libstdc++-v3/testsuite/23_containers/array/requirements/constexpr_fill.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 < 201811L
  26 # error "Feature test macro for array constexpr has wrong value in <array>"
  27 #endif
  28
  29 constexpr bool
  30 test_array()
  31 {
  32   auto ok = true;
  33
  34   std::array<float,3> fa{};
  35   fa.fill(3.333f);
  36
  37   ok = ok && (fa[0] == fa[2]);
  38
  39   return ok;
  40 }
  41
  42 static_assert(test_array());