libstdc++-v3/testsuite/23_containers/vector/bool/cmp_c++20.cc

   1 // Copyright (C) 2020-2024 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 compile { target c++20 } }
  19
  20 #include <vector>
  21 #include <testsuite_hooks.h>
  22
  23 constexpr bool
  24 test01()
  25 {
  26   std::vector<bool> c1{ 1, 0, 1 }, c2{ 1, 0, 1, 0 }, c3{ 1, 1, 1 };
  27   VERIFY( c1 == c1 );
  28   VERIFY( std::is_eq(c1 <=> c1) );
  29   VERIFY( c1 < c2 );
  30   VERIFY( std::is_lt(c1 <=> c2) );
  31   VERIFY( c1 < c3 );
  32   VERIFY( std::is_lt(c1 <=> c3) );
  33   VERIFY( c2 < c3 );
  34   VERIFY( std::is_lt(c2 <=> c3) );
  35
  36   static_assert( std::totally_ordered<std::vector<bool>> );
  37
  38   static_assert( std::three_way_comparable<std::vector<bool>,
  39                                            std::strong_ordering> );
  40
  41   return true;
  42 }
  43
  44 constexpr bool
  45 test05()
  46 {
  47   // vector<bool> iterators are random access, so should support <=>
  48
  49   std::vector<bool> c{ 1, 1, 1 };
  50   VERIFY( c.begin() == c.cbegin() );
  51   VERIFY( std::is_eq(c.begin() <=> c.cbegin()) );
  52
  53   VERIFY( c.begin() < c.end() );
  54   VERIFY( std::is_lt(c.begin() <=> c.end()) );
  55
  56   VERIFY( c.begin() < c.cend() );
  57   VERIFY( std::is_lt(c.begin() <=> c.cend()) );
  58
  59   VERIFY( c.crbegin() == c.rbegin() );
  60   VERIFY( std::is_eq(c.crbegin() <=> c.rbegin()) );
  61
  62   VERIFY( c.rend() > c.rbegin() );
  63   VERIFY( std::is_gt(c.rend() <=> c.rbegin()) );
  64
  65   static_assert( std::same_as<decltype(c.begin() <=> c.begin()),
  66                               std::strong_ordering> );
  67
  68   return true;
  69 }
  70
  71 static_assert( test01() );
  72 static_assert( test05() );