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

   1 // { dg-add-options ieee }
   2
   3 // 1999-08-23 bkoz
   4
   5 // Copyright (C) 1999-2013 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 // 18.2.1.1 template class numeric_limits
  23
  24 #include <limits>
  25 #include <limits.h>
  26 #include <float.h>
  27 #include <cwchar>
  28 #include <testsuite_hooks.h>
  29
  30 template<typename T>
  31 struct extrema {
  32   static T min;
  33   static T max;
  34 };
  35
  36
  37 #define DEFINE_EXTREMA(T, m, M) \
  38   template<> T extrema<T>::min = m; \
  39   template<> T extrema<T>::max = M
  40
  41 DEFINE_EXTREMA(char, CHAR_MIN, CHAR_MAX);
  42 DEFINE_EXTREMA(signed char, SCHAR_MIN, SCHAR_MAX);
  43 DEFINE_EXTREMA(unsigned char, 0, UCHAR_MAX);
  44 DEFINE_EXTREMA(short, SHRT_MIN, SHRT_MAX);
  45 DEFINE_EXTREMA(unsigned short, 0, USHRT_MAX);
  46 DEFINE_EXTREMA(int, INT_MIN, INT_MAX);
  47 DEFINE_EXTREMA(unsigned, 0U, UINT_MAX);
  48 DEFINE_EXTREMA(long, LONG_MIN, LONG_MAX);
  49 DEFINE_EXTREMA(unsigned long, 0UL, ULONG_MAX);
  50
  51 #if _GLIBCXX_USE_WCHAR_T
  52 DEFINE_EXTREMA(wchar_t, WCHAR_MIN, WCHAR_MAX);
  53 #endif //_GLIBCXX_USE_WCHAR_T
  54
  55 DEFINE_EXTREMA(float, FLT_MIN, FLT_MAX);
  56 DEFINE_EXTREMA(double, DBL_MIN, DBL_MAX);
  57 DEFINE_EXTREMA(long double, LDBL_MIN, LDBL_MAX);
  58
  59 #undef DEFINE_EXTREMA
  60
  61 template<typename T>
  62 void test_extrema()
  63 {
  64   bool test __attribute__((unused)) = true;
  65   T limits_min = std::numeric_limits<T>::min();
  66   T limits_max = std::numeric_limits<T>::max();
  67   T extrema_min = extrema<T>::min;
  68   T extrema_max = extrema<T>::max;
  69   VERIFY( extrema_min == limits_min );
  70   VERIFY( extrema_max == limits_max );
  71 }
  72
  73 int main()
  74 {
  75   test_extrema<char>();
  76   test_extrema<signed char>();
  77   test_extrema<unsigned char>();
  78
  79   test_extrema<short>();
  80   test_extrema<unsigned short>();
  81
  82   test_extrema<int>();
  83   test_extrema<unsigned>();
  84
  85   test_extrema<long>();
  86   test_extrema<unsigned long>();
  87
  88   test_extrema<float>();
  89   test_extrema<double>();
  90   test_extrema<long double>();
  91
  92   return 0;
  93 }