libstdc++-v3/testsuite/27_io/basic_istream/extractors_character/wchar_t/1.cc

   1 // Copyright (C) 2004-2024 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   const int n = 20;
  41   wchar_t array1[n];
  42   array1[0] = L'\0';
  43   typedef std::wios::traits_type ctraits_type;
  44   ctraits_type::int_type i1, i2;
  45
  46   state1 = is_01.rdstate();
  47   i1 = ctraits_type::length(array1);
  48   is_01 >> array1;   // should snake 0 characters, not alter stream state
  49   i2 = ctraits_type::length(array1);
  50   state2 = is_01.rdstate();
  51   VERIFY( i1 == i2 );
  52   VERIFY( state1 != state2 );
  53   VERIFY( static_cast<bool>(state2 & statefail) );
  54
  55   state1 = is_02.rdstate();
  56   is_02 >> array1;   // should snake L"coltrane"
  57   state2 = is_02.rdstate();
  58   VERIFY( state1 == state2 );
  59   VERIFY( !static_cast<bool>(state2 & statefail) );
  60   VERIFY( array1[str_03.size() - 1] == L'e' );
  61   array1[str_03.size()] = L'\0';
  62   VERIFY( !str_03.compare(0, str_03.size(), array1) );
  63   std::wistream::int_type int1 = is_02.peek(); // should be L' '
  64   VERIFY( int1 == L' ' );
  65
  66   state1 = is_02.rdstate();
  67   is_02 >> array1;   // should snake L"playing" as sentry "eats" ws
  68   state2 = is_02.rdstate();
  69   int1 = is_02.peek(); // should be L' '
  70   VERIFY( int1 == L' ' );
  71   VERIFY( state1 == state2 );
  72   VERIFY( !static_cast<bool>(state2 & statefail) );
  73 }
  74
  75 int main()
  76 {
  77   test01();
  78   return 0;
  79 }