Re: turn a lua function into a lua closure?

[Asko Kauppi <askok@...>]

Well, you can always use the 'string.dump()' method taught to me  
right here a while back.

1. f is Lua function
2. s= string.dump(f) makes a string dump of it
3. g= loadstring(s) recreates the same function

Try on your own risk!  May have side tastes... ;)  And does not keep  
upvalues, either.

-asko


Graham Wakefield kirjoitti 27.2.2007 kello 6.18:

> Ah, I should have said, a lua function, not a CFunction.
>
> Just tried this and I get a EXC_BAD_ACCESS; which I guess is due to  
> trying to convert a lua function into a lua_CFunction.
>
> Nevermeind, and thanks anyway.
>
> On Feb 26, 2007, at 7:53 PM, Mark Edgar wrote:
>
> > On 2/26/07, Graham Wakefield <lists@grahamwakefield.net> wrote:
> > > Hi,
> > >
> > > Is it possible to make a duplicate of a function in the C API?
> >
> > I believe the following should work:
> >
> > /* cfunction envtable -- newcfunction */
> > int makedupenv(lua_State * L)
> > {
> >  lua_CFunction f = lua_tocfunction(L, 1);
> >  luaL_argcheck(L, f != 0, 1, "expected C function");
> >  luaL_checktable(L, 2, LUA_TTABLE);
> >  /* note that the copy will not have any upvalues, even if the  
> > original does */
> >  lua_pushcfunction(L, f);
> >  lua_pushvalue(L, 1);
> >  lua_setfenv(L, 1);
> >  return 1;
> > }
> >
> > You can use lua_getupvalue() to duplicate the C function with all  
> > its upvalues.
> >
> >     -Mark