typedef struct question

**flevine100** · 09-03-2002

I am trying to incorporate some OpenGL code into my Kylix3 app, and have run across a difficulty not with OpenGL or Kylix, but C of all things.

in Kylix, there is the following typedef:
typedef struct QWidget__
{
int dummy;
} *QWidgetH

Now, I have a function that returns me a QWidgetH *, and I have another function that needs to have a QWidget__ * passed into it. My problem is:

What the heck does that typedef mean? I am familiar with 'tagging' a struct so you can reference it from within the struct.... but this is strange. What does:

typedef struct a__ {int dummy} *a mean? What do you think is the proper incantation of *'s and &'s to massage my QWidgetH * into a QWidget__ *?

Any help you can provide would be appreciated.

**quzah** · 09-03-2002

struct x { };l

Define a structure named 'x'.

struct x { } y;

Define a structure named 'x', and create an instance of it, called 'y'.

typedef struct x y;

Define a new type, called 'y', which is of type 'struct x'.

So, if I want an instance of this last item:

struct x myInstance;

Or:

y myInstance;

They're the same thing.

Any questions?

Quzah.

Thread: typedef struct question

Thread Tools

Search Thread

Display

typedef struct question

Similar Threads

Need help with linked list sorting function

struct question

typedef struct

Need help understanding info in a header file

Dikumud