Update README.md

mrgloom · Nov 13, 2017 · c910cae · c910cae
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@@ -48,6 +48,10 @@ http://stackoverflow.com/questions/631783/what-is-the-use-of-having-destructor-a
 
 operator overloading outside class
 https://stackoverflow.com/questions/2425906/operator-overloading-outside-class
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+volatile keyword
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+mutable keyword
 ~~~
 
 #Patterns