Conversion of false to object via const char * constructor

Question

I have built the following minimal example:

class A
{
    public:
        A(const char *s);

    private:
        const char *p;
};

A::A(const char *s)
  :          


        

Answer 1

For 1), false is of type bool, and it can be promoted to an int implicitely:

• the type bool can be converted to int with the value false becoming ​0​ and true becoming 1.

So, false is basically promoted to NULL/0 (or nullptr), which can be assigned to a pointer.

For 2), §4.10 states that:

A null pointer constant is an integer literal (2.14.2) with value zero or a prvalue of type std::nullptr_t.

A null pointer constant can be converted to a pointer type; [...]

Only a Null pointer constant can be converted to a pointer, and a null pointer constant is either an intergral with value 0 or std::nullptr_t. true (or 1 for that matter) aren't specified, and thus they can't be converted to a pointer.