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#include <iostream>
 
using namespace std;
 
 
 
class A
{
    int x;
public:
    A() : x(0)
    {}
    A(int a) : x(a)
    {}
    ~A()
    {}
    A  operator + (const A &rhs)
    {
    	return A(x+rhs.x);
    }
 
    operator int() const
    {
        return x;
    }
};
 
int main()
{
    A a = 4, c;
    c = 6 + a;
 
    std::cout << c << std::endl;
 
    c = a + 6;
 
    std::cout << c << std::endl;
 
    return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:35:11: error: ambiguous overload for 'operator+' (operand types are 'A' and 'int')
     c = a + 6;
           ^
prog.cpp:35:11: note: candidate: operator+(int, int) <built-in>
prog.cpp:17:8: note: candidate: A A::operator+(const A&)
     A  operator + (const A &rhs)
        ^

Standard output is empty