mirror of https://github.com/CGAL/cgal
89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
// Copyright (c) 2011 INRIA Saclay Ile-de-France (France).
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// All rights reserved.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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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) : Marc Glisse
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#ifndef CGAL_IS_ITERATOR_H
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#define CGAL_IS_ITERATOR_H
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/type_traits/is_pointer.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/mpl/has_xxx.hpp>
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#include <boost/mpl/logical.hpp>
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#include <iterator>
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namespace CGAL {
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namespace internal {
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BOOST_MPL_HAS_XXX_TRAIT_DEF(iterator_category)
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BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type)
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BOOST_MPL_HAS_XXX_TRAIT_DEF(difference_type)
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BOOST_MPL_HAS_XXX_TRAIT_DEF(pointer)
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BOOST_MPL_HAS_XXX_TRAIT_DEF(reference)
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//We request the type to be either a pointer or to
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//provide all 5 nested types provided by iterator_traits
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template <class T>
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struct is_iterator_
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: public boost::mpl::or_<
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boost::mpl::and_<
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has_iterator_category<T>,
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has_value_type<T>,
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has_difference_type<T>,
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has_pointer<T>,
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has_reference<T> >,
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boost::is_pointer<T> >
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{ };
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template <class T, class U, bool = is_iterator_<T>::value>
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struct is_iterator_type_
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: public boost::mpl::false_
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{ };
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template <class T,class U>
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struct is_iterator_type_<T, U, true>
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: public //boost::is_base_of<U,typename std::iterator_traits<T>::iterator_category>
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boost::is_convertible<typename std::iterator_traits<T>::iterator_category, U>
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{ };
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} // namespace internal
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// NOTE: we don't want the real std::decay or functions are included
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template <class T>
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struct is_iterator
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: public internal::is_iterator_<typename boost::remove_cv<typename boost::remove_reference<T>::type>::type>
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{ };
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template <class T, class Tag>
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struct is_iterator_type
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: public internal::is_iterator_type_<typename boost::remove_cv<typename boost::remove_reference<T>::type>::type, Tag>
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{ };
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template <class T, class U, bool = is_iterator<T>::value>
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struct is_iterator_to
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: public boost::mpl::false_
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{ };
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template <class T, class U>
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struct is_iterator_to<T, U, true>
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: public boost::is_convertible<typename std::iterator_traits<T>::value_type, U>
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{ };
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} // namespace CGAL
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#endif // CGAL_IS_ITERATOR_H
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