mirror of https://github.com/CGAL/cgal
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
// Copyright (c) 2014 GeometryFactory (France). All rights reserved.
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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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//
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// Author(s) : Andreas Fabri
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#ifndef CGAL_CONTAINER_HELPER_H
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#define CGAL_CONTAINER_HELPER_H
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#include <CGAL/array.h>
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#include <CGAL/Has_member.h>
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#include <CGAL/assertions.h>
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#include <boost/mpl/logical.hpp>
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#include <cstddef>
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#include<type_traits>
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namespace CGAL {
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namespace internal {
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CGAL_GENERATE_MEMBER_DETECTOR(size);
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CGAL_GENERATE_MEMBER_DETECTOR(resize);
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// Typical container
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template <class Container>
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void resize(Container& c, std::size_t size,
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std::enable_if_t<has_resize<Container>::value>* = nullptr)
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{
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c.resize(size);
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}
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// Container without a resize() function, but with a size() function (e.g. an array)
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template <class Container>
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void resize(Container& CGAL_assertion_code(array), std::size_t CGAL_assertion_code(size),
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std::enable_if_t<!has_resize<Container>::value &&
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has_size<Container>::value >* = nullptr)
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{
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CGAL_assertion(array.size() == size);
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}
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// A class with neither resize() nor size(), can't enforce size (it better be correct!)
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template <class Container>
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void resize(Container&, std::size_t,
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std::enable_if_t<
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!(has_resize<Container>::value ||
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has_size<Container>::value)>* = nullptr)
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{
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}
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// Plenty of times we ask for a model of RandomAccessContainer and use reserve, but some models
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// of the concept do not have a reserve (e.g. deque)
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CGAL_GENERATE_MEMBER_DETECTOR(reserve);
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// Container with 'reserve'
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template <class Container>
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void reserve(Container& c, std::size_t size,
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std::enable_if_t<has_reserve<Container>::value>* = nullptr)
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{
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c.reserve(size);
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}
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// Container with no 'reserve'
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template <class Container>
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void reserve(Container&, std::size_t,
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std::enable_if_t<!has_reserve<Container>::value>* = nullptr)
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{
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}
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} // namespace internal
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} // namespace CGAL
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#endif // CGAL_CONTAINER_HELPER_H
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