turn a lua function into a lua closure?

[Graham Wakefield <lists@...>]

Hi,

Is it possible to make a duplicate of a function in the C API?  I'd  
like to be able to duplicate a function in order to set and retain a  
different environment on each copy.

function f() print(foo) end
tab1 = { foo = 1 }
tab2 = { foo  = 2 }
ftab1 = makedupenv(f, tab1)	-- where makedupenv is a lua_CFunction as  
below
ftab2 = makedupenv(f, tab2)	
ftab1()	--> 	1
ftab2()	--> 	2


// arg 1 is a function
// arg 2 is a table
int makedupenv(lua_State * L)
{
	// Q? how to I make a copy of function f ?	

	lua_pushvalue(L, 2);	// push table
	lua_setfenv(L, 1);		// set environment of f		// this should setfenv  
on a COPY of f.

	return 1;
}


Thanks in advance!