[PD-dev] How to check data type of arguments in object

[Alexandros Drymonitis]

Just for the archive, here's a very minimal object that detects the type 
of the arguments:

```
#include <m_pd.h>

static t_class *var_args_class;

typedef struct _var_args {
         t_object x_obj;
} t_var_args;

void *var_args_new(t_symbol *s, int argc, t_atom *argv)
{
         t_var_args *x = (t_var_args *)pd_new(var_args_class);
         int i;

         for (i = 0; i < argc; i++) {
                 if (argv->a_type == A_FLOAT) {
                         float f = atom_getfloat(argv);
                         post("argumenat at position %d is float: %f", 
i, f);
                 }
                 else if (argv->a_type == A_SYMBOL) {
                         t_symbol *s_local = atom_gensym(argv);
                         post("argument at position %d is symbol: %s", 
i, s_local->s_name);
                 }
                 argv++;
         }
         return (x);
}

void var_args_setup(void)
{
         var_args_class = class_new(gensym("var_args"), 
(t_newmethod)var_args_new,
                 0, sizeof(t_var_args), CLASS_DEFAULT, A_GIMME, 0);
}

```

On 9/12/23 22:15, Alexandros Drymonitis wrote:
> Or actually, argv->a.type == A_FLOAT. Sorry for clogging the list, 
> just wanted to pass the correct information, unless I'm wrong again...
>
> On 9/12/23 19:30, Alexandros Drymonitis wrote:
>> I replied a bit too fast, I guess it should be argv.a_type == A_FLOAT 
>> and likewise for symbol. I'll give it a try.
>>
>> On 9/12/23 19:28, Alexandros Drymonitis wrote:
>>> Does this mean that I have to check sort of like this:
>>>
>>> if (argv == A_FLOAT) {
>>>     /* do something with the float arg */
>>> }
>>> else if (argv == A_SYMBOL) {
>>>     /* do something with the symbol arg */
>>> }
>>>
>>> On 9/12/23 18:55, IOhannes m zmölnig wrote:
>>>> https://github.com/pure-data/externals-howto#class_new-1
>>>> https://github.com/pure-data/externals-howto#atoms
>>>>
>>>> mfg.sfg.jfd
>>>> IOhannes
>>>>
>>>>
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