Module metatable

[Luis Carvalho <carvalho@...>]

Hi folks,

In loadlib.c, ll_module attributes a new metatable to a module. Wouldn't it be
nicer to check for a previously assigned MT first?

--- loadlib.c.orig      2005-02-20 21:57:34.386838440 -0500
+++ loadlib.c   2005-02-20 22:12:10.984575328 -0500
@@ -397,7 +397,7 @@
     lua_pop(L, 1);
   else {  /* no; initialize it */
     lua_pop(L, 1);
-    lua_newtable(L);  /* create new metatable */
+       if (!lua_getmetatable(L, -1)) lua_newtable(L); /* push metatable */
     lua_pushvalue(L, LUA_GLOBALSINDEX);
     lua_setfield(L, -2, "__index");  /* mt.__index = _G */
     lua_setmetatable(L, -2);

It's usually helpful to use module() as a class constructor instead of
module.new(), and that requires a __call metamethod. Can't think of any other
good motive, but, methinks, checking is always better anyway. :)

Cheers,
--luis

-- 
A mathematician is a device for turning coffee into theorems.
        -- P. Erdos 

-- 
Luis Carvalho
Applied Math PhD Student - Brown University
PGP Key: E820854A <carvalho@dam.brown.edu>

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