RE: Lua and C++ (stack)

[Erwin Oegema <blablaechthema@...>]

Npc * getNpc(lua_State *luaVm);

But yea, I don't know what the differences are (other than getting values from the top with negative values)...

> Date: Sun, 30 May 2010 12:33:42 +0200
> From: thomas@duboucher.eu
> To: lua@bazar2.conectiva.com.br
> Subject: Re: Lua and C++ (stack)
>
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> Le 30/05/2010 12:11, Erwin Oegema a écrit :
> >
> > Hello,
> >
> > I was wondering why my application doesn't get the correct values from the stack with this function under a Release build (it does work under Debug ...):
> >
> > int LuaExports::askNumber(lua_State *luaVm) {
> > getNpc(luaVm)->sendGetNumber(lua_tointeger(luaVm, -3), lua_tointeger(luaVm, -2), lua_tointeger(luaVm, -1));
> > return lua_yield(luaVm, 1);
> > }
> >
> > O.o... Sometimes the values are switched too...
> > Using the following code works perfectly:
> >
> > int LuaExports::askNumber(lua_State *luaVm) {
> >
> > getNpc(luaVm)->sendGetNumber(lua_tointeger(luaVm, 1),
> > lua_tointeger(luaVm, 2), lua_tointeger(luaVm, 3));
> >
> > return lua_yield(luaVm, 1);
> >
> > }
> >
> >
> > So I want to know what the correct (best?) way is to get a value from the stack?
> >
> > Thanks in advance.
> >
>
> Are you sure you understand the differences between positive and
> negative indexes for the stack? As for me, I prefer using negative
> indexes (my teachers told me to always access stack from the top).
> Also, for the differences between debug and release, I suspect that
> some aggressive optimization may change the order in which functions are
> called. I suppose that getNpc returns some kind of object or structure;
> I had problems like this with this kind of code when the compiler has no
> clues of how to optimize.
>
> Thomas.
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