class failure;

Base class for stream exceptions

This embedded class is derived from the standard exception class and serves as a base class for objects thrown as exceptions by member functions in the iostream hierarchy of classes.

It is defined (within the std namespace) as:

class ios_base::failure : public exception {
public:
  explicit failure (const string& msg);
  virtual ~failure();
  virtual const char* what() const throw();
}

Members

explicit failure (const string& msg); (constructor)

The value of string received as the msg parameter is internally stored and its C-string equivalent is returned by subsequent calls to what.
It effectively calls its parent class' constructor (exception::exception).

virtual ~failure(); (destructor)

No operation.

virtual const char* what() const;

Returns the C-string value equivalent to the msg argument used on its construction.