Chris@16: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@16: 
Chris@16: // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
Chris@16: // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
Chris@16: // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
Chris@16: 
Chris@16: // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
Chris@16: // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software License,
Chris@16: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP
Chris@16: #define BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP
Chris@16: 
Chris@16: 
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: 
Chris@16: 
Chris@16: namespace boost { namespace geometry
Chris@16: {
Chris@16: 
Chris@16: 
Chris@16: /*!
Chris@16:     \brief Meta-function to define a const or non const type
Chris@16:     \ingroup utility
Chris@16:     \details If the boolean template parameter is true, the type parameter
Chris@16:         will be defined as const, otherwise it will be defined as it was.
Chris@16:         This meta-function is used to have one implementation for both
Chris@16:         const and non const references
Chris@16:     \note This traits class is completely independant from Boost.Geometry
Chris@16:         and might be a separate addition to Boost
Chris@16:     \note Used in a.o. for_each, interior_rings, exterior_ring
Chris@16:     \par Example
Chris@16:     \code
Chris@16:         void foo(typename add_const_if_c<IsConst, Point>::type& point)
Chris@16:     \endcode
Chris@16: */
Chris@16: template <bool IsConst, typename Type>
Chris@16: struct add_const_if_c
Chris@16: {
Chris@16:     typedef typename boost::mpl::if_c
Chris@16:         <
Chris@16:             IsConst,
Chris@16:             Type const,
Chris@16:             Type
Chris@16:         >::type type;
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: 
Chris@16: }} // namespace boost::geometry
Chris@16: 
Chris@16: 
Chris@16: #endif // BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP