libstdc++-v3/testsuite/27_io/basic_istream/extractors_other/char/1.cc

   1 // 1999-07-28 bkoz
   2
   3 // Copyright (C) 1999-2024 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 basic_istream::operator>>
  21
  22 #include <istream>
  23 #include <sstream>
  24 #include <testsuite_hooks.h>
  25
  26 // stringbufs.
  27 void test01()
  28 {
  29   typedef std::ios::traits_type ctraits_type;
  30
  31   const std::string str_01;
  32   const std::string str_02("art taylor kickin it on DAKAR");
  33   std::string strtmp;
  34
  35   std::stringbuf isbuf_00(std::ios_base::in);
  36   std::stringbuf isbuf_01(std::ios_base::in | std::ios_base::out);
  37   std::stringbuf isbuf_02(str_01, std::ios_base::in);
  38   std::stringbuf isbuf_03(str_01, std::ios_base::in | std::ios_base::out);
  39   std::stringbuf isbuf_04(str_02, std::ios_base::in);
  40   std::stringbuf isbuf_05(str_02, std::ios_base::in | std::ios_base::out);
  41
  42   std::istream is_00(0);
  43   std::istream is_01(&isbuf_01);
  44   std::istream is_02(&isbuf_02);
  45   std::istream is_03(&isbuf_03);
  46   std::istream is_04(&isbuf_04);
  47   std::istream is_05(&isbuf_05);
  48   std::ios_base::iostate state1, state2, statefail, stateeof;
  49   statefail = std::ios_base::failbit;
  50   stateeof = std::ios_base::eofbit;
  51
  52
  53   // template<_CharT, _Traits>
  54   //  basic_istream& operator>>(basic_streambuf*)
  55
  56   // null istream to empty in_buf
  57   state1 = is_00.rdstate();
  58   is_00 >> &isbuf_00;
  59   state2 = is_00.rdstate();
  60   VERIFY( state1 != state2 );
  61   VERIFY( static_cast<bool>(state2 & statefail) );
  62   VERIFY( isbuf_00.str() == str_01 );
  63
  64   // null istream to empty in_out_buf
  65   is_00.clear(std::ios_base::goodbit);
  66   state1 = is_00.rdstate();
  67   is_00 >> &isbuf_01;
  68   state2 = is_00.rdstate();
  69   VERIFY( state1 != state2 );
  70   VERIFY( static_cast<bool>(state2 & statefail) );
  71   VERIFY( isbuf_01.str() == str_01 );
  72
  73   // null istream to full in_buf
  74   is_00.clear(std::ios_base::goodbit);
  75   state1 = is_00.rdstate();
  76   is_00 >> &isbuf_04;
  77   state2 = is_00.rdstate();
  78   VERIFY( state1 != state2 );
  79   VERIFY( static_cast<bool>(state2 & statefail) );
  80   VERIFY( isbuf_04.str() == str_02 );
  81
  82   // null istream to full in_out_buf
  83   is_00.clear(std::ios_base::goodbit);
  84   state1 = is_00.rdstate();
  85   is_00 >> &isbuf_05;
  86   state2 = is_00.rdstate();
  87   VERIFY( state1 != state2 );
  88   VERIFY( static_cast<bool>(state2 & statefail) );
  89   VERIFY( isbuf_05.str() == str_02 );
  90
  91   // empty but non-null istream to full in_buf
  92   state1 = is_02.rdstate();
  93   is_02 >> &isbuf_04;
  94   state2 = is_02.rdstate();
  95   VERIFY( state1 != state2 );
  96   VERIFY( static_cast<bool>(state2 & statefail) );
  97   VERIFY( isbuf_04.str() == str_02 ); // as only an "in" buffer
  98   VERIFY( isbuf_04.sgetc() == 'a' );
  99
 100   // empty but non-null istream to full in_out_buf
 101   is_02.clear(std::ios_base::goodbit);
 102   state1 = is_02.rdstate();
 103   is_02 >> &isbuf_05;
 104   state2 = is_02.rdstate();
 105   VERIFY( state1 != state2 );
 106   VERIFY( static_cast<bool>(state2 & statefail) );
 107   VERIFY( isbuf_05.str() == str_02 ); // as only an "in" buffer
 108   VERIFY( isbuf_05.sgetc() == 'a' );
 109
 110   // full istream to empty in_buf (need out_buf, you know?)
 111   state1 = is_04.rdstate();
 112   is_04 >> &isbuf_02;
 113   state2 = is_04.rdstate();
 114   VERIFY( state1 != state2 );
 115   VERIFY( static_cast<bool>(state2 & statefail) );
 116   VERIFY( isbuf_02.str() == str_01 ); // as only an "in" buffer
 117   VERIFY( isbuf_02.sgetc() == ctraits_type::eof() );
 118   VERIFY( is_04.peek() == ctraits_type::eof() ); // as failed
 119
 120   // full istream to empty in_out_buf
 121   is_04.clear(std::ios_base::goodbit);
 122   state1 = is_04.rdstate();
 123   is_04 >> &isbuf_03;
 124   state2 = is_04.rdstate();
 125   VERIFY( state1 != state2 );
 126   VERIFY( !static_cast<bool>(state2 & statefail) );
 127   VERIFY( state2 == stateeof );
 128   strtmp = isbuf_03.str();
 129   VERIFY( strtmp == str_02 ); // as only an "in" buffer
 130   VERIFY( isbuf_03.sgetc() == 'a' );
 131   VERIFY( is_04.peek() == ctraits_type::eof() );
 132 }
 133
 134 int main()
 135 {
 136   test01();
 137   return 0;
 138 }