libstdc++-v3/testsuite/experimental/memory/observer_ptr/requirements.cc

   1 // { dg-do compile { target c++14 } }
   2
   3 // Copyright (C) 2015-2020 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <experimental/memory>
  21
  22 using std::experimental::observer_ptr;
  23
  24 struct nontrivial {nontrivial() {}};
  25 struct other {};
  26 struct base {};
  27 struct derived : base {};
  28
  29 static_assert(!std::is_trivially_constructible<
  30               observer_ptr<nontrivial>>::value, "");
  31 static_assert(std::is_trivially_copyable<
  32               observer_ptr<nontrivial>>::value, "");
  33 static_assert(std::is_trivially_destructible<
  34               observer_ptr<nontrivial>>::value, "");
  35
  36 static_assert(std::is_constructible<
  37               observer_ptr<nontrivial>, nontrivial*>::value,
  38               "");
  39 static_assert(std::is_constructible<observer_ptr<base>, base*>::value, "");
  40 static_assert(std::is_constructible<observer_ptr<base>, derived*>::value, "");
  41 static_assert(!std::is_constructible<observer_ptr<base>, other*>::value, "");
  42 static_assert(std::is_constructible<
  43                 observer_ptr<base>, observer_ptr<base>>::value, "");
  44 static_assert(std::is_constructible<
  45                 observer_ptr<base>, observer_ptr<derived>>::value, "");
  46 static_assert(!std::is_constructible<
  47                 observer_ptr<base>, observer_ptr<other>>::value, "");
  48
  49 static_assert(!std::is_assignable<
  50               observer_ptr<nontrivial>, nontrivial*>::value,
  51               "");
  52 static_assert(std::is_assignable<
  53               observer_ptr<nontrivial>, observer_ptr<nontrivial>>::value,
  54               "");
  55 static_assert(std::is_assignable<observer_ptr<base>,
  56               observer_ptr<base>>::value, "");
  57 static_assert(std::is_assignable<observer_ptr<base>,
  58               observer_ptr<derived>>::value, "");
  59 static_assert(!std::is_assignable<
  60                 observer_ptr<base>, observer_ptr<other>>::value, "");
  61 static_assert(std::is_assignable<observer_ptr<const int>,
  62               observer_ptr<int>>::value, "");
  63 static_assert(!std::is_assignable<observer_ptr<int>,
  64               observer_ptr<const int>>::value, "");