// Copyright 2015-2018 Hans Dembinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_HISTOGRAM_DETAIL_ARGS_TYPE_HPP
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#define BOOST_HISTOGRAM_DETAIL_ARGS_TYPE_HPP
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#include <tuple>
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namespace boost {
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namespace histogram {
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namespace detail {
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template <class T>
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struct args_type_impl {
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using T::ERROR_this_should_never_be_instantiated_please_write_an_issue;
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};
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template <class R, class T, class... Ts>
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struct args_type_impl<R (T::*)(Ts...)> {
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using type = std::tuple<Ts...>;
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};
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template <class R, class T, class... Ts>
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struct args_type_impl<R (T ::*)(Ts...) const> {
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using type = std::tuple<Ts...>;
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};
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template <class R, class... Ts>
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struct args_type_impl<R (*)(Ts...)> {
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using type = std::tuple<Ts...>;
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};
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#if __cpp_noexcept_function_type >= 201510
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template <class R, class T, class... Ts>
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struct args_type_impl<R (T::*)(Ts...) noexcept> {
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using type = std::tuple<Ts...>;
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};
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template <class R, class T, class... Ts>
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struct args_type_impl<R (T ::*)(Ts...) const noexcept> {
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using type = std::tuple<Ts...>;
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};
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template <class R, class... Ts>
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struct args_type_impl<R (*)(Ts...) noexcept> {
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using type = std::tuple<Ts...>;
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};
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#endif
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template <class FunctionPointer>
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using args_type = typename args_type_impl<FunctionPointer>::type;
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template <class T, std::size_t N = 0>
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using arg_type = std::tuple_element_t<N, args_type<T>>;
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} // namespace detail
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} // namespace histogram
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} // namespace boost
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#endif
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