+// 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_SIZE_TYPE_HPP
+#define BOOST_RANGE_SIZE_TYPE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <boost/range/config.hpp>
+#include <boost/range/difference_type.hpp>
+#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+#include <boost/range/detail/size_type.hpp>
+#else
+
+#include <boost/utility/enable_if.hpp>
+#include <boost/type_traits/make_unsigned.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <cstddef>
+#include <utility>
+
+namespace boost
+{
+ namespace detail
+ {
+
+ //////////////////////////////////////////////////////////////////////////
+ // default
+ //////////////////////////////////////////////////////////////////////////
+
+ template<typename T>
+ class has_size_type
+ {
+ typedef char no_type;
+ struct yes_type { char dummy[2]; };
+
+ template<typename C>
+ static yes_type test(BOOST_DEDUCED_TYPENAME C::size_type x);
+
+ template<typename C, typename Arg>
+ static no_type test(Arg x);
+
+ public:
+ static const bool value = sizeof(test<T>(0)) == sizeof(yes_type);
+ };
+
+ template<typename C, typename Enabler=void>
+ struct range_size
+ {
+ typedef BOOST_DEDUCED_TYPENAME make_unsigned<
+ BOOST_DEDUCED_TYPENAME range_difference<C>::type
+ >::type type;
+ };
+
+ template<typename C>
+ struct range_size<
+ C,
+ BOOST_DEDUCED_TYPENAME enable_if<has_size_type<C>, void>::type
+ >
+ {
+ typedef BOOST_DEDUCED_TYPENAME C::size_type type;
+ };
+
+ }
+
+ template< class T >
+ struct range_size :
+ detail::range_size<T>
+ { };
+
+ template< class T >
+ struct range_size<const T >
+ : detail::range_size<T>
+ { };
+
+} // namespace boost
+
+#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+
+#endif