Bundle Boost.Range (from 1.57.0).

boost/range/has_range_iterator.hpp

@@ -0,0 +1,83 @@
+// Boost.Range library
+//
+//  Copyright Neil Groves 2010. 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/
+//
+// Acknowledgments:
+// Ticket #8341: Arno Schoedl - improved handling of has_range_iterator upon
+// use-cases where T was const.
+#ifndef BOOST_RANGE_HAS_ITERATOR_HPP_INCLUDED
+#define BOOST_RANGE_HAS_ITERATOR_HPP_INCLUDED
+
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/has_xxx.hpp>
+#include <boost/range/iterator.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/utility/enable_if.hpp>
+
+namespace boost
+{
+    namespace range_detail
+    {
+        BOOST_MPL_HAS_XXX_TRAIT_DEF(type)
+
+        template<class T, class Enabler = void>
+        struct has_range_iterator_impl
+            : boost::mpl::false_
+        {
+        };
+
+        template<class T>
+        struct has_range_iterator_impl<
+            T,
+            BOOST_DEDUCED_TYPENAME ::boost::enable_if<
+                BOOST_DEDUCED_TYPENAME mpl::eval_if<is_const<T>,
+                    has_type<range_const_iterator<
+                                BOOST_DEDUCED_TYPENAME remove_const<T>::type> >,
+                    has_type<range_mutable_iterator<T> >
+                >::type
+            >::type
+        >
+            : boost::mpl::true_
+        {
+        };
+
+        template<class T, class Enabler = void>
+        struct has_range_const_iterator_impl
+            : boost::mpl::false_
+        {
+        };
+
+        template<class T>
+        struct has_range_const_iterator_impl<
+            T,
+            BOOST_DEDUCED_TYPENAME ::boost::enable_if<
+                has_type<range_const_iterator<T> >
+            >::type
+        >
+            : boost::mpl::true_
+        {
+        };
+
+    } // namespace range_detail
+
+    template<class T>
+    struct has_range_iterator
+        : range_detail::has_range_iterator_impl<
+            BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
+    {};
+
+    template<class T>
+    struct has_range_const_iterator
+        : range_detail::has_range_const_iterator_impl<
+            BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
+    {};
+} // namespace boost
+
+#endif // include guard
+