class AbstractClass
{
public:
  AbstractClass()
  {
    std::wcout << L"AbstractClass::AbstractClass()" << std::endl;
  }
  virtual ~AbstractClass() = 0
  {
    std::wcout << L"AbstractClass::~AbstractClass()" << std::endl;
  }
};

class ConcreteClass : public AbstractClass
{
public:
  ConcreteClass()
  {
    std::wcout << L"ConcreteClass::ConcreteClass()" << std::endl;
  }
  virtual ~ConcreteClass()
  {
    std::wcout << L"ConcreteClass::~ConcreteClass()" << std::endl;
  }
};

class IAlpha
{
public:
  virtual ~IAlpha() = 0 {}
};

class AbstractClass : public IAlpha
{
public:
  AbstractClass()
  {
    std::wcout << L"AbstractClass::AbstractClass()" << std::endl;
  }
  virtual ~AbstractClass() = 0
  {
    std::wcout << L"AbstractClass::~AbstractClass()" << std::endl;
  }
};

class ConcreteClass : public AbstractClass
{
public:
  ConcreteClass()
  {
    std::wcout << L"ConcreteClass::ConcreteClass()" << std::endl;
  }
  virtual ~ConcreteClass()
  {
    std::wcout << L"ConcreteClass::~ConcreteClass()" << std::endl;
  }
};

class IAlpha
{
public:
  virtual ~IAlpha() = 0 {}
};

class AbstractClass : public IAlpha
{
public:
  AbstractClass()
  {
    std::wcout << L"AbstractClass::AbstractClass()" << std::endl;
  }
  virtual ~AbstractClass() = 0
  {
    std::wcout << L"AbstractClass::~AbstractClass()" << std::endl;
  }
};

class ConcreteClass : public AbstractClass
{
public:
  ConcreteClass()
  {
    std::wcout << L"ConcreteClass::ConcreteClass()" << std::endl;
  }
  virtual ~ConcreteClass()
  {
    std::wcout << L"ConcreteClass::~ConcreteClass()" << std::endl;
  }
};

class IAlpha
{
public:
  virtual ~IAlpha() = 0 {}
};

class IBeta
{
public:
  virtual ~IBeta() = 0 {}
};

class AbstractClass : public IAlpha, public IBeta
{
public:
  AbstractClass()
  {
    std::wcout << L"AbstractClass::AbstractClass()" << std::endl;
  }
  virtual ~AbstractClass() = 0
  {
    std::wcout << L"AbstractClass::~AbstractClass()" << std::endl;
  }
};

class ConcreteClass : public AbstractClass
{
public:
  ConcreteClass()
  {
    std::wcout << L"ConcreteClass::ConcreteClass()" << std::endl;
  }
  virtual ~ConcreteClass()
  {
    std::wcout << L"ConcreteClass::~ConcreteClass()" << std::endl;
  }
};

AbstractClass::~AbstractClass()

struct IAlpha {
  virtual ~IAlpha() = 0;
};
inline IAlpha::~IAlpha() {}
// similarly for the rest.