libstdc++-v3/testsuite/23_containers/array/comparison_operators/constexpr.cc

   1 // { dg-do compile { target c++20 } }
   2 // { dg-add-options no_pch }
   3
   4 // Copyright (C) 2019-2025 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <array>
  22
  23 #ifndef __cpp_lib_array_constexpr
  24 # error "Feature test macro for array constexpr is missing in <array>"
  25 #elif __cpp_lib_array_constexpr < 201806L
  26 # error "Feature test macro for array constexpr has wrong value in <array>"
  27 #endif
  28
  29 constexpr std::array<int, 3> a1{{1, 2, 3}};
  30 constexpr std::array<int, 3> a2{{4, 5, 6}};
  31 constexpr std::array<int, 3> a3{{1, 2, 4}};
  32 constexpr std::array<int, 3> a4{{1, 3, 3}};
  33
  34 static_assert(a1 == a1);
  35 static_assert(a1 != a2);
  36 static_assert(a1 < a3);
  37 static_assert(a4 > a1);
  38 static_assert(a1 <= a3);
  39 static_assert(a4 >= a1);
  40 static_assert(std::is_eq(a1 <=> a1));
  41 static_assert(std::is_neq(a1 <=> a2));
  42 static_assert(std::is_lt(a1 <=> a3));
  43 static_assert(std::is_gt(a4 <=> a1));
  44
  45 constexpr std::array<unsigned char, 3> a5{{1, 2, 3}};
  46 constexpr std::array<unsigned char, 3> a6{{4, 5, 6}};
  47 constexpr std::array<unsigned char, 3> a7{{1, 2, 4}};
  48 constexpr std::array<unsigned char, 3> a8{{1, 3, 3}};
  49
  50 static_assert(a5 == a5);
  51 static_assert(a5 != a6);
  52 static_assert(a5 < a7);
  53 static_assert(a8 > a5);
  54 static_assert(a5 <= a7);
  55 static_assert(a8 >= a5);
  56 static_assert(std::is_eq(a5 <=> a5));
  57 static_assert(std::is_neq(a5 <=> a6));
  58 static_assert(std::is_lt(a5 <=> a7));
  59 static_assert(std::is_gt(a8 <=> a5));