mirror of https://github.com/CGAL/cgal
85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
// Copyright (c) 2025 GeometryFactory Sarl (France).
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Laurent Rineau
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#ifndef CGAL_UNORDERED_FLAT_MAP_H
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#define CGAL_UNORDERED_FLAT_MAP_H
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#include <CGAL/config.h>
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#include <boost/version.hpp>
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#if BOOST_VERSION >= 108100 && !defined(CGAL_USE_BOOST_UNORDERED)
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# define CGAL_USE_BOOST_UNORDERED 1
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#endif
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#if CGAL_USE_BARE_STD_SET
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# define CGAL_USE_BARE_STD_MAP CGAL_USE_BARE_STD_SET
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#endif
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#if CGAL_USE_BARE_STD_MAP // to benchmark with the ordered std::map
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# include <map>
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# include <set>
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#elif CGAL_USE_BOOST_UNORDERED
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# include <boost/unordered/unordered_flat_map.hpp>
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# include <boost/unordered/unordered_flat_set.hpp>
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#else // Boost before 1.81.0, use the C++11 std::unordered_map
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# include <boost/unordered_map.hpp>
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# include <boost/unordered_set.hpp>
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#endif
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#include <functional> // for std::hash, std::equal_to
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#include <memory> // for std::allocator
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namespace CGAL {
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template <
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typename Key,
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typename T,
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typename Hash = std::hash<Key>,
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typename KeyEqual = std::equal_to<Key>,
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typename Allocator = std::allocator<std::pair<const Key, T>>
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>
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#if CGAL_USE_BARE_STD_MAP
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using unordered_flat_map = std::map<Key, T, std::less<Key>, Allocator>;
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#elif CGAL_USE_BOOST_UNORDERED
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using unordered_flat_map = boost::unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>;
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#else // use the Boost implementation of C++11 std::unordered_map (for noexcept)
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using unordered_flat_map = boost::unordered_map<Key, T, Hash, KeyEqual, Allocator>;
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#endif
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template <
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typename Key,
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typename Hash = std::hash<Key>,
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typename KeyEqual = std::equal_to<Key>,
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typename Allocator = std::allocator<Key>
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>
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#if CGAL_USE_BARE_STD_MAP
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using unordered_flat_set = std::set<Key, std::less<Key>, Allocator>;
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#elif CGAL_USE_BOOST_UNORDERED
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using unordered_flat_set = boost::unordered_flat_set<Key, Hash, KeyEqual, Allocator>;
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#else // use the Boost implementation of C++11 std::unordered_set (for noexcept)
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using unordered_flat_set = boost::unordered_set<Key, Hash, KeyEqual, Allocator>;
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#endif
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} // end namespace CGAL
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#endif // CGAL_UNORDERED_FLAT_MAP_H
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