Re: GtkArg typesafety

[David Benson <daveb idealab com>]

For that amount of typing you could say:

	GtkArg arg = {0};
	arg.type = GTK_TYPE_INT;
	arg.name = "blah"
	GTK_VALUE_INT(arg) = 42;
	gtk_object_setv(object, 1, &arg);

And *this* mess could be generically wadded into a macro.

(Although I'm not sure this is recommended otherwise since GtkArg
might theoretically change...)

I do agree with you fundametally btw:  it is annoying that you
cannot change a double => int or vice versa 
at the object level w/o hand-checking
for all instances of set_arg and similar ilk.


- Dave

On Tue, 4 Jan 2000, George wrote:

> On Tue, Jan 04, 2000 at 12:02:05PM -0500, Havoc Pennington wrote:
> > IMO this is much extra complexity for very little gain (it avoids the
> > "0" is not a double problem, but that's all really; it doesn't solve
> > the problem of passing entirely the wrong type or getting const-ness
> > wrong). And it ruins the nice syntax which is 85% of the point of
> > arguments.
> 
> Ok, added full type safety, so with this, using args is just as type safe as a
> normal function call.
> 
> #ifdef __GNUC__
> #define MY_PERSON_ARG_NAME(arg)    	"name",({char *z = (arg); z;})
> #define MY_PERSON_GET_ARG_NAME(arg)	"name",({char **z = (arg); z;})
> #define MY_PERSON_ARG_DOB(arg)    	"dob",({glong z = (arg); z;})
> #define MY_PERSON_GET_ARG_DOB(arg)	"dob",({glong *z = (arg); z;})
> #define MY_PERSON_ARG_DOD(arg)    	"dod",({glong z = (arg); z;})
> #define MY_PERSON_GET_ARG_DOD(arg)	"dod",({glong *z = (arg); z;})
> #else /* __GNUC__ */
> #define MY_PERSON_ARG_NAME(arg)    	"name",(char *)(arg)
> #define MY_PERSON_GET_ARG_NAME(arg)	"name",(char **)(arg)
> #define MY_PERSON_ARG_DOB(arg)    	"dob",(glong )(arg)
> #define MY_PERSON_GET_ARG_DOB(arg)	"dob",(glong *)(arg)
> #define MY_PERSON_ARG_DOD(arg)    	"dod",(glong )(arg)
> #define MY_PERSON_GET_ARG_DOD(arg)	"dod",(glong *)(arg)
> #endif /* __GNUC__ */
> 
> This not only casts, but gives a warning even on wrong pointer types.  I'm
> really starting to like GNU C extentions.
> 
> George
> 
> 
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