Examples of errors detected by the V702 diagnostic

V702. Classes should always be derived from std::exception (and alike) as 'public'.

Windows Calculator

V702 Classes should always be derived from std::exception (and alike) as 'public' (no keyword was specified, so compiler defaults it to 'private'). CalcManager CalcException.h 4

class CalcException : std::exception
{
public:
  CalcException(HRESULT hr)
  {
    m_hr = hr;
  }
  HRESULT GetException()
  {
    return m_hr;
  }
private:
  HRESULT m_hr;
};

Celestia

V702 Classes should always be derived from std::exception (and alike) as 'public' (no keyword was specified, so compiler defaults it to 'private'). fs.h 21

class filesystem_error : std::system_error
{
public:
  filesystem_error(std::error_code ec, const char* msg) :
    std::system_error(ec, msg)
  {
  }
}; // filesystem_error