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