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Improve some pointer-related documentation #62822

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Merged
merged 8 commits into from
Jul 26, 2019
Merged

Improve some pointer-related documentation #62822

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21b502b
warn that raw pointers must be aligned when used, and that writes cau…
RalfJung Jul 20, 2019
2e6b13a
references must be aligned; also move up the warning that fn ptrs mus…
RalfJung Jul 20, 2019
f502bf7
sync with nomicon: raw ptr must be non-dangling and aligned every tim…
RalfJung Jul 21, 2019
4081222
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RalfJung Jul 21, 2019
a7b9246
weasle, weasle
RalfJung Jul 22, 2019
9196781
account for non-drop-glue types
RalfJung Jul 22, 2019
dd5045e
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RalfJung Jul 23, 2019
65cf10d
word things more like we usually do
RalfJung Jul 23, 2019
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word things more like we usually do
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@RalfJung
RalfJung committed Jul 23, 2019
commit 65cf10d90276e40bd8cc27a79d6c6f0d13e0cc7a
4 changes: 2 additions & 2 deletions src/libstd/primitive_docs.rs
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Expand Up @@ -900,8 +900,8 @@ mod prim_usize { }
/// For those familiar with pointers, a reference is just a pointer that is assumed to be
/// aligned, not null, and pointing to memory containing a valid value of `T` - for example,
/// `&bool` can only point to an allocation containing the integer values `1` (`true`) or `0`
/// (`false`), but the behavior of creating a `&bool` that points to an allocation containing
/// the value `3` is undefined.
/// (`false`), but creating a `&bool` that points to an allocation containing
/// the value `3` causes undefined behaviour.
/// In fact, `Option<&T>` has the same memory representation as a
/// nullable but aligned pointer, and can be passed across FFI boundaries as such.
///
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