#include <iostream>
using namespace std;

class A
{
public:
    A(int);				// non-explicit ctor
};


class B
{
public:
    explicit B(int);			// explicit ctor
};

A::A(int)
{
    cout << "A ctor called\n";
}

B::B(int)   				// do not repeat keyword explicit
{
    cout << "B ctor called\n";
}

void funkA(A object)
{
    cout << "funkA called\n";
}

void funkB(B object)
{
    cout << "funkB called\n";
}

void funkAB(A obj)
{
    cout << "funkAB(A) called\n";
}

void funkAB(B obj)
{
    cout << "funkAB(B) called\n";
}

int main()
{
    A objA(2);		// instantiate an A object
    B objB(3);		// instantiate a B object

    funkA(objA);	// call funkA() with an exact argument match

    funkA(9);		// call funkA() with an non-exact argument match

    funkB(objB);	// call funkB() with an exact argument match

    //  funkB(16);  // error: cannot convert int to a B object

    funkAB(6);		// compile error if B(int) is not explicit
}