New upstream version 8.1.0

thirdparty/source/boost_1_61_0/boost/mpl/distance.hpp

@@ -0,0 +1,78 @@
+
+#ifndef BOOST_MPL_DISTANCE_HPP_INCLUDED
+#define BOOST_MPL_DISTANCE_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id$
+// $Date$
+// $Revision$
+
+#include <boost/mpl/distance_fwd.hpp>
+#include <boost/mpl/iter_fold.hpp>
+#include <boost/mpl/iterator_range.hpp>
+#include <boost/mpl/long.hpp>
+#include <boost/mpl/next.hpp>
+#include <boost/mpl/tag.hpp>
+#include <boost/mpl/apply_wrap.hpp>
+#include <boost/mpl/aux_/msvc_eti_base.hpp>
+#include <boost/mpl/aux_/value_wknd.hpp>
+#include <boost/mpl/aux_/na_spec.hpp>
+#include <boost/mpl/aux_/config/forwarding.hpp>
+#include <boost/mpl/aux_/config/static_constant.hpp>
+
+
+namespace boost { namespace mpl {
+
+// default implementation for forward/bidirectional iterators
+template< typename Tag > struct distance_impl
+{
+    template< typename First, typename Last > struct apply
+#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
+        : aux::msvc_eti_base< typename iter_fold<
+              iterator_range<First,Last>
+            , mpl::long_<0>
+            , next<>
+            >::type >
+    {
+#else
+    {
+        typedef typename iter_fold<
+              iterator_range<First,Last>
+            , mpl::long_<0>
+            , next<>
+            >::type type;
+        
+        BOOST_STATIC_CONSTANT(long, value =
+              (iter_fold<
+                  iterator_range<First,Last>
+                , mpl::long_<0>
+                , next<>
+                >::type::value)
+            );
+#endif
+    };
+};
+
+template<
+      typename BOOST_MPL_AUX_NA_PARAM(First)
+    , typename BOOST_MPL_AUX_NA_PARAM(Last)
+    >
+struct distance
+    : distance_impl< typename tag<First>::type >
+        ::template apply<First, Last>
+{
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(2, distance, (First, Last))
+};
+
+BOOST_MPL_AUX_NA_SPEC(2, distance)
+
+}}
+
+#endif // BOOST_MPL_DISTANCE_HPP_INCLUDED