// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// Copyright (c) 2020 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_UTIL_PARAMETER_TYPE_OF_HPP
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#define BOOST_GEOMETRY_UTIL_PARAMETER_TYPE_OF_HPP
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#include <type_traits>
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#include <boost/function_types/function_arity.hpp>
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#include <boost/function_types/is_member_function_pointer.hpp>
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#include <boost/function_types/parameter_types.hpp>
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#include <boost/mpl/at.hpp>
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namespace boost { namespace geometry
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{
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/*!
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\brief Meta-function selecting a parameter type of a (member) function, by index
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\ingroup utility
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*/
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template <typename Method, std::size_t Index>
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struct parameter_type_of
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{
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typedef typename boost::function_types::parameter_types
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<
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Method
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>::type parameter_types;
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typedef std::conditional_t
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<
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boost::function_types::is_member_function_pointer<Method>::value,
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std::integral_constant<int, 1>,
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std::integral_constant<int, 0>
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> base_index_type;
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typedef std::conditional_t
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<
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Index == 0,
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base_index_type,
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std::integral_constant
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<
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int,
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(base_index_type::value + Index)
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>
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> indexed_type;
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typedef typename std::remove_reference
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<
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typename boost::mpl::at
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<
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parameter_types,
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indexed_type
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>::type
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>::type type;
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};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_UTIL_PARAMETER_TYPE_OF_HPP
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