Add initial version of C++17 <memory_resource> header

[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 20_util / monotonic_buffer_resource / deallocate.cc

diff --git a/libstdc++-v3/testsuite/20_util/monotonic_buffer_resource/deallocate.cc b/libstdc++-v3/testsuite/20_util/monotonic_buffer_resource/deallocate.cc
new file mode 100644 (file)
index 0000000..427256d
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/monotonic_buffer_resource/deallocate.cc
@@ -0,0 +1,103 @@
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++17" }
+// { dg-do run { target c++17 } }
+
+#include <memory_resource>
+#include <testsuite_allocator.h>
+
+struct resource : __gnu_test::memory_resource
+{
+  int allocate_calls = 0;
+  int deallocate_calls = 0;
+
+  void*
+  do_allocate(std::size_t bytes, std::size_t align) override
+  {
+    ++allocate_calls;
+    return __gnu_test::memory_resource::do_allocate(bytes, align);
+  }
+
+  void
+  do_deallocate(void* p, std::size_t bytes, std::size_t align) override
+  {
+    ++deallocate_calls;
+    __gnu_test::memory_resource::do_deallocate(p, bytes, align);
+  }
+};
+
+void
+test01()
+{
+  resource r;
+
+  // test that it's possible to deallocate after each of the constructors
+  {
+    std::pmr::monotonic_buffer_resource mr(&r);
+    auto p = mr.allocate(1024);
+    VERIFY( p != nullptr );
+    const std::uintptr_t pi = reinterpret_cast<std::uintptr_t>(p);
+    mr.deallocate(p, 1024);
+    VERIFY( r.deallocate_calls == 0 );
+    auto q = mr.allocate(1024);
+    VERIFY( q != nullptr );
+    VERIFY( pi != reinterpret_cast<std::uintptr_t>(q) );
+    mr.deallocate(q, 1024);
+    VERIFY( r.deallocate_calls == 0 );
+  }
+  VERIFY( r.deallocate_calls == r.allocate_calls );
+  VERIFY( r.number_of_active_allocations() == 0 );
+  {
+    r.deallocate_calls = r.allocate_calls = 0;
+    std::pmr::monotonic_buffer_resource mr(128, &r);
+    auto p = mr.allocate(64);
+    VERIFY( p != nullptr );
+    const std::uintptr_t pi = reinterpret_cast<std::uintptr_t>(p);
+    mr.deallocate(p, 64);
+    auto q = mr.allocate(1024);
+    VERIFY( q != nullptr );
+    VERIFY( p != q );
+    VERIFY( pi != reinterpret_cast<std::uintptr_t>(q) );
+    mr.deallocate(q, 1024);
+    VERIFY( r.deallocate_calls == 0 );
+  }
+  VERIFY( r.number_of_active_allocations() == 0 );
+  {
+    r.deallocate_calls = r.allocate_calls = 0;
+    unsigned char buf[64];
+    std::pmr::monotonic_buffer_resource mr((void*)buf, sizeof(buf), &r);
+    auto p = mr.allocate(64);
+    VERIFY( p != nullptr );
+    const std::uintptr_t pi = reinterpret_cast<std::uintptr_t>(p);
+    mr.deallocate(p, 64);
+    auto q = mr.allocate(1024);
+    VERIFY( q != nullptr );
+    VERIFY( p != q );
+    VERIFY( pi != reinterpret_cast<std::uintptr_t>(q) );
+    mr.deallocate(q, 1024);
+    VERIFY( r.deallocate_calls == 0 );
+  }
+  VERIFY( r.deallocate_calls == r.allocate_calls );
+  VERIFY( r.number_of_active_allocations() == 0 );
+}
+
+int
+main()
+{
+  test01();
+}