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Docs: Better explanation of return values for min, max functions 

Explain that a None is returned if the iterator is empty.
This commit is contained in:
Mikhail Pak 2017-02-19 11:01:02 +01:00
parent 306035c217
commit eee6752b97
1 changed files with 22 additions and 6 deletions
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28
src/libcore/iter/iterator.rs
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@ -1616,7 +1616,9 @@ pub trait Iterator {
/// Returns the maximum element of an iterator.
///
/// If several elements are equally maximum, the last element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
@ -1624,8 +1626,10 @@ pub trait Iterator {
///
/// ```
/// let a = [1, 2, 3];
/// let b: Vec<u32> = Vec::new();
///
/// assert_eq!(a.iter().max(), Some(&3));
/// assert_eq!(b.iter().max(), None);
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
@ -1642,7 +1646,9 @@ pub trait Iterator {
/// Returns the minimum element of an iterator.
///
/// If several elements are equally minimum, the first element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
@ -1650,8 +1656,10 @@ pub trait Iterator {
///
/// ```
/// let a = [1, 2, 3];
/// let b: Vec<u32> = Vec::new();
///
/// assert_eq!(a.iter().min(), Some(&1));
/// assert_eq!(b.iter().min(), None);
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
@ -1669,7 +1677,9 @@ pub trait Iterator {
/// specified function.
///
/// If several elements are equally maximum, the last element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
@ -1694,7 +1704,9 @@ pub trait Iterator {
/// specified comparison function.
///
/// If several elements are equally maximum, the last element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
@ -1719,7 +1731,9 @@ pub trait Iterator {
/// specified function.
///
/// If several elements are equally minimum, the first element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
@ -1743,7 +1757,9 @@ pub trait Iterator {
/// specified comparison function.
///
/// If several elements are equally minimum, the first element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///