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#ifndef _theplu_yat_utility_stream_readirect_ |
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#define _theplu_yat_utility_stream_readirect_ |
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// $Id$ |
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/* |
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Copyright (C) 2009 Peter Johansson |
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This file is part of the yat library, http://dev.thep.lu.se/yat |
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|
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The yat library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License as |
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published by the Free Software Foundation; either version 3 of the |
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License, or (at your option) any later version. |
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The yat library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with yat. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include <fstream> |
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#include <istream> |
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#include <ostream> |
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#include <streambuf> |
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#include <string> |
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|
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namespace theplu { |
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namespace yat { |
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namespace utility { |
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|
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/** |
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\brief Redirect a stream to another stream. |
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|
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This class can be used to redirect a stream so it uses the buffer |
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of another stream. This another stream is either a stream |
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provided by the caller or if the caller provide a string the an |
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internal fstream is created. In the destructor the stream is |
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restored to use its own buffer. See documentation of CommandLine |
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for an example of usage. |
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|
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\note It is important that an instance of this class is |
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deallocated before the stream it holds (see |
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BasicStreamRedirect::~BasicStreamRedirect). |
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|
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\see StreamRedirect and wStreamRedirect |
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|
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\since New in yat 0.6 |
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*/ |
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template<class charT, class traits = std::char_traits<charT> > |
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class BasicStreamRedirect |
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{ |
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public: |
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/** |
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\brief redirect istream to another istream |
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|
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\a is1 is redirected to get its input from the buffer of \a is2 |
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(rather than its own buffer). A reference to \a is1 and its |
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buffer is stored, so \a is1 can be restored in the destructor. |
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63 |
|
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If \a active is false, the class does nothing. |
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*/ |
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BasicStreamRedirect(std::basic_istream<charT, traits>& is1, |
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std::basic_istream<charT, traits>& is2, |
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bool active=true); |
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|
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/** |
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\brief redirect istream to ifstream. |
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|
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An ifstream with path \a file is created, and \a is is |
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redirected to get its input from the buffer of this ifstream. |
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|
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If \a active is false, the class does nothing. |
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*/ |
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BasicStreamRedirect(std::basic_istream<charT, traits>& is, |
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const std::string& file, bool active=true); |
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|
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/** |
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\brief redirect ostream to another ostream |
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|
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\a os1 is redirected to send its output to the buffer of \a os2 |
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(rather than its own buffer). A reference to \a os1 and its |
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buffer is stored, so \a os1 can be restored in the destructor. |
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|
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If \a active is false, the class does nothing. |
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*/ |
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BasicStreamRedirect(std::basic_ostream<charT, traits>& os1, |
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std::basic_ostream<charT, traits>& os2, |
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bool active=true); |
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/** |
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\brief redirect ostream to ofstream. |
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|
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An ofstream with path \a file is created, and \a os is |
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redirected to send its output to the buffer of this ofstream. |
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If \a active is false, the class does nothing. |
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*/ |
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BasicStreamRedirect(std::basic_ostream<charT, traits>& os, |
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const std::string& file, bool active=true); |
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|
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/** |
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\brief Destructor - resets the redirect |
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|
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The stream (first argument in constructor) is restored to use |
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its original buffer. |
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\note It is important that the stream held is not deallocated |
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before this object is destroyed. There are two reasons for |
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this: 1) The behavior of this destructor is undefined. 2) The |
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stream destroys the streambuf in its destructor, so if the |
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stream is destroyed before it is restored, the streambuf will |
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likely be deallocated twice. In addition, the original |
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streambuf of the stream will not be closed and deallocated; |
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hence a memory and resource leak. |
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*/ |
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~BasicStreamRedirect(void); |
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private: |
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// no copying |
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BasicStreamRedirect(const BasicStreamRedirect&); |
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BasicStreamRedirect& operator=(const BasicStreamRedirect&); |
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|
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void init(std::basic_ios<charT, traits>& ios1, |
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std::basic_ios<charT, traits>& ios2, |
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bool active); |
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|
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std::basic_streambuf<charT, traits>* buf_; |
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std::basic_ifstream<charT, traits>* ifs_; |
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std::basic_ios<charT, traits>* ios_; |
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std::basic_ofstream<charT, traits>* ofs_; |
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}; |
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/** |
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\since New in yat 0.6 |
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*/ |
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typedef BasicStreamRedirect<char> StreamRedirect; |
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/** |
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\since New in yat 0.6 |
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*/ |
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typedef BasicStreamRedirect<wchar_t> wStreamRedirect; |
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|
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// template implementations |
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template<class charT, class traits> |
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BasicStreamRedirect<charT, traits>:: |
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BasicStreamRedirect(std::basic_istream<charT, traits>& is1, |
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std::basic_istream<charT, traits>& is2, bool active) |
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: buf_(NULL), ifs_(NULL), ios_(NULL), ofs_(NULL) |
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{ |
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init(is1, is2, active); |
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} |
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template<class charT, class traits> |
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BasicStreamRedirect<charT, traits>:: |
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BasicStreamRedirect(std::basic_istream<charT, traits>& is, |
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const std::string& file, bool active) |
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: buf_(NULL), ifs_(NULL), ios_(NULL), ofs_(NULL) |
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{ |
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if (active) { |
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ifs_ = new std::basic_ifstream<charT, traits>(file.c_str()); |
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init(is, *ofs_, active); |
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} |
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} |
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|
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|
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template<class charT, class traits> |
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BasicStreamRedirect<charT, traits>:: |
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BasicStreamRedirect(std::basic_ostream<charT, traits>& os1, |
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std::basic_ostream<charT, traits>& os2, bool active) |
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: buf_(NULL), ifs_(NULL), ios_(NULL), ofs_(NULL) |
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{ |
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init(os1, os2, active); |
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} |
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|
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template<class charT, class traits> |
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BasicStreamRedirect<charT, traits>:: |
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BasicStreamRedirect(std::basic_ostream<charT, traits>& os, |
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const std::string& file, bool active) |
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: buf_(NULL), ifs_(NULL), ios_(NULL), ofs_(NULL) |
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{ |
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if (active) { |
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ofs_ = new std::basic_ofstream<charT, traits>(file.c_str()); |
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init(os, *ofs_, active); |
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} |
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} |
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|
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template<class charT, class traits> |
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BasicStreamRedirect<charT, traits>:: |
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~BasicStreamRedirect(void) |
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{ |
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// only restore stream if active is true |
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if (ios_) { |
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ios_->rdbuf(buf_); |
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} |
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delete ifs_; |
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delete ofs_; |
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} |
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template<class charT, class traits> |
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void |
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BasicStreamRedirect<charT, traits>::init(std::basic_ios<charT, traits>& s1, |
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std::basic_ios<charT, traits>& s2, |
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bool active) |
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{ |
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if (active) { |
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ios_ = &s1; |
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// save the buffer |
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buf_ = s1.rdbuf(); |
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// redirect os1 to os2 |
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s1.rdbuf(s2.rdbuf()); |
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} |
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} |
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|
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}}} // of namespace utility, yat, and theplu |
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|
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#endif |