libstdc++-v3/testsuite/20_util/monotonic_buffer_resource/upstream_resource.cc

   1 // Copyright (C) 2018-2020 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-options "-std=gnu++17" }
  19 // { dg-do run { target c++17 } }
  20
  21 #include <memory_resource>
  22 #include <testsuite_allocator.h>
  23
  24 void
  25 test01()
  26 {
  27   __gnu_test::memory_resource r;
  28   const auto null = std::pmr::null_memory_resource();
  29   const auto newdel = std::pmr::new_delete_resource();
  30   std::pmr::set_default_resource(null);
  31
  32   {
  33     std::pmr::monotonic_buffer_resource mr(&r);
  34     VERIFY( mr.upstream_resource() == &r );
  35     __gnu_test::default_resource_mgr _(newdel);
  36     VERIFY( mr.upstream_resource() == &r );
  37   }
  38   {
  39     std::pmr::monotonic_buffer_resource mr(128, &r);
  40     VERIFY( mr.upstream_resource() == &r );
  41     __gnu_test::default_resource_mgr _(newdel);
  42     VERIFY( mr.upstream_resource() == &r );
  43   }
  44   {
  45     unsigned char buf[64];
  46     std::pmr::monotonic_buffer_resource mr((void*)buf, sizeof(buf), &r);
  47     VERIFY( mr.upstream_resource() == &r );
  48     __gnu_test::default_resource_mgr _(newdel);
  49     VERIFY( mr.upstream_resource() == &r );
  50   }
  51   {
  52     std::pmr::monotonic_buffer_resource mr;
  53     VERIFY( mr.upstream_resource() == null );
  54     __gnu_test::default_resource_mgr _(newdel);
  55     VERIFY( mr.upstream_resource() == null );
  56   }
  57   {
  58     std::pmr::monotonic_buffer_resource mr(64);
  59     VERIFY( mr.upstream_resource() == null );
  60     __gnu_test::default_resource_mgr _(newdel);
  61     VERIFY( mr.upstream_resource() == null );
  62   }
  63   {
  64     unsigned char buf[64];
  65     std::pmr::monotonic_buffer_resource mr((void*)buf, sizeof(buf));
  66     VERIFY( mr.upstream_resource() == null );
  67     __gnu_test::default_resource_mgr _(newdel);
  68     VERIFY( mr.upstream_resource() == null );
  69   }
  70 }
  71
  72 int
  73 main()
  74 {
  75   test01();
  76 }