[Boost-commit] svn:boost r69990 - sandbox/assign_v2/boost/assign/v2/utility/chain

Subject: [Boost-commit] svn:boost r69990 - sandbox/assign_v2/boost/assign/v2/utility/chain
From: erwann.rogard_at_[hidden]
Date: 2011-03-14 19:29:51

Author: e_r
Date: 2011-03-14 19:29:46 EDT (Mon, 14 Mar 2011)
New Revision: 69990
URL: http://svn.boost.org/trac/boost/changeset/69990

Log:
upd assign_v2
Added:
   sandbox/assign_v2/boost/assign/v2/utility/chain/meta.hpp   (contents, props changed)

Added: sandbox/assign_v2/boost/assign/v2/utility/chain/meta.hpp
==============================================================================
--- (empty file)
+++ sandbox/assign_v2/boost/assign/v2/utility/chain/meta.hpp	2011-03-14 19:29:46 EDT (Mon, 14 Mar 2011)
@@ -0,0 +1,110 @@
+//////////////////////////////////////////////////////////////////////////////
+//  Boost.Assign v2                                                         //
+//                                                                          //
+//  Copyright (C) 2003-2004 Thorsten Ottosen                                //
+//  Copyright (C) 2010 Erwann Rogard                                        //
+//  Use, modification and distribution are 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)        //
+//////////////////////////////////////////////////////////////////////////////
+#ifndef BOOST_ASSIGN_V2_CHAIN_META_ER_2010_HPP
+#define BOOST_ASSIGN_V2_CHAIN_META_ER_2010_HPP
+#include <boost/assign/v2/utility/chain/iterator.hpp>
+#include <boost/config.hpp>
+#include <boost/concept/assert.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/range/iterator_range.hpp>
+#include <boost/range/iterator.hpp>
+#include <boost/range/reference.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/is_reference.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+namespace boost{
+    struct use_default;
+namespace assign{
+namespace v2{
+namespace chain_aux{
+
+    template<typename R1, typename R2, template<typename> class F, typename Tag>
+    struct range{
+
+        typedef typename chain_aux::iterator<
+            typename F<R1>::type,
+            typename F<R2>::type,
+            Tag
+        >::type iterator_t;
+        typedef boost::iterator_range< iterator_t > type;
+
+        static type call(R1& r1, R2& r2)
+        {
+            BOOST_CONCEPT_ASSERT((SinglePassRangeConcept<R1>));
+            BOOST_CONCEPT_ASSERT((SinglePassRangeConcept<R2>));
+            namespace ns = boost::range_detail;
+            typedef ns::join_iterator_begin_tag begin_tag_;
+            typedef ns::join_iterator_end_tag end_tag_;
+            return type(
+                iterator_t(r1, r2, begin_tag_()),
+                iterator_t(r1, r2, end_tag_())
+            );
+        }
+    };
+
+    template<typename R1, typename R2, typename Tag>
+    struct range_l
+        : chain_aux::range< R1, R2, boost::range_iterator,Tag>{};
+
+    template<typename R1, typename R2, typename Tag>
+    struct range_r
+        : chain_aux::range<R1, R2, boost::range_const_iterator,Tag>{};
+
+    // Use-const
+    template<typename U1, typename U2,
+        bool is_r = boost::is_reference<U1>::value,
+        bool is_c = boost::is_const<
+            typename boost::remove_reference<U1>::type
+        >::value
+    >
+    struct dont_use_const_impl : ::boost::mpl::false_{};
+
+    template<typename U>
+    struct dont_use_const_impl<U, U, true, false> : ::boost::mpl::true_{};
+
+    template<typename R1, typename R2, typename Tag = use_default>
+    struct dont_use_const : dont_use_const_impl<
+        typename boost::range_reference<R1>::type,
+        typename boost::range_reference<R2>::type
+    >{};
+
+    template<typename R1, typename R2, typename Tag = use_default>
+    struct use_const : ::boost::mpl::bool_<
+        !dont_use_const<R1, R2, Tag>::value
+    >{};
+    
+    // Result
+    template<typename R1, typename R2, typename Tag = use_default>
+    struct result{
+        typedef typename  ::boost::mpl::eval_if<
+            chain_aux::use_const<R1, R2, Tag>,
+            ::boost::mpl::identity< chain_aux::range_r<R1, R2, Tag> >,
+            ::boost::mpl::identity< chain_aux::range_l<R1, R2, Tag> >
+        >::type caller_;
+
+        typedef typename caller_::type type;
+
+        static type call(R1& r1, R2& r2)
+        {
+            return caller_::call( r1, r2 );
+        }
+    };
+
+}// chain_aux
+}// v2
+}// assign
+}// boost
+
+#endif // BOOST_ASSIGN_V2_CHAIN_RESULT_ER_2010_HPP