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// Copyright 2019 Hans Dembinski
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_HISTOGRAM_DETAIL_NONMEMBER_CONTAINER_ACCESS_HPP
#define BOOST_HISTOGRAM_DETAIL_NONMEMBER_CONTAINER_ACCESS_HPP
#if __cpp_lib_nonmember_container_access >= 201411
#include <iterator>
namespace boost {
namespace histogram {
namespace detail {
using std::data;
using std::size;
} // namespace detail
} // namespace histogram
} // namespace boost
#else // std implementations are not available
#include <initializer_list>
#include <type_traits>
namespace boost {
namespace histogram {
namespace detail {
template <class C>
constexpr auto data(C& c) -> decltype(c.data()) {
return c.data();
}
template <class C>
constexpr auto data(const C& c) -> decltype(c.data()) {
return c.data();
}
template <class T, std::size_t N>
constexpr T* data(T (&array)[N]) noexcept {
return array;
}
template <class E>
constexpr const E* data(std::initializer_list<E> il) noexcept {
return il.begin();
}
template <class C>
constexpr auto size(const C& c) -> decltype(c.size()) {
return c.size();
}
template <class T, std::size_t N>
constexpr std::size_t size(const T (&)[N]) noexcept {
return N;
}
} // namespace detail
} // namespace histogram
} // namespace boost
#endif
#endif // BOOST_HISTOGRAM_DETAIL_NONMEMBER_CONTAINER_ACCESS_HPP
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