RWvios

Module:  Essential Tools Module   Group:  Virtual Stream Classes

Does not inherit

• Local Index
• Synopsis
• Description
• Persistence
• Public Member Functions

Members

bad() clear()

eof() fail()

good() operator void*()

rdstate()

#include <vstream.h>
(abstract base class)

RWvios is an abstract base class. It defines an interface similar to the C++ streams class std::ios. However, unlike ios, it offers the advantage of not necessarily being associated with a std::streambuf.

This is useful for classes that cannot use a std::streambuf in their implementation. An example of such a class is RWXDRistream, where the XDR model does not permit streambuf functionality.

Specializing classes that do use std::streambufs in their implementation (such as RWpistream) can usually just return the corresponding std::ios function.

None

virtual int
eof() = 0;

Returns a nonzero integer if an EOF has been encountered.

virtual int
fail() = 0; 

Returns a nonzero integer if the fail or bad bit has been set. Normally, this indicates that some storage or retrieval has failed but that the stream is still in a usable state.

virtual int
bad() = 0; 

Returns a nonzero integer if the bad bit has been set. Normally this indicates that a severe error has occurred from which recovery is probably impossible.

virtual int
good() = 0; 

Returns a nonzero integer if no error bits have been set.

virtual int
rdstate() = 0; 

Returns the current error state.

virtual void
clear(int v=0) = 0; 

Sets the current error state to v. If v is zero, then this clears the error state.

operator void*();

If fail() then return 0 else return self.

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