GNU Info

(iostream-295.info)Ios

---

Next: Ostream Up: Streams

---

Enter node , (file) or (file)node

Shared properties: class `ios'
==============================

   The base class `ios' provides methods to test and manage the state
of input or output streams.

   `ios' delegates the job of actually reading and writing bytes to the
abstract class `streambuf', which is designed to provide buffered
streams (compatible with C, in the GNU implementation).  Note: Using
the `streambuf' layer, for information on the facilities
available at the `streambuf' level.

 - Constructor:  ios::ios ([streambuf* SB [, ostream* TIE])
     The `ios' constructor by default initializes a new `ios', and if
     you supply a `streambuf' SB to associate with it, sets the state
     `good' in the new `ios' object.  It also sets the default
     properties of the new object.

     You can also supply an optional second argument TIE to the
     constructor: if present, it is an initial value for `ios::tie', to
     associate the new `ios' object with another stream.

 - Destructor:  ios::~ios ()
     The `ios' destructor is virtual, permitting application-specific
     behavior when a stream is closed--typically, the destructor frees
     any storage associated with the stream and releases any other
     associated objects.

States

Checking the state of a stream.

Format Control

Choices in formatting.

Manipulators

Convenient ways of changing stream properties.

Extending

Extended data fields.

Synchronization

Synchronizing related streams.

Streambuf from Ios

Reaching the underlying streambuf.