Re: turn a lua function into a lua closure?
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- Subject: Re: turn a lua function into a lua closure?
- From: "Mark Edgar" <medgar123@...>
- Date: 2007年2月26日 20:53:34 -0700
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