How should I bind lua functions to C++ functions? -

i have class called entity, has many functions onpickup, ondrop, onuse etc. want is, write script defines of these functions , make them callable c++ functions. functions defined in c++ calling corresponding lua functions have functionality.

but here's problem, want every script write, every entity in program working in it's own scope.

i'm using luabind, , have no prior experience lua, i'm little lost here.

i don't use lua bind may help. idea register lua functions in c++ class , keep reference lua function in c++ class.

to define lua function callable c/c++ use lual_ref store reference callback function in c++ object.

// little helper function template <typename t> t *lua_getuserdata(lua_state *l) {     assert(lua_isuserdata(l, 1) == 1);     t **v = (t **) lua_touserdata(l, 1);     assert(v != null);     return *v; }  int lua_formregistermethods(lua_state *l) {     entity *f = lua_getuserdata<entity>(l);     assert(lua_istable(l, 2) == 1); // check next parameter table     lua_pushvalue(l,2); // dup table     f->luatable = lual_ref(l, lua_registryindex); // keep reference table     lua_getmetatable(l, 2); // metatable     lua_pushstring(l, "onclick");      lua_rawget(l, -2); // onclick lua function     f->luamethod = lual_ref(l, lua_registryindex); // save reference     return 0; } 

and can lua method in c++ event

lua_rawgeti( luainstance->l, lua_registryindex, luamethod ); assert(lua_isfunction(luainstance->l, -1) == 1); 

now can call function self set table saved earlier. hth