Re: [ANN] Weak Type: A type library for the weak (hack stage)

[Philipp Janda <siffiejoe@...>]

Am 12.08.2013 16:43 schröbte Andrew Starks:
> On Sat, Aug 10, 2013 at 6:16 AM, John Hind <john.hind@zen.co.uk> wrote:
> > I like this a lot.
> >
> > One possible extension is to follow the lead of luaL_checkudata surfacing
> > this test in Lua. So if a type is defined using a userdata with a metatable
> > stored under a type name in the registry (as the C API encourages):
> >
> > type(x, "mytype")
> >
> > checks if type is a userdata or table with a metatable equal to the table
> > stored in the registry under the key "mytype".
> >
> > This allows for the test to work even if a "type" metavalue is not defined.
>
> John,
>
> Thanks man!
>
> I love your idea. It's actually the problem that I set out to solve,
> before I learned I would need the C-API to solve it.

No need for the C API if you have the debug module available:

    > print( debug.getregistry()["FILE*"], debug.getmetatable( io.stdin ) )
    table: 0x7446d0	table: 0x7446d0


> [...]
>
> - Andrew

Philipp