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https://github.com/PurpleI2P/Boost-for-Android-Prebuilt
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49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// 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_AT_HPP
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#define BOOST_HISTOGRAM_DETAIL_AT_HPP
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#include <boost/histogram/axis/option.hpp>
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#include <boost/histogram/axis/traits.hpp>
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#include <boost/histogram/detail/axes.hpp>
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#include <boost/histogram/detail/linearize.hpp>
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#include <boost/histogram/fwd.hpp>
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#include <boost/mp11/algorithm.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 A, class... Us>
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optional_index at(const A& axes, const std::tuple<Us...>& args) noexcept {
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optional_index idx{0}; // offset not used by linearize_index
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mp11::mp_for_each<mp11::mp_iota_c<sizeof...(Us)>>(
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[&, stride = static_cast<std::size_t>(1)](auto i) mutable {
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stride *= linearize_index(idx, stride, axis_get<i>(axes),
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static_cast<axis::index_type>(std::get<i>(args)));
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});
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return idx;
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}
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template <class A, class U>
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optional_index at(const A& axes, const U& args) noexcept {
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optional_index idx{0};
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using std::begin;
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for_each_axis(axes, [&, it = begin(args),
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stride = static_cast<std::size_t>(1)](const auto& a) mutable {
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stride *= linearize_index(idx, stride, a, static_cast<axis::index_type>(*it++));
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});
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return idx;
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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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