Google Play Games services has three types of format in its library. One for Android that uses Java, one for iOS which is called Objective-C and a cross platform called C++ that can be accessed by both Android and iOS.
The cross platform format (C++) is important as it allows developers to maintain familiar code between the Android and iOS implementations of their software. Sadly, the cross platform format can sometimes get left behind as Google gives a greater preference to the native Android and iOS versions. Also, there was a piece of objective that was missing from the cross platform C++ SDK for the support for Real-time Multiplayer Gaming (RTMP).
Fortunately, Google has just updated it’s Play Games Services to bring the C++ SDK to feature consistency with the Play Services SDK on Android and the Play Games iOS SDK. Now, game developers who have both Android and iOS versions of their games can safely add Real-time Multiplayer support using a single C++ code base.
Besides that, game developers can visit the Developer Console to see how players are using the multiplayer integration and see the overall usage trends.
Meanwhile, Google has updated a few other features in the Play Game Services. Clearly, it has incorporated materiel design into the user interface of the latest Play Games services SDK for both cross platform C++, Android and iOS.
Source: Android Authority