libstdc++-v3/testsuite/27_io/basic_fstream/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 // 27.9.1.16 Assign and swap [fstream.assign]
  22
  23 #include <fstream>
  24 #include <string>
  25 #include <testsuite_hooks.h>
  26
  27 using namespace std;
  28
  29 string const name = "fstream-assign.txt";
  30
  31 void
  32 test01()
  33 {
  34   string orig = "Let the whole outside world consist of a long paper tape.";
  35   {
  36     fstream f(name, ios::in|ios::out|ios::trunc);
  37     VERIFY( f.is_open() );
  38     f << orig;
  39     fstream f1;
  40     f1 = std::move(f);
  41     VERIFY( f1.is_open() );
  42     VERIFY( !f.is_open() );
  43     f1.seekg(0);
  44     string result;
  45     getline(f1, result);
  46     VERIFY( result == orig );
  47   }
  48   {
  49     fstream f(name, ios::in);
  50     VERIFY( f.is_open() );
  51     fstream f1;
  52     f1.swap(f);
  53     VERIFY( f1.is_open() );
  54     VERIFY( !f.is_open() );
  55     string result;
  56     getline(f1, result);
  57     VERIFY( result == orig );
  58   }
  59   {
  60     fstream f(name, ios::in);
  61     VERIFY( f.is_open() );
  62     fstream f1;
  63     swap(f1, f);
  64     VERIFY( f1.is_open() );
  65     VERIFY( !f.is_open() );
  66     string result;
  67     getline(f1, result);
  68     VERIFY( result == orig );
  69   }
  70 }
  71
  72 void
  73 test02()
  74 {
  75 #ifdef _GLIBCXX_USE_WCHAR_T
  76   wfstream f, f2;
  77   f2 = std::move(f);
  78   f2.swap(f);
  79   swap(f2, f);
  80 #endif
  81 }
  82
  83 int
  84 main()
  85 {
  86   test01();
  87   test02();
  88 }