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tutorial: Emphasize GC in shared box section

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Brian Anderson 2012-07-09 21:02:36 -07:00
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@ -1266,13 +1266,7 @@ All pointer types can be dereferenced with the `*` unary operator.
## Shared boxes
Shared boxes are pointers to heap-allocated, reference counted memory.
A cycle collector ensures that circular references do not result in
memory leaks.
> ***Note:*** We will in the future switch to garbage collection,
> rather than reference counting, for shared boxes.
Shared boxes are pointers to heap-allocated, garbage collected memory.
Creating a shared box is done by simply applying the unary `@`
operator to an expression. The result of the expression will be boxed,
resulting in a box of the right type. Copying a shared box, as happens
@ -1287,6 +1281,10 @@ let y = x; // Copy the pointer, increase refcount
Shared boxes never cross task boundaries.
> ***Note:*** shared boxes are currently reclaimed through reference
> counting and cycle collection, but we will switch to a tracing
> garbage collector.
## Unique boxes
In contrast to shared boxes, unique boxes have a single owner and thus