C言語によるlua関数の呼び出しを考慮する必要がある

int LuaTest::Attach(lua_State* luaState)
{
    if(lua_isfunction(luaState, 1) ! = 1)
    {
        return 0;
    }
    lua_settop(luaState, 1);
    m_nRef = luaL_ref(luaState, LUA_REGISTRYINDEX); // save to LUA_REGISTRYINDEX table
    lua_pushinteger(luaState, nRef);
    return 1;
}

int LuaTest::Detach(lua_State* luaState)
{
    m_nRef = luaL_checknumber(luaState, 1);
    luaL_unref(luaState, LUA_REGISTRYINDEX, nRef); // remove from LUA_REGISTRYINDEX table
    m_nRef = 0;
    return 0;
}

// Event listener function
void LuaTest::EventListener(lua_State* luaState)
{
    lua_rawgeti(luaState, LUA_REGISTRYINDEX, m_nRef); // Get from the LUA_REGISTRYINDEX table
    lua_pushstring(luaState, "parameter1");
    lua_pushstring(luaState, "argument2");
    lua_pcall(luaState, 2, 1, 0); // call the lua function
    int nRet = luaL_checknumber(luaState, -1); // return value
}