LCOV - code coverage report
Current view: top level - usr/include/c++/6/bits - stream_iterator.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 12 12 100.0 %
Date: 2018-11-14 16:53:58 Functions: 15 60 25.0 %

          Line data    Source code
       1             : // Stream iterators
       2             : 
       3             : // Copyright (C) 2001-2016 Free Software Foundation, Inc.
       4             : //
       5             : // This file is part of the GNU ISO C++ Library.  This library is free
       6             : // software; you can redistribute it and/or modify it under the
       7             : // terms of the GNU General Public License as published by the
       8             : // Free Software Foundation; either version 3, or (at your option)
       9             : // any later version.
      10             : 
      11             : // This library is distributed in the hope that it will be useful,
      12             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             : // GNU General Public License for more details.
      15             : 
      16             : // Under Section 7 of GPL version 3, you are granted additional
      17             : // permissions described in the GCC Runtime Library Exception, version
      18             : // 3.1, as published by the Free Software Foundation.
      19             : 
      20             : // You should have received a copy of the GNU General Public License and
      21             : // a copy of the GCC Runtime Library Exception along with this program;
      22             : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23             : // <http://www.gnu.org/licenses/>.
      24             : 
      25             : /** @file bits/stream_iterator.h
      26             :  *  This is an internal header file, included by other library headers.
      27             :  *  Do not attempt to use it directly. @headername{iterator}
      28             :  */
      29             : 
      30             : #ifndef _STREAM_ITERATOR_H
      31             : #define _STREAM_ITERATOR_H 1
      32             : 
      33             : #pragma GCC system_header
      34             : 
      35             : #include <debug/debug.h>
      36             : 
      37             : namespace std _GLIBCXX_VISIBILITY(default)
      38             : {
      39             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      40             : 
      41             :   /**
      42             :    * @addtogroup iterators
      43             :    * @{
      44             :    */
      45             : 
      46             :   /// Provides input iterator semantics for streams.
      47             :   template<typename _Tp, typename _CharT = char,
      48             :            typename _Traits = char_traits<_CharT>, typename _Dist = ptrdiff_t>
      49             :     class istream_iterator
      50             :     : public iterator<input_iterator_tag, _Tp, _Dist, const _Tp*, const _Tp&>
      51             :     {
      52             :     public:
      53             :       typedef _CharT                         char_type;
      54             :       typedef _Traits                        traits_type;
      55             :       typedef basic_istream<_CharT, _Traits> istream_type;
      56             : 
      57             :     private:
      58             :       istream_type*     _M_stream;
      59             :       _Tp               _M_value;
      60             :       bool              _M_ok;
      61             : 
      62             :     public:
      63             :       ///  Construct end of input stream iterator.
      64             :       _GLIBCXX_CONSTEXPR istream_iterator()
      65             :       : _M_stream(0), _M_value(), _M_ok(false) {}
      66             : 
      67             :       ///  Construct start of input stream iterator.
      68             :       istream_iterator(istream_type& __s)
      69             :       : _M_stream(&__s)
      70             :       { _M_read(); }
      71             : 
      72             :       istream_iterator(const istream_iterator& __obj)
      73             :       : _M_stream(__obj._M_stream), _M_value(__obj._M_value),
      74             :         _M_ok(__obj._M_ok)
      75             :       { }
      76             : 
      77             :       const _Tp&
      78             :       operator*() const
      79             :       {
      80             :         __glibcxx_requires_cond(_M_ok,
      81             :                                 _M_message(__gnu_debug::__msg_deref_istream)
      82             :                                 ._M_iterator(*this));
      83             :         return _M_value;
      84             :       }
      85             : 
      86             :       const _Tp*
      87             :       operator->() const { return &(operator*()); }
      88             : 
      89             :       istream_iterator&
      90             :       operator++()
      91             :       {
      92             :         __glibcxx_requires_cond(_M_ok,
      93             :                                 _M_message(__gnu_debug::__msg_inc_istream)
      94             :                                 ._M_iterator(*this));
      95             :         _M_read();
      96             :         return *this;
      97             :       }
      98             : 
      99             :       istream_iterator
     100             :       operator++(int)
     101             :       {
     102             :         __glibcxx_requires_cond(_M_ok,
     103             :                                 _M_message(__gnu_debug::__msg_inc_istream)
     104             :                                 ._M_iterator(*this));
     105             :         istream_iterator __tmp = *this;
     106             :         _M_read();
     107             :         return __tmp;
     108             :       }
     109             : 
     110             :       bool
     111             :       _M_equal(const istream_iterator& __x) const
     112             :       { return (_M_ok == __x._M_ok) && (!_M_ok || _M_stream == __x._M_stream); }
     113             : 
     114             :     private:
     115             :       void
     116             :       _M_read()
     117             :       {
     118             :         _M_ok = (_M_stream && *_M_stream) ? true : false;
     119             :         if (_M_ok)
     120             :           {
     121             :             *_M_stream >> _M_value;
     122             :             _M_ok = *_M_stream ? true : false;
     123             :           }
     124             :       }
     125             :     };
     126             : 
     127             :   ///  Return true if x and y are both end or not end, or x and y are the same.
     128             :   template<typename _Tp, typename _CharT, typename _Traits, typename _Dist>
     129             :     inline bool
     130             :     operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
     131             :                const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __y)
     132             :     { return __x._M_equal(__y); }
     133             : 
     134             :   ///  Return false if x and y are both end or not end, or x and y are the same.
     135             :   template <class _Tp, class _CharT, class _Traits, class _Dist>
     136             :     inline bool
     137             :     operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
     138             :                const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __y)
     139             :     { return !__x._M_equal(__y); }
     140             : 
     141             :   /**
     142             :    *  @brief  Provides output iterator semantics for streams.
     143             :    *
     144             :    *  This class provides an iterator to write to an ostream.  The type Tp is
     145             :    *  the only type written by this iterator and there must be an
     146             :    *  operator<<(Tp) defined.
     147             :    *
     148             :    *  @tparam  _Tp  The type to write to the ostream.
     149             :    *  @tparam  _CharT  The ostream char_type.
     150             :    *  @tparam  _Traits  The ostream char_traits.
     151             :   */
     152             :   template<typename _Tp, typename _CharT = char,
     153             :            typename _Traits = char_traits<_CharT> >
     154             :     class ostream_iterator
     155             :     : public iterator<output_iterator_tag, void, void, void, void>
     156             :     {
     157             :     public:
     158             :       //@{
     159             :       /// Public typedef
     160             :       typedef _CharT                         char_type;
     161             :       typedef _Traits                        traits_type;
     162             :       typedef basic_ostream<_CharT, _Traits> ostream_type;
     163             :       //@}
     164             : 
     165             :     private:
     166             :       ostream_type*     _M_stream;
     167             :       const _CharT*     _M_string;
     168             : 
     169             :     public:
     170             :       /// Construct from an ostream.
     171             :       ostream_iterator(ostream_type& __s) : _M_stream(&__s), _M_string(0) {}
     172             : 
     173             :       /**
     174             :        *  Construct from an ostream.
     175             :        *
     176             :        *  The delimiter string @a c is written to the stream after every Tp
     177             :        *  written to the stream.  The delimiter is not copied, and thus must
     178             :        *  not be destroyed while this iterator is in use.
     179             :        *
     180             :        *  @param  __s  Underlying ostream to write to.
     181             :        *  @param  __c  CharT delimiter string to insert.
     182             :       */
     183        3105 :       ostream_iterator(ostream_type& __s, const _CharT* __c)
     184        3105 :       : _M_stream(&__s), _M_string(__c)  { }
     185             : 
     186             :       /// Copy constructor.
     187       15525 :       ostream_iterator(const ostream_iterator& __obj)
     188       15525 :       : _M_stream(__obj._M_stream), _M_string(__obj._M_string)  { }
     189             : 
     190             :       /// Writes @a value to underlying ostream using operator<<.  If
     191             :       /// constructed with delimiter string, writes delimiter to ostream.
     192             :       ostream_iterator&
     193        5612 :       operator=(const _Tp& __value)
     194             :       {
     195             :         __glibcxx_requires_cond(_M_stream != 0,
     196             :                                 _M_message(__gnu_debug::__msg_output_ostream)
     197             :                                 ._M_iterator(*this));
     198        5612 :         *_M_stream << __value;
     199        5612 :         if (_M_string) *_M_stream << _M_string;
     200        5612 :         return *this;
     201             :       }
     202             : 
     203             :       ostream_iterator&
     204        5612 :       operator*()
     205        5612 :       { return *this; }
     206             : 
     207             :       ostream_iterator&
     208        5612 :       operator++()
     209        5612 :       { return *this; }
     210             : 
     211             :       ostream_iterator&
     212             :       operator++(int)
     213             :       { return *this; }
     214             :     };
     215             : 
     216             :   // @} group iterators
     217             : 
     218             : _GLIBCXX_END_NAMESPACE_VERSION
     219             : } // namespace
     220             : 
     221             : #endif

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