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

   1 // 1999-07-26 bkoz
   2
   3 // Copyright (C) 1999-2019 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.6.1.2.3 character extractors
  21
  22 #include <istream>
  23 #include <sstream>
  24 #include <testsuite_hooks.h>
  25
  26 void test01()
  27 {
  28   std::string str_01;
  29   const std::string str_02("coltrane playing 'softly as a morning sunrise'");
  30   const std::string str_03("coltrane");
  31
  32   std::stringbuf isbuf_01(std::ios_base::in);
  33   std::stringbuf isbuf_02(str_02, std::ios_base::in);
  34   std::istream is_01(0);
  35   std::istream is_02(&isbuf_02);
  36
  37   std::ios_base::iostate state1, state2, statefail;
  38   statefail = std::ios_base::failbit;
  39
  40   // template<_CharT, _Traits>
  41   //  basic_istream& operator>>(istream&, _CharT*)
  42   int n = 20;
  43   char array1[n];
  44   typedef std::ios::traits_type ctraits_type;
  45
  46   // testing with width() control enabled.
  47   is_02.width(8);
  48   state1 = is_02.rdstate();
  49   is_02 >> array1;   // should snake "coltran"
  50   state2 = is_02.rdstate();
  51   VERIFY( state1 == state2 );
  52   VERIFY( !ctraits_type::compare(array1, "coltran", 7) );
  53
  54   is_02.width(1);
  55   state1 = is_02.rdstate();
  56   is_02 >> array1;   // should snake nothing, set failbit
  57   state2 = is_02.rdstate();
  58   VERIFY( state1 != state2 );
  59   VERIFY( state2 == statefail );
  60   VERIFY( array1[0] == '\0' );
  61
  62   is_02.width(8);
  63   is_02.clear();
  64   state1 = is_02.rdstate();
  65   VERIFY( !state1 );
  66   is_02 >> array1;   // should snake "e"
  67   state2 = is_02.rdstate();
  68   VERIFY( state1 == state2 );
  69   VERIFY( !ctraits_type::compare(array1, "e", 1) );
  70
  71   // testing for correct exception setting
  72   const std::string str_04("   impulse!!");
  73   std::stringbuf isbuf_03(str_04, std::ios_base::in);
  74   std::stringbuf isbuf_04(str_04, std::ios_base::in);
  75   std::istream is_03(&isbuf_03);
  76   std::istream is_04(&isbuf_04);
  77
  78   is_03 >> array1;
  79   VERIFY( !ctraits_type::compare(array1,"impulse!!", 10) );
  80   VERIFY( is_03.rdstate() == std::ios_base::eofbit );
  81
  82   is_04.width(9);
  83   is_04 >> array1;
  84   VERIFY( ! std::ios::traits_type::compare(array1,"impulse!", 9) );
  85   VERIFY( !is_04.rdstate() );
  86 }
  87
  88 int main()
  89 {
  90   test01();
  91   return 0;
  92 }