NULL vs nullptr (Why was it replaced?) [duplicate]

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nullptr has type std::nullptr_t. It’s implicitly convertible to any pointer type. Thus, it’ll match std::nullptr_t or pointer types in overload resolution, but not other types such as int.

0 (aka. C’s NULL bridged over into C++) could cause ambiguity in overloaded function resolution, among other things:

f(int);
f(foo *);

(Thanks to Caleth pointing this out in the comments.)

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