libstdc++-v3/testsuite/experimental/memory_resource/resource_adaptor.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2016-2018 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_resource>
  21 #include <testsuite_hooks.h>
  22 #include <testsuite_allocator.h>
  23
  24 using std::experimental::pmr::memory_resource;
  25 using std::experimental::pmr::resource_adaptor;
  26
  27 template<typename T>
  28   struct Allocator : __gnu_test::SimpleAllocator<T>
  29   {
  30     Allocator(int) { } // not default constructible
  31
  32     template<typename U>
  33       Allocator(const Allocator<U>&) { }
  34   };
  35
  36 template<typename T>
  37   bool aligned(void* p)
  38   {
  39     return (reinterpret_cast<std::uintptr_t>(p) % alignof(T)) == 0;
  40   }
  41
  42 // resource_adaptor
  43 void
  44 test05()
  45 {
  46   using std::max_align_t;
  47   using std::uintptr_t;
  48   void* p = nullptr;
  49
  50   Allocator<int> a1(1), a2(2); // minimal interface allocators
  51   resource_adaptor<decltype(a1)> r1(a1), r2(a2);
  52   VERIFY( r1 == r1 );
  53   VERIFY( r1 == r2 );
  54   p = r1.allocate(1);
  55   VERIFY( aligned<max_align_t>(p) );
  56   r1.deallocate(p, 1);
  57   p = r1.allocate(1, alignof(short));
  58   VERIFY( aligned<short>(p) );
  59   r1.deallocate(p, 1, alignof(short));
  60   p = r1.allocate(1, alignof(long));
  61   VERIFY( aligned<long>(p) );
  62   r1.deallocate(p, 1, alignof(long));
  63
  64   __gnu_test::uneq_allocator<double> a3(3), a4(4); // non-equal allocators
  65   resource_adaptor<decltype(a3)> r3(a3), r4(a4);
  66   VERIFY( r3 == r3 );
  67   VERIFY( r4 == r4 );
  68   VERIFY( r3 != r4 );
  69   p = r3.allocate(1);
  70   VERIFY( aligned<max_align_t>(p) );
  71   r3.deallocate(p, 1);
  72   p = r3.allocate(1, alignof(short));
  73   VERIFY( aligned<short>(p) );
  74   r3.deallocate(p, 1, alignof(short));
  75   p = r3.allocate(1, alignof(long));
  76   VERIFY( aligned<long>(p) );
  77   r3.deallocate(p, 1, alignof(long));
  78
  79   // TODO test with an allocator that doesn't use new or malloc, so
  80   // returns pointers that are not suitably aligned for any type.
  81 }
  82
  83 int main()
  84 {
  85   test05();
  86 }