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Trait std::fmt::Display ​

空格式的格式 trait，{}。

rust
pub trait Display {
    // Required method
    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}

为一个类型实现这个 trait 将自动为该类型实现 ToString trait，允许使用 .to_string() 方法。

Display 与 Debug 类似，但 Display 是面向用户的输出，因此无法导出。

Required Methods ​

fmt ​

使用给定的格式化程序格式化该值。

rust
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

参数：

  • f：一个Formatter格式化读写对象对象，可以格式化上下文 + 输出目标

返回值：返回一个Result，若格式化错误则返回Err

rust
use std::fmt;

struct Point {
    x: i32,
    y: i32,
}

impl fmt::Display for Point {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "({}, {})", self.x, self.y)
    }
}

fn main() {
    let origin = Point { x: 0, y: 0 };
    println!("{}", origin);  // (0, 0)
}

Implementors ​

mpl Display for AsciiChar ​

impl Display for Infallible ​

impl Display for VarError ​

impl Display for ErrorKind ​

impl Display for IpAddr ​

impl Display for SocketAddr ​

impl Display for RecvTimeoutError ​

impl Display for TryRecvError ​

impl Display for bool ​

impl Display for char ​

impl Display for f32 ​

impl Display for f64 ​

impl Display for i8 ​

impl Display for i16 ​

impl Display for i32 ​

impl Display for i64 ​

impl Display for i128 ​

impl Display for isize ​

impl Display for ! ​

impl Display for str ​

impl Display for u8 ​

impl Display for u16 ​

impl Display for u32 ​

impl Display for u64 ​

impl Display for u128 ​

impl Display for usize ​

impl Display for FromBytesUntilNulError ​

impl Display for AllocError ​

impl Display for LayoutError ​

impl Display for TryFromSliceError ​

impl Display for std::ascii::EscapeDefault ​

impl Display for Backtrace ​

impl Display for BorrowError ​

impl Display for BorrowMutError ​

impl Display for CharTryFromError ​

impl Display for DecodeUtf16Error ​

impl Display for std::char::EscapeDebug ​

impl Display for std::char::EscapeDefault ​

impl Display for std::char::EscapeUnicode ​

impl Display for ParseCharError ​

impl Display for ToLowercase ​

impl Display for ToUppercase ​

impl Display for TryFromCharError ​

impl Display for TryReserveError ​

impl Display for JoinPathsError ​

impl Display for FromBytesWithNulError ​

impl Display for FromVecWithNulError ​

impl Display for IntoStringError ​

impl Display for NulError ​

impl Display for std::io::Error ​

impl Display for WriterPanicked ​

impl Display for AddrParseError ​

impl Display for Ipv4Addr ​

impl Display for Ipv6Addr ​

编写一个符合 RFC 5952 描述的规范样式的 Ivv6Addr。

impl Display for SocketAddrV4 ​

impl Display for SocketAddrV6 ​

impl Display for NonZeroI8 ​

impl Display for NonZeroI16 ​

impl Display for NonZeroI32 ​

impl Display for NonZeroI64 ​

impl Display for NonZeroI128 ​

impl Display for NonZeroIsize ​

impl Display for NonZeroU8 ​

impl Display for NonZeroU16 ​

impl Display for NonZeroU32 ​

impl Display for NonZeroU64 ​

impl Display for NonZeroU128 ​

impl Display for NonZeroUsize ​

impl Display for ParseFloatError ​

impl Display for ParseIntError ​

impl Display for TryFromIntError ​

impl Display for InvalidHandleError ​

Available on Windows only.

impl Display for NullHandleError ​

Available on Windows only.

impl Display for Location<'_> ​

impl Display for PanicInfo<'_> ​

impl Display for Display<'_> ​

impl Display for StripPrefixError ​

impl Display for ExitStatus ​

impl Display for ExitStatusError ​

impl Display for ParseBoolError ​

impl Display for Utf8Error ​

impl Display for FromUtf8Error ​

impl Display for FromUtf16Error ​

impl Display for String ​

impl Display for RecvError ​

impl Display for AccessError ​

impl Display for SystemTimeError ​

impl Display for TryFromFloatSecsError ​

impl Display for Arguments<'_> ​

impl Display for std::fmt::Error ​

impl<'a> Display for EscapeAscii<'a> ​

impl<'a> Display for std::str::EscapeDebug<'a> ​

impl<'a> Display for std::str::EscapeDefault<'a> ​

impl<'a> Display for std::str::EscapeUnicode<'a> ​

impl<'a, K, V, A> Display for std::collections::btree_map::OccupiedError<'a, K, V, A> ​

rust
impl<'a, K, V, A> Display for std::collections::btree_map::OccupiedError<'a, K, V, A>
where
  K: Debug + Ord,
  V: Debug,
  A: Allocator + Clone,

impl<'a, K: Debug, V: Debug> Display for std::collections::hash_map::OccupiedError<'a, K, V> ​

impl<B> Display for Cow<'_, B> ​

rust
impl<B> Display for Cow<'_, B>
where
  B: Display + ToOwned + ?Sized,
  <B as ToOwned>::Owned: Display,

impl<E> Display for Report<E> ​

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

impl<P> Display for Pin<P> ​

rust
impl<P> Display for Pin<P>
where
  P: Display,

impl<T> Display for TryLockError<T> ​

impl<T> Display for TrySendError<T> ​

impl<T> Display for &T ​

rust
impl<T> Display for &T
where
  T: Display + ?Sized,

impl<T> Display for &mut T ​

rust
impl<T> Display for &mut T
where
  T: Display + ?Sized,

impl<T> Display for ThinBox<T> ​

rust
impl<T> Display for ThinBox<T>
where
  T: Display + ?Sized,

impl<T> Display for Ref<'_, T> ​

rust
impl<T> Display for Ref<'_, T>
where
  T: Display + ?Sized,

impl<T> Display for RefMut<'_, T> ​

rust
impl<T> Display for RefMut<'_, T>
where
  T: Display + ?Sized,

impl<T> Display for Saturating<T> ​

rust
impl<T> Display for Saturating<T>
where
  T: Display,

impl<T> Display for Wrapping<T> ​

rust
impl<T> Display for Wrapping<T>
where
  T: Display,

impl<T> Display for Rc<T> ​

rust
impl<T> Display for Rc<T>
where
  T: Display + ?Sized,

impl<T> Display for SendError<T> ​

impl<T> Display for Arc<T> ​

rust
impl<T> Display for Arc<T>
where
  T: Display + ?Sized,

impl<T> Display for PoisonError<T> ​

impl<T, A> Display for Box<T, A> ​

rust
impl<T, A> Display for Box<T, A>
where
  T: Display + ?Sized,
  A: Allocator,

impl<T: ?Sized + Display> Display for MutexGuard<'_, T> ​

impl<T: ?Sized + Display> Display for RwLockReadGuard<'_, T> ​

impl<T: ?Sized + Display> Display for RwLockWriteGuard<'_, T> ​

impl<W> Display for IntoInnerError<W> ​

impl<const N: usize> Display for GetManyMutError<N> ​

impl Display for TokenStream ​

impl Display for Group ​

impl Display for Literal ​

impl Display for Ident ​

impl Display for LexError ​

impl Display for Punct ​

impl Display for ExpandError ​

impl Display for TokenTree ​

impl Display for TestExecTime ​

impl Display for TestName ​

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