/*
Userspace Virtual Filesystem

Copyright (C) 2015 Sebastian Herbord. All rights reserved.

This file is part of usvfs.

usvfs 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 of the License, or
(at your option) any later version.

usvfs 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 usvfs. If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

namespace bi = boost::interprocess;
namespace bc = boost::container;

namespace usvfs::shared
{

template <typename T>
using OffsetPtrT = bi::offset_ptr<T, std::int32_t, std::uint64_t>;

using VoidPointerT = OffsetPtrT<void>;

// important: the windows shared memory mechanism, unlike other implementations,
// automatically removes the SHM object when there are no more "subscribers".
// MO currently depends on that feature!

// managed_windows_shared_memory apparently doesn't support sharing between
// 64bit and 32bit processes
using managed_windows_shared_memory = bi::basic_managed_windows_shared_memory<
    char, bi::rbtree_best_fit<bi::mutex_family, VoidPointerT, 8>, bi::iset_index>;

using SharedMemoryT   = managed_windows_shared_memory;
using SegmentManagerT = SharedMemoryT::segment_manager;

using VoidAllocatorT = boost::container::scoped_allocator_adaptor<
    boost::interprocess::allocator<void, SegmentManagerT>>;
using CharAllocatorT = VoidAllocatorT::rebind<char>::other;

using StringT = bc::basic_string<char, std::char_traits<char>, CharAllocatorT>;

}  // namespace usvfs::shared