structs terminology

[Shailesh Humbad]

Is there official terminology for these four different ways to declare
and/or define a struct?

struct tagname { ... } identifier;
struct { ... } identifier;
struct tagname { ... };
struct { ... };

Terms that have been thrown around are unnamed struct, anonymous
struct, and unnamed anonymous struct. I know that the last example
above is not legal C++, but it is supported by MSVC and gcc. I didn't
get a complete answer in microsoft.publi c.vc.language --
http://tinyurl.com/yqj9m (google groups)

[joey tribbiani]

Re: structs terminology

Shailesh Humbad wrote:[color=blue]
> Is there official terminology for these four different ways to declare
> and/or define a struct?
>
> struct tagname { ... } identifier;
> struct { ... } identifier;
> struct tagname { ... };
> struct { ... };
>
> Terms that have been thrown around are unnamed struct, anonymous struct,
> and unnamed anonymous struct. I know that the last example above is not
> legal C++, but it is supported by MSVC and gcc. I didn't get a complete
> answer in microsoft.publi c.vc.language -- http://tinyurl.com/yqj9m
> (google groups)[/color]

If the tagname ( sturcture-name ) is omitted, the variable is still to
be defined, but no data type is created. The data type for this variable
is an anonymous structure.

If the variable-name part is omitted, a structure type would be defined
you can use later to declare variables.

If both the variable-name and the sturcture-name are omitted, correct
but useless code is created.