63e88f80
 Hu Chunming
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// Copyright 2020 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_MULTI_INDEX_HPP
#define BOOST_HISTOGRAM_MULTI_INDEX_HPP
#include <algorithm>
#include <boost/histogram/detail/detect.hpp>
#include <boost/histogram/detail/nonmember_container_access.hpp>
#include <boost/histogram/fwd.hpp>
#include <boost/mp11/integer_sequence.hpp>
#include <boost/throw_exception.hpp>
#include <initializer_list>
#include <iterator>
#include <stdexcept>
#include <tuple>
namespace boost {
namespace histogram {
/** Holder for multiple axis indices.
Adapts external iterable, tuple, or explicit list of indices to the same representation.
*/
template <std::size_t Size>
struct multi_index {
using value_type = axis::index_type;
using iterator = value_type*;
using const_iterator = const value_type*;
static multi_index create(std::size_t s) {
if (s != size())
BOOST_THROW_EXCEPTION(std::invalid_argument("size does not match static size"));
return multi_index(priv_tag{});
}
template <class... Is>
multi_index(axis::index_type i, Is... is)
: multi_index(std::initializer_list<axis::index_type>{
i, static_cast<axis::index_type>(is)...}) {}
template <class... Is>
multi_index(const std::tuple<axis::index_type, Is...>& is)
: multi_index(is, mp11::make_index_sequence<(1 + sizeof...(Is))>{}) {}
template <class Iterable, class = detail::requires_iterable<Iterable>>
multi_index(const Iterable& is) {
if (detail::size(is) != size())
BOOST_THROW_EXCEPTION(std::invalid_argument("no. of axes != no. of indices"));
using std::begin;
using std::end;
std::copy(begin(is), end(is), data_);
}
iterator begin() noexcept { return data_; }
iterator end() noexcept { return data_ + size(); }
const_iterator begin() const noexcept { return data_; }
const_iterator end() const noexcept { return data_ + size(); }
static constexpr std::size_t size() noexcept { return Size; }
private:
struct priv_tag {};
multi_index(priv_tag) {}
template <class T, std::size_t... Is>
multi_index(const T& is, mp11::index_sequence<Is...>)
: multi_index(static_cast<axis::index_type>(std::get<Is>(is))...) {}
axis::index_type data_[size()];
};
template <>
struct multi_index<static_cast<std::size_t>(-1)> {
using value_type = axis::index_type;
using iterator = value_type*;
using const_iterator = const value_type*;
static multi_index create(std::size_t s) { return multi_index(priv_tag{}, s); }
template <class... Is>
multi_index(axis::index_type i, Is... is)
: multi_index(std::initializer_list<axis::index_type>{
i, static_cast<axis::index_type>(is)...}) {}
template <class... Is>
multi_index(const std::tuple<axis::index_type, Is...>& is)
: multi_index(is, mp11::make_index_sequence<(1 + sizeof...(Is))>{}) {}
template <class Iterable, class = detail::requires_iterable<Iterable>>
multi_index(const Iterable& is) : size_(detail::size(is)) {
using std::begin;
using std::end;
std::copy(begin(is), end(is), data_);
}
iterator begin() noexcept { return data_; }
iterator end() noexcept { return data_ + size_; }
const_iterator begin() const noexcept { return data_; }
const_iterator end() const noexcept { return data_ + size_; }
std::size_t size() const noexcept { return size_; }
private:
struct priv_tag {};
multi_index(priv_tag, std::size_t s) : size_(s) {}
template <class T, std::size_t... Ns>
multi_index(const T& is, mp11::index_sequence<Ns...>)
: multi_index(static_cast<axis::index_type>(std::get<Ns>(is))...) {}
std::size_t size_ = 0;
static constexpr std::size_t max_size_ = BOOST_HISTOGRAM_DETAIL_AXES_LIMIT;
axis::index_type data_[max_size_];
};
} // namespace histogram
} // namespace boost
#endif
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