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Editing: parameter_type_of.hpp
// 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_PARAMETER_TYPE_OF_HPP #define BOOST_GEOMETRY_UTIL_PARAMETER_TYPE_OF_HPP #include <boost/function_types/function_arity.hpp> #include <boost/function_types/is_member_function_pointer.hpp> #include <boost/function_types/parameter_types.hpp> #include <boost/mpl/at.hpp> #include <boost/mpl/int.hpp> #include <boost/mpl/plus.hpp> #include <boost/type_traits/remove_reference.hpp> namespace boost { namespace geometry { /*! \brief Meta-function selecting a parameter type of a (member) function, by index \ingroup utility */ template <typename Method, std::size_t Index> struct parameter_type_of { typedef typename boost::function_types::parameter_types < Method >::type parameter_types; typedef typename boost::mpl::if_ < boost::function_types::is_member_function_pointer<Method>, boost::mpl::int_<1>, boost::mpl::int_<0> >::type base_index_type; typedef typename boost::mpl::if_c < Index == 0, base_index_type, typename boost::mpl::plus < base_index_type, boost::mpl::int_<Index> >::type >::type indexed_type; typedef typename boost::remove_reference < typename boost::mpl::at < parameter_types, indexed_type >::type >::type type; }; }} // namespace boost::geometry #endif // BOOST_GEOMETRY_UTIL_PARAMETER_TYPE_OF_HPP
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