Thanks! I hadn't thought about using Class.new to avoid assigning it
as a separate constant.

In this case though I was wondering about the name within the struct,
not the Ruby constant representing the union. In the original C
definition the union has no name - is assigning something arbitrary
the best way to go, e.g. :union in Postmodern's example?

On Sun, Oct 13, 2013 at 5:43 PM, Wayne Meissner <wmeissner@gmail.com> wrote:

> Yep, that should work.  Can even leave off the class_eval -
>
> Class.new(FFI::Union) do
>   layout :msg, :pointer,
>             :song_end, UadeNotificationSongEnd
> end
>
> The only things that won't work are typedefs/aliases - they use a hacky way
> to find the enclosing module (which contains the typedef table), which won't
> work with anon classes.
>
> Lexically scoped things will work fine though (and the built in FFI types)
>
>
> On Sunday, 13 October 2013 10:23:08 UTC+11, Postmodern wrote:

>>
>> Usually I just come up with some name for anonymous structs/unions.
>> However, I wonder if you could do
>>
>> layout :type, :uade_notification_type,
>>        :union, Class.new(FFI::Union).class_eval do
>>                  ...
>>                end
>>
>> or something similar?
>>
>> On 10/12/2013 04:44 AM, Misty De Meo wrote:
>>
>> How can I represent an anonymous union in FFI?
>>
>> A struct I'm wrapping has the following structure:
>>
>> struct uade_notification {
>>     enum uade_notification_type type;
>>     union {
>>         char *msg;
>>         struct uade_notification_song_end song_end;
>>     };
>> };
>>
>> I can create a union using FFI::Union of course, but I'm not sure how to
>> represent that in a struct layout. Is assigning it an arbitrary name the
>> right way to go?
>>
>> Best,
>> Misty
>> --
>>
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>> --
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>> GitHub: https://github.com/postmodern
>> Twitter: @postmodern_mod3
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