From 053e87314596e48588a929791012def7818ec989 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Fri, 21 Oct 2005 11:47:42 -0200
Subject: new macro luaL_opt to avoid evaluating defaults when no needed

---
 lauxlib.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lauxlib.h')

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)))
 
 /*
 ** {======================================================
-- 
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