conversion precedence in c++

Question

I have the following code:

Some functions:

A::A(int i_a) {cout<<\"int Ctor\\n\";}          //conversion constructor

void h(double d) {cout<<\"d         


        

Answer 1

Addition from standard(N4687)

2

When comparing the basic forms of implicit conversion sequences (as defined in 16.3.3.1)

— (2.1) a standard conversion sequence (16.3.3.1.1) is a better conversion sequence than a user-defined conversion sequence or an ellipsis conversion sequence, and

— (2.2) a user-defined conversion sequence (16.3.3.1.2) is a better conversion sequence than an ellipsis conversion sequence (16.3.3.1.3).