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class CL1 { public: CL1(int) {} };
class CL2 : private virtual CL1{ public: CL2() : CL1(42) {} };
class CL3 : private virtual CL1{ public: CL3() : CL1(42) {} };
 
class CL4 : public CL2, public CL3
{
public:
    CL4() : CL2(), CL3(){}
};
 
int main()
{
    CL4 cl4;
    return 0;
}
 

prog.cpp: In constructor ‘CL4::CL4()’:
prog.cpp:8:24: error: no matching function for call to ‘CL1::CL1()’
     CL4() : CL2(), CL3(){}
                        ^
prog.cpp:8:24: note: candidates are:
prog.cpp:1:21: note: CL1::CL1(int)
 class CL1 { public: CL1(int) {} };
                     ^
prog.cpp:1:21: note:   candidate expects 1 argument, 0 provided
prog.cpp:1:7: note: CL1::CL1(const CL1&)
 class CL1 { public: CL1(int) {} };
       ^
prog.cpp:1:7: note:   candidate expects 1 argument, 0 provided

Standard output is empty