Why can't nullptr convert to int?

Question

Summary: nullptr converts to bool, and bool converts to int, so why doesn\'t nullptr convert to int

Answer 1

The keyworkd nullptr is introduced in c++11 because multiple definition of the C NULL, and it confuses when overloading a function with int arguments and NULL.

#define NULL 0
#define NULL (void*)0

In the bible The C++ Programming Language (4th), page 270

The pointer-to-bool conversion is useful in conditions, but confusing elsewhere.

So I think nullptr_t varible convert to int is not allowed because that's the reason why it exists, but it can be used as a test condition like bool variables.