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

   1 // Copyright (C) 2018-2023 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-do run { target c++17 } }
  19
  20 #include <memory_resource>
  21 #include <testsuite_allocator.h>
  22
  23 void
  24 test01()
  25 {
  26   __gnu_test::memory_resource r;
  27   const auto null = std::pmr::null_memory_resource();
  28   const auto newdel = std::pmr::new_delete_resource();
  29   std::pmr::set_default_resource(null);
  30
  31   {
  32     std::pmr::monotonic_buffer_resource mr(&r);
  33     VERIFY( mr.upstream_resource() == &r );
  34     __gnu_test::default_resource_mgr _(newdel);
  35     VERIFY( mr.upstream_resource() == &r );
  36   }
  37   {
  38     std::pmr::monotonic_buffer_resource mr(128, &r);
  39     VERIFY( mr.upstream_resource() == &r );
  40     __gnu_test::default_resource_mgr _(newdel);
  41     VERIFY( mr.upstream_resource() == &r );
  42   }
  43   {
  44     unsigned char buf[64];
  45     std::pmr::monotonic_buffer_resource mr((void*)buf, sizeof(buf), &r);
  46     VERIFY( mr.upstream_resource() == &r );
  47     __gnu_test::default_resource_mgr _(newdel);
  48     VERIFY( mr.upstream_resource() == &r );
  49   }
  50   {
  51     std::pmr::monotonic_buffer_resource mr;
  52     VERIFY( mr.upstream_resource() == null );
  53     __gnu_test::default_resource_mgr _(newdel);
  54     VERIFY( mr.upstream_resource() == null );
  55   }
  56   {
  57     std::pmr::monotonic_buffer_resource mr(64);
  58     VERIFY( mr.upstream_resource() == null );
  59     __gnu_test::default_resource_mgr _(newdel);
  60     VERIFY( mr.upstream_resource() == null );
  61   }
  62   {
  63     unsigned char buf[64];
  64     std::pmr::monotonic_buffer_resource mr((void*)buf, sizeof(buf));
  65     VERIFY( mr.upstream_resource() == null );
  66     __gnu_test::default_resource_mgr _(newdel);
  67     VERIFY( mr.upstream_resource() == null );
  68   }
  69 }
  70
  71 int
  72 main()
  73 {
  74   test01();
  75 }