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class A
{
}
 
class B
{
    B(A& a): 
        m_a(a)
        { //Empty }
 
    A& m_a;
}
 
class C :
    public A
    public B 
{
    C() : 
      A(),
      B(*this)
      { //Empty }
}
 
int main()
{
 return 0;
}

prog.cpp:3:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:16:5: error: expected ‘{’ before ‘public’
     public B 
     ^
prog.cpp:16:5: error: expected unqualified-id before ‘public’
prog.cpp:27:1: error: expected ‘}’ at end of input
 }
 ^
prog.cpp: In constructor ‘B::B(A&)’:
prog.cpp:8:9: error: class ‘B’ does not have any field named ‘m_a’
         m_a(a)
         ^
prog.cpp:11:8: error: ‘m_a’ declared as reference but not initialized
     A& m_a;
        ^
prog.cpp:11:8: warning: unused variable ‘m_a’ [-Wunused-variable]
prog.cpp: At global scope:
prog.cpp:12:1: error: expected unqualified-id at end of input
 }
 ^

Standard output is empty