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Indicate why str::{get,get_mut} examples return None.

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This commit is contained in:
Corey Farwell 2017-08-04 08:21:28 -04:00
parent c523b3f954
commit ea6a657175
1 changed files with 15 additions and 5 deletions
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20
src/liballoc/str.rs
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@ -328,11 +328,16 @@ impl str {
/// # Examples
///
/// ```
/// let v = "🗻∈🌏";
/// assert_eq!(Some("🗻"), v.get(0..4));
/// assert!(v.get(1..).is_none());
/// assert!(v.get(..8).is_none());
/// assert!(v.get(..42).is_none());
/// let mut v = String::from("🗻∈🌏");
///
/// assert_eq!(Some("🗻"), v.get(0..4);
///
/// // indices not on UTF-8 sequence boundaries
/// assert!(v.get_mut(1..).is_none());
/// assert!(v.get_mut(..8).is_none());
///
/// // out of bounds
/// assert!(v.get_mut(..42).is_none());
/// ```
#[stable(feature = "str_checked_slicing", since = "1.20.0")]
#[inline]
@ -351,9 +356,14 @@ impl str {
///
/// ```
/// let mut v = String::from("🗻∈🌏");
///
/// assert_eq!(Some("🗻"), v.get_mut(0..4).map(|v| &*v));
///
/// // indices not on UTF-8 sequence boundaries
/// assert!(v.get_mut(1..).is_none());
/// assert!(v.get_mut(..8).is_none());
///
/// // out of bounds
/// assert!(v.get_mut(..42).is_none());
/// ```
#[stable(feature = "str_checked_slicing", since = "1.20.0")]