Trait std::convert::TryFrom 1.34.0[−][src]
Expand description
简单安全的类型转换在某些情况下可能会以受控方式失败。它是 TryInto 的倒数。
当您进行的类型转换可能会成功完成但可能还需要特殊处理时，这很有用。
例如，无法使用 From trait 将 i64 转换为 i32，因为 i64 可能包含 i32 无法表示的值，因此转换将丢失数据。
这可以通过将 i64 截断为 i32 (本质上给 i64 的值取 i32::MAX 模) 或通过简单地返回 i32::MAX 或其他方法来处理。
From trait 用于完美的转换，因此 TryFrom trait 会通知程序员类型转换何时会变差，并让他们决定如何处理它。
泛型实现
TryFrom<T> for U暗示TryInto<U> for Ttry_from是自反的，这意味着TryFrom<T> for T已实现且不会失败 - 用于在T类型的值上调用T::try_from()的关联Error类型为Infallible。 当!类型稳定后，Infallible和!将等效。
TryFrom<T> 可以实现如下:
use std::convert::TryFrom; 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 value superior than zero!") } else { Ok(GreaterThanZero(value)) } } }Run
Examples
use std::convert::TryFrom; let big_number = 1_000_000_000_000i64; // 默默地截断 `big_number`，事实之后需要检测并处理该截断。 let smaller_number = big_number as i32; assert_eq!(smaller_number, -727379968); // 由于 `big_number` 太大而无法容纳在 `i32` 中，因此返回错误。 let try_smaller_number = i32::try_from(big_number); assert!(try_smaller_number.is_err()); // 返回 `Ok(3)`。 let try_successful_smaller_number = i32::try_from(3); assert!(try_successful_smaller_number.is_ok());Run
Associated Types
Required methods
Implementors
Attempts to convert i16 to NonZeroI16.
type Error = TryFromIntError
Attempts to convert i32 to NonZeroI32.
type Error = TryFromIntError
Attempts to convert i64 to NonZeroI64.
type Error = TryFromIntError
Attempts to convert i128 to NonZeroI128.
type Error = TryFromIntError
pub fn try_from(
value: isize
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<isize>>::Error>
[src]
pub fn try_from(
value: isize
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<isize>>::Error>
[src]Attempts to convert isize to NonZeroIsize.
type Error = TryFromIntError
Attempts to convert u16 to NonZeroU16.
type Error = TryFromIntError
Attempts to convert u32 to NonZeroU32.
type Error = TryFromIntError
Attempts to convert u64 to NonZeroU64.
type Error = TryFromIntError
Attempts to convert u128 to NonZeroU128.
type Error = TryFromIntError
pub fn try_from(
value: usize
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<usize>>::Error>
[src]
pub fn try_from(
value: usize
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<usize>>::Error>
[src]Attempts to convert usize to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>
[src]
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI8>>::Error>
[src]Attempts to convert NonZeroI8 to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI8>>::Error>
[src]
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI8>>::Error>
[src]Attempts to convert NonZeroI8 to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI8>>::Error>
[src]
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI8>>::Error>
[src]Attempts to convert NonZeroI8 to NonZeroU64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI8>>::Error>
[src]
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI8>>::Error>
[src]Attempts to convert NonZeroI8 to NonZeroU128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>
[src]
pub fn try_from(
value: NonZeroI8
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI8>>::Error>
[src]Attempts to convert NonZeroI8 to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16 to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16 to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16 to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16 to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16 to NonZeroU64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16 to NonZeroU128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI16>>::Error>
[src]
pub fn try_from(
value: NonZeroI16
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI16>>::Error>
[src]Attempts to convert NonZeroI16 to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroIsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroU64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroU128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI32>>::Error>
[src]
pub fn try_from(
value: NonZeroI32
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI32>>::Error>
[src]Attempts to convert NonZeroI32 to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroI32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroIsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroU64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroU128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI64>>::Error>
[src]
pub fn try_from(
value: NonZeroI64
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI64>>::Error>
[src]Attempts to convert NonZeroI64 to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroI32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroI64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroIsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroU64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroU128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI128>>::Error>
[src]
pub fn try_from(
value: NonZeroI128
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI128>>::Error>
[src]Attempts to convert NonZeroI128 to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroI32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroI64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroI128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroU64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroU128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroIsize>>::Error>
[src]
pub fn try_from(
value: NonZeroIsize
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroIsize>>::Error>
[src]Attempts to convert NonZeroIsize to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU16>>::Error>
[src]
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU16>>::Error>
[src]Attempts to convert NonZeroU16 to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU16>>::Error>
[src]
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU16>>::Error>
[src]Attempts to convert NonZeroU16 to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU16>>::Error>
[src]
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU16>>::Error>
[src]Attempts to convert NonZeroU16 to NonZeroIsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU16>>::Error>
[src]
pub fn try_from(
value: NonZeroU16
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU16>>::Error>
[src]Attempts to convert NonZeroU16 to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32 to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32 to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32 to NonZeroI32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32 to NonZeroIsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32 to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32 to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU32>>::Error>
[src]
pub fn try_from(
value: NonZeroU32
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU32>>::Error>
[src]Attempts to convert NonZeroU32 to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroI32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroI64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroIsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU64>>::Error>
[src]
pub fn try_from(
value: NonZeroU64
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU64>>::Error>
[src]Attempts to convert NonZeroU64 to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroI32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroI64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroI128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroIsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroU64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU128>>::Error>
[src]
pub fn try_from(
value: NonZeroU128
) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroU128>>::Error>
[src]Attempts to convert NonZeroU128 to NonZeroUsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroI8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroI16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroI32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroI64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroI128.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroIsize.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroU8.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroU16.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroU32.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroU64.
type Error = TryFromIntError
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroUsize>>::Error>
[src]
pub fn try_from(
value: NonZeroUsize
) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroUsize>>::Error>
[src]Attempts to convert NonZeroUsize to NonZeroU128.
type Error = TryFromIntError
type Error = TryFromSliceError
type Error = TryFromSliceError
type Error = TryFromSliceError
如果 Vec<T> 的大小与请求的数组的大小完全匹配，则以数组的形式获取 Vec<T> 的全部内容。
Examples
use std::convert::TryInto; assert_eq!(vec![1, 2, 3].try_into(), Ok([1, 2, 3])); assert_eq!(<Vec<i32>>::new().try_into(), Ok([]));Run
如果长度不匹配，则输入以 Err 返回:
use std::convert::TryInto; let r: Result<[i32; 4], _> = (0..10).collect::<Vec<_>>().try_into(); assert_eq!(r, Err(vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9]));Run
如果只需要获得 Vec<T> 的前缀就可以了，您可以先调用 .truncate(N)。
use std::convert::TryInto; let mut v = String::from("hello world").into_bytes(); v.sort(); v.truncate(2); let [a, b]: [_; 2] = v.try_into().unwrap(); assert_eq!(a, b' '); assert_eq!(b, b'd');Run