mirror of https://github.com/CGAL/cgal
57 lines
1.8 KiB
C++
57 lines
1.8 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); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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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 <iterator>
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#include <boost/type_traits.hpp>
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#include <boost/mpl/has_xxx.hpp>
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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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template <class T> struct is_iterator_ {
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enum { value = has_iterator_category<T>::value
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|| boost::is_pointer<T>::value };
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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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enum { value=false };
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};
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template <class T,class U> struct is_iterator_type_<T,U,true> :
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//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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}
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// NOTE: we don't want the real std::decay or functions are included
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template <class T> struct is_iterator :
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internal::is_iterator_<typename boost::remove_cv<typename boost::remove_reference<T>::type>::type> {};
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template <class T,class Tag> struct is_iterator_type :
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internal::is_iterator_type_<typename boost::remove_cv<typename boost::remove_reference<T>::type>::type,Tag> {};
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}
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#endif // CGAL_IS_ITERATOR_H
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