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Samuel Krempp
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 Posted: Sun Apr 25, 2004 11:20 pm Post subject: Re: ostrstream with gcc-3.2.2 |
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le Tuesday 23 March 2004 12:44, [email]google (AT) mueller-tolk (DOT) de[/email] écrivit :
| Quote: | Benoît Dejean <bnetNOSPAM (AT) ifrance (DOT) com> wrote in message
news:<pan.2004.03.21.01.05.09.594456 (AT) ifrance (DOT) com>...
#include <sstream
std::ostringsteam *report = 0;
There is no freeze() in ostringstream.
Can you approve the following?
Up to now I reused some ostrstream by doing "seekp(0);",
"rdbuf->freeze(0);" and NO delete[] of the pointer returned by "str()"
With ostringstream I do not need a freeze as std::ostringstream::str()
and std::string take care of the ownership of the buffer. I just say
std::ostringstream::seekp(0) and reuse the stream.
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did you get the behaviour you expected after this seekp ?
calling seekp(0) does not reset the end of buffer pointers, so :
ostringstream oss;
oss << "1234567890";
oss.seekp(0);
oss << "abc";
cout << oss.str();
will output "abc4567890", if not, your stdlib is not standard compliant.
(I did see one stdlib with this behaviour. In fact I find this behaviour
more useful, but it's not standard)
I made my own alternative stringstream class, providing the same as
std::stringstream plus some access to the eback, gptr, egptr (and
equivalent pointers for the put area) just for this reason. I can send you
my file if you want.
Then you can "reuse" the stringstream correctly.
I find it sad that stringstream's interface was designed this way, it's much
less flexible and useful than it could with almost the same design and
ease-of-use.
--
Samuel.Krempp
cout << "@" << "crans." << (is_spam ? "trucs.en.trop." : "" )
<< "ens-cachan.fr" << endl;
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