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Clarify that 0 is a valid multiple of a type's alignment #1260

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Sep 10, 2022
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Clarify that 0 is a valid multiple of a type's alignment #1260

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6 changes: 4 additions & 2 deletions src/type-layout.md
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Expand Up @@ -20,8 +20,10 @@ The alignment of a value can be checked with the [`align_of_val`] function.

The *size* of a value is the offset in bytes between successive elements in an
array with that item type including alignment padding. The size of a value is
always a multiple of its alignment. The size of a value can be checked with the
[`size_of_val`] function.
always a multiple of its alignment. Note that some types are zero-sized; 0 is
considered a multiple of any alignment (for example, on some platforms, the type
`[u16; 0]` has size 0 and alignment 2). The size of a value can be checked with
the [`size_of_val`] function.

Types where all values have the same size and alignment, and both are known at
compile time, implement the [`Sized`] trait and can be checked with the
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