libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/13.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 // 27.6.1.2.2 arithmetic extractors
  19
  20 #include <istream>
  21 #include <sstream>
  22 #include <locale>
  23 #include <limits>
  24 #include <testsuite_hooks.h>
  25
  26 // libstdc++/3720 part two
  27 void test13()
  28 {
  29   using namespace std;
  30   const wchar_t* l2 = L"1.2345678901234567890123456789012345678901234567890123456"
  31                       L"  "
  32                       L"1246.9";
  33
  34   // 1
  35   // used to core.
  36   double d;
  37   wistringstream iss1(l2);
  38   iss1 >> d;
  39   iss1 >> d;
  40   VERIFY ( d > 1246 && d < 1247 );
  41
  42   // 2
  43   // quick test for failbit on maximum length extraction.
  44   int i;
  45   int max_digits = numeric_limits<int>::digits10 + 1;
  46   wstring digits;
  47   for (int j = 0; j < max_digits; ++j)
  48     digits += L'1';
  49   wistringstream iss2(digits);
  50   iss2 >> i;
  51   VERIFY( !iss2.fail() );
  52
  53   digits += L'1';
  54   i = 0;
  55   iss2.str(digits);
  56   iss2.clear();
  57   iss2 >> i;
  58   VERIFY( i == numeric_limits<int>::max() );
  59   VERIFY( iss2.fail() );
  60 }
  61
  62 int main()
  63 {
  64   test13();
  65   return 0;
  66 }