
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impl TryFrom<BigInt> for i8

Available on has_try_from only.
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impl TryFrom<BigInt> for i16

Available on has_try_from only.
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impl TryFrom<BigInt> for i32

Available on has_try_from only.
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impl TryFrom<BigInt> for i64

Available on has_try_from only.
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impl TryFrom<BigInt> for i128

Available on has_try_from only.
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impl TryFrom<BigInt> for isize

Available on has_try_from only.
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impl TryFrom<BigInt> for u8

Available on has_try_from only.
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impl TryFrom<BigInt> for u16

Available on has_try_from only.
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impl TryFrom<BigInt> for u32

Available on has_try_from only.
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impl TryFrom<BigInt> for u64

Available on has_try_from only.
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impl TryFrom<BigInt> for u128

Available on has_try_from only.
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impl TryFrom<BigInt> for usize

Available on has_try_from only.
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impl TryFrom<BigInt> for BigUint

Available on has_try_from only.
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impl TryFrom<BigUint> for i8

Available on has_try_from only.
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impl TryFrom<BigUint> for i16

Available on has_try_from only.
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impl TryFrom<BigUint> for i32

Available on has_try_from only.
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impl TryFrom<BigUint> for i64

Available on has_try_from only.
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impl TryFrom<BigUint> for i128

Available on has_try_from only.
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impl TryFrom<BigUint> for isize

Available on has_try_from only.
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impl TryFrom<BigUint> for u8

Available on has_try_from only.
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impl TryFrom<BigUint> for u16

Available on has_try_from only.
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impl TryFrom<BigUint> for u32

Available on has_try_from only.
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impl TryFrom<BigUint> for u64

Available on has_try_from only.
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impl TryFrom<BigUint> for u128

Available on has_try_from only.
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impl TryFrom<BigUint> for usize

Available on has_try_from only.
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impl TryFrom<BorrowedFormatItem<'_>> for Component

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type Error = DifferentVariant

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

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type Error = ConversionRange

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impl TryFrom<Error> for ComponentRange

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type Error = DifferentVariant

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impl TryFrom<Error> for ConversionRange

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type Error = DifferentVariant

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impl TryFrom<Error> for DifferentVariant

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type Error = DifferentVariant

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impl TryFrom<Error> for Format

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type Error = DifferentVariant

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impl TryFrom<Error> for IndeterminateOffset

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type Error = DifferentVariant

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impl TryFrom<Error> for InvalidFormatDescription

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type Error = DifferentVariant

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impl TryFrom<Error> for InvalidVariant

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type Error = DifferentVariant

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impl TryFrom<Error> for Parse

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type Error = DifferentVariant

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impl TryFrom<Error> for ParseFromDescription

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type Error = DifferentVariant

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impl TryFrom<Error> for TryFromParsed

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type Error = DifferentVariant

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impl TryFrom<Format> for Error

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type Error = DifferentVariant

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impl TryFrom<Integer<'_>> for i8

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type Error = Error

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impl TryFrom<Integer<'_>> for i16

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type Error = Error

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impl TryFrom<Integer<'_>> for i32

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type Error = Error

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impl TryFrom<Integer<'_>> for i64

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type Error = Error

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impl TryFrom<Integer<'_>> for i128

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type Error = Error

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impl TryFrom<Integer<'_>> for u8

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type Error = Error

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impl TryFrom<Integer<'_>> for u16

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type Error = Error

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impl TryFrom<Integer<'_>> for u32

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type Error = Error

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impl TryFrom<Integer<'_>> for u64

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type Error = Error

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impl TryFrom<Integer<'_>> for u128

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type Error = Error

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impl TryFrom<Message> for String

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type Error = Error

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

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type Error = DifferentVariant

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impl TryFrom<OwnedFormatItem> for Component

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type Error = DifferentVariant

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impl TryFrom<Parse> for ParseFromDescription

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type Error = DifferentVariant

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impl TryFrom<Parse> for TryFromParsed

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type Error = DifferentVariant

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impl TryFrom<Parsed> for OffsetDateTime

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

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impl TryFrom<Parsed> for Date

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type Error = TryFromParsed

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impl TryFrom<Parsed> for PrimitiveDateTime

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

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impl TryFrom<Parsed> for Time

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type Error = TryFromParsed

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impl TryFrom<Parsed> for UtcOffset

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type Error = TryFromParsed

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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].

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type Error = Error

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impl TryFrom<TryFromParsed> for ComponentRange

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type Error = DifferentVariant

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

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

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

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

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

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

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

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

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

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type Error = Error

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

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

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

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impl<'a> TryFrom<&'a Certificate> for ParsedCertificate<'a>

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type Error = Error

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

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

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

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

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

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

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

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

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

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type Error = Error

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

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

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

§

type Error = Error

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

§

type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = X509Error

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

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type Error = X509Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = DifferentVariant

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

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type Error = Error

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

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type Error = X509Error

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

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type Error = X509Error

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

§

type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

§

type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

§

type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

§

type Error = Error

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

§

type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

§

type Error = Error

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

§

type Error = Error

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

§

type Error = Error

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

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type Error = X509Error

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

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type Error = X509Error

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

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type Error = Error

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

§

type Error = Error

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

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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

§

type Error = Error

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

§

type Error = Error

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

§

type Error = Error

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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>,

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type Error = E

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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>,

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type Error = E

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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");
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type Error = Error

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

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type Error = Error

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

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type Error = Error

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

§

type Error = Error

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

§

type Error = Error

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

§

type Error = Error

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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>,

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type Error = E

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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>,

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type Error = E

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

§

type Error = X509Error

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

§

type Error = Error

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

§

type Error = Error

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

§

type Error = Arc<T>

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impl<T, A> TryFrom<&[T]> for ArrayVec<A>where T: Clone + Default, A: Array<Item = T>,

§

type Error = TryFromSliceError

1.48.0 · source§

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

§

type Error = Vec<T, A>

const: unstable · source§

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

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.

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));
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.

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

§

type Error = Null

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

§

type Error = Null

§

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

§

type Error = Null

1.43.0 · source§

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

§

type Error = Arc<[T]>

1.43.0 · source§

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

1.43.0 · source§

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

§

type Error = Rc<[T]>

1.66.0 · source§

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