libstdc++-v3/testsuite/27_io/basic_ifstream/assign/1.cc

   1 // Copyright (C) 2014-2023 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++11 } }
  19 // { dg-require-fileio "" }
  20
  21 // 27.9.1.8 Assign and swap [ifstream.assign]
  22
  23 #include <fstream>
  24 #include <sstream>
  25 #include <testsuite_hooks.h>
  26
  27 void
  28 read(std::istream& in, std::ostream& out)
  29 {
  30   std::string s;
  31   for (int i=0; i < 10; ++i)
  32   {
  33     getline(in, s);
  34     out << s << '\n';
  35   }
  36 }
  37
  38 void
  39 test01()
  40 {
  41   std::string const name = "thirty_years_among_the_dead_preproc.txt";
  42   std::ostringstream ss0;
  43   {
  44     std::ifstream f0(name);
  45     read(f0, ss0);
  46   }
  47   {
  48     std::ifstream f0(name);
  49     std::ifstream f1;
  50     f1 = std::move(f0);
  51     VERIFY( !f0.is_open() );
  52     VERIFY( f1.is_open() );
  53     std::ostringstream ss1;
  54     read(f1, ss1);
  55     VERIFY( ss0.str() == ss1.str() );
  56   }
  57   {
  58     std::ifstream f0(name);
  59     std::ifstream f1;
  60     f1.swap(f0);
  61     VERIFY( !f0.is_open() );
  62     VERIFY( f1.is_open() );
  63     std::ostringstream ss1;
  64     read(f1, ss1);
  65     VERIFY( ss0.str() == ss1.str() );
  66   }
  67 }
  68
  69 void
  70 test02()
  71 {
  72 #ifdef _GLIBCXX_USE_WCHAR_T
  73   std::wifstream f, f2;
  74   f2 = std::move(f);
  75   f2.swap(f);
  76   swap(f2, f);
  77 #endif
  78 }
  79
  80 int
  81 main()
  82 {
  83   test01();
  84   test02();
  85 }