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Avoid copying ManyToMany table results (#5923)

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Regardless of any copy elision on the returned pair value, the
duration and distance results are always copied.

Fix this by passing rvalue references to std::make_pair.
This commit is contained in:
Michael Bell
2021-01-04 16:46:51 +00:00
committed by GitHub
parent dddf83db7b
commit 58ba3fc84f
3 changed files with 10 additions and 8 deletions
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src/engine/routing_algorithms/many_to_many_ch.cpp
+1 -1
View File
@@ -248,7 +248,7 @@ manyToManySearch(SearchEngineData<ch::Algorithm> &engine_working_data,
}
}
return std::make_pair(durations_table, distances_table);
return std::make_pair(std::move(durations_table), std::move(distances_table));
}
} // namespace routing_algorithms
src/engine/routing_algorithms/many_to_many_mld.cpp
+7 -7
View File
@@ -219,8 +219,8 @@ oneToManySearch(SearchEngineData<Algorithm> &engine_working_data,
const std::vector<std::size_t> &phantom_indices,
const bool calculate_distance)
{
std::vector<EdgeWeight> weights(phantom_indices.size(), INVALID_EDGE_WEIGHT);
std::vector<EdgeDuration> durations(phantom_indices.size(), MAXIMAL_EDGE_DURATION);
std::vector<EdgeWeight> weights_table(phantom_indices.size(), INVALID_EDGE_WEIGHT);
std::vector<EdgeDuration> durations_table(phantom_indices.size(), MAXIMAL_EDGE_DURATION);
std::vector<EdgeDistance> distances_table(calculate_distance ? phantom_indices.size() : 0,
MAXIMAL_EDGE_DISTANCE);
std::vector<NodeID> middle_nodes_table(phantom_indices.size(), SPECIAL_NODEID);
@@ -298,10 +298,10 @@ oneToManySearch(SearchEngineData<Algorithm> &engine_working_data,
distances_table.empty() ? nulldistance : distances_table[index];
if (std::tie(path_weight, path_duration, path_distance) <
std::tie(weights[index], durations[index], current_distance))
std::tie(weights_table[index], durations_table[index], current_distance))
{
weights[index] = path_weight;
durations[index] = path_duration;
weights_table[index] = path_weight;
durations_table[index] = path_duration;
current_distance = path_distance;
middle_nodes_table[index] = node;
}
@@ -392,7 +392,7 @@ oneToManySearch(SearchEngineData<Algorithm> &engine_working_data,
facade, heapNode, query_heap, phantom_nodes, phantom_index, phantom_indices);
}
return std::make_pair(durations, distances_table);
return std::make_pair(std::move(durations_table), std::move(distances_table));
}
//
@@ -601,7 +601,7 @@ manyToManySearch(SearchEngineData<Algorithm> &engine_working_data,
}
}
return std::make_pair(durations_table, distances_table);
return std::make_pair(std::move(durations_table), std::move(distances_table));
}
} // namespace mld