Help With Boolean Expressions

Originally Posted by Elysia

I suppose I understand where you are coming from, but I think it would be better to say that a null pointer is considered false. NULL is a null constant (which should not be used nowadays!) which should only be used with pointers, and as such, its meaning by itself should be "undefined."

It would be better to say that, when converted to bool, zero evaluates to false and a null pointer evaluates to false.

Originally Posted by Elysia

I cannot get if (!nullptr) to compile, however.

There is a conversion from std::nullptr_t to bool, and "the operand of the logical negation operator ! is contextually converted to bool". Therefore, !nullptr should be valid, with a value of true.

Well, Visual C++ doesn't like it. That's for sure.