ios-savepoint.hpp

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/*
  IOS-SAVEPOINT.hpp  -  capture and restore std::ostream format settings
 
   Copyright (C)
     2022,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
 Free Software Foundation; either version 2 of the License, or (at your
 option) any later version. See the file COPYING for further details.
 
*/
 
 
#ifndef LIB_IOS_SAVEPOINT_H
#define LIB_IOS_SAVEPOINT_H
 
#include "lib/nocopy.hpp"
 
#include <ostream>
 
 
 
namespace util {
  
  class IosSavepoint
    : MoveOnly
    {
      std::ostream& theStream_;
      std::ios_base::fmtflags prevFlags_;
      char fillChar_;
      
    public:
      explicit
      IosSavepoint(std::ostream& stream_to_capture)
        : theStream_{stream_to_capture}
        , prevFlags_{theStream_.flags()}
        , fillChar_{theStream_.fill()}
      { }
      
     ~IosSavepoint()
        {
          theStream_.flags(prevFlags_);
          theStream_.fill(fillChar_);
        }
    };
  
  
} // namespace util
#endif /*LIB_IOS_SAVEPOINT_H*/