libstdc++-v3/testsuite/27_io/basic_ostream/inserters_arithmetic/wchar_t/6.cc

   1 // Copyright (C) 2005-2020 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 // { dg-do run { xfail lax_strtofp } }
  19
  20 #include <cmath> // for abs
  21 #include <cfloat> // for DBL_EPSILON
  22 #include <sstream>
  23 #include <limits>
  24 #include <testsuite_hooks.h>
  25
  26 // libstdc++/9151
  27 void
  28 test06()
  29 {
  30   using namespace std;
  31
  32   int prec = numeric_limits<double>::digits10 + 2;
  33   double oval = numeric_limits<double>::min();
  34
  35   wstringstream ostr;
  36   ostr.precision(prec);
  37   ostr << oval;
  38   wstring sval = ostr.str();
  39   wistringstream istr(sval);
  40   double ival;
  41   istr >> ival;
  42   VERIFY( abs(oval-ival)/oval < DBL_EPSILON );
  43 }
  44
  45 int
  46 main()
  47 {
  48   test06();
  49   return 0;
  50 }