1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556 |
- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
- // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
- // Copyright (c) 2009-2012 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
|