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Trait std::convert::From ​

用于将T类型的值转化为Self类型的值，它是 Into 的倒数。

rust
pub trait From<T>: Sized {
    // Required method
    fn from(value: T) -> Self;
}

TIP

注意：此 trait 一定不能失败。From trait 旨在实现完美转换。 如果转换失败或不完美，使用 TryFrom。

泛型实现 ​

  • From<T> for U 意味着 Into<U> for T
  • From 是反射的，这意味着 From<T> for T 被实现

常见的有&str转化为String

rust
let other_string = String::from("hello");

在执行错误处理时，通常对于您自己的错误类型实现 From 很有用。 通过将底层错误类型转换为封装底层错误类型的自定义错误类型，我们可以返回单个错误类型，而不会丢失有关底层原因的信息。 ?运算符通过调用 Into<CliError>::into 自动将底层错误类型转换为我们的自定义错误类型，该 Into<CliError>::into 是在实现 From 时自动提供的。 然后，编译器会推断应使用 Into 的哪种实现。

rust
use std::fs;
use std::io;
use std::num;

enum CliError {
    IoError(io::Error),
    ParseError(num::ParseIntError),
}

impl From<io::Error> for CliError {
    fn from(error: io::Error) -> Self {
        CliError::IoError(error)
    }
}

impl From<num::ParseIntError> for CliError {
    fn from(error: num::ParseIntError) -> Self {
        CliError::ParseError(error)
    }
}

fn open_and_parse_file(file_name: &str) -> Result<i32, CliError> {
    let mut contents = fs::read_to_string(&file_name)?;
    let num: i32 = contents.trim().parse()?;
    Ok(num)
}

Required Methods ​

from ​

从输入类型转换为此类型。

rust
fn from(value: T) -> Self

为自定义类型实现From ​

rust
struct People {
    name: String,
}
impl From<String> for People {
    fn from(value: String) -> Self {
        Self { name: value }
    }
}

impl From<&str> for People {
    fn from(value: &str) -> Self {
        Self {
            name: value.to_string(),
        }
    }
}

fn main() {
    let name = "ikun";
    let p1 = People::from(name);
    println!("{:#?}", p1.name); // "ikun"

    let name = String::from("xarzhi");
    let p2 = People::from(name);
    println!("{:#?}", p2.name); // "xarzhi"
}

Implementors ​

impl From<&str> for Box<str, Global> ​

impl From<&str> for Box<dyn Error + 'static, Global> ​

impl From<&str> for Rc<str> ​

impl From<&str> for String ​

impl From<&str> for Arc<str> ​

impl From<&str> for Vec<u8, Global> ​

impl From<&CStr> for Box<CStr, Global> ​

impl From<&CStr> for CString ​

impl From<&CStr> for Rc<CStr> ​

impl From<&CStr> for Arc<CStr> ​

impl From<&OsStr> for Box<OsStr> ​

impl From<&OsStr> for Rc<OsStr> ​

impl From<&OsStr> for Arc<OsStr> ​

impl From<&Path> for Box<Path> ​

impl From<&Path> for Rc<Path> ​

impl From<&Path> for Arc<Path> ​

impl From<&String> for String ​

impl From<&mut str> for String ​

impl From<Cow<'_, str>> for Box<str, Global> ​

impl From<Cow<'_, CStr>> for Box<CStr, Global> ​

impl From<Cow<'_, OsStr>> for Box<OsStr> ​

impl From<Cow<'_, Path>> for Box<Path> ​

impl From<TryReserveErrorKind> for TryReserveError ​

impl From<ErrorKind> for Error ​

旨在用于未暴露给用户的错误，因为分配到堆上 (通过 Error::new 进行常规构建) 的代价太高了。

impl From<Infallible> for TryFromSliceError ​

impl From<Infallible> for TryFromIntError ​

impl From<bool> for f32 ​

impl From<bool> for f64 ​

impl From<bool> for i8 ​

impl From<bool> for i16 ​

impl From<bool> for i32 ​

impl From<bool> for i64 ​

impl From<bool> for i128 ​

impl From<bool> for isize ​

impl From<bool> for u8 ​

impl From<bool> for u16 ​

impl From<bool> for u32 ​

impl From<bool> for u64 ​

impl From<bool> for u128 ​

impl From<bool> for usize ​

impl From<bool> for AtomicBool ​

impl From<char> for u32 ​

impl From<char> for u64 ​

impl From<char> for u128 ​

impl From<char> for String ​

impl From<f32> for f64 ​

impl From<i8> for f32 ​

impl From<i8> for f64 ​

impl From<i8> for i16 ​

impl From<i8> for i32 ​

impl From<i8> for i64 ​

impl From<i8> for i128 ​

impl From<i8> for isize ​

impl From<i8> for AtomicI8 ​

impl From<i16> for f32 ​

impl From<i16> for f64 ​

impl From<i16> for i32 ​

impl From<i16> for i64 ​

impl From<i16> for i128 ​

impl From<i16> for isize ​

impl From<i16> for AtomicI16 ​

impl From<i32> for f64 ​

impl From<i32> for i64 ​

impl From<i32> for i128 ​

impl From<i32> for AtomicI32 ​

impl From<i64> for i128 ​

impl From<i64> for AtomicI64 ​

impl From<isize> for AtomicIsize ​

impl From<!> for Infallible ​

impl From<!> for TryFromIntError ​

impl From<u8> for char ​

将 0x00..=0xFF 中的字节映射到 char，该 char 的代码点具有相同的值，即 U+0000..=U+00FF。

Unicode 的设计使其可以使用 IANA 称为 ISO-8859-1 的字符编码有效地解码字节。 此编码与 ASCII 兼容。

请注意，这与 ISO/IEC 8859-1 又名不同 ISO 8859-1 (连字符少一个)，它留下了一些 “blanks” 字节值，这些值未分配给任何字符。 ISO-8859-1 (属于 IANA) 将它们分配给 C0 和 C1 控制代码。

请注意，这也与 Windows-1252 也不同 代码页 1252，它是 ISO/IEC 8859-1 的超集，它为标点符号和各种拉丁字符分配了一些 (不是全部) 空格。

为了进一步混淆，在 Web 上 ascii，iso-8859-1 和 windows-1252 都是 Windows-1252 超集的别名，该超集用相应的 C0 和 C1 控制代码填充了其余的空白。

​

impl From<u8> for f32 ​

impl From<u8> for f64 ​

impl From<u8> for i16 ​

impl From<u8> for i32 ​

impl From<u8> for i64 ​

impl From<u8> for i128 ​

impl From<u8> for isize ​

impl From<u8> for u16 ​

impl From<u8> for u32 ​

impl From<u8> for u64 ​

impl From<u8> for u128 ​

impl From<u8> for usize ​

impl From<u8> for ExitCode ​

impl From<u8> for AtomicU8 ​

impl From<u16> for f32 ​

impl From<u16> for f64 ​

impl From<u16> for i32 ​

impl From<u16> for i64 ​

impl From<u16> for i128 ​

impl From<u16> for u32 ​

impl From<u16> for u64 ​

impl From<u16> for u128 ​

impl From<u16> for usize ​

impl From<u16> for AtomicU16 ​

impl From<u32> for f64 ​

impl From<u32> for i64 ​

impl From<u32> for i128 ​

impl From<u32> for u64 ​

impl From<u32> for u128 ​

impl From<u32> for Ipv4Addr ​

impl From<u32> for AtomicU32 ​

impl From<u64> for i128 ​

impl From<u64> for u128 ​

impl From<u64> for AtomicU64 ​

impl From<u128> for Ipv6Addr ​

impl From<usize> for AtomicUsize ​

impl From<__m128> for Simd<f32, 4> ​

impl From<__m128d> for Simd<f64, 2> ​

impl From<__m128i> for Simd<i8, 16> ​

impl From<__m128i> for Simd<i16, 8> ​

impl From<__m128i> for Simd<i32, 4> ​

impl From<__m128i> for Simd<i64, 2> ​

impl From<__m128i> for Simd<isize, 2> ​

impl From<__m128i> for Simd<u8, 16> ​

impl From<__m128i> for Simd<u16, 8> ​

impl From<__m128i> for Simd<u32, 4> ​

impl From<__m128i> for Simd<u64, 2> ​

impl From<__m128i> for Simd<usize, 2> ​

impl From<__m256> for Simd<f32, 8> ​

impl From<__m256d> for Simd<f64, 4> ​

impl From<__m256i> for Simd<i8, 32> ​

impl From<__m256i> for Simd<i16, 16> ​

impl From<__m256i> for Simd<i32, 8> ​

impl From<__m256i> for Simd<i64, 4> ​

impl From<__m256i> for Simd<isize, 4> ​

impl From<__m256i> for Simd<u8, 32> ​

impl From<__m256i> for Simd<u16, 16> ​

impl From<__m256i> for Simd<u32, 8> ​

impl From<__m256i> for Simd<u64, 4> ​

impl From<__m256i> for Simd<usize, 4> ​

impl From<__m512> for Simd<f32, 16> ​

impl From<__m512d> for Simd<f64, 8> ​

impl From<__m512i> for Simd<i8, 64> ​

impl From<__m512i> for Simd<i16, 32> ​

impl From<__m512i> for Simd<i32, 16> ​

impl From<__m512i> for Simd<i64, 8> ​

impl From<__m512i> for Simd<isize, 8> ​

impl From<__m512i> for Simd<u8, 64> ​

impl From<__m512i> for Simd<u16, 32> ​

impl From<__m512i> for Simd<u32, 16> ​

impl From<__m512i> for Simd<u64, 8> ​

impl From<__m512i> for Simd<usize, 8> ​

impl From<LayoutError> for TryReserveErrorKind ​

impl From<Box<str, Global>> for String ​

impl From<Box<CStr, Global>> for CString ​

impl From<Box<OsStr, Global>> for OsString ​

impl From<Box<Path, Global>> for PathBuf ​

impl From<CString> for Box<CStr, Global> ​

impl From<CString> for Rc<CStr> ​

impl From<CString> for Arc<CStr> ​

impl From<CString> for Vec<u8, Global> ​

impl From<NulError> for Error ​

​

impl From<OsString> for Box<OsStr> ​

​

impl From<OsString> for PathBuf ​

​

impl From<OsString> for Rc<OsStr> ​

​

impl From<OsString> for Arc<OsStr> ​

​

impl From<File> for OwnedFd ​

​

impl From<File> for OwnedHandle ​

Available on Windows only.

impl From<File> for Stdio ​

impl From<Ipv4Addr> for IpAddr ​

impl From<Ipv4Addr> for u32 ​

impl From<Ipv6Addr> for IpAddr ​

impl From<Ipv6Addr> for u128 ​

impl From<SocketAddrV4> for SocketAddr ​

impl From<SocketAddrV6> for SocketAddr ​

impl From<TcpListener> for OwnedFd ​

impl From<TcpListener> for OwnedSocket ​

Available on Windows only.

impl From<TcpStream> for OwnedFd ​

impl From<TcpStream> for OwnedSocket ​

Available on Windows only.

impl From<UdpSocket> for OwnedFd ​

impl From<UdpSocket> for OwnedSocket ​

Available on Windows only.

impl From<NonZeroI8> for i8 ​

impl From<NonZeroI8> for NonZeroI16 ​

impl From<NonZeroI8> for NonZeroI32 ​

impl From<NonZeroI8> for NonZeroI64 ​

impl From<NonZeroI8> for NonZeroI128 ​

impl From<NonZeroI8> for NonZeroIsize ​

impl From<NonZeroI16> for i16 ​

impl From<NonZeroI16> for NonZeroI32 ​

impl From<NonZeroI16> for NonZeroI64 ​

impl From<NonZeroI16> for NonZeroI128 ​

impl From<NonZeroI16> for NonZeroIsize ​

impl From<NonZeroI32> for i32 ​

impl From<NonZeroI32> for NonZeroI64 ​

impl From<NonZeroI32> for NonZeroI128 ​

impl From<NonZeroI64> for i64 ​

impl From<NonZeroI64> for NonZeroI128 ​

impl From<NonZeroI128> for i128 ​

impl From<NonZeroIsize> for isize ​

impl From<NonZeroU8> for u8 ​

impl From<NonZeroU8> for NonZeroI16 ​

impl From<NonZeroU8> for NonZeroI32 ​

impl From<NonZeroU8> for NonZeroI64 ​

impl From<NonZeroU8> for NonZeroI128 ​

impl From<NonZeroU8> for NonZeroIsize ​

impl From<NonZeroU8> for NonZeroU16 ​

impl From<NonZeroU8> for NonZeroU32 ​

impl From<NonZeroU8> for NonZeroU64 ​

impl From<NonZeroU8> for NonZeroU128 ​

impl From<NonZeroU8> for NonZeroUsize ​

impl From<NonZeroU16> for u16 ​

impl From<NonZeroU16> for NonZeroI32 ​

impl From<NonZeroU16> for NonZeroI64 ​

impl From<NonZeroU16> for NonZeroI128 ​

impl From<NonZeroU16> for NonZeroU32 ​

impl From<NonZeroU16> for NonZeroU64 ​

impl From<NonZeroU16> for NonZeroU128 ​

impl From<NonZeroU16> for NonZeroUsize ​

impl From<NonZeroU32> for u32 ​

impl From<NonZeroU32> for NonZeroI64 ​

impl From<NonZeroU32> for NonZeroI128 ​

impl From<NonZeroU32> for NonZeroU64 ​

impl From<NonZeroU32> for NonZeroU128 ​

impl From<NonZeroU64> for u64 ​

impl From<NonZeroU64> for NonZeroI128 ​

impl From<NonZeroU64> for NonZeroU128 ​

impl From<NonZeroU128> for u128 ​

impl From<NonZeroUsize> for usize ​

impl From<OwnedFd> for File ​

impl From<OwnedFd> for TcpListener ​

impl From<OwnedFd> for TcpStream ​

impl From<OwnedFd> for UdpSocket ​

impl From<OwnedFd> for PidFd ​

Available on Unix only.

impl From<OwnedFd> for UnixDatagram ​

Available on Unix only.

impl From<OwnedFd> for UnixListener ​

Available on Unix only.

impl From<OwnedFd> for UnixStream ​

Available on Unix only.

impl From<OwnedFd> for Stdio ​

Available on Unix only.

impl From<PidFd> for OwnedFd ​

Available on Unix only.

impl From<UnixDatagram> for OwnedFd ​

Available on Unix only.

impl From<UnixListener> for OwnedFd ​

Available on Unix only.

impl From<UnixStream> for OwnedFd ​

Available on Unix only.

impl From<OwnedHandle> for File ​

Available on Windows only.

impl From<OwnedHandle> for Stdio ​

Available on Windows only.

impl From<OwnedSocket> for TcpListener ​

Available on Windows only.

impl From<OwnedSocket> for TcpStream ​

Available on Windows only.

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impl From<OwnedSocket> for UdpSocket ​

Available on Windows only.

impl From<PathBuf> for Box<Path> ​

impl From<PathBuf> for OsString ​

impl From<PathBuf> for Rc<Path> ​

impl From<PathBuf> for Arc<Path> ​

impl From<Child> for OwnedHandle ​

Available on Windows only.

impl From<ChildStderr> for OwnedFd ​

Available on Unix only.

impl From<ChildStderr> for OwnedHandle ​

Available on Windows only.

impl From<ChildStderr> for Stdio ​

impl From<ChildStdin> for OwnedFd ​

Available on Unix only.

impl From<ChildStdin> for OwnedHandle ​

Available on Windows only.

impl From<ChildStdin> for Stdio ​

impl From<ChildStdout> for OwnedFd ​

Available on Unix only.

impl From<ChildStdout> for OwnedHandle ​

Available on Windows only.

impl From<ChildStdout> for Stdio ​

impl From<Alignment> for usize ​

impl From<Alignment> for NonZeroUsize ​

impl From<Rc<str>> for Rc<[u8]> ​

impl From<Simd<f32, 4>> for __m128 ​

impl From<Simd<f32, 8>> for __m256 ​

impl From<Simd<f32, 16>> for __m512 ​

impl From<Simd<f64, 2>> for __m128d ​

impl From<Simd<f64, 4>> for __m256d ​

impl From<Simd<f64, 8>> for __m512d ​

impl From<Simd<i8, 16>> for __m128i ​

impl From<Simd<i8, 32>> for __m256i ​

impl From<Simd<i8, 64>> for __m512i ​

impl From<Simd<i16, 8>> for __m128i ​

impl From<Simd<i16, 16>> for __m256i ​

impl From<Simd<i16, 32>> for __m512i ​

impl From<Simd<i32, 4>> for __m128i ​

impl From<Simd<i32, 8>> for __m256i ​

impl From<Simd<i32, 16>> for __m512i ​

impl From<Simd<i64, 2>> for __m128i ​

impl From<Simd<i64, 4>> for __m256i ​

impl From<Simd<i64, 8>> for __m512i ​

impl From<Simd<isize, 2>> for __m128i ​

impl From<Simd<isize, 4>> for __m256i ​

impl From<Simd<isize, 8>> for __m512i ​

impl From<Simd<u8, 16>> for __m128i ​

impl From<Simd<u8, 32>> for __m256i ​

impl From<Simd<u8, 64>> for __m512i ​

impl From<Simd<u16, 8>> for __m128i ​

impl From<Simd<u16, 16>> for __m256i ​

impl From<Simd<u16, 32>> for __m512i ​

impl From<Simd<u32, 4>> for __m128i ​

impl From<Simd<u32, 8>> for __m256i ​

impl From<Simd<u32, 16>> for __m512i ​

impl From<Simd<u64, 2>> for __m128i ​

impl From<Simd<u64, 4>> for __m256i ​

impl From<Simd<u64, 8>> for __m512i ​

impl From<Simd<usize, 2>> for __m128i ​

impl From<Simd<usize, 4>> for __m256i ​

impl From<Simd<usize, 8>> for __m512i ​

impl From<String> for Box<str, Global> ​

impl From<String> for Box<dyn Error + 'static, Global> ​

impl From<String> for Box<dyn Error + Send + Sync + 'static, Global> ​

impl From<String> for OsString ​

impl From<String> for PathBuf ​

impl From<String> for Rc<str> ​

impl From<String> for Arc<str> ​

impl From<String> for Vec<u8, Global> ​

impl From<RecvError> for RecvTimeoutError ​

impl From<RecvError> for TryRecvError ​

impl From<Arc<str>> for Arc<[u8]> ​

impl From<Vec<NonZeroU8, Global>> for CString ​

impl From<[u8; 4]> for IpAddr ​

impl From<[u8; 4]> for Ipv4Addr ​

impl From<[u8; 16]> for IpAddr ​

impl From<[u8; 16]> for Ipv6Addr ​

impl From<[u16; 8]> for IpAddr ​

impl From<[u16; 8]> for Ipv6Addr ​

impl<'a> From<&'a str> for Cow<'a, str> ​

impl<'a> From<&'a CStr> for Cow<'a, CStr> ​

impl<'a> From<&'a CString> for Cow<'a, CStr> ​

impl<'a> From<&'a OsStr> for Cow<'a, OsStr> ​

impl<'a> From<&'a OsString> for Cow<'a, OsStr> ​

impl<'a> From<&'a Path> for Cow<'a, Path> ​

impl<'a> From<&'a PathBuf> for Cow<'a, Path> ​

impl<'a> From<&'a String> for Cow<'a, str> ​

impl<'a> From<&str> for Box<dyn Error + Send + Sync + 'a, Global> ​

impl<'a> From<Cow<'a, str>> for Box<dyn Error + 'static, Global> ​

impl<'a> From<Cow<'a, str>> for String ​

impl<'a> From<Cow<'a, CStr>> for CString ​

impl<'a> From<Cow<'a, OsStr>> for OsString ​

impl<'a> From<Cow<'a, Path>> for PathBuf ​

impl<'a> From<CString> for Cow<'a, CStr> ​

impl<'a> From<OsString> for Cow<'a, OsStr> ​

impl<'a> From<PathBuf> for Cow<'a, Path> ​

impl<'a> From<String> for Cow<'a, str> ​

impl<'a, 'b> From<Cow<'b, str>> for Box<dyn Error + Send + Sync + 'a, Global> ​

impl<'a, B> From<Cow<'a, B>> for Rc<B> ​

rust
impl<'a, B> From<Cow<'a, B>> for Rc<B>
where
  B: ToOwned + ?Sized,
  Rc<B>: From<&'a B> + From<<B as ToOwned>::Owned>,

impl<'a, B> From<Cow<'a, B>> for Arc<B> ​

rust
impl<'a, B> From<Cow<'a, B>> for Arc<B>
where
  B: ToOwned + ?Sized,
  Arc<B>: From<&'a B> + From<<B as ToOwned>::Owned>,

impl<'a, E> From<E> for Box<dyn Error + 'a, Global> ​

rust
impl<'a, E> From<E> for Box<dyn Error + 'a, Global>
where
  E: Error + 'a,

impl<'a, E> From<E> for Box<dyn Error + Send + Sync + 'a, Global> ​

rust
impl<'a, E> From<E> for Box<dyn Error + Send + Sync + 'a, Global>
where
  E: Error + Send + Sync + 'a,

impl<'a, T> From<&'a Option<T>> for Option<&'a T> ​

impl<'a, T> From<&'a [T]> for Cow<'a, [T]> ​

rust
impl<'a, T> From<&'a [T]> for Cow<'a, [T]>
where
  T: Clone,

impl<'a, T> From<&'a Vec<T, Global>> for Cow<'a, [T]> ​

rust
impl<'a, T> From<&'a Vec<T, Global>> for Cow<'a, [T]>
where
  T: Clone,

impl<'a, T> From<&'a mut Option<T>> for Option<&'a mut T> ​

impl<'a, T> From<Cow<'a, [T]>> for Vec<T, Global> ​

rust
impl<'a, T> From<Cow<'a, [T]>> for Vec<T, Global>
where
  [T]: ToOwned<Owned = Vec<T, Global>>,

impl<'a, T> From<Vec<T, Global>> for Cow<'a, [T]> ​

rust
impl<'a, T> From<Vec<T, Global>> for Cow<'a, [T]>
where
  T: Clone,

impl<'data> From<&'data mut [u8]> for BorrowedBuf<'data> ​

从完全初始化的切片创建一个新的 BorrowedBuf。

impl<'data> From<&'data mut [MaybeUninit<u8>]> for BorrowedBuf<'data> ​

从未初始化的缓冲区创建一个新的 BorrowedBuf。

如果已知缓冲区的一部分已经初始化，则使用 set_init。

impl<A> From<Box<str, A>> for Box<[u8], A> ​

rust
impl<A> From<Box<str, A>> for Box<[u8], A>
where
  A: Allocator,

impl<E> From<E> for Report<E> ​

rust
impl<E> From<E> for Report<E>
where
  E: Error,

impl<I> From<(I, u16)> for SocketAddr ​

rust
impl<I> From<(I, u16)> for SocketAddr
where
  I: Into<IpAddr>,

impl<K, V, const N: usize> From<[(K, V); N]> for HashMap<K, V, RandomState> ​

rust
impl<K, V, const N: usize> From<[(K, V); N]> for HashMap<K, V, RandomState>
where
  K: Eq + Hash,

impl<K, V, const N: usize> From<[(K, V); N]> for BTreeMap<K, V, Global> ​

rust
impl<K, V, const N: usize> From<[(K, V); N]> for BTreeMap<K, V, Global>
where
  K: Ord,

impl<T> From<&[T]> for Box<[T], Global> ​

rust
impl<T> From<&[T]> for Box<[T], Global>
where
  T: Clone,

impl<T> From<&[T]> for Rc<[T]> ​

rust
impl<T> From<&[T]> for Rc<[T]>
where
  T: Clone,

impl<T> From<&[T]> for Arc<[T]> ​

rust
impl<T> From<&[T]> for Arc<[T]>
where
  T: Clone,

impl<T> From<&[T]> for Vec<T, Global> ​

rust
impl<T> From<&[T]> for Vec<T, Global>
where
  T: Clone,

impl<T> From<&mut [T]> for Vec<T, Global> ​

rust
impl<T> From<&mut [T]> for Vec<T, Global>
where
  T: Clone,

impl<T> From<Cow<'_, [T]>> for Box<[T], Global> ​

rust
impl<T> From<Cow<'_, [T]>> for Box<[T], Global>
where
  T: Clone,

impl<T> From<[T; 1]> for (T,) ​

impl<T> From<[T; 2]> for (T, T) ​

impl<T> From<[T; 3]> for (T, T, T) ​

impl<T> From<[T; 4]> for (T, T, T, T) ​

impl<T> From<[T; 5]> for (T, T, T, T, T) ​

impl<T> From<[T; 6]> for (T, T, T, T, T, T) ​

impl<T> From<[T; 7]> for (T, T, T, T, T, T, T) ​

impl<T> From<[T; 8]> for (T, T, T, T, T, T, T, T) ​

impl<T> From<[T; 9]> for (T, T, T, T, T, T, T, T, T) ​

impl<T> From<[T; 10]> for (T, T, T, T, T, T, T, T, T, T) ​

impl<T> From<[T; 11]> for (T, T, T, T, T, T, T, T, T, T, T) ​

impl<T> From<[T; 12]> for (T, T, T, T, T, T, T, T, T, T, T, T) ​

impl<T> From<!> for T ​

稳定性注意事项: 该 impl 尚不存在，但我们 “保留空间” 以在将来添加它。 有关详细信息，请参见 rust-lang/rust#64715。

impl<T> From<*mut T> for AtomicPtr<T> ​

impl<T> From<&T> for NonNull<T> ​

rust
impl<T> From<&T> for NonNull<T>
where
  T: ?Sized,

impl<T> From<&mut T> for NonNull<T> ​

rust
impl<T> From<&mut T> for NonNull<T>
where
  T: ?Sized,

impl<T> From<(T, T)> for [T; 2] ​

impl<T> From<(T, T, T)> for [T; 3] ​

impl<T> From<(T, T, T, T)> for [T; 4] ​

impl<T> From<(T, T, T, T, T)> for [T; 5] ​

impl<T> From<(T, T, T, T, T, T)> for [T; 6] ​

impl<T> From<(T, T, T, T, T, T, T)> for [T; 7] ​

impl<T> From<(T, T, T, T, T, T, T, T)> for [T; 8] ​

impl<T> From<(T, T, T, T, T, T, T, T, T)> for [T; 9] ​

impl<T> From<(T, T, T, T, T, T, T, T, T, T)> for [T; 10] ​

impl<T> From<(T, T, T, T, T, T, T, T, T, T, T)> for [T; 11] ​

impl<T> From<(T, T, T, T, T, T, T, T, T, T, T, T)> for [T; 12] ​

impl<T> From<(T,)> for [T; 1] ​

impl<T> From<Box<T, Global>> for Rc<T> ​

rust
impl<T> From<Box<T, Global>> for Rc<T>
where
  T: ?Sized,

impl<T> From<Box<T, Global>> for Arc<T> ​

rust
impl<T> From<Box<T, Global>> for Arc<T>
where
  T: ?Sized,

impl<T> From<BinaryHeap<T>> for Vec<T, Global> ​

impl<T> From<SendError<T>> for TrySendError<T> ​

impl<T> From<PoisonError<T>> for TryLockError<T> ​

impl<T> From<JoinHandle<T>> for OwnedHandle ​

Available on Windows only.

impl<T> From<Vec<T, Global>> for BinaryHeap<T> ​

rust
impl<T> From<Vec<T, Global>> for BinaryHeap<T>
where
  T: Ord,

impl<T> From<Vec<T, Global>> for Rc<[T]> ​

impl<T> From<Vec<T, Global>> for Arc<[T]> ​

impl<T> From<T> for Option<T> ​

impl<T> From<T> for Poll<T> ​

impl<T> From<T> for Box<T, Global> ​

impl<T> From<T> for Cell<T> ​

impl<T> From<T> for OnceCell<T> ​

impl<T> From<T> for RefCell<T> ​

impl<T> From<T> for SyncUnsafeCell<T> ​

impl<T> From<T> for UnsafeCell<T> ​

impl<T> From<T> for Rc<T> ​

impl<T> From<T> for Arc<T> ​

impl<T> From<T> for Exclusive<T> ​

impl<T> From<T> for Mutex<T> ​

impl<T> From<T> for OnceLock<T> ​

impl<T> From<T> for RwLock<T> ​

impl<T> From<T> for T ​

impl<T, A> From<Box<[T], A>> for Vec<T, A> ​

rust
impl<T, A> From<Box<[T], A>> for Vec<T, A>
where
  A: Allocator,

impl<T, A> From<Box<T, A>> for Pin<Box<T, A>> ​

rust
impl<T, A> From<Box<T, A>> for Pin<Box<T, A>>
where
  A: Allocator + 'static,
  T: ?Sized,

impl<T, A> From<VecDeque<T, A>> for Vec<T, A> ​

rust
impl<T, A> From<VecDeque<T, A>> for Vec<T, A>
where
  A: Allocator,

impl<T, A> From<Vec<T, A>> for Box<[T], A> ​

rust
impl<T, A> From<Vec<T, A>> for Box<[T], A>
where
  A: Allocator,

impl<T, A> From<Vec<T, A>> for VecDeque<T, A> ​

rust
impl<T, A> From<Vec<T, A>> for VecDeque<T, A>
where
  A: Allocator,

impl<T, const LANES: usize> From<Mask<T, LANES>> for [bool; LANES] ​

rust
impl<T, const LANES: usize> From<Mask<T, LANES>> for [bool; LANES]
where
  T: MaskElement,
  LaneCount<LANES>: SupportedLaneCount,

impl<T, const LANES: usize> From<Mask<T, LANES>> for Simd<T, LANES> ​

rust
impl<T, const LANES: usize> From<Mask<T, LANES>> for Simd<T, LANES>
where
  T: MaskElement,
  LaneCount<LANES>: SupportedLaneCount,

impl<T, const LANES: usize> From<[bool; LANES]> for Mask<T, LANES> ​

rust
impl<T, const LANES: usize> From<[bool; LANES]> for Mask<T, LANES>
where
  T: MaskElement,
  LaneCount<LANES>: SupportedLaneCount,

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

impl<T, const N: usize> From<[T; N]> for HashSet<T, RandomState> ​

rust
impl<T, const N: usize> From<[T; N]> for HashSet<T, RandomState>
where
  T: Eq + Hash,

impl<T, const N: usize> From<[T; N]> for BTreeSet<T, Global> ​

rust
impl<T, const N: usize> From<[T; N]> for BTreeSet<T, Global>
where
  T: Ord,

impl<T, const N: usize> From<[T; N]> for BinaryHeap<T> ​

rust
impl<T, const N: usize> From<[T; N]> for BinaryHeap<T>
where
  T: Ord,

impl<T, const N: usize> From<[T; N]> for LinkedList<T, Global> ​

impl<T, const N: usize> From<[T; N]> for VecDeque<T, Global> ​

impl<T, const N: usize> From<[T; N]> for Simd<T, N> ​

rust
impl<T, const N: usize> From<[T; N]> for Simd<T, N>
where
  LaneCount<N>: SupportedLaneCount,
  T: SimdElement,

impl<T, const N: usize> From<[T; N]> for Vec<T, Global> ​

impl<T, const N: usize> From<Simd<T, N>> for [T; N] ​

rust
impl<T, const N: usize> From<Simd<T, N>> for [T; N]
where
  LaneCount<N>: SupportedLaneCount,
  T: SimdElement,

impl<T: ?Sized + AsRef<OsStr>> From<&T> for OsString ​

impl<T: ?Sized + AsRef<OsStr>> From<&T> for PathBuf ​

impl<W> From<IntoInnerError<W>> for Error ​

impl<W> From<Arc<W>> for RawWaker ​

rust
impl<W> From<Arc<W>> for RawWaker
where
  W: Wake + Send + Sync + 'static,

impl<W> From<Arc<W>> for Waker ​

rust
impl<W> From<Arc<W>> for Waker
where
  W: Wake + Send + Sync + 'static,

impl<const LANES: usize> From<Mask<i8, LANES>> for Mask<i16, LANES> ​

rust
impl<const LANES: usize> From<Mask<i8, LANES>> for Mask<i16, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i8, LANES>> for Mask<i32, LANES> ​

rust
impl<const LANES: usize> From<Mask<i8, LANES>> for Mask<i32, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i8, LANES>> for Mask<i64, LANES> ​

rust
impl<const LANES: usize> From<Mask<i8, LANES>> for Mask<i64, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i8, LANES>> for Mask<isize, LANES> ​

rust
impl<const LANES: usize> From<Mask<i8, LANES>> for Mask<isize, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i16, LANES>> for Mask<i8, LANES> ​

rust
impl<const LANES: usize> From<Mask<i16, LANES>> for Mask<i8, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i16, LANES>> for Mask<i32, LANES> ​

rust
impl<const LANES: usize> From<Mask<i16, LANES>> for Mask<i32, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i16, LANES>> for Mask<i64, LANES> ​

rust
impl<const LANES: usize> From<Mask<i16, LANES>> for Mask<i64, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i16, LANES>> for Mask<isize, LANES> ​

rust
impl<const LANES: usize> From<Mask<i16, LANES>> for Mask<isize, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i32, LANES>> for Mask<i8, LANES> ​

rust
impl<const LANES: usize> From<Mask<i32, LANES>> for Mask<i8, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i32, LANES>> for Mask<i16, LANES> ​

rust
impl<const LANES: usize> From<Mask<i32, LANES>> for Mask<i16, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i32, LANES>> for Mask<i64, LANES> ​

rust
impl<const LANES: usize> From<Mask<i32, LANES>> for Mask<i64, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i32, LANES>> for Mask<isize, LANES> ​

rust
impl<const LANES: usize> From<Mask<i32, LANES>> for Mask<isize, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i64, LANES>> for Mask<i8, LANES> ​

rust
impl<const LANES: usize> From<Mask<i64, LANES>> for Mask<i8, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i64, LANES>> for Mask<i16, LANES> ​

rust
impl<const LANES: usize> From<Mask<i64, LANES>> for Mask<i16, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i64, LANES>> for Mask<i32, LANES> ​

rust
impl<const LANES: usize> From<Mask<i64, LANES>> for Mask<i32, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<i64, LANES>> for Mask<isize, LANES> ​

rust
impl<const LANES: usize> From<Mask<i64, LANES>> for Mask<isize, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<isize, LANES>> for Mask<i8, LANES> ​

rust
impl<const LANES: usize> From<Mask<isize, LANES>> for Mask<i8, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<isize, LANES>> for Mask<i16, LANES> ​

rust
impl<const LANES: usize> From<Mask<isize, LANES>> for Mask<i16, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<isize, LANES>> for Mask<i32, LANES> ​

rust
impl<const LANES: usize> From<Mask<isize, LANES>> for Mask<i32, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl<const LANES: usize> From<Mask<isize, LANES>> for Mask<i64, LANES> ​

rust
impl<const LANES: usize> From<Mask<isize, LANES>> for Mask<i64, LANES>
where
  LaneCount<LANES>: SupportedLaneCount,

impl From<Ident> for TokenTree ​

impl From<Literal> for TokenTree ​

impl From<Punct> for TokenTree ​

impl From<TokenTree> for TokenStream ​

impl From<Group> for TokenTree ​

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