94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/***************************************************************************
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*
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* strstreambuf.cpp - strstreambuf example.
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*
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* $Id: strstreambuf.cpp 587173 2007-10-22 17:55:02Z faridz $
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*
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***************************************************************************
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*
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* Copyright 1994-2006 Rogue Wave Software.
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*
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**************************************************************************/
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#include <iomanip> // for setw
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#include <ios> // for dec, ends
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#include <iostream> // for cerr, cout
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#include <strstream> // for istream, ostrstream
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#include <examples.h>
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int main ()
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{
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// create a write-only stream object
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std::ostrstream out;
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// tie the istream object to the ostrstream object
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std::istream in (out.rdbuf ());
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// output to out
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out << "Anticonstitutionnellement is a big word!!!\n";
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// create a NTBS
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const char s[] ="Le rat des villes et le rat des champs.";
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// output the NTBS
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out << s << '\n';
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// (try to) resize the buffer
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if (out.rdbuf ()->pubsetbuf (0, 128L))
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std::cout << "Successfully allocated buffer.\n";
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else
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std::cerr << "Failed to allocate buffer.\n";
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// output the contents of the buffer to standard output
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std::cout << in.rdbuf ();
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// format a number into out
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out << std::dec // decimal base
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<< std::setfill ('#') // set fill character
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<< std::setw (16) // set field width
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<< 0x100 << '\n'; // format
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// output the content of the input sequence to standard output
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std::cout << in.rdbuf( ) << '\n';
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// number of elements in the output sequence
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const std::streamsize pcount = std::streamsize (out.rdbuf ()->pcount ());
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std::cout << "Buffer size is " << pcount << '\n';
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// (try to) resize the buffer
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if (out.rdbuf ()->pubsetbuf (0, pcount * 2L))
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std::cout << "\nSuccessfully resized buffer to " << pcount * 2 << '\n';
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else
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std::cerr << "\nFailed to resize buffer to " << pcount * 2 << '\n';
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// NUL-terminate the character array before streaming it out
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out << std::ends;
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// output the contents of the streambuf object associated with out
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std::cout << out.rdbuf ()->str ();
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// unfreeze the streambuf so it cleans up its allocated memory
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out.rdbuf ()->freeze (false);
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return 0;
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}
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