libstdc++-v3/testsuite/20_util/specialized_algorithms/construct_at/95788.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 // FIXME [!HOSTED]: avoidable std::allocator usage
  20 // { dg-require-effective-target hosted }
  21
  22 #include <memory>
  23
  24 constexpr bool
  25 test01()
  26 {
  27   const int sz{1};
  28   int* data{std::allocator<int>{}.allocate(sz)};
  29   static_assert(noexcept(std::ranges::construct_at(data, 42)));
  30   std::ranges::construct_at(data, 42);
  31   if (*data != 42)
  32     return false;
  33   std::ranges::destroy_at(data);
  34   std::allocator<int>{}.deallocate(data, sz);
  35   return true;
  36 }
  37
  38 static_assert(test01());
  39
  40 struct S { S(); };
  41 S* p;
  42 static_assert(!noexcept(std::ranges::construct_at(p)));