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Make edge metrics strongly typed (#6421)

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This change takes the existing typedefs for weight, duration and
distance, and makes them proper types, using the existing Alias
functionality.

Primarily this is to prevent bugs where the metrics are switched,
but it also adds additional documentation. For example, it now
makes it clear (despite the naming of variables) that most of the
trip algorithm is running on the duration metric.

I've not made any changes to the casts performed between metrics
and numeric types, they now just more explicit.
This commit is contained in:
Michael Bell
2022-10-28 15:16:12 +01:00
committed by GitHub
parent 16685d0de9
commit 5d468f2897
69 changed files with 922 additions and 686 deletions
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include/engine/guidance/assemble_steps.hpp
+18 -17
View File
@@ -52,7 +52,7 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
const constexpr char *NO_ROTARY_NAME = "";
const EdgeWeight source_weight =
source_traversed_in_reverse ? source_node.reverse_weight : source_node.forward_weight;
const EdgeWeight source_duration =
const EdgeDuration source_duration =
source_traversed_in_reverse ? source_node.reverse_duration : source_node.forward_duration;
const auto source_node_id = source_traversed_in_reverse ? source_node.reverse_segment_id.id
: source_node.forward_segment_id.id;
@@ -61,7 +61,7 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
const auto source_mode = facade.GetTravelMode(source_node_id);
auto source_classes = facade.GetClasses(facade.GetClassData(source_node_id));
const EdgeWeight target_duration =
const EdgeDuration target_duration =
target_traversed_in_reverse ? target_node.reverse_duration : target_node.forward_duration;
const EdgeWeight target_weight =
target_traversed_in_reverse ? target_node.reverse_weight : target_node.forward_weight;
@@ -103,8 +103,8 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
// but a RouteStep is with regard to the segment after the turn.
// We need to skip the first segment because it is already covered by the
// initial start of a route
EdgeWeight segment_duration = 0;
EdgeWeight segment_weight = 0;
EdgeDuration segment_duration = {0};
EdgeWeight segment_weight = {0};
// some name changes are not announced in our processing. For these, we have to keep the
// first name on the segment
@@ -121,7 +121,7 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
: osrm::guidance::TurnInstruction::NO_TURN();
if (turn_instruction.type != osrm::guidance::TurnType::NoTurn)
{
BOOST_ASSERT(segment_weight >= 0);
BOOST_ASSERT(segment_weight >= EdgeWeight{0});
const auto name = facade.GetNameForID(step_name_id);
const auto ref = facade.GetRefForID(step_name_id);
const auto pronunciation = facade.GetPronunciationForID(step_name_id);
@@ -147,9 +147,9 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
exits.to_string(),
NO_ROTARY_NAME,
NO_ROTARY_NAME,
segment_duration / 10.,
from_alias<double>(segment_duration) / 10.,
distance,
segment_weight / weight_multiplier,
from_alias<double>(segment_weight) / weight_multiplier,
travel_mode,
maneuver,
leg_geometry.FrontIndex(segment_index),
@@ -228,16 +228,16 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
WaypointType::None,
0};
segment_index++;
segment_duration = 0;
segment_weight = 0;
segment_duration = {0};
segment_weight = {0};
}
}
const auto distance = leg_geometry.segment_distances[segment_index];
const EdgeWeight duration = segment_duration + target_duration;
const EdgeDuration duration = segment_duration + target_duration;
const EdgeWeight weight = segment_weight + target_weight;
// intersections contain the classes of exiting road
intersection.classes = facade.GetClasses(facade.GetClassData(target_node_id));
BOOST_ASSERT(duration >= 0);
BOOST_ASSERT(duration >= EdgeDuration{0});
steps.push_back(RouteStep{leg_data[leg_data.size() - 1].from_edge_based_node,
step_name_id,
is_segregated,
@@ -248,9 +248,9 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
facade.GetExitsForID(step_name_id).to_string(),
NO_ROTARY_NAME,
NO_ROTARY_NAME,
duration / 10.,
from_alias<double>(duration) / 10.,
distance,
weight / weight_multiplier,
from_alias<double>(weight) / weight_multiplier,
target_mode,
maneuver,
leg_geometry.FrontIndex(segment_index),
@@ -280,8 +280,9 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
// use rectified linear unit function to avoid negative duration values
// due to flooring errors in phantom snapping
BOOST_ASSERT(target_duration >= source_duration || weight == 0);
const EdgeWeight duration = std::max(0, target_duration - source_duration);
BOOST_ASSERT(target_duration >= source_duration || weight == EdgeWeight{0});
const EdgeDuration duration =
std::max<EdgeDuration>({0}, target_duration - source_duration);
steps.push_back(RouteStep{source_node_id,
source_name_id,
@@ -293,9 +294,9 @@ inline std::vector<RouteStep> assembleSteps(const datafacade::BaseDataFacade &fa
facade.GetExitsForID(source_name_id).to_string(),
NO_ROTARY_NAME,
NO_ROTARY_NAME,
duration / 10.,
from_alias<double>(duration) / 10.,
leg_geometry.segment_distances[segment_index],
weight / weight_multiplier,
from_alias<double>(weight) / weight_multiplier,
source_mode,
maneuver,
leg_geometry.FrontIndex(segment_index),