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use constexpr if

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This commit is contained in:
Siarhei Fedartsou 2024-05-21 20:10:27 +02:00
parent ee7dcbbb5b
commit 7e2fd63f0a
1 changed files with 36 additions and 46 deletions
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82
include/engine/routing_algorithms/routing_base_mld.hpp
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@ -532,22 +532,19 @@ using UnpackedNodes = std::vector<NodeID>;
using UnpackedEdges = std::vector<EdgeID>;
using UnpackedPath = std::tuple<EdgeWeight, UnpackedNodes, UnpackedEdges>;
template <typename Algorithm, typename... Args>
UnpackedPath search(SearchEngineData<Algorithm> &engine_working_data,
const DataFacade<Algorithm> &facade,
typename SearchEngineData<Algorithm>::QueryHeap &forward_heap,
typename SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
const std::vector<NodeID> &force_step_nodes,
EdgeWeight weight_upper_bound,
const Args &...args)
template <typename Algorithm, typename Heap, typename... Args>
std::optional<std::pair<NodeID, EdgeWeight>> runSearch(const DataFacade<Algorithm> &facade,
Heap &forward_heap,
Heap &reverse_heap,
const std::vector<NodeID> &force_step_nodes,
EdgeWeight weight_upper_bound,
const Args &...args)
{
if (forward_heap.Empty() || reverse_heap.Empty())
{
return std::make_tuple(INVALID_EDGE_WEIGHT, std::vector<NodeID>(), std::vector<EdgeID>());
return {};
}
const auto &partition = facade.GetMultiLevelPartition();
BOOST_ASSERT(!forward_heap.Empty() && forward_heap.MinKey() < INVALID_EDGE_WEIGHT);
BOOST_ASSERT(!reverse_heap.Empty() && reverse_heap.MinKey() < INVALID_EDGE_WEIGHT);
@ -577,10 +574,33 @@ UnpackedPath search(SearchEngineData<Algorithm> &engine_working_data,
// No path found for both target nodes?
if (weight >= weight_upper_bound || SPECIAL_NODEID == middle)
{
return {};
}
return {{middle, weight}};
}
template <typename Algorithm, typename... Args>
UnpackedPath search(SearchEngineData<Algorithm> &engine_working_data,
const DataFacade<Algorithm> &facade,
typename SearchEngineData<Algorithm>::QueryHeap &forward_heap,
typename SearchEngineData<Algorithm>::QueryHeap &reverse_heap,
const std::vector<NodeID> &force_step_nodes,
EdgeWeight weight_upper_bound,
const Args &...args)
{
auto searchResult = runSearch(
facade, forward_heap, reverse_heap, force_step_nodes, weight_upper_bound, args...);
if (!searchResult)
{
return std::make_tuple(INVALID_EDGE_WEIGHT, std::vector<NodeID>(), std::vector<EdgeID>());
}
auto [middle, weight] = *searchResult;
const auto &partition = facade.GetMultiLevelPartition();
// std::cerr << "Distance = " << forward_heap.GetData(middle).distance << " " <<
// reverse_heap.GetData(middle).distance << std::endl;
@ -652,45 +672,15 @@ searchDistance(SearchEngineData<Algorithm> &,
EdgeWeight weight_upper_bound,
const Args &...args)
{
if (forward_heap.Empty() || reverse_heap.Empty())
auto searchResult = runSearch(
facade, forward_heap, reverse_heap, force_step_nodes, weight_upper_bound, args...);
if (!searchResult)
{
return INVALID_EDGE_DISTANCE;
}
// const auto &partition = facade.GetMultiLevelPartition();
BOOST_ASSERT(!forward_heap.Empty() && forward_heap.MinKey() < INVALID_EDGE_WEIGHT);
BOOST_ASSERT(!reverse_heap.Empty() && reverse_heap.MinKey() < INVALID_EDGE_WEIGHT);
// run two-Target Dijkstra routing step.
NodeID middle = SPECIAL_NODEID;
EdgeWeight weight = weight_upper_bound;
EdgeWeight forward_heap_min = forward_heap.MinKey();
EdgeWeight reverse_heap_min = reverse_heap.MinKey();
while (forward_heap.Size() + reverse_heap.Size() > 0 &&
forward_heap_min + reverse_heap_min < weight)
{
if (!forward_heap.Empty())
{
routingStep<FORWARD_DIRECTION>(
facade, forward_heap, reverse_heap, middle, weight, force_step_nodes, args...);
if (!forward_heap.Empty())
forward_heap_min = forward_heap.MinKey();
}
if (!reverse_heap.Empty())
{
routingStep<REVERSE_DIRECTION>(
facade, reverse_heap, forward_heap, middle, weight, force_step_nodes, args...);
if (!reverse_heap.Empty())
reverse_heap_min = reverse_heap.MinKey();
}
};
// No path found for both target nodes?
if (weight >= weight_upper_bound || SPECIAL_NODEID == middle)
{
return INVALID_EDGE_DISTANCE;
}
auto [middle, _] = *searchResult;
auto distance = forward_heap.GetData(middle).distance + reverse_heap.GetData(middle).distance;