libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/char/13.cc

   1 // 1999-04-12 bkoz
   2
   3 // Copyright (C) 1999-2016 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 // 27.6.1.2.2 arithmetic extractors
  21
  22 #include <istream>
  23 #include <sstream>
  24 #include <locale>
  25 #include <limits>
  26 #include <testsuite_hooks.h>
  27
  28 // libstdc++/3720 part two
  29 void test13()
  30 {
  31   using namespace std;
  32   bool test __attribute__((unused)) = true;
  33   const char* l2 = "1.2345678901234567890123456789012345678901234567890123456"
  34                    "  "
  35                    "1246.9";
  36
  37   // 1
  38   // used to core.
  39   double d;
  40   istringstream iss1(l2);
  41   iss1 >> d;
  42   iss1 >> d;
  43   VERIFY (d > 1246 && d < 1247);
  44
  45   // 2
  46   // quick test for failbit on maximum length extraction.
  47   int i;
  48   int max_digits = numeric_limits<int>::digits10 + 1;
  49   string digits;
  50   for (int j = 0; j < max_digits; ++j)
  51     digits += '1';
  52   istringstream iss2(digits);
  53   iss2 >> i;
  54   VERIFY( !iss2.fail() );
  55
  56   digits += '1';
  57   i = 0;
  58   iss2.str(digits);
  59   iss2.clear();
  60   iss2 >> i;
  61   VERIFY( i == numeric_limits<int>::max() );
  62   VERIFY( iss2.fail() );
  63 }
  64
  65 int main()
  66 {
  67   test13();
  68   return 0;
  69 }