Re: char data[0]

Bill Reid wrote:

Chris Dollin <chris.dollin@xxxxxx> wrote in message
news:eglkil$v0b$1@xxxxxxxxxxxxxxxxxxxxxxx
Bill Reid wrote:

As I learned the hard way (reading the FAQ) last night, structs are
actually "self-aligned" (translation: "start at") "by their most
restrictive
member", meaning the largest type in the struct (or this is how I
understand it).

Which bit of the FAQ reads like that?

2.12, "Additional Links"->Eric Raymond post:

On modern 32-bit machines like the SPARC or the Intel [34]86, or
any Motorola chip from the 68020 up, each data iten must usually be
``self-aligned'', beginning on an address that is a multiple of its type
size.
Thus, 32-bit types must begin on a 32-bit boundary, 16-bit types on a
16-bit boundary, 8-bit types may begin anywhere, struct/array/union
types have the alignment of their most restrictive member.

---end of excerpt

So as I take it, compilers on most 32-bit machines today set up
struct alignment based on
the aligment of "their most restrictive member".

Padding bytes, enable member alignment
to be independant of struct alignment,
except for the first member.

--
pete
.

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