COMP: Add nullptr instead of NULL or 0
https://stackoverflow.com/questions/13816385/what-are-the-advantages-of-using-nullptr C++11 introduces nullptr, it is known as the Null pointer constant and It improves type safety and resolves ambiguous situations unlike the existing implementation dependent null pointer constant NULL. https://msdn.microsoft.com/en-us/library/4ex65770.aspx The nullptr keyword can be used to test if a pointer or handle reference is null before the reference is used. Function calls among languages that use null pointer values for error checking should be interpreted correctly. You cannot initialize a handle to zero; only nullptr can be used.
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