Re: [Opencxx-users] parse error on valid code

[Christophe A. <chr...@la...>]

Well, more precisely :

in C you always need the prefix "struct" for a struct name.

for example :

struct object { ... };

struct object *new_object();
void init_object(struct object *object);

if you want to avoit to prefix "struct" you must use a typedef declaration :

typedef struct object { ... } object;

Now, in C++, you are not forced to prefix "struct", just give the name and
it knows whether it is a struct name, but indeed I noticed that g++ is okay
when using the prefix "struct" explicitly (prefix "class" also works most
time). My opinion is that it should be standard. Anyway if you want OpenC++
to be able to parse C source, you absolutely need to have this prefix,
because using "object" without its typedef declaration would lead a normal C
compiler to think it is an unknown type, whereas a C++ compiler would
recognize as a "struct object".

Regards



----- Original Message ----- 
From: "Stefan Seefeld" <se...@sy...>
To: <ope...@li...>
Sent: Wednesday, July 21, 2004 1:17 PM
Subject: Re: [Opencxx-users] parse error on valid code


> Christophe Avoinne wrote:
> > Forward declaration is not necessary with pointer (always a 4-byte
unsigned
> > integer for ia32), but you must use a tag name for the structure to
resolve
> > this lack of information :
> >
> > typedef struct Link_s {
> >     struct Link_s *next;
> >     int value;
> > } Link;
>
> interesting. I wasn't sure how standard compliant such a construct is
> (knowing that it comes from C...).
> Anyways, the important point here seems to be that the 'struct' tag
> serves the same purpose as the 'typename' keyword, i.e. it provides
> a hint to the parser to disambiguate the expression.
>
> Regards,
> Stefan
>
>
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