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doc: Fix some inaccuracies in the tutorial.

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* Pointers can refer to stack objects as well as heap objects.

* Non-managed types can be cyclic if an arena is used.
This commit is contained in:
Patrick Walton 2012-10-09 21:21:07 -07:00
parent f016fd43f8
commit 6da09c3b43
1 changed files with 2 additions and 3 deletions
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doc/tutorial.md
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@ -1054,7 +1054,7 @@ copied, not just a pointer.
For small structs like `Point`, this is usually more efficient than
allocating memory and going through a pointer. But for big structs, or
those with mutable fields, it can be useful to have a single copy on
the heap, and refer to that through a pointer.
the stack or on the heap, and refer to that through a pointer.
Rust supports several types of pointers. The safe pointer types are
`@T` for managed boxes allocated on the local heap, `~T`, for
@ -1087,8 +1087,7 @@ let y = x; // Copy of a pointer to the same box
~~~~
Any type that contains managed boxes or other managed types is
considered _managed_. Managed types are the only types that can
construct cyclic data structures in Rust, such as doubly-linked lists.
considered _managed_.
~~~
// A linked list node