// Copyright 2020 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_REDUCE_COMMAND_HPP
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#define BOOST_HISTOGRAM_DETAIL_REDUCE_COMMAND_HPP
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#include <boost/histogram/detail/span.hpp>
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#include <boost/histogram/fwd.hpp>
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#include <boost/throw_exception.hpp>
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#include <cassert>
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#include <stdexcept>
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#include <string>
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namespace boost {
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namespace histogram {
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namespace detail {
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struct reduce_command {
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static constexpr unsigned unset = static_cast<unsigned>(-1);
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unsigned iaxis = unset;
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enum class range_t : char {
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none,
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indices,
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values,
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} range = range_t::none;
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union {
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axis::index_type index;
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double value;
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} begin{0}, end{0};
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unsigned merge = 0; // default value indicates unset option
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bool crop = false;
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// for internal use by the reduce algorithm
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bool is_ordered = true;
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bool use_underflow_bin = true;
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bool use_overflow_bin = true;
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};
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// - puts commands in correct axis order
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// - sets iaxis for positional commands
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// - detects and fails on invalid settings
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// - fuses merge commands with non-merge commands
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inline void normalize_reduce_commands(span<reduce_command> out,
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span<const reduce_command> in) {
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unsigned iaxis = 0;
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for (const auto& o_in : in) {
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assert(o_in.merge > 0);
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if (o_in.iaxis != reduce_command::unset && o_in.iaxis >= out.size())
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BOOST_THROW_EXCEPTION(std::invalid_argument("invalid axis index"));
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auto& o_out = out.begin()[o_in.iaxis == reduce_command::unset ? iaxis : o_in.iaxis];
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if (o_out.merge == 0) {
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o_out = o_in;
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} else {
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// Some command was already set for this axis, try to fuse commands.
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if (!((o_in.range == reduce_command::range_t::none) ^
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(o_out.range == reduce_command::range_t::none)) ||
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(o_out.merge > 1 && o_in.merge > 1))
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BOOST_THROW_EXCEPTION(std::invalid_argument(
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"multiple conflicting reduce commands for axis " +
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std::to_string(o_in.iaxis == reduce_command::unset ? iaxis : o_in.iaxis)));
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if (o_in.range != reduce_command::range_t::none) {
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o_out.range = o_in.range;
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o_out.begin = o_in.begin;
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o_out.end = o_in.end;
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} else {
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o_out.merge = o_in.merge;
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}
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}
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++iaxis;
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}
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iaxis = 0;
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for (auto& o : out) o.iaxis = iaxis++;
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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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