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#include <iostream>
using namespace std;
 
class ITestA
{
public:
    virtual void methodA() = 0;
};
 
class ITestB : public ITestA
{
public:
    virtual void methodB() = 0;
};
 
class CBaseA : public ITestA
{
 
    virtual void methodA() override
    {
 
    }
};
 
class CBaseB : public CBaseA, public ITestB
{
 
    virtual void methodB() override
    {
 
    }
};
 
int main() {
	CBaseB b;
	return 0;
}
 
 

prog.cpp: In function ‘int main()’:
prog.cpp:35:9: error: cannot declare variable ‘b’ to be of abstract type ‘CBaseB’
  CBaseB b;
         ^
prog.cpp:25:7: note:   because the following virtual functions are pure within ‘CBaseB’:
 class CBaseB : public CBaseA, public ITestB
       ^~~~~~
prog.cpp:7:18: note: 	virtual void ITestA::methodA()
     virtual void methodA() = 0;
                  ^~~~~~~

Standard output is empty