libstdc++-v3/testsuite/20_util/allocator_traits/members/allocate_hint_nonpod.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2014-2022 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 <memory>
  21 #include <testsuite_allocator.h>
  22
  23 // User-defined pointer type with non-trivial destructor.
  24 template<typename T>
  25 struct Pointer : __gnu_test::PointerBase<Pointer<T>, T>
  26 {
  27   using __gnu_test::PointerBase<Pointer<T>, T>::PointerBase;
  28
  29   ~Pointer() { /* non-trivial */ }
  30 };
  31
  32 // Minimal allocator with user-defined pointer type.
  33 template<typename T>
  34 struct Alloc
  35 {
  36   typedef T value_type;
  37   typedef Pointer<T> pointer;
  38
  39   Alloc() = default;
  40
  41   template<typename U>
  42     Alloc(const Alloc<U>&) { }
  43
  44   pointer allocate(std::size_t n)  // does not take a hint
  45   { return pointer(std::allocator<T>().allocate(n)); }
  46
  47   void deallocate(pointer p, std::size_t n)
  48   { std::allocator<T>().deallocate(p.operator->(), n); }
  49 };
  50
  51 template<typename T>
  52 bool operator==(Alloc<T> l, Alloc<T> r) { return true; }
  53
  54 template<typename T>
  55 bool operator!=(Alloc<T> l, Alloc<T> r) { return false; }
  56
  57 void test01()
  58 {
  59   typedef std::allocator_traits<Alloc<int>> traits_type;
  60   traits_type::allocator_type a;
  61   traits_type::const_void_pointer v;
  62   traits_type::pointer p = traits_type::allocate(a, 1, v);
  63   traits_type::deallocate(a, p, 1);
  64 }
  65
  66 int main()
  67 {
  68   test01();
  69 }