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Size fo empty structs in C is zero byte. #782

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merged 2 commits into from Apr 2, 2020
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Size fo empty structs in C is zero byte. #782

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Size fo empty structs in C is zero byte.
ldm0 Mar 13, 2020
30af091
Further improvement
ldm0 Mar 13, 2020
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8 changes: 6 additions & 2 deletions src/type-layout.md
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Expand Up @@ -236,8 +236,12 @@ the sake of clarity. To perform memory layout computations in actual code, use

</div>

> Note: This algorithm can produce zero-sized structs. This differs from
> C where structs without data still have a size of one byte.
> Note: This algorithm can produce zero-sized structs. In C, an empty struct
> declaration like `struct Foo { }` is illegal. However, both gcc and clang
> support options to enable such structs, and assign them size zero. C++, in
> contrast, gives empty structs a size of 1, unless they are inherited from or
> they are fields that have the `[[no_unique_address]]` attribute, in which
> case they do not increase the overall size of the struct.
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#### \#[repr(C)] Unions

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