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

   1 // Copyright (C) 2020-2022 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-options "-std=gnu++2a" }
  19 // { dg-do run { target c++2a } }
  20
  21 #include <utility>
  22 #include <limits>
  23 #include <testsuite_hooks.h>
  24
  25 void
  26 test01()
  27 {
  28   unsigned int u = std::numeric_limits<unsigned int>::max();
  29   VERIFY( std::in_range<unsigned int>(u) );
  30   VERIFY( !std::in_range<int>(u) );
  31   int s = -1;
  32   VERIFY( !std::in_range<unsigned int>(s) );
  33   s = std::numeric_limits<int>::max();
  34   VERIFY( std::in_range<unsigned int>(s) );
  35 }
  36
  37 constexpr bool
  38 test02()
  39 {
  40   unsigned int u = std::numeric_limits<unsigned int>::max();
  41   if (std::in_range<int>(u))
  42     throw 1;
  43   int s = -1;
  44   if (std::in_range<unsigned>(s))
  45     throw 2;
  46   s = std::numeric_limits<int>::max();
  47   if (!std::in_range<unsigned>(s))
  48     throw 3;
  49   return true;
  50 }
  51
  52 void
  53 test03()
  54 {
  55   short ss = -1;
  56   VERIFY( std::in_range<int>(ss) );
  57   VERIFY( !std::in_range<unsigned>(ss) );
  58   int s = -1;
  59   VERIFY( std::in_range<short>(s) );
  60   VERIFY( !std::in_range<unsigned>(s) );
  61   VERIFY( !std::in_range<unsigned long>(s) );
  62   VERIFY( std::in_range<long>(s) );
  63   s = std::numeric_limits<short>::min() - 1;
  64   VERIFY( !std::in_range<short>(s) );
  65
  66   unsigned int u = (unsigned int) -1;
  67   VERIFY( !std::in_range<int>(u) );
  68   VERIFY( !std::in_range<unsigned short>(u) );
  69
  70   unsigned long ul = (unsigned long) -1;
  71   VERIFY( !std::in_range<unsigned short>(ul) );
  72   VERIFY( std::in_range<unsigned long long>(ul) );
  73 }
  74
  75 int
  76 main()
  77 {
  78   test01();
  79   static_assert( test02() );
  80   test03();
  81 }