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To: cygwin AT cygwin DOT com
Subject: Re: stringstream vs. strstream
References: <8AC36D3167EED41184C800508BD9540502CF5D03 AT apollo DOT adtech-inc DOT com>
From: dmkarr AT earthlink DOT net (David M. Karr)
Date: 29 Jan 2002 09:43:54 -0800
In-Reply-To: <8AC36D3167EED41184C800508BD9540502CF5D03@apollo.adtech-inc.com>
Message-ID: <868zahuk6d.fsf@earthlink.net>
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>>>>> "Jimen" == Jimen Ching <Ching> writes:

    Jimen> Hi all,
    Jimen> Given this source code:
    Jimen> ----------------------------------------------------------------------
    Jimen> #include <iostream>
    Jimen> #include <sstream>
    Jimen> #include <strstream>
    Jimen> #include <string>

    Jimen> int
    Jimen> main()
    Jimen> 	{
    Jimen> 	stringstream s1;
    Jimen> 	strstream s2;
    Jimen> 	string s, fmt("string");

    Jimen> 	s1 << fmt[2];
    Jimen> 	s1 << ends;
    Jimen> 	s = s1.str();
    Jimen> 	cout << "s1: " << s << endl;
    Jimen> 	cout << "s1 size: " << s.size() << endl;

    Jimen> 	s2 << fmt[1];
    Jimen> 	s2 << ends;
    Jimen> 	s = s2.str();
    Jimen> 	cout << "s2: " << s << endl;
    Jimen> 	cout << "s2 size: " << s.size() << endl;

    Jimen> 	return 0;
    Jimen> 	}
    Jimen> ----------------------------------------------------------------

    Jimen> The following output is generated:
    Jimen> $ uname -a
    Jimen> CYGWIN_NT-4.0 A19990524 1.3.9(0.51/3/2) 2002-01-21 12:48 i686 unknown
    Jimen> $ g++ -v
    Jimen> Reading specs from /bin/../lib/gcc-lib/i686-pc-cygwin/2.95.3-5/specs
    Jimen> gcc version 2.95.3-5 (cygwin special)
    Jimen> $ g++ tst.cc
    Jimen> $ ./a.exe
    Jimen> s1: r^@
    Jimen> s1 size: 2
    Jimen> s2: t
    Jimen> s2 size: 1

    Jimen> Note, the shell used is bash.  So the '^@' is what is printed on the
    Jimen> console.

    Jimen> My question is, why is stringstream and strstream behaving differently?
    Jimen> I think stringstream should behave like strstream.  Comments?

They behave differently because they are different.  The newer "stringstream"
class provides the capability to directly insert null characters, which the
"ends" manipulator does.  When you use "stringstream", don't use "ends" to
null-terminate a string.  It's not necessary.

-- 
===================================================================
David M. Karr          ; Java/J2EE/XML/Unix/C++
dmkarr AT earthlink DOT net


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