整理

include/boost/range/const_iterator.hpp

@@ -0,0 +1,76 @@
+// 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_CONST_ITERATOR_HPP
+#define BOOST_RANGE_CONST_ITERATOR_HPP
+
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+#include <boost/range/config.hpp>
+
+#include <boost/range/range_fwd.hpp>
+#include <boost/range/detail/extract_optional_type.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <cstddef>
+#include <utility>
+
+namespace boost
+{
+    //////////////////////////////////////////////////////////////////////////
+    // default
+    //////////////////////////////////////////////////////////////////////////
+    
+    namespace range_detail
+    {
+
+BOOST_RANGE_EXTRACT_OPTIONAL_TYPE( const_iterator )
+
+template< typename C >
+struct range_const_iterator_helper
+        : extract_const_iterator<C>
+{};
+
+//////////////////////////////////////////////////////////////////////////
+// pair
+//////////////////////////////////////////////////////////////////////////
+
+template< typename Iterator >
+struct range_const_iterator_helper<std::pair<Iterator,Iterator> >
+{
+    typedef Iterator type;
+};
+
+//////////////////////////////////////////////////////////////////////////
+// array
+//////////////////////////////////////////////////////////////////////////
+
+template< typename T, std::size_t sz >
+struct range_const_iterator_helper< T[sz] >
+{
+    typedef const T* type;
+};
+
+    } // namespace range_detail
+
+template<typename C, typename Enabler=void>
+struct range_const_iterator
+        : range_detail::range_const_iterator_helper<
+            BOOST_DEDUCED_TYPENAME remove_reference<C>::type
+        >
+{
+};
+
+} // namespace boost
+
+
+#endif