libstdc++-v3/testsuite/experimental/any/cons/aligned.cc

   1 // Copyright (C) 2015-2018 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 run { target c++14 } }
  19 // { dg-require-cstdint "" }
  20
  21 #include <experimental/any>
  22 #include <cstdint>
  23 #include <testsuite_hooks.h>
  24
  25 // Alignment requiremnts of this type prevent it being stored in 'any'
  26 struct alignas(2 * alignof(void*)) X { };
  27
  28 bool
  29 stored_internally(void* obj, const std::experimental::any& a)
  30 {
  31   std::uintptr_t a_addr = reinterpret_cast<std::uintptr_t>(&a);
  32   std::uintptr_t a_end = a_addr + sizeof(a);
  33   std::uintptr_t obj_addr = reinterpret_cast<std::uintptr_t>(obj);
  34   return (a_addr <= obj_addr) && (obj_addr < a_end);
  35 }
  36
  37 void
  38 test01()
  39 {
  40   std::experimental::any a = X{};
  41   X& x = std::experimental::any_cast<X&>(a);
  42   VERIFY( !stored_internally(&x, a) );
  43
  44   a = 'X';
  45   char& c = std::experimental::any_cast<char&>(a);
  46   VERIFY( stored_internally(&c, a) );
  47 }
  48
  49 int
  50 main()
  51 {
  52   test01();
  53 }