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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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@ -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`. 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 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. object. However, they should not be manually created because they are managed by internal
Borrowed pointers can safely be assumed to be non-nullable pointers directly to the type. However, allocators. Borrowed pointers can safely be assumed to be non-nullable pointers directly to the
breaking the borrow checking or mutability rules is not guaranteed to be safe, so prefer using raw type. However, breaking the borrow checking or mutability rules is not guaranteed to be safe, so
pointers (`*`) if that's needed because the compiler can't make as many assumptions about them. 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 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, `str` modules for working with C APIs. Strings are terminated with `\0` for interoperability with C,