Added boost header

test/external/boost/geometry/util/add_const_if_c.hpp

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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2011 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2011 Mateusz Loskot, London, UK.
+
+// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
+// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
+
+// 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)
+
+#ifndef BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP
+#define BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP
+
+
+#include <boost/mpl/if.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+
+/*!
+    \brief Meta-function to define a const or non const type
+    \ingroup utility
+    \details If the boolean template parameter is true, the type parameter
+        will be defined as const, otherwise it will be defined as it was.
+        This meta-function is used to have one implementation for both
+        const and non const references
+    \note This traits class is completely independant from Boost.Geometry
+        and might be a separate addition to Boost
+    \note Used in a.o. for_each, interior_rings, exterior_ring
+    \par Example
+    \code
+        void foo(typename add_const_if_c<IsConst, Point>::type& point)
+    \endcode
+*/
+template <bool IsConst, typename Type>
+struct add_const_if_c
+{
+    typedef typename boost::mpl::if_c
+        <
+            IsConst,
+            Type const,
+            Type
+        >::type type;
+};
+
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP