Re: G_PARAM_SPEC_VALUE_TYPE() question

[David NeÄas <yeti physics muni cz>]

On Tue, May 15, 2012 at 08:39:12AM +0200, Marc Balmer wrote:
> I want to set properties of an object using the g_value_set_<type>()
> functions and to cast my value (which I get from a Lua script, which
> e.g. does not differentiate between integers and floats) I need to know
> the type of the property.
>
> Ideally something like the following:
>
> switch (G_PARAM_SPEC_VALUE_TYPE(prop)) {
> case G_TYPE_INT:
>       g_value_set_int(...);
>       break;
> case G_TYPE_STRING:
>       g_value_set_string(...);
>       break;
> }
>
> You get the idea...  This works for basic types, but not for e.g.
> GParamEnum, i.e. when G_PARAM_SPEC_TYPE_NAME() returns "GParamEnum",
> above scheme seems not to work.  There is a type G_TYPE_ENUM, but it is
> not returned in case of "GParamEnum".

You need to use g_type_is_a(...) on the type obtained from
G_PARAM_SPEC_TYPE_NAME(), not direct comparison to some explicit GTypes.
Then it will work also with subclassable types such as enums.

Yeti