Re: linking tables to C++ objects?
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- Subject: Re: linking tables to C++ objects?
- From: "Wesley Smith" <wesley.hoke@...>
- Date: 2007年2月26日 17:23:27 -0800
I think, as suggested by Rici, that you need a table mapping C++
pointers to userdata in the Lua userdata's metatable. somehow you'll
need to get the lua_State. In this case, I assume a pointer is cached
in the cpp_class and that the table of cpp pointers to userdata is in
the metatable's "instances" field;
pseudo code
callback(cpp_class *c)
{
lua_State *L = c->lua();
luaL_getmetatable(L, cpp_class::metatable_name);
lua_pushstring(L, "instances");
lua_gettable(L, -2)
lua_pushinteger(L, (int)c);
lua_gettable(L, -2)
//either nil or your userdata will no be on the stack
}
Also I would make the "instances" table a weak table with __mode = "v"
wes