// Boost.Range library
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//
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// Copyright Thorsten Ottosen 2003-2004. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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#ifndef BOOST_RANGE_DETAIL_DIFFERENCE_TYPE_HPP
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#define BOOST_RANGE_DETAIL_DIFFERENCE_TYPE_HPP
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#include <boost/range/detail/common.hpp>
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#include <boost/iterator/iterator_traits.hpp>
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//////////////////////////////////////////////////////////////////////////////
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// missing partial specialization workaround.
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//////////////////////////////////////////////////////////////////////////////
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namespace boost
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{
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namespace range_detail
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{
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template< typename T >
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struct range_difference_type_;
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template<>
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struct range_difference_type_<std_container_>
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{
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template< typename C >
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struct pts
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{
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typedef BOOST_DEDUCED_TYPENAME C::difference_type type;
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};
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};
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template<>
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struct range_difference_type_<std_pair_>
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{
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template< typename P >
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struct pts
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{
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typedef BOOST_RANGE_DEDUCED_TYPENAME boost::iterator_difference< BOOST_DEDUCED_TYPENAME P::first_type>::type type;
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};
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};
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template<>
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struct range_difference_type_<array_>
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{
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template< typename A >
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struct pts
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{
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typedef std::ptrdiff_t type;
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};
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};
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template<>
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struct range_difference_type_<char_array_>
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{
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template< typename A >
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struct pts
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{
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typedef std::ptrdiff_t type;
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};
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};
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template<>
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struct range_difference_type_<char_ptr_>
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{
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template< typename S >
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struct pts
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{
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typedef std::ptrdiff_t type;
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};
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};
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template<>
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struct range_difference_type_<const_char_ptr_>
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{
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template< typename S >
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struct pts
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{
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typedef std::ptrdiff_t type;
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};
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};
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template<>
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struct range_difference_type_<wchar_t_ptr_>
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{
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template< typename S >
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struct pts
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{
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typedef std::ptrdiff_t type;
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};
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};
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template<>
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struct range_difference_type_<const_wchar_t_ptr_>
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{
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template< typename S >
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struct pts
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{
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typedef std::ptrdiff_t type;
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};
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};
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}
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template< typename C >
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class range_difference
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{
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typedef BOOST_RANGE_DEDUCED_TYPENAME range_detail::range<C>::type c_type;
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public:
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typedef BOOST_RANGE_DEDUCED_TYPENAME range_detail::range_difference_type_<c_type>::BOOST_NESTED_TEMPLATE pts<C>::type type;
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};
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}
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#endif
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