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UB definition: mention size_of_val for determining a reference's span #793

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Apr 11, 2020
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UB definition: mention size_of_val for determining a reference's span #793

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10 changes: 5 additions & 5 deletions src/behavior-considered-undefined.md
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Expand Up @@ -61,11 +61,11 @@ code.
A reference/pointer is "dangling" if it is null or not all of the bytes it
points to are part of the same allocation (so in particular they all have to be
part of *some* allocation). The span of bytes it points to is determined by the
pointer value and the size of the pointee type. As a consequence, if the span is
empty, "dangling" is the same as "non-null". Note that slices point to their
entire range, so it is important that the length metadata is never too
large. In particular, allocations and therefore slices cannot be bigger than
`isize::MAX` bytes.
pointer value and the size of the pointee type (using `size_of_val`). As a
consequence, if the span is empty, "dangling" is the same as "non-null". Note
that slices point to their entire range, so it is important that the length
metadata is never too large. In particular, allocations and therefore slices
cannot be bigger than `isize::MAX` bytes.

> **Note**: Undefined behavior affects the entire program. For example, calling
> a function in C that exhibits undefined behavior of C means your entire
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