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Void() in a structure

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Davng

Joined: 11 Sep 2003
Posts: 2

Void() in a structure

Posted: Fri Sep 10, 2004 8:48 am

Why I can't use this piece of code?

Code:

typedef const struct _rom_desc_tsk
{
unsigned char prioinit;
unsigned int stackAddr;
void *nParameters; // Unknown type!
unsigned char futur_use;
unsigned char id_tch;
unsigned int ctx_tch;
} rom_desc_tsk;

The compiler don't let me use a void pointer inside the structure! The error that show me is: "unknown type"

thnx in advance

davng

Ttelmah
Guest

Re: Void() in a structure

Posted: Fri Sep 10, 2004 10:21 am

Davng wrote:

Why I can't use this piece of code?

Code:

The compiler don't let me use a void pointer inside the structure! The error that show me is: "unknown type"

thnx in advance

davng

I'm not suprised.
'void' has two different meanings. The first is effectively a 'null' defintion for data types (as in a function that returns nothing). The second form, _was an extension to C, that is part of the ANSI definitions_, where it replaces 'char *', as the generic data pointer. CCS C, _is not ANSI C_. It retains the original K&R defintions, where char * is the generic pointer.
Some 'ANSI like' forms are allowed in places, but most are dubious, and should be used with care...
Basically you are trying to use an ANSI C structure, in a C that does not relibly support this.
Change it to char *, and cast it to the type that is actually required, when accessed.

Best Wishes

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