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