Implicit conversion from int to shared_ptr

Question

Consider the code below:

#include 
#include 

void f(std::shared_ptr sp) {}

template 

        

Answer 1

The firs call f(0) is compiled as f(nullptr), which is fine for the compiler (but it should not be in my opinion). The second call will create declaration for a function to work on any int, which is illegal.

Funny thing is, that even this code works:

f(3-3);
f(3*0);