libstdc++-v3/testsuite/20_util/any/cons/aligned.cc

   1 // Copyright (C) 2015-2020 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-options "-std=gnu++17" }
  19 // { dg-do run { target c++17 } }
  20 // { dg-require-cstdint "" }
  21
  22 #include <any>
  23 #include <cstdint>
  24 #include <testsuite_hooks.h>
  25
  26 // Alignment requiremnts of this type prevent it being stored in 'any'
  27 struct alignas(2 * alignof(void*)) X { };
  28
  29 bool
  30 stored_internally(void* obj, const std::any& a)
  31 {
  32   std::uintptr_t a_addr = reinterpret_cast<std::uintptr_t>(&a);
  33   std::uintptr_t a_end = a_addr + sizeof(a);
  34   std::uintptr_t obj_addr = reinterpret_cast<std::uintptr_t>(obj);
  35   return (a_addr <= obj_addr) && (obj_addr < a_end);
  36 }
  37
  38 void
  39 test01()
  40 {
  41   std::any a = X{};
  42   X& x = std::any_cast<X&>(a);
  43   VERIFY( !stored_internally(&x, a) );
  44
  45   a = 'X';
  46   char& c = std::any_cast<char&>(a);
  47   VERIFY( stored_internally(&c, a) );
  48 }
  49
  50 int
  51 main()
  52 {
  53   test01();
  54 }