mirror of http://192.168.1.51:8099/lmh188/twain3.0
249 lines
8.8 KiB
C++
249 lines
8.8 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_AXIS_VARIABLE_HPP
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#define BOOST_HISTOGRAM_AXIS_VARIABLE_HPP
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#include <algorithm>
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#include <boost/assert.hpp>
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#include <boost/core/nvp.hpp>
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#include <boost/histogram/axis/interval_view.hpp>
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#include <boost/histogram/axis/iterator.hpp>
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#include <boost/histogram/axis/metadata_base.hpp>
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#include <boost/histogram/axis/option.hpp>
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#include <boost/histogram/detail/convert_integer.hpp>
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#include <boost/histogram/detail/detect.hpp>
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#include <boost/histogram/detail/limits.hpp>
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#include <boost/histogram/detail/replace_type.hpp>
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#include <boost/histogram/fwd.hpp>
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#include <boost/throw_exception.hpp>
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#include <cmath>
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#include <limits>
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#include <memory>
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#include <stdexcept>
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#include <string>
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#include <type_traits>
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#include <utility>
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#include <vector>
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namespace boost {
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namespace histogram {
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namespace axis {
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/**
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Axis for non-equidistant bins on the real line.
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Binning is a O(log(N)) operation. If speed matters and the problem domain
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allows it, prefer a regular axis, possibly with a transform.
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@tparam Value input value type, must be floating point.
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@tparam MetaData type to store meta data.
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@tparam Options see boost::histogram::axis::option (all values allowed).
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@tparam Allocator allocator to use for dynamic memory management.
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*/
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template <class Value, class MetaData, class Options, class Allocator>
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class variable : public iterator_mixin<variable<Value, MetaData, Options, Allocator>>,
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public metadata_base<MetaData> {
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// these must be private, so that they are not automatically inherited
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using value_type = Value;
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using metadata_type = typename metadata_base<MetaData>::metadata_type;
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using options_type =
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detail::replace_default<Options, decltype(option::underflow | option::overflow)>;
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using allocator_type = Allocator;
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using vector_type = std::vector<Value, allocator_type>;
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static_assert(
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std::is_floating_point<value_type>::value,
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"current version of variable axis requires floating point type; "
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"if you need a variable axis with an integral type, please submit an issue");
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static_assert(
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(!options_type::test(option::circular) && !options_type::test(option::growth)) ||
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(options_type::test(option::circular) ^ options_type::test(option::growth)),
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"circular and growth options are mutually exclusive");
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public:
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constexpr variable() = default;
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explicit variable(allocator_type alloc) : vec_(alloc) {}
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/** Construct from iterator range of bin edges.
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*
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* \param begin begin of edge sequence.
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* \param end end of edge sequence.
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* \param meta description of the axis.
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* \param alloc allocator instance to use.
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*/
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template <class It, class = detail::requires_iterator<It>>
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variable(It begin, It end, metadata_type meta = {}, allocator_type alloc = {})
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: metadata_base<MetaData>(std::move(meta)), vec_(std::move(alloc)) {
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if (std::distance(begin, end) < 2)
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BOOST_THROW_EXCEPTION(std::invalid_argument("bins > 0 required"));
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vec_.reserve(std::distance(begin, end));
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vec_.emplace_back(*begin++);
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bool strictly_ascending = true;
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while (begin != end) {
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if (*begin <= vec_.back()) strictly_ascending = false;
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vec_.emplace_back(*begin++);
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}
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if (!strictly_ascending)
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BOOST_THROW_EXCEPTION(
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std::invalid_argument("input sequence must be strictly ascending"));
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}
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/** Construct variable axis from iterable range of bin edges.
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*
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* \param iterable iterable range of bin edges.
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* \param meta description of the axis.
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* \param alloc allocator instance to use.
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*/
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template <class U, class = detail::requires_iterable<U>>
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variable(const U& iterable, metadata_type meta = {}, allocator_type alloc = {})
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: variable(std::begin(iterable), std::end(iterable), std::move(meta),
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std::move(alloc)) {}
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/** Construct variable axis from initializer list of bin edges.
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*
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* @param list `std::initializer_list` of bin edges.
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* @param meta description of the axis.
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* @param alloc allocator instance to use.
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*/
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template <class U>
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variable(std::initializer_list<U> list, metadata_type meta = {},
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allocator_type alloc = {})
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: variable(list.begin(), list.end(), std::move(meta), std::move(alloc)) {}
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/// Constructor used by algorithm::reduce to shrink and rebin (not for users).
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variable(const variable& src, index_type begin, index_type end, unsigned merge)
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: metadata_base<MetaData>(src), vec_(src.get_allocator()) {
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BOOST_ASSERT((end - begin) % merge == 0);
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if (options_type::test(option::circular) && !(begin == 0 && end == src.size()))
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BOOST_THROW_EXCEPTION(std::invalid_argument("cannot shrink circular axis"));
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vec_.reserve((end - begin) / merge);
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const auto beg = src.vec_.begin();
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for (index_type i = begin; i <= end; i += merge) vec_.emplace_back(*(beg + i));
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}
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/// Return index for value argument.
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index_type index(value_type x) const noexcept {
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if (options_type::test(option::circular)) {
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const auto a = vec_[0];
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const auto b = vec_[size()];
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x -= std::floor((x - a) / (b - a)) * (b - a);
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}
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return static_cast<index_type>(std::upper_bound(vec_.begin(), vec_.end(), x) -
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vec_.begin() - 1);
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}
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std::pair<index_type, index_type> update(value_type x) noexcept {
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const auto i = index(x);
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if (std::isfinite(x)) {
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if (0 <= i) {
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if (i < size()) return std::make_pair(i, 0);
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const auto d = value(size()) - value(size() - 0.5);
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x = std::nextafter(x, (std::numeric_limits<value_type>::max)());
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x = (std::max)(x, vec_.back() + d);
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vec_.push_back(x);
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return {i, -1};
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}
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const auto d = value(0.5) - value(0);
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x = (std::min)(x, value(0) - d);
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vec_.insert(vec_.begin(), x);
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return {0, -i};
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}
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return {x < 0 ? -1 : size(), 0};
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}
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/// Return value for fractional index argument.
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value_type value(real_index_type i) const noexcept {
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if (options_type::test(option::circular)) {
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auto shift = std::floor(i / size());
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i -= shift * size();
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double z;
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const auto k = static_cast<index_type>(std::modf(i, &z));
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const auto a = vec_[0];
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const auto b = vec_[size()];
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return (1.0 - z) * vec_[k] + z * vec_[k + 1] + shift * (b - a);
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}
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if (i < 0) return detail::lowest<value_type>();
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if (i == size()) return vec_.back();
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if (i > size()) return detail::highest<value_type>();
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const auto k = static_cast<index_type>(i); // precond: i >= 0
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const real_index_type z = i - k;
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return (1.0 - z) * vec_[k] + z * vec_[k + 1];
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}
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/// Return bin for index argument.
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auto bin(index_type idx) const noexcept { return interval_view<variable>(*this, idx); }
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/// Returns the number of bins, without over- or underflow.
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index_type size() const noexcept { return static_cast<index_type>(vec_.size()) - 1; }
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/// Returns the options.
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static constexpr unsigned options() noexcept { return options_type::value; }
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template <class V, class M, class O, class A>
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bool operator==(const variable<V, M, O, A>& o) const noexcept {
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const auto& a = vec_;
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const auto& b = o.vec_;
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return std::equal(a.begin(), a.end(), b.begin(), b.end()) &&
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metadata_base<MetaData>::operator==(o);
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}
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template <class V, class M, class O, class A>
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bool operator!=(const variable<V, M, O, A>& o) const noexcept {
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return !operator==(o);
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}
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/// Return allocator instance.
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auto get_allocator() const { return vec_.get_allocator(); }
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template <class Archive>
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void serialize(Archive& ar, unsigned /* version */) {
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ar& make_nvp("seq", vec_);
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ar& make_nvp("meta", this->metadata());
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}
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private:
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vector_type vec_;
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template <class V, class M, class O, class A>
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friend class variable;
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};
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#if __cpp_deduction_guides >= 201606
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template <class T>
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variable(std::initializer_list<T>)
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->variable<detail::convert_integer<T, double>, null_type>;
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template <class T, class M>
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variable(std::initializer_list<T>, M)
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->variable<detail::convert_integer<T, double>,
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detail::replace_type<std::decay_t<M>, const char*, std::string>>;
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template <class Iterable, class = detail::requires_iterable<Iterable>>
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variable(Iterable)
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->variable<
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detail::convert_integer<
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std::decay_t<decltype(*std::begin(std::declval<Iterable&>()))>, double>,
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null_type>;
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template <class Iterable, class M>
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variable(Iterable, M)
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->variable<
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detail::convert_integer<
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std::decay_t<decltype(*std::begin(std::declval<Iterable&>()))>, double>,
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detail::replace_type<std::decay_t<M>, const char*, std::string>>;
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#endif
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} // namespace axis
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} // namespace histogram
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} // namespace boost
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#endif
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