gistfile1.c++

    lua_getglobal(L, "plugins");
    lua_pushnil(L);
    string pname;
    bool loaded = false;
    while (lua_next(L, -2) != 0) {
        /* key is at -2, value at -1 */
        if (lua_isstring(L, -2)) {
            pname = lua_tostring(L, -2);
            if (pname == name) {
                loaded = true;
            }
        }
        lua_pop(L, 1);
    }
    lua_pop(L, 1);
    return loaded;