DaWei

You're not paying attention to your responses, or, at least, not incorporating the suggestions. The exclamation points suggest, perhaps, a degree of frustration. Relax and re-read your responses, which are cogent.

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Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code.
Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers