38 lines
956 B
C++
38 lines
956 B
C++
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// Copyright 2019 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_RELAXED_TUPLE_SIZE_HPP
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#define BOOST_HISTOGRAM_DETAIL_RELAXED_TUPLE_SIZE_HPP
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#include <type_traits>
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namespace boost {
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namespace histogram {
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namespace detail {
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using dynamic_size = std::integral_constant<std::size_t, static_cast<std::size_t>(-1)>;
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// Returns static size of tuple or dynamic_size
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template <class T>
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constexpr dynamic_size relaxed_tuple_size(const T&) noexcept {
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return {};
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}
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template <class... Ts>
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constexpr std::integral_constant<std::size_t, sizeof...(Ts)> relaxed_tuple_size(
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const std::tuple<Ts...>&) noexcept {
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return {};
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}
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template <class T>
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using relaxed_tuple_size_t = decltype(relaxed_tuple_size(std::declval<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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