99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
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// Copyright Hans Dembinski 2020
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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_BOOLEAN_HPP
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#define BOOST_HISTOGRAM_AXIS_BOOLEAN_HPP
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#include <boost/core/nvp.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/relaxed_equal.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 <string>
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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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Discrete axis for boolean data.
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Binning is a pass-though operation with zero cost, making this the
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fastest possible axis. The axis has no internal state apart from the
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optional metadata state. The axis has no under- and overflow bins.
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It cannot grow and cannot be reduced.
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@tparam MetaData type to store meta data.
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*/
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template <class MetaData>
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class boolean : public iterator_mixin<boolean<MetaData>>,
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public metadata_base_t<MetaData> {
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using value_type = bool;
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using metadata_base = metadata_base_t<MetaData>;
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using metadata_type = typename metadata_base::metadata_type;
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public:
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/** Construct a boolean axis.
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*
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* @param meta description of the axis.
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*/
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explicit boolean(metadata_type meta = {}) : metadata_base(std::move(meta)) {}
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/// Return index for value argument.
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index_type index(value_type x) const noexcept { return static_cast<index_type>(x); }
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/// Return value for index argument.
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value_type value(index_type i) const noexcept { return static_cast<value_type>(i); }
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/// Return bin for index argument.
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value_type bin(index_type i) const noexcept { return value(i); }
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/// Returns the number of bins, without over- or underflow.
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index_type size() const noexcept { return 2; }
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/// Whether the axis is inclusive (see axis::traits::is_inclusive).
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static constexpr bool inclusive() noexcept { return true; }
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/// Returns the options.
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static constexpr unsigned options() noexcept { return option::none_t::value; }
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template <class M>
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bool operator==(const boolean<M>& o) const noexcept {
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return detail::relaxed_equal{}(this->metadata(), o.metadata());
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}
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template <class M>
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bool operator!=(const boolean<M>& o) const noexcept {
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return !operator==(o);
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}
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template <class Archive>
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void serialize(Archive& ar, unsigned /* version */) {
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ar& make_nvp("meta", this->metadata());
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}
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private:
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template <class M>
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friend class boolean;
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};
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#if __cpp_deduction_guides >= 201606
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boolean()->boolean<null_type>;
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template <class M>
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boolean(M) -> boolean<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 // BOOST_HISTOGRAM_AXIS_BOOLEAN_HPP
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