RE: Access to parameterized type
- From: William Adams <william_a_adams@xxxxxxx>
- To: "luajit@xxxxxxxxxxxxx" <luajit@xxxxxxxxxxxxx>
- Date: Sat, 1 Sep 2012 16:19:22 -0700
Perfect. Thanks.
________________________________
From: Mike Pall
Sent: 9/1/2012 3:15 PM
To: luajit@xxxxxxxxxxxxx
Subject: Re: Access to parameterized type
William Adams wrote:
> I have need to access the type of the parameter used to construct a
> parameterized structure:
> local Vector = ffi.typeof("struct { int n; int Capacity; $ *Data; }",
> ct);
> Is there any way to get at what 'ct' was from within a metamethod?
> I can find out how large it is by doing ffi.sizeof(instance.Data[0])
> but, all I get out of ffi.typeof(instance.Data) is "struct 102".
> Alternative, could I use "struct 102" in any meaningful way, like
> ffi.new("struct 102", 100);
ffi.new() takes a cdecl (a string), a ctype object or a cdata
object. So just use ffi.new(instance.Data[0], ...).
--Mike
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