[Boost-commit] svn:boost r68657 - trunk/boost/spirit/home/karma/detail

Subject: [Boost-commit] svn:boost r68657 - trunk/boost/spirit/home/karma/detail
From: hartmut.kaiser_at_[hidden]
Date: 2011-02-05 11:24:22

Author: hkaiser
Date: 2011-02-05 11:24:19 EST (Sat, 05 Feb 2011)
New Revision: 68657
URL: http://svn.boost.org/trac/boost/changeset/68657

Log:
Spirit: adding missing file
Added:
   trunk/boost/spirit/home/karma/detail/indirect_iterator.hpp   (contents, props changed)

Added: trunk/boost/spirit/home/karma/detail/indirect_iterator.hpp
==============================================================================
--- (empty file)
+++ trunk/boost/spirit/home/karma/detail/indirect_iterator.hpp	2011-02-05 11:24:19 EST (Sat, 05 Feb 2011)
@@ -0,0 +1,87 @@
+//  Copyright (c) 2001-2011 Hartmut Kaiser
+//
+//  Distributed under 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)
+
+#if !defined(SPIRIT_KARMA_INDIRECT_ITERATOR_JAN_19_2011_0814PM)
+#define SPIRIT_KARMA_INDIRECT_ITERATOR_JAN_19_2011_0814PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/support/unused.hpp>
+#include <boost/iterator/iterator_facade.hpp>
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost { namespace spirit { namespace karma { namespace detail
+{
+    ///////////////////////////////////////////////////////////////////////
+    // This is a wrapper for any iterator allowing to pass a reference of it
+    // to the components of the sequence
+    template <typename Iterator>
+    class indirect_iterator
+      : public boost::iterator_facade<
+            indirect_iterator<Iterator>
+          , typename boost::detail::iterator_traits<Iterator>::value_type
+          , boost::forward_traversal_tag
+          , typename boost::detail::iterator_traits<Iterator>::value_type const&>
+    {
+        typedef typename boost::detail::iterator_traits<Iterator>::value_type
+            base_value_type;
+
+        typedef boost::iterator_facade<
+            indirect_iterator<Iterator>, base_value_type
+          , boost::forward_traversal_tag, base_value_type const&
+        > base_type;
+
+    public:
+        indirect_iterator(Iterator& iter)
+          : iter_(&iter)
+        {}
+        indirect_iterator(indirect_iterator const& iter)
+          : iter_(iter.iter_)
+        {}
+
+    private:
+        friend class boost::iterator_core_access;
+
+        void increment()
+        {
+            ++*iter_;
+        }
+
+        bool equal(indirect_iterator const& other) const
+        {
+            return *iter_ == *other.iter_;
+        }
+
+        typename base_type::reference dereference() const
+        {
+            return **iter_;
+        }
+
+    private:
+        Iterator* iter_;
+    };
+
+    template <typename Iterator>
+    struct make_indirect_iterator
+    {
+        typedef indirect_iterator<Iterator> type;
+    };
+
+    template <typename Iterator>
+    struct make_indirect_iterator<indirect_iterator<Iterator> >
+    {
+        typedef indirect_iterator<Iterator> type;
+    };
+
+    template <>
+    struct make_indirect_iterator<unused_type const*>
+    {
+        typedef unused_type const* type;
+    };
+}}}}
+
+#endif