libstdc++-v3/testsuite/23_containers/array/creation/1.cc

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do compile { target c++2a } }
   3
   4 // Copyright (C) 2019-2020 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_to_array
  24 # error "Feature test macro for to_array is missing"
  25 #elif __cpp_lib_to_array < 201907L
  26 # error "Feature test macro for to_array has wrong value"
  27 #endif
  28
  29 void test01()
  30 {
  31   const char x[6]{};
  32   std::array<char, 6> y = std::to_array(x);
  33
  34   constexpr char x2[] = "foo";
  35   constexpr std::array<char, 4> y2 = std::to_array(x2);
  36   static_assert( std::equal(y2.begin(), y2.end(), x2) );
  37 }
  38
  39 void
  40 test02()
  41 {
  42   struct MoveOnly
  43   {
  44     constexpr MoveOnly(int i = 0) : i(i) { }
  45     constexpr MoveOnly(MoveOnly&& m) : i(m.i + 100) { }
  46     int i;
  47   };
  48
  49   struct X {
  50     MoveOnly m[3];
  51   };
  52   X x;
  53   std::array<MoveOnly, 3> y = std::to_array(std::move(x).m);
  54
  55   constexpr std::array<MoveOnly, 3> y2 = std::to_array(X{{1, 2, 3}}.m);
  56   static_assert( y2[0].i == 101 && y2[1].i == 102 && y2[2].i == 103 );
  57 }