Skip to content

Slight modification to the as_ref example of std::option::Option #48509

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Mar 6, 2018
Merged

Slight modification to the as_ref example of std::option::Option #48509

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
bbd64b2
Slight modification to the as_ref example of std::option::Option
Phlosioneer Feb 24, 2018
e8904f9
Change the example string to something arbitrary
Phlosioneer Feb 25, 2018
b7b3498
Fix doctest failure
Phlosioneer Feb 27, 2018
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 4 additions & 4 deletions src/libcore/option.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -233,11 +233,11 @@ impl<T> Option<T> {
/// [`usize`]: ../../std/primitive.usize.html
///
/// ```
/// let num_as_str: Option<String> = Some("10".to_string());
/// let text: Option<String> = Some("Hello, world!".to_string());
/// // First, cast `Option<String>` to `Option<&String>` with `as_ref`,
/// // then consume *that* with `map`, leaving `num_as_str` on the stack.
/// let num_as_int: Option<usize> = num_as_str.as_ref().map(|n| n.len());
/// println!("still can print num_as_str: {:?}", num_as_str);
/// // then consume *that* with `map`, leaving `text` on the stack.
/// let text_length: Option<usize> = text.as_ref().map(|s| s.len());
/// println!("still can print text: {:?}", text);
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
Expand Down