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C++11 - Understanding SFINAE

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SFINAE(substution failure is not an error) is hard to understand at glance but following article explains the concept of SFINAE eaiser way with a clear examp...

Rx - Difference Hot and Cold observer

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Hot: If observerable start emitting items as soon as created, it is called "Hot" Cold: Observerable will start to emit items when it is subscribed.