Task #2116
Updated by Junxiao Shi over 9 years ago
Rewrite EventEmitter with C++11 features such as [parameter pack](http://en.cppreference.com/w/cpp/language/parameter_pack). One benefit is to reduce code duplication. <s>EventEmitter EventEmitter should allow unsubscribing a single EventHandler without affecting other EventHandlers.</s> EventHandlers. This change must be backwards-compatible.