Re: problem with calling lua5 from c++

[Peter Shook <pshook@...>]

To get the number on top of the stack, you should use -1 for the index.
In Lua 5.0, lua_baselibopen(L) leaves a table on top of the stack now, 
so the result isn't at stack index 1.

- Peter Shook

$ diff -u add.cc  fixed.cc
--- add.cc      2003-05-05 15:31:39.000000000 -0400
+++ fixed.cc    2003-05-05 15:31:33.000000000 -0400
@@ -3,6 +3,7 @@

 extern "C" {
   #include "lua.h"
+  #include "lauxlib.h"
   #include "lualib.h"
 }

@@ -27,7 +28,7 @@
   lua_call(L, 2, 1);

   /* get the result */
-  sum = (int)lua_tonumber(L, 1);
+  sum = (int)lua_tonumber(L, -1);
   lua_pop(L, 1);

   return sum;
@@ -38,10 +39,11 @@
   int sum;

   /* initialize Lua */
-  L = lua_open(0);
+  L = lua_open();

   /* load Lua base libraries */
   lua_baselibopen(L);
+  lua_settop(L, 0);

   /* load the script */
   lua_dofile(L, "add.lua");