// 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_NONMEMBER_CONTAINER_ACCESS_HPP
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#define BOOST_HISTOGRAM_DETAIL_NONMEMBER_CONTAINER_ACCESS_HPP
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#if __cpp_lib_nonmember_container_access >= 201411
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#include <iterator>
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namespace boost {
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namespace histogram {
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namespace detail {
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using std::data;
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using std::size;
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} // namespace detail
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} // namespace histogram
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} // namespace boost
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#else // std implementations are not available
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#include <initializer_list>
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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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template <class C>
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constexpr auto data(C& c) -> decltype(c.data()) {
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return c.data();
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}
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template <class C>
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constexpr auto data(const C& c) -> decltype(c.data()) {
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return c.data();
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}
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template <class T, std::size_t N>
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constexpr T* data(T (&array)[N]) noexcept {
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return array;
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}
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template <class E>
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constexpr const E* data(std::initializer_list<E> il) noexcept {
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return il.begin();
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}
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template <class C>
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constexpr auto size(const C& c) -> decltype(c.size()) {
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return c.size();
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}
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template <class T, std::size_t N>
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constexpr std::size_t size(const T (&)[N]) noexcept {
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return N;
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}
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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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#endif // BOOST_HISTOGRAM_DETAIL_NONMEMBER_CONTAINER_ACCESS_HPP
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