nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2025-02-04 02:54:00 +00:00
Code Issues Packages Projects Releases Wiki Activity

Document pattern ranges a little more

Browse Source 
Patches for further documentation of them welcome, but this
is good enough for now.

Closes #1107
This commit is contained in:
Tim Chevalier 2012-12-06 17:29:36 -08:00
parent 31a4f40329
commit b4501f4c64
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
doc/rust.md
View File

@ -2244,8 +2244,9 @@ The compiler interprets a variable pattern `x` as a binding _only_ if there is n
A convention you can use to avoid conflicts is simply to name variants with upper-case letters,
and local variables with lower-case letters.
Multiple match patterns may be joined with the `|` operator. A
range of values may be specified with `..`. For example:
Multiple match patterns may be joined with the `|` operator.
A range of values may be specified with `..`.
For example:
~~~~
# let x = 2;
@ -2257,6 +2258,10 @@ let message = match x {
};
~~~~
Range patterns only work on scalar types
(like integers and characters; not like vectors and structs, which have sub-components).
A range pattern may not be a sub-range of another range pattern inside the same `match`.
Finally, match patterns can accept *pattern guards* to further refine the
criteria for matching a case. Pattern guards appear after the pattern and
consist of a bool-typed expression following the `if` keyword. A pattern