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82f76b0947
The presence of a plain reference prohibits the bound_view class from being copyable. The trick employed to work around that was to use 'placement new' for copy-assigning bound_view objects, but this approach is ill-formed and causes undefined behaviour for classes that have const and/or reference members. The solution is to use a std::reference_wrapper instead. Signed-off-by: Vladimir Krivopalov <vladimir@scylladb.com> Message-Id: <a0c951649c7aef2f66612fc006c44f8a33713931.1530113273.git.vladimir@scylladb.com>
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
/*
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* Copyright (C) 2016 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "range_tombstone.hh"
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#include "mutation_fragment.hh"
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std::ostream& operator<<(std::ostream& out, const range_tombstone& rt) {
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if (rt) {
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return out << "{range_tombstone: start=" << rt.start_bound() << ", end=" << rt.end_bound() << ", " << rt.tomb << "}";
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} else {
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return out << "{range_tombstone: none}";
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}
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}
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stdx::optional<range_tombstone> range_tombstone::apply(const schema& s, range_tombstone&& src)
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{
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bound_view::compare cmp(s);
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if (tomb == src.tomb) {
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if (cmp(end_bound(), src.end_bound())) {
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end = std::move(src.end);
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end_kind = src.end_kind;
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}
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return { };
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}
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if (tomb < src.tomb) {
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std::swap(*this, src);
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}
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if (cmp(end_bound(), src.end_bound())) {
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return range_tombstone(end, invert_kind(end_kind), std::move(src.end), src.end_kind, src.tomb);
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}
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return { };
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}
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position_in_partition_view range_tombstone::position() const {
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return position_in_partition_view(position_in_partition_view::range_tombstone_tag_t(), start_bound());
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}
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position_in_partition_view range_tombstone::end_position() const {
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return position_in_partition_view(position_in_partition_view::range_tombstone_tag_t(), end_bound());
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}
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void range_tombstone_accumulator::update_current_tombstone() {
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_current_tombstone = boost::accumulate(_range_tombstones, _partition_tombstone, [] (tombstone t, const range_tombstone& rt) {
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t.apply(rt.tomb);
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return t;
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});
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}
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void range_tombstone_accumulator::drop_unneeded_tombstones(const clustering_key_prefix& ck, int w) {
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auto cmp = [&] (const range_tombstone& rt, const clustering_key_prefix& ck, int w) {
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if (_reversed) {
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auto bv = rt.start_bound();
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return _cmp(ck, w, bv.prefix(), weight(bv.kind()));
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}
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auto bv = rt.end_bound();
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return _cmp(bv.prefix(), weight(bv.kind()), ck, w);
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};
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while (!_range_tombstones.empty() && cmp(*_range_tombstones.begin(), ck, w)) {
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_range_tombstones.pop_front();
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}
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update_current_tombstone();
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}
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void range_tombstone_accumulator::apply(range_tombstone rt) {
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if (_reversed) {
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drop_unneeded_tombstones(rt.end, weight(rt.end_kind));
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} else {
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drop_unneeded_tombstones(rt.start, weight(rt.start_kind));
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}
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_current_tombstone.apply(rt.tomb);
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auto cmp = [&] (const range_tombstone& rt1, const range_tombstone& rt2) {
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return _reversed ? _cmp(rt2.start_bound(), rt1.start_bound()) : _cmp(rt1.end_bound(), rt2.end_bound());
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};
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_range_tombstones.insert(boost::upper_bound(_range_tombstones, rt, cmp), std::move(rt));
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}
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void range_tombstone_accumulator::clear() {
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_range_tombstones.clear();
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_partition_tombstone = { };
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_current_tombstone = { };
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}
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