trac 6685 - MFC range map adaptor.

2014-03-04 13:33:59 +00:00
parent b84385cfce
commit 194f357eeb
3 changed files with 129 additions and 0 deletions
--- a/include/boost/range/mfc_map.hpp
+++ b/include/boost/range/mfc_map.hpp
@ -0,0 +1,114 @@
+// Boost.Range library
+//
+//  Copyright Adam D. Walling 2012. 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_ADAPTOR_MFC_MAP_HPP
+#define BOOST_RANGE_ADAPTOR_MFC_MAP_HPP
+
+#if !defined(BOOST_RANGE_MFC_NO_CPAIR)
+
+#include <boost/range/mfc.hpp>
+#include <boost/range/adaptor/map.hpp>
+
+namespace boost
+{
+    namespace range_detail
+    {
+        // CMap and CMapStringToString range iterators return CPair,
+        // which has a key and value member. Other MFC range iterators
+        // already return adapted std::pair objects. This allows usage
+        // of the map_keys and map_values range adaptors with CMap 
+        // and CMapStringToString
+        
+        // CPair has a VALUE value member, and a KEY key member; we will
+        // use VALUE& as the result_type consistent with CMap::operator[]
+        
+        // specialization for CMap 
+        template<class KEY, class ARG_KEY, class VALUE, class ARG_VALUE>
+        struct select_first< CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> >
+        {
+            typedef BOOST_DEDUCED_TYPENAME CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> map_type;
+            typedef BOOST_DEDUCED_TYPENAME range_reference<const map_type>::type argument_type;
+            typedef BOOST_DEDUCED_TYPENAME const KEY& result_type;
+
+            result_type operator()( argument_type r ) const
+            {
+                return r.key;
+            }
+        };
+
+        template<class KEY, class ARG_KEY, class VALUE, class ARG_VALUE>
+        struct select_second_mutable< CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> >
+        {
+            typedef BOOST_DEDUCED_TYPENAME CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> map_type;
+            typedef BOOST_DEDUCED_TYPENAME range_reference<map_type>::type argument_type;
+            typedef BOOST_DEDUCED_TYPENAME VALUE& result_type;
+
+            result_type operator()( argument_type r ) const
+            {
+                return r.value;
+            }
+        };
+
+        template<class KEY, class ARG_KEY, class VALUE, class ARG_VALUE>
+        struct select_second_const< CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> >
+        {
+            typedef BOOST_DEDUCED_TYPENAME CMap<KEY, ARG_KEY, VALUE, ARG_VALUE> map_type;
+            typedef BOOST_DEDUCED_TYPENAME range_reference<const map_type>::type argument_type;
+            typedef BOOST_DEDUCED_TYPENAME const VALUE& result_type;
+
+            result_type operator()( argument_type r ) const
+            {
+                return r.value;
+            }
+        };
+
+
+        // specialization for CMapStringToString
+        template<>
+        struct select_first< CMapStringToString >
+        {
+            typedef range_reference<const CMapStringToString>::type argument_type;
+            typedef const CString& result_type;
+
+            result_type operator()( argument_type r ) const
+            {
+                return r.key;
+            }
+        };
+
+        template<>
+        struct select_second_mutable< CMapStringToString >
+        {
+            typedef range_reference<CMapStringToString>::type argument_type;
+            typedef CString& result_type;
+
+            result_type operator()( argument_type r ) const
+            {
+                return r.value;
+            }
+        };
+
+        template<>
+        struct select_second_const< CMapStringToString >
+        {
+            typedef range_reference<const CMapStringToString>::type argument_type;
+            typedef const CString& result_type;
+
+            result_type operator()( argument_type r ) const
+            {
+                return r.value;
+            }
+        };
+    } // 'range_detail'
+} // 'boost'
+
+#endif // !defined(BOOST_RANGE_MFC_NO_CPAIR)
+
+#endif