Re: [Boost-users] newbie - boost::shared_ptr of type stringstreamusing << operator?

From: Andrew McDonald (andrew.mcdonald_at_[hidden])
Date: 2006-05-15 23:28:18

The stringstream (or ostringstream) 

stringstream ss("Hello", ios_base::out);

will create a stringstream with the output sequence initialised to "Hello" and the position set to the _beginning_ of the sequence.
Thus any insertions will overwrite the value from the initialiser string. 

There were various issues and debates after the 1998 standard came out [Issues 432 and Issue 45 (closed)]..and it is a little unclear to me what the resolution was...but I _think_ the following is correct...

- The standard does not mandate that ostringstream (more precisely the underlying stringbuf) supports ios_base::ate.
- However, many implementations do support it.

As an arbitrary test, compiling with Visual Express 2005 and using ios_base::ate, I find that this does move the position to the end of the sequence.

Note that stringstreams must support explicitly seeking to the end of the sequence;
e.g.

ostringstream oss("Hello");
oss.seekp(o, ios_base::end);
oss << " world";

regards,

Andrew McDonald
System Architect

Norwood Systems Australia Pty Ltd
Level 1, 71 Troy Terrace
PO Box 1281
Subiaco, WA 6904

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