WinToast is a lightly library written in C++ which brings a complete integration of the modern toast notifications of Windows 8 & Windows 10. Toast notifications allows your app to inform the users about relevant information and timely events that they should see and take action upon inside your app, such as a new instant message, a new friend request, breaking news, or a calendar event.
Use of a null handler isn't immediately fatal. However it will eventually lead to a crash. This enforces correct usage.