Trait gstd::prelude::convert::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<&[u8]> for ActorId

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type Error = Error

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impl TryFrom<&[u8]> for CodeId

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type Error = Error

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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.

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impl TryFrom<i8> for u8

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impl TryFrom<i8> for u16

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impl TryFrom<i8> for u32

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impl TryFrom<i8> for u64

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impl TryFrom<i8> for u128

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impl TryFrom<i8> for usize

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impl TryFrom<i8> for NonZeroI8

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impl TryFrom<i16> for i8

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impl TryFrom<i16> for u8

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impl TryFrom<i16> for u16

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impl TryFrom<i16> for u32

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impl TryFrom<i16> for u64

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impl TryFrom<i16> for u128

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impl TryFrom<i16> for usize

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impl TryFrom<i16> for NonZeroI16

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impl TryFrom<i32> for i8

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impl TryFrom<i32> for i16

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impl TryFrom<i32> for isize

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impl TryFrom<i32> for u8

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impl TryFrom<i32> for u16

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impl TryFrom<i32> for u32

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impl TryFrom<i32> for u64

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impl TryFrom<i32> for u128

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impl TryFrom<i32> for usize

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impl TryFrom<i32> for NonZeroI32

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impl TryFrom<i64> for i8

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impl TryFrom<i64> for i16

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impl TryFrom<i64> for i32

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impl TryFrom<i64> for isize

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impl TryFrom<i64> for u8

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impl TryFrom<i64> for u16

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impl TryFrom<i64> for u32

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impl TryFrom<i64> for u64

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impl TryFrom<i64> for u128

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impl TryFrom<i64> for usize

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impl TryFrom<i64> for NonZeroI64

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impl TryFrom<i128> for i8

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impl TryFrom<i128> for i16

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impl TryFrom<i128> for i32

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impl TryFrom<i128> for i64

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impl TryFrom<i128> for isize

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impl TryFrom<i128> for u8

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impl TryFrom<i128> for u16

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impl TryFrom<i128> for u32

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impl TryFrom<i128> for u64

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impl TryFrom<i128> for u128

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impl TryFrom<i128> for usize

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impl TryFrom<i128> for NonZeroI128

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impl TryFrom<isize> for i8

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impl TryFrom<isize> for i16

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impl TryFrom<isize> for i32

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impl TryFrom<isize> for i64

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impl TryFrom<isize> for i128

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impl TryFrom<isize> for u8

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impl TryFrom<isize> for u16

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impl TryFrom<isize> for u32

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impl TryFrom<isize> for u64

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impl TryFrom<isize> for u128

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impl TryFrom<isize> for usize

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impl TryFrom<isize> for NonZeroIsize

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impl TryFrom<u8> for i8

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impl TryFrom<u8> for NonZeroU8

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impl TryFrom<u16> for i8

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impl TryFrom<u16> for i16

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impl TryFrom<u16> for isize

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impl TryFrom<u16> for u8

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impl TryFrom<u16> for NonZeroU16

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impl TryFrom<u32> for char

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impl TryFrom<u32> for i8

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impl TryFrom<u32> for i16

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impl TryFrom<u32> for i32

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impl TryFrom<u32> for isize

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impl TryFrom<u32> for u8

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impl TryFrom<u32> for u16

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impl TryFrom<u32> for usize

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impl TryFrom<u32> for NonZeroU32

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impl TryFrom<u64> for i8

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impl TryFrom<u64> for i16

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impl TryFrom<u64> for i32

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impl TryFrom<u64> for i64

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impl TryFrom<u64> for isize

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impl TryFrom<u64> for u8

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impl TryFrom<u64> for u16

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impl TryFrom<u64> for u32

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impl TryFrom<u64> for usize

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impl TryFrom<u64> for NonZeroU64

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impl TryFrom<u128> for i8

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impl TryFrom<u128> for i16

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impl TryFrom<u128> for i32

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impl TryFrom<u128> for i64

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impl TryFrom<u128> for i128

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impl TryFrom<u128> for isize

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impl TryFrom<u128> for u8

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impl TryFrom<u128> for u16

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impl TryFrom<u128> for u32

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impl TryFrom<u128> for u64

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impl TryFrom<u128> for usize

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impl TryFrom<u128> for NonZeroU128

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impl TryFrom<usize> for i8

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impl TryFrom<usize> for i16

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impl TryFrom<usize> for i32

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impl TryFrom<usize> for i64

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impl TryFrom<usize> for i128

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impl TryFrom<usize> for isize

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impl TryFrom<usize> for u8

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impl TryFrom<usize> for u16

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impl TryFrom<usize> for u32

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impl TryFrom<usize> for u64

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impl TryFrom<usize> for u128

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impl TryFrom<usize> for NonZeroUsize

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impl TryFrom<usize> for Alignment

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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

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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

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impl TryFrom<NonZeroU32> for NonZeroI32

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impl TryFrom<NonZeroU32> for NonZeroIsize

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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

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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<U128> for i8

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type Error = &'static str

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impl TryFrom<U128> for i16

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type Error = &'static str

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impl TryFrom<U128> for i32

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type Error = &'static str

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impl TryFrom<U128> for i64

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type Error = &'static str

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impl TryFrom<U128> for i128

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type Error = &'static str

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impl TryFrom<U128> for isize

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type Error = &'static str

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impl TryFrom<U128> for u8

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type Error = &'static str

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impl TryFrom<U128> for u16

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type Error = &'static str

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impl TryFrom<U128> for u32

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type Error = &'static str

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impl TryFrom<U128> for u64

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type Error = &'static str

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impl TryFrom<U128> for u128

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type Error = &'static str

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impl TryFrom<U128> for usize

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type Error = &'static str

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impl TryFrom<U256> for i8

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type Error = &'static str

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impl TryFrom<U256> for i16

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type Error = &'static str

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impl TryFrom<U256> for i32

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type Error = &'static str

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impl TryFrom<U256> for i64

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type Error = &'static str

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impl TryFrom<U256> for i128

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type Error = &'static str

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impl TryFrom<U256> for isize

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type Error = &'static str

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impl TryFrom<U256> for u8

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type Error = &'static str

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impl TryFrom<U256> for u16

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type Error = &'static str

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impl TryFrom<U256> for u32

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type Error = &'static str

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impl TryFrom<U256> for u64

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type Error = &'static str

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impl TryFrom<U256> for u128

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type Error = &'static str

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impl TryFrom<U256> for usize

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type Error = &'static str

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impl TryFrom<U256> for U128

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type Error = Error

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impl TryFrom<U512> for i8

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type Error = &'static str

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impl TryFrom<U512> for i16

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type Error = &'static str

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impl TryFrom<U512> for i32

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type Error = &'static str

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impl TryFrom<U512> for i64

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type Error = &'static str

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impl TryFrom<U512> for i128

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type Error = &'static str

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impl TryFrom<U512> for isize

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type Error = &'static str

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impl TryFrom<U512> for u8

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type Error = &'static str

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impl TryFrom<U512> for u16

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type Error = &'static str

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impl TryFrom<U512> for u32

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type Error = &'static str

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impl TryFrom<U512> for u64

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type Error = &'static str

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impl TryFrom<U512> for u128

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type Error = &'static str

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impl TryFrom<U512> for usize

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type Error = &'static str

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impl TryFrom<U512> for U128

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type Error = Error

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impl TryFrom<U512> for U256

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type Error = Error

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impl<'a> TryFrom<&'a U512> for U256

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type Error = Error

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impl<'a, T, O> TryFrom<&'a [T]> for &'a BitSlice<T, O>where T: BitStore, O: BitOrder,

Calls BitSlice::try_from_slice, but returns the original Rust slice on error instead of the failure event.

This only fails if slice.len() exceeds BitSlice::MAX_ELTS.

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type Error = &'a [T]

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impl<'a, T, O> TryFrom<&'a mut [T]> for &'a mut BitSlice<T, O>where T: BitStore, O: BitOrder,

Calls BitSlice::try_from_slice_mut, but returns the original Rust slice on error instead of the failure event.

This only fails if slice.len() exceeds BitSlice::MAX_ELTS.

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type Error = &'a mut [T]

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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<'a, const CAP: usize> TryFrom<&'a str> for ArrayString<CAP>

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impl<'a, const CAP: usize> TryFrom<Arguments<'a>> for ArrayString<CAP>

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impl<A, O> TryFrom<&BitSlice<<A as BitView>::Store, O>> for &BitArray<A, O>where A: BitViewSized, O: BitOrder,

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type Error = TryFromBitSliceError

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impl<A, O> TryFrom<&BitSlice<<A as BitView>::Store, O>> for BitArray<A, O>where A: BitViewSized, O: BitOrder,

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type Error = TryFromBitSliceError

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impl<A, O> TryFrom<&mut BitSlice<<A as BitView>::Store, O>> for &mut BitArray<A, O>where A: BitViewSized, O: BitOrder,

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type Error = TryFromBitSliceError

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impl<T> TryFrom<*const T> for Address<Const, T>where T: ?Sized,

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type Error = NullPtrError

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impl<T> TryFrom<*mut T> for Address<Mut, T>where T: ?Sized,

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type Error = NullPtrError

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

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type Error = Vec<T, A>

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

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type Error = Box<[T], A>

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

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type Error = Vec<T, A>

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impl<T, O> TryFrom<*const T> for BitPtr<Const, T, O>where T: BitStore, O: BitOrder,

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type Error = BitPtrError<T>

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impl<T, O> TryFrom<*mut T> for BitPtr<Mut, T, O>where T: BitStore, O: BitOrder,

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type Error = BitPtrError<T>

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impl<T, O> TryFrom<Box<[T], Global>> for BitBox<T, O>where T: BitStore, O: BitOrder,

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impl<T, O> TryFrom<Vec<T, Global>> for BitVec<T, O>where T: BitStore, O: BitOrder,

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type Error = Vec<T, Global>

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

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impl<T, const CAP: usize> TryFrom<&[T]> for ArrayVec<T, CAP>where T: Clone,

Try to create an ArrayVec from a slice. This will return an error if the slice was too big to fit.

use arrayvec::ArrayVec;
use std::convert::TryInto as _;

let array: ArrayVec<_, 4> = (&[1, 2, 3] as &[_]).try_into().unwrap();
assert_eq!(array.len(), 3);
assert_eq!(array.capacity(), 4);
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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));
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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));
1.43.0 · source§

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

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type Error = Rc<[T]>

1.43.0 · source§

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

1.66.0 · source§

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

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type Error = Vec<T, Global>

1.43.0 · source§

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

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type Error = Arc<[T]>