On 2005-02-02, Nick Patavalis <npat@xxxxxxxxxx> wrote:
>
> So in my original example, if I added something like "foo.b++", it
> would fail. The error message is:
>
> error: increment of pointer to unknown structure
> error: arithmetic on pointer to an incomplete type
>
> Which indicates that "struct bar" is indeed a defined, but incomplete,
> data-type, and that it is ok to define pointers to incomplete
> data-types. Such pointers (i.e. pointer to incomplete data-types) have
> "special" semantics (similar but not identical to those of "void"
> pointers).
And the validation from the scriptures (ANSI/ISO 9899-1990):
- *Section 6.1.2.5, pg.24, par.4*: A structure or a union of unknown
content (as described in 6.5.2.3) is an incomplete type.
- *Section 6.5.2.3, pg 62*: If a type-secifier of the form
struct-or-union identifier
occurs prior to the declaration that defines the content, the
structure or union is an incomplete type.
- *Section 6.1.2.5, pg.23, last list-item*: A pointer type may be
derived from a function type, an object type or an incomplete
type.
/npat
