new macro luaL_opt to avoid evaluating defaults when no needed

1 files changed, 2 insertions, 1 deletions

diff --git a/lauxlib.h b/lauxlib.h
index f5ca0b44..7db3e95a 100644
--- a/lauxlib.h
+++ b/lauxlib.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.h,v 1.84 2005/08/26 17:36:32 roberto Exp roberto $
+** $Id: lauxlib.h,v 1.85 2005/09/06 17:19:51 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -114,6 +114,7 @@ LUALIB_API const char *(luaL_findtable) (lua_State *L, int idx,
 
 #define luaL_getmetatable(L,n)  (lua_getfield(L, LUA_REGISTRYINDEX, (n)))
 
+#define luaL_opt(L,f,n,d)       (lua_isnoneornil(L,(n)) ? (d) : f(L,(n)))
 
 /*
 ** {======================================================