nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2024-11-22 14:55:26 +00:00
Code Issues Packages Projects Releases Wiki Activity

doc: Fix tutorial for struct deref

Browse Source
This commit is contained in:
Brian Anderson 2014-01-04 12:13:31 -08:00
parent 2d8fbba57d
commit ec69dea6f7
1 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
doc/tutorial.md
View File

@ -793,15 +793,6 @@ synonym for an existing type but is rather its own distinct type.
struct GizmoId(int);
~~~~
For convenience, you can extract the contents of such a struct with the
dereference (`*`) unary operator:
~~~~
# struct GizmoId(int);
let my_gizmo_id: GizmoId = GizmoId(10);
let id_int: int = *my_gizmo_id;
~~~~
Types like this can be useful to differentiate between data that have
the same underlying type but must be used in different ways.
@ -811,7 +802,16 @@ struct Centimeters(int);
~~~~
The above definitions allow for a simple way for programs to avoid
confusing numbers that correspond to different units.
confusing numbers that correspond to different units. Their integer
values can be extracted with pattern matching:
~~~
# struct Inches(int);
let length_with_unit = Inches(10);
let Inches(integer_length) = length_with_unit;
println!("length is {} inches", integer_length);
~~~
# Functions