Java-style annotations in Ruby and C++?

1. What would be the way to have java-style annotations in Ruby and in C++?

(Optionally, perhaps it is a matter of taste)

2. Are java-style annotations worth to be used, so you would rec开发者_C百科omend using them in other languages, if possible?

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Java-like annotations in Ruby

How to simulate Java-like annotations in Ruby?

But, in C++?