libstdc++-v3/testsuite/20_util/integer_comparisons/less.cc

   1 // Copyright (C) 2020-2023 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 { target c++20 } }
  19
  20 #include <utility>
  21 #include <limits>
  22 #include <testsuite_hooks.h>
  23
  24 void
  25 test01()
  26 {
  27   unsigned int u = std::numeric_limits<unsigned int>::max();
  28   int s = -1;
  29   VERIFY( std::cmp_less(s, u) );
  30   VERIFY( !std::cmp_less(u, s) );
  31   u = (unsigned) std::numeric_limits<int>::max() + 1U;
  32   VERIFY( std::cmp_less(s, u) );
  33   VERIFY( !std::cmp_less(u, s) );
  34 }
  35
  36 constexpr bool
  37 test02()
  38 {
  39   unsigned int u = std::numeric_limits<unsigned int>::max();
  40   int s = -1;
  41   if (!std::cmp_less(s, u))
  42     throw 1;
  43   if (std::cmp_less(u, s))
  44     throw 2;
  45   return true;
  46 }
  47
  48 void
  49 test03()
  50 {
  51   short ss = -1;
  52   int s = -1;
  53   VERIFY( !std::cmp_less(s, ss) );
  54   VERIFY( !std::cmp_less(ss, s) );
  55
  56   unsigned int u = (unsigned int) -1;
  57   VERIFY( std::cmp_less(s, u) );
  58   VERIFY( !std::cmp_less(u, s) );
  59   VERIFY( std::cmp_less(ss, u) );
  60   VERIFY( !std::cmp_less(u, ss) );
  61
  62   unsigned long long ul = (unsigned long long) -1;
  63   VERIFY( std::cmp_less(s, ul) );
  64   VERIFY( !std::cmp_less(ul, s) );
  65   VERIFY( std::cmp_less(ss, ul) );
  66   VERIFY( !std::cmp_less(ul, ss) );
  67   VERIFY( std::cmp_less(u, ul) );
  68   VERIFY( !std::cmp_less(ul, u) );
  69 }
  70
  71 int
  72 main()
  73 {
  74   test01();
  75   static_assert( test02() );
  76   test03();
  77 }