ostream_proxy.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 
 
#ifndef LIBMESH_OSTREAM_PROXY_H
#define LIBMESH_OSTREAM_PROXY_H
 
 
 
// C++ includes
#include <iostream>
 
namespace libMesh
{
 
template <typename charT=char, typename traits=std::char_traits<charT>>
class BasicOStreamProxy
{
public:
  typedef std::basic_ostream<charT,traits> streamT;
 
  typedef std::basic_streambuf<charT,traits> streambufT;
 
  BasicOStreamProxy (streamT & target) : _target(&target) {}
 
  BasicOStreamProxy (BasicOStreamProxy & old) : _target(old._target) {}
 
  BasicOStreamProxy & operator= (streamT & target)
  {
    _target = &target;
    return *this;
  }
 
  BasicOStreamProxy & operator= (const BasicOStreamProxy & old)
  {
    _target = old._target;
    return *this;
  }
 
  ~BasicOStreamProxy () = default;
 
  //
  // Functions that get passed to the proxied target:
  //
 
  operator streamT & () { return *_target; }
 
  operator const streamT &() const { return *_target; }
 
  template<typename T>
  BasicOStreamProxy & operator<< (const T & in)
  {
    (*_target) << in; return *this;
  }
 
  BasicOStreamProxy & operator<< (streamT & (*in)(streamT &))
  {
    (*_target) << in; return *this;
  }
 
  BasicOStreamProxy & operator<< (std::basic_ios<charT,traits> & (*in)(std::basic_ios<charT,traits> &))
  {
    (*_target) << in; return *this;
  }
 
  BasicOStreamProxy & operator<< (std::ios_base & (*in)(std::ios_base &))
  {
    (*_target) << in; return *this;
  }
 
  streambufT * rdbuf () const { return _target->rdbuf(); }
 
  streambufT * rdbuf ( streambufT * sb ) { return _target->rdbuf(sb); }
 
  BasicOStreamProxy & flush () { _target->flush(); return *this; }
 
  std::ios_base::fmtflags flags ( ) const
  { return _target->flags(); }
 
  std::ios_base::fmtflags flags ( std::ios_base::fmtflags fmtfl )
  { return _target->flags(fmtfl); }
 
  std::ios_base::fmtflags setf ( std::ios_base::fmtflags fmtfl )
  { return _target->setf(fmtfl); }
 
  std::ios_base::fmtflags setf ( std::ios_base::fmtflags fmtfl,
                                 std::ios_base::fmtflags mask )
  { return _target->setf(fmtfl, mask); }
 
  void unsetf ( std::ios_base::fmtflags mask )
  { _target->unsetf(mask); }
 
  std::streamsize precision () const
  { return _target->precision(); }
 
  std::streamsize precision ( std::streamsize prec )
  { return _target->precision(prec); }
 
  //
  // Functions that affect the Proxy class:
  //
 
  void reset (streamT & target) { _target = &target; }
 
  streamT * get()
  {
    return _target;
  }
 
  const streamT * get() const
  {
    return _target;
  }
 
  std::streampos tellp() { return _target->tellp(); }
 
private:
  streamT * _target;
};
 
typedef BasicOStreamProxy<> OStreamProxy;
 
} // namespace libMesh
 
#endif // LIBMESH_OSTREAM_PROXY_H