!self.is_ok()
}
- /// Returns `true` if the result is an [`Ok`] value containing the given value.
- ///
- /// # Examples
- ///
- /// ```
- /// #![feature(option_result_contains)]
- ///
- /// let x: Result<u32, &str> = Ok(2);
- /// assert_eq!(x.contains(&2), true);
- ///
- /// let x: Result<u32, &str> = Ok(3);
- /// assert_eq!(x.contains(&2), false);
- ///
- /// let x: Result<u32, &str> = Err("Some error message");
- /// assert_eq!(x.contains(&2), false);
- /// ```
- #[must_use]
- #[inline]
- #[unstable(feature = "option_result_contains", issue = "62358")]
- pub fn contains<U>(&self, x: &U) -> bool
- where
- U: PartialEq<T>,
- {
- match self {
- Ok(y) => x == y,
- Err(_) => false,
- }
- }
-
- /// Returns `true` if the result is an [`Err`] value containing the given value.
- ///
- /// # Examples
- ///
- /// ```
- /// #![feature(result_contains_err)]
- ///
- /// let x: Result<u32, &str> = Ok(2);
- /// assert_eq!(x.contains_err(&"Some error message"), false);
- ///
- /// let x: Result<u32, &str> = Err("Some error message");
- /// assert_eq!(x.contains_err(&"Some error message"), true);
- ///
- /// let x: Result<u32, &str> = Err("Some other error message");
- /// assert_eq!(x.contains_err(&"Some error message"), false);
- /// ```
- #[must_use]
- #[inline]
- #[unstable(feature = "result_contains_err", issue = "62358")]
- pub fn contains_err<F>(&self, f: &F) -> bool
- where
- F: PartialEq<E>,
- {
- match self {
- Ok(_) => false,
- Err(e) => f == e,
- }
- }
-
/////////////////////////////////////////////////////////////////////////
// Adapter for each variant
/////////////////////////////////////////////////////////////////////////
}
}
+ /// Returns the contained [`Err`] value, consuming the `self` value.
+ ///
+ /// # Panics
+ ///
+ /// Panics if the value is an [`Ok`], with a panic message including the
+ /// passed message, and the content of the [`Ok`].
+ ///
+ ///
+ /// # Examples
+ ///
+ /// Basic usage:
+ ///
+ /// ```should_panic
+ /// let x: Result<u32, &str> = Ok(10);
+ /// x.expect_err("Testing expect_err"); // panics with `Testing expect_err: 10`
+ /// ```
+ #[inline]
+ #[track_caller]
+ #[stable(feature = "result_expect_err", since = "1.17.0")]
+ pub fn expect_err(self, msg: &str) -> E
+ where
+ T: fmt::Debug,
+ {
+ match self {
+ Ok(t) => unwrap_failed(msg, &t),
+ Err(e) => e,
+ }
+ }
+
+ /// Returns the contained [`Err`] value, consuming the `self` value.
+ ///
+ /// # Panics
+ ///
+ /// Panics if the value is an [`Ok`], with a custom panic message provided
+ /// by the [`Ok`]'s value.
+ ///
+ /// # Examples
+ ///
+ /// ```should_panic
+ /// let x: Result<u32, &str> = Ok(2);
+ /// x.unwrap_err(); // panics with `2`
+ /// ```
+ ///
+ /// ```
+ /// let x: Result<u32, &str> = Err("emergency failure");
+ /// assert_eq!(x.unwrap_err(), "emergency failure");
+ /// ```
+ #[inline]
+ #[track_caller]
+ #[stable(feature = "rust1", since = "1.0.0")]
+ pub fn unwrap_err(self) -> E
+ where
+ T: fmt::Debug,
+ {
+ match self {
+ Ok(t) => unwrap_failed("called `Result::unwrap_err()` on an `Ok` value", &t),
+ Err(e) => e,
+ }
+ }
+
+ /// Returns the contained [`Ok`] value, but never panics.
+ ///
+ /// Unlike [`unwrap`], this method is known to never panic on the
+ /// result types it is implemented for. Therefore, it can be used
+ /// instead of `unwrap` as a maintainability safeguard that will fail
+ /// to compile if the error type of the `Result` is later changed
+ /// to an error that can actually occur.
+ ///
+ /// [`unwrap`]: Result::unwrap
+ ///
+ /// # Examples
+ ///
+ /// Basic usage:
+ ///
+ /// ```
+ /// # #![feature(never_type)]
+ /// # #![feature(unwrap_infallible)]
+ ///
+ /// fn only_good_news() -> Result<String, !> {
+ /// Ok("this is fine".into())
+ /// }
+ ///
+ /// let s: String = only_good_news().into_ok();
+ /// println!("{}", s);
+ /// ```
+ #[unstable(feature = "unwrap_infallible", reason = "newly added", issue = "61695")]
+ #[inline]
+ pub fn into_ok(self) -> T
+ where
+ E: Into<!>,
+ {
+ match self {
+ Ok(x) => x,
+ Err(e) => e.into(),
+ }
+ }
+
+ /// Returns the contained [`Err`] value, but never panics.
+ ///
+ /// Unlike [`unwrap_err`], this method is known to never panic on the
+ /// result types it is implemented for. Therefore, it can be used
+ /// instead of `unwrap_err` as a maintainability safeguard that will fail
+ /// to compile if the ok type of the `Result` is later changed
+ /// to a type that can actually occur.
+ ///
+ /// [`unwrap_err`]: Result::unwrap_err
+ ///
+ /// # Examples
+ ///
+ /// Basic usage:
+ ///
+ /// ```
+ /// # #![feature(never_type)]
+ /// # #![feature(unwrap_infallible)]
+ ///
+ /// fn only_bad_news() -> Result<!, String> {
+ /// Err("Oops, it failed".into())
+ /// }
+ ///
+ /// let error: String = only_bad_news().into_err();
+ /// println!("{}", error);
+ /// ```
+ #[unstable(feature = "unwrap_infallible", reason = "newly added", issue = "61695")]
+ #[inline]
+ pub fn into_err(self) -> E
+ where
+ T: Into<!>,
+ {
+ match self {
+ Ok(x) => x.into(),
+ Err(e) => e,
+ }
+ }
+
////////////////////////////////////////////////////////////////////////
// Boolean operations on the values, eager and lazy
/////////////////////////////////////////////////////////////////////////
Err(e) => e,
}
}
-}
-impl<T: Copy, E> Result<&T, E> {
- /// Maps a `Result<&T, E>` to a `Result<T, E>` by copying the contents of the
- /// `Ok` part.
+ /////////////////////////////////////////////////////////////////////////
+ // Misc or niche
+ /////////////////////////////////////////////////////////////////////////
+
+ /// Returns `true` if the result is an [`Ok`] value containing the given value.
///
/// # Examples
///
/// ```
- /// #![feature(result_copied)]
- /// let val = 12;
- /// let x: Result<&i32, i32> = Ok(&val);
- /// assert_eq!(x, Ok(&12));
- /// let copied = x.copied();
- /// assert_eq!(copied, Ok(12));
+ /// #![feature(option_result_contains)]
+ ///
+ /// let x: Result<u32, &str> = Ok(2);
+ /// assert_eq!(x.contains(&2), true);
+ ///
+ /// let x: Result<u32, &str> = Ok(3);
+ /// assert_eq!(x.contains(&2), false);
+ ///
+ /// let x: Result<u32, &str> = Err("Some error message");
+ /// assert_eq!(x.contains(&2), false);
/// ```
- #[unstable(feature = "result_copied", reason = "newly added", issue = "63168")]
- pub fn copied(self) -> Result<T, E> {
- self.map(|&t| t)
+ #[must_use]
+ #[inline]
+ #[unstable(feature = "option_result_contains", issue = "62358")]
+ pub fn contains<U>(&self, x: &U) -> bool
+ where
+ U: PartialEq<T>,
+ {
+ match self {
+ Ok(y) => x == y,
+ Err(_) => false,
+ }
}
-}
-impl<T: Copy, E> Result<&mut T, E> {
- /// Maps a `Result<&mut T, E>` to a `Result<T, E>` by copying the contents of the
- /// `Ok` part.
+ /// Returns `true` if the result is an [`Err`] value containing the given value.
///
/// # Examples
///
/// ```
- /// #![feature(result_copied)]
- /// let mut val = 12;
- /// let x: Result<&mut i32, i32> = Ok(&mut val);
- /// assert_eq!(x, Ok(&mut 12));
- /// let copied = x.copied();
- /// assert_eq!(copied, Ok(12));
+ /// #![feature(result_contains_err)]
+ ///
+ /// let x: Result<u32, &str> = Ok(2);
+ /// assert_eq!(x.contains_err(&"Some error message"), false);
+ ///
+ /// let x: Result<u32, &str> = Err("Some error message");
+ /// assert_eq!(x.contains_err(&"Some error message"), true);
+ ///
+ /// let x: Result<u32, &str> = Err("Some other error message");
+ /// assert_eq!(x.contains_err(&"Some error message"), false);
/// ```
- #[unstable(feature = "result_copied", reason = "newly added", issue = "63168")]
- pub fn copied(self) -> Result<T, E> {
- self.map(|&mut t| t)
+ #[must_use]
+ #[inline]
+ #[unstable(feature = "result_contains_err", issue = "62358")]
+ pub fn contains_err<F>(&self, f: &F) -> bool
+ where
+ F: PartialEq<E>,
+ {
+ match self {
+ Ok(_) => false,
+ Err(e) => f == e,
+ }
}
}
-impl<T: Clone, E> Result<&T, E> {
- /// Maps a `Result<&T, E>` to a `Result<T, E>` by cloning the contents of the
+impl<T, E> Result<&T, E> {
+ /// Maps a `Result<&T, E>` to a `Result<T, E>` by copying the contents of the
/// `Ok` part.
///
/// # Examples
///
/// ```
- /// #![feature(result_cloned)]
/// let val = 12;
/// let x: Result<&i32, i32> = Ok(&val);
/// assert_eq!(x, Ok(&12));
- /// let cloned = x.cloned();
- /// assert_eq!(cloned, Ok(12));
+ /// let copied = x.copied();
+ /// assert_eq!(copied, Ok(12));
/// ```
- #[unstable(feature = "result_cloned", reason = "newly added", issue = "63168")]
- pub fn cloned(self) -> Result<T, E> {
- self.map(|t| t.clone())
+ #[inline]
+ #[stable(feature = "result_copied", since = "1.59.0")]
+ pub fn copied(self) -> Result<T, E>
+ where
+ T: Copy,
+ {
+ self.map(|&t| t)
}
-}
-impl<T: Clone, E> Result<&mut T, E> {
- /// Maps a `Result<&mut T, E>` to a `Result<T, E>` by cloning the contents of the
+ /// Maps a `Result<&T, E>` to a `Result<T, E>` by cloning the contents of the
/// `Ok` part.
///
/// # Examples
///
/// ```
- /// #![feature(result_cloned)]
- /// let mut val = 12;
- /// let x: Result<&mut i32, i32> = Ok(&mut val);
- /// assert_eq!(x, Ok(&mut 12));
+ /// let val = 12;
+ /// let x: Result<&i32, i32> = Ok(&val);
+ /// assert_eq!(x, Ok(&12));
/// let cloned = x.cloned();
/// assert_eq!(cloned, Ok(12));
/// ```
- #[unstable(feature = "result_cloned", reason = "newly added", issue = "63168")]
- pub fn cloned(self) -> Result<T, E> {
- self.map(|t| t.clone())
- }
-}
-
-impl<T: fmt::Debug, E> Result<T, E> {
- /// Returns the contained [`Err`] value, consuming the `self` value.
- ///
- /// # Panics
- ///
- /// Panics if the value is an [`Ok`], with a panic message including the
- /// passed message, and the content of the [`Ok`].
- ///
- ///
- /// # Examples
- ///
- /// Basic usage:
- ///
- /// ```should_panic
- /// let x: Result<u32, &str> = Ok(10);
- /// x.expect_err("Testing expect_err"); // panics with `Testing expect_err: 10`
- /// ```
- #[inline]
- #[track_caller]
- #[stable(feature = "result_expect_err", since = "1.17.0")]
- pub fn expect_err(self, msg: &str) -> E {
- match self {
- Ok(t) => unwrap_failed(msg, &t),
- Err(e) => e,
- }
- }
-
- /// Returns the contained [`Err`] value, consuming the `self` value.
- ///
- /// # Panics
- ///
- /// Panics if the value is an [`Ok`], with a custom panic message provided
- /// by the [`Ok`]'s value.
- ///
- /// # Examples
- ///
- /// ```should_panic
- /// let x: Result<u32, &str> = Ok(2);
- /// x.unwrap_err(); // panics with `2`
- /// ```
- ///
- /// ```
- /// let x: Result<u32, &str> = Err("emergency failure");
- /// assert_eq!(x.unwrap_err(), "emergency failure");
- /// ```
#[inline]
- #[track_caller]
- #[stable(feature = "rust1", since = "1.0.0")]
- pub fn unwrap_err(self) -> E {
- match self {
- Ok(t) => unwrap_failed("called `Result::unwrap_err()` on an `Ok` value", &t),
- Err(e) => e,
- }
+ #[stable(feature = "result_cloned", since = "1.59.0")]
+ pub fn cloned(self) -> Result<T, E>
+ where
+ T: Clone,
+ {
+ self.map(|t| t.clone())
}
}
-#[unstable(feature = "unwrap_infallible", reason = "newly added", issue = "61695")]
-impl<T, E: Into<!>> Result<T, E> {
- /// Returns the contained [`Ok`] value, but never panics.
- ///
- /// Unlike [`unwrap`], this method is known to never panic on the
- /// result types it is implemented for. Therefore, it can be used
- /// instead of `unwrap` as a maintainability safeguard that will fail
- /// to compile if the error type of the `Result` is later changed
- /// to an error that can actually occur.
- ///
- /// [`unwrap`]: Result::unwrap
+impl<T, E> Result<&mut T, E> {
+ /// Maps a `Result<&mut T, E>` to a `Result<T, E>` by copying the contents of the
+ /// `Ok` part.
///
/// # Examples
///
- /// Basic usage:
- ///
/// ```
- /// # #![feature(never_type)]
- /// # #![feature(unwrap_infallible)]
- ///
- /// fn only_good_news() -> Result<String, !> {
- /// Ok("this is fine".into())
- /// }
- ///
- /// let s: String = only_good_news().into_ok();
- /// println!("{}", s);
+ /// let mut val = 12;
+ /// let x: Result<&mut i32, i32> = Ok(&mut val);
+ /// assert_eq!(x, Ok(&mut 12));
+ /// let copied = x.copied();
+ /// assert_eq!(copied, Ok(12));
/// ```
#[inline]
- pub fn into_ok(self) -> T {
- match self {
- Ok(x) => x,
- Err(e) => e.into(),
- }
+ #[stable(feature = "result_copied", since = "1.59.0")]
+ pub fn copied(self) -> Result<T, E>
+ where
+ T: Copy,
+ {
+ self.map(|&mut t| t)
}
-}
-#[unstable(feature = "unwrap_infallible", reason = "newly added", issue = "61695")]
-impl<T: Into<!>, E> Result<T, E> {
- /// Returns the contained [`Err`] value, but never panics.
- ///
- /// Unlike [`unwrap_err`], this method is known to never panic on the
- /// result types it is implemented for. Therefore, it can be used
- /// instead of `unwrap_err` as a maintainability safeguard that will fail
- /// to compile if the ok type of the `Result` is later changed
- /// to a type that can actually occur.
- ///
- /// [`unwrap_err`]: Result::unwrap_err
+ /// Maps a `Result<&mut T, E>` to a `Result<T, E>` by cloning the contents of the
+ /// `Ok` part.
///
/// # Examples
///
- /// Basic usage:
- ///
/// ```
- /// # #![feature(never_type)]
- /// # #![feature(unwrap_infallible)]
- ///
- /// fn only_bad_news() -> Result<!, String> {
- /// Err("Oops, it failed".into())
- /// }
- ///
- /// let error: String = only_bad_news().into_err();
- /// println!("{}", error);
+ /// let mut val = 12;
+ /// let x: Result<&mut i32, i32> = Ok(&mut val);
+ /// assert_eq!(x, Ok(&mut 12));
+ /// let cloned = x.cloned();
+ /// assert_eq!(cloned, Ok(12));
/// ```
#[inline]
- pub fn into_err(self) -> E {
- match self {
- Ok(x) => x.into(),
- Err(e) => e,
- }
+ #[stable(feature = "result_cloned", since = "1.59.0")]
+ pub fn cloned(self) -> Result<T, E>
+ where
+ T: Clone,
+ {
+ self.map(|t| t.clone())
}
}
projects / rust.git / blobdiff