Re: compare function for GValues

[Todd Fisher <toddf simosoftware com>]

Hi Stefan,
  
   I think this might be what you're looking for.  It might need to be 
modified to handle more types, but
for the simple types it should do the job.

-todd

Stefan Kost wrote:

> hi hi,
>
> we have lots of methods in our project the looksup list-entries by a gobject
> property (the lists node->data entries are gobject instances).
> We would like to generalize the code - something like below:
>
> -- pseudo code --
>
> find_by_property(gpointer item,gpointer data) {
> GValue value;
> g_object_get_property(item,data.key,&value);
> //a) compare via
>      strcmp(find_by_property(value),find_by_property(data.compare_value));
> //b) switch(g_value_get_type(value)) {
> //     G_TYPE_STRING: strcmp(value,data.compare_value);
> //     default: value==data.compare_value;
> //   }
> }       
>         
> struct {
>  gchar *key;
>  GValue compare_value;
> } data;
> g_value_init(data.compare_value, G_TYPE_STRING);
> g_value_set_string(data.compare_value,id);
> data.key="id";
>         
> node = g_list_find_custom(self->priv->machines, data, find_by_property);
> if(node) return(BT_MACHINE(node->data);
>
> -- pseudo code --
>
> Any ideas how to best handle the missing copare function in the GValue system?
>
> Stefan
>  
>
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