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doc: Fix tutorial for struct deref

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Brian Anderson 2014-01-04 12:13:31 -08:00
parent 2d8fbba57d
commit ec69dea6f7
1 changed files with 10 additions and 10 deletions
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doc/tutorial.md
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@ -793,15 +793,6 @@ synonym for an existing type but is rather its own distinct type.
struct GizmoId(int); 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 Types like this can be useful to differentiate between data that have
the same underlying type but must be used in different ways. 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 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 # Functions