The GNU C++ Iostream Library - Ios

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). See 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.