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// 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.
// Copyright (c) 2020 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// 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 <type_traits>
#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>
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 std::conditional_t
<
boost::function_types::is_member_function_pointer<Method>::value,
std::integral_constant<int, 1>,
std::integral_constant<int, 0>
> base_index_type;
typedef std::conditional_t
<
Index == 0,
base_index_type,
std::integral_constant
<
int,
(base_index_type::value + Index)
>
> indexed_type;
typedef typename std::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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