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  • C# can also make use of anonymous classes. See the second and fourth examples in my answer. Commented Nov 3, 2014 at 22:21
  • @RobertHarvey: My point isn't that Scala has unique features but that there's something syntactically similar in Scala, but it isn't an initializer (something similar could be said for C#'s anonymous classes; is that what your comment means?). In your two examples, aren't the anonymous classes syntactically and semantically different from the initializers? Syntactically, the anonymous class takes the place of the constructor call; semantically, initializers don't involve the creation of an anonymous class. In Scala, the anonymous class is in addition to the constructor call. Commented Nov 3, 2014 at 23:04
  • The problem with UIS is that it introduces new ambiguity: std::vector<std::string>(1) and std::vector<std::string>{1} means the same, while std::vector<int>(1) and std::vector<int>{1} are different. For this reason, it is more confusing than helpful, and I think it is of negative value introducing it to c++11. Commented Nov 4, 2014 at 8:53