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- Path: engnews1.Eng.Sun.COM!taumet!clamage
- From: tottinge@csci.csc.com (Tim Ottinger)
- Newsgroups: comp.std.c++
- Subject: OSTRSTREAM and sizing
- Date: 23 Feb 1996 23:27:35 GMT
- Organization: CSC CIS - TRIS DIVISION
- Approved: clamage@eng.sun.com (comp.std.c++)
- Message-ID: <4glcfq$sfr@venus.roc.csci.csc.com>
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- Content-Type: text
- Summary: How to determine size of strbuffer?
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- Originator: clamage@taumet
-
- Hi.
-
- This might be a silly question, but a coworker of mine noticed this, and we've
- tested it on two compilers with similar results:
-
- #include <iostream.h>
- #include <strstream.h>
- int main (char * argc, char * argv[])
- {
- ostrstream str("abcdefg", 4);
-
- cout << "Length = " << str.pcount() << endl;
- cout << "Data = " << str.str();
- }
-
- produces the following output on both the GNU and HP C++ compilers
- Length = 0
- Data = abcdefg
-
- Two things were puzzling about this.
-
- The first was that the length parameter on the c'tor didn't seem
- to be used for anything, and the second was that I couldn't spot the
- right way to tell how big the buffer in the strstreambuf is (how many
- actual characters are in it).
-
- It seems that "data" should have returned either "abcd", or "",
- rather than "abcdefg". This tossed me.
-
- My friend expected the 'pcount()' to tell him how many bytes are in
- the buffer.
-
- I can see some of this for istream(), though much still eludes. For
- an ostream, this is somewhat maddening.
-
- Is is standard, and does it make sense?
-
- ******************************************************************************
- * Tim Ottinger, Sr Tech tottinge@csci.csc.com *
- * CSC Communications Industry Services 217-351-8508x2420 *
- * TRIS Division -- Cellular Billing and Support Fax 217-351-2640 *
- ******************************************************************************
- * Requirements have always been the least stable part of any project I have *
- * worked upon. -- Robert Martin via Usenet 12/02/95 *
- ******************************************************************************
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