libstdc++-v3/testsuite/18_support/numeric_limits/lowest.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-add-options ieee }
   3
   4 // 2010-02-25  Ed Smith-Rowland
   5
   6 // Copyright (C) 2010-2019 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 // 18.2.1.1 template class numeric_limits
  24
  25 #include <limits>
  26 #include <type_traits>
  27 #include <testsuite_hooks.h>
  28
  29 template<typename T>
  30   void
  31   do_test(std::true_type)
  32   {
  33     T limits_min = std::numeric_limits<T>::min();
  34     VERIFY( std::numeric_limits<T>::lowest() == limits_min );
  35   }
  36
  37 template<typename T>
  38   void
  39   do_test(std::false_type)
  40   {
  41     T limits_max = std::numeric_limits<T>::max();
  42     VERIFY( std::numeric_limits<T>::lowest() == -limits_max );
  43   }
  44
  45 template<typename Tp>
  46   void
  47   do_test()
  48   { do_test<Tp>(typename std::is_integral<Tp>::type()); }
  49
  50 void test01()
  51 {
  52   do_test<char>();
  53   do_test<signed char>();
  54   do_test<unsigned char>();
  55 #ifdef _GLIBCXX_USE_WCHAR_T
  56   do_test<wchar_t>();
  57 #endif
  58 #ifdef _GLIBCXX_USE_CHAR8_T
  59   do_test<char8_t>();
  60 #endif
  61   do_test<char16_t>();
  62   do_test<char32_t>();
  63
  64   do_test<short>();
  65   do_test<unsigned short>();
  66
  67   do_test<int>();
  68   do_test<unsigned int>();
  69
  70   do_test<long>();
  71   do_test<unsigned long>();
  72
  73   do_test<long long>();
  74   do_test<unsigned long long>();
  75
  76   // GNU Extensions.
  77 #ifdef _GLIBCXX_USE_INT128
  78   do_test<__int128>();
  79   do_test<unsigned __int128>();
  80 #endif
  81
  82   do_test<float>();
  83   do_test<double>();
  84   do_test<long double>();
  85 }
  86
  87 int main()
  88 {
  89   test01();
  90   return 0;
  91 }