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#include <stdio.h>
 
class A
{
public:	
};
 
class B
{
public:
    B(const A &a) { printf("const A&\n");}
    B(A a){ printf("A\n");}
};
 
int main(void) {
 
    A a;
    const A ac;
    B b(a);
    B b1(ac);
    B b2(A());
 
	return 0;
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:19:10: error: call of overloaded ‘B(A&)’ is ambiguous
     B b(a);
          ^
prog.cpp:12:5: note: candidate: B::B(A)
     B(A a){ printf("A\n");}
     ^
prog.cpp:11:5: note: candidate: B::B(const A&)
     B(const A &a) { printf("const A&\n");}
     ^
prog.cpp:8:7: note: candidate: constexpr B::B(const B&)
 class B
       ^
prog.cpp:8:7: note: candidate: constexpr B::B(B&&)
prog.cpp:20:12: error: call of overloaded ‘B(const A&)’ is ambiguous
     B b1(ac);
            ^
prog.cpp:12:5: note: candidate: B::B(A)
     B(A a){ printf("A\n");}
     ^
prog.cpp:11:5: note: candidate: B::B(const A&)
     B(const A &a) { printf("const A&\n");}
     ^
prog.cpp:8:7: note: candidate: constexpr B::B(const B&)
 class B
       ^
prog.cpp:8:7: note: candidate: constexpr B::B(B&&)

Standard output is empty