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auto merge of #5852 : thestinger/rust/ffi, r=thestinger

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bors 2013-04-12 03:37:00 -07:00
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doc/tutorial-ffi.md
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@ -186,10 +186,11 @@ A `#[packed]` attribute is available, which will lay out the struct members with
However, there are currently no guarantees about the layout of an `enum`.
Rust's owned and managed boxes use non-nullable pointers as handles which point to the contained
object. However, they should not be manually because they are managed by internal allocators.
Borrowed pointers can safely be assumed to be non-nullable pointers directly to the type. However,
breaking the borrow checking or mutability rules is not guaranteed to be safe, so prefer using raw
pointers (`*`) if that's needed because the compiler can't make as many assumptions about them.
object. However, they should not be manually created because they are managed by internal
allocators. Borrowed pointers can safely be assumed to be non-nullable pointers directly to the
type. However, breaking the borrow checking or mutability rules is not guaranteed to be safe, so
prefer using raw pointers (`*`) if that's needed because the compiler can't make as many assumptions
about them.
Vectors and strings share the same basic memory layout, and utilities are available in the `vec` and
`str` modules for working with C APIs. Strings are terminated with `\0` for interoperability with C,