// Copyright (c) 2016-2020 Antony Polukhin
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PFR_TUPLE_SIZE_HPP
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#define BOOST_PFR_TUPLE_SIZE_HPP
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#pragma once
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#include <boost/pfr/detail/config.hpp>
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#include <type_traits>
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#include <utility> // metaprogramming stuff
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#include <boost/pfr/detail/sequence_tuple.hpp>
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#include <boost/pfr/detail/fields_count.hpp>
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/// \file boost/pfr/tuple_size.hpp
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/// Contains tuple-like interfaces to get fields count \forcedlink{tuple_size}, \forcedlink{tuple_size_v}.
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///
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/// \b Synopsis:
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namespace boost { namespace pfr {
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/// Has a static const member variable `value` that contains fields count in a T.
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/// Works for any T that supports aggregate initialization.
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///
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/// \b Example:
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/// \code
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/// std::array<int, boost::pfr::tuple_size<my_structure>::value > a;
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/// \endcode
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template <class T>
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using tuple_size = detail::size_t_< boost::pfr::detail::fields_count<T>() >;
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/// `tuple_size_v` is a template variable that contains fields count in a T and
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/// works for any T that supports aggregate initialization.
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///
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/// \b Example:
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/// \code
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/// std::array<int, boost::pfr::tuple_size_v<my_structure> > a;
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/// \endcode
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template <class T>
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constexpr std::size_t tuple_size_v = tuple_size<T>::value;
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}} // namespace boost::pfr
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#endif // BOOST_PFR_TUPLE_SIZE_HPP
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