libstdc++-v3/testsuite/20_util/unique_ptr/hash/1.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // 2010-06-11  Paolo Carlini  <paolo.carlini@oracle.com>
   4
   5 // Copyright (C) 2010-2016 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  21
  22 #include <memory>
  23 #include <testsuite_hooks.h>
  24 #include <testsuite_allocator.h>
  25
  26 // User-defined pointer type that throws if a null pointer is dereferenced.
  27 template<typename T>
  28 struct Pointer : __gnu_test::PointerBase<Pointer<T>, T>
  29 {
  30 };
  31
  32 template<typename T>
  33 struct PointerDeleter : std::default_delete<T>
  34 {
  35   typedef Pointer<T> pointer;
  36   void operator()(pointer) const;
  37 };
  38
  39 template<class T>
  40 auto f(int) -> decltype(std::hash<std::unique_ptr<T,
  41                         PointerDeleter<T>>>(), std::true_type());
  42
  43 template<class T>
  44 auto f(...) -> decltype(std::false_type());
  45
  46 static_assert(!decltype(f<Pointer<int>>(0))::value, "");
  47
  48 void test01()
  49 {
  50   struct T { };
  51
  52   std::unique_ptr<T>                                 u0(new T);
  53   std::hash<std::unique_ptr<T>>                      hu0;
  54   std::hash<typename std::unique_ptr<T>::pointer>    hp0;
  55
  56   VERIFY( hu0(u0) == hp0(u0.get()) );
  57
  58   std::unique_ptr<T[]>                               u1(new T[10]);
  59   std::hash<std::unique_ptr<T[]>>                    hu1;
  60   std::hash<typename std::unique_ptr<T[]>::pointer>  hp1;
  61
  62   VERIFY( hu1(u1) == hp1(u1.get()) );
  63 }
  64
  65 int main()
  66 {
  67   test01();
  68   return 0;
  69 }