libstdc++-v3/testsuite/27_io/basic_istream/extractors_character/wchar_t/3.cc

   1 // Copyright (C) 2004-2020 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 // 27.6.1.2.3 character extractors
  19
  20 #include <istream>
  21 #include <sstream>
  22 #include <testsuite_hooks.h>
  23
  24 void test01()
  25 {
  26   std::wstring str_01;
  27   const std::wstring str_02(L"coltrane playing 'softly as a morning sunrise'");
  28   const std::wstring str_03(L"coltrane");
  29
  30   std::wstringbuf isbuf_01(std::ios_base::in);
  31   std::wstringbuf isbuf_02(str_02, std::ios_base::in);
  32   std::wistream is_01(0);
  33   std::wistream is_02(&isbuf_02);
  34
  35   std::ios_base::iostate state1, state2, statefail;
  36   statefail = std::ios_base::failbit;
  37
  38   // template<_CharT, _Traits>
  39   //  basic_istream& operator>>(istream&, _CharT*)
  40   int n = 20;
  41   wchar_t array1[n];
  42   typedef std::wios::traits_type ctraits_type;
  43
  44   // testing with width() control enabled.
  45   is_02.width(8);
  46   state1 = is_02.rdstate();
  47   is_02 >> array1;   // should snake L"coltran"
  48   state2 = is_02.rdstate();
  49   VERIFY( state1 == state2 );
  50   VERIFY( !ctraits_type::compare(array1, L"coltran", 7) );
  51
  52   is_02.width(1);
  53   state1 = is_02.rdstate();
  54   is_02 >> array1;   // should snake nothing, set failbit
  55   state2 = is_02.rdstate();
  56   VERIFY( state1 != state2 );
  57   VERIFY( state2 == statefail );
  58   VERIFY( array1[0] == L'\0' );
  59
  60   is_02.width(8);
  61   is_02.clear();
  62   state1 = is_02.rdstate();
  63   VERIFY( !state1 );
  64   is_02 >> array1;   // should snake L"e"
  65   state2 = is_02.rdstate();
  66   VERIFY( state1 == state2 );
  67   VERIFY( !ctraits_type::compare(array1, L"e", 1) );
  68
  69   // testing for correct exception setting
  70   const std::wstring str_04(L"   impulse!!");
  71   std::wstringbuf isbuf_03(str_04, std::ios_base::in);
  72   std::wstringbuf isbuf_04(str_04, std::ios_base::in);
  73   std::wistream is_03(&isbuf_03);
  74   std::wistream is_04(&isbuf_04);
  75
  76   is_03 >> array1;
  77   VERIFY( !ctraits_type::compare(array1, L"impulse!!", 10) );
  78   VERIFY( is_03.rdstate() == std::ios_base::eofbit );
  79
  80   is_04.width(9);
  81   is_04 >> array1;
  82   VERIFY( !ctraits_type::compare(array1, L"impulse!", 9) );
  83   VERIFY( !is_04.rdstate() );
  84 }
  85
  86 int main()
  87 {
  88   test01();
  89   return 0;
  90 }