The number 0 as a symbol?

Question

C++ / C#

Hello, I just came across an interesting (as it seemed to me) feature. I'm not sure exactly why, but when calling overloaded functions with a value of 0, an error pops up

call to member function 'SetAttrib' is ambiguous

, and therefore it is necessary to cast this value to an int. Is this really due to the old understanding by the compiler that 0 == nullptr? Or am I not understanding something?
PS: I'm just writing using C++11 and it's strange that 0 and nullptr are the same thing for the compiler.

Answer 1

>weird that 0 and nullptr are the same thing to the compiler.
and they should be the same by definition.
>call to member function 'SetAttrib' is ambiguous
means you have a function that accepts both an int and a pointer. and 0 can be both

Answer 2

Or am I not understanding something?

In this case, I don't understand. So do you have 0 as a pointer or character?
Give the function signature.