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Handle all distances between coordinates being zero in Farthest Insertion algorithm.

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Assertions for additional safety and sanity.

References:
- see https://github.com/Project-OSRM/osrm-backend/issues/2147
This commit is contained in:
Daniel J. Hofmann 2016-03-30 16:28:10 +02:00 committed by Patrick Niklaus
parent 3044c5ea52
commit a1b87b5236
1 changed files with 14 additions and 1 deletions
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15
include/engine/trip/trip_farthest_insertion.hpp
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@ -3,6 +3,7 @@
#include "engine/search_engine.hpp"
#include "util/dist_table_wrapper.hpp"
#include "util/typedefs.hpp"
#include "osrm/json_container.hpp"
#include <boost/assert.hpp>
@ -152,6 +153,13 @@ std::vector<NodeID> FarthestInsertionTrip(const NodeIDIterator &start,
// 5. DONE!
//////////////////////////////////////////////////////////////////////////////////////////////////
// Guard against division-by-zero in the code path below.
BOOST_ASSERT(number_of_locations > 0);
// Guard against dist_table being empty therefore max_element returning the end iterator.
BOOST_ASSERT(dist_table.size() > 0);
const auto component_size = std::distance(start, end);
BOOST_ASSERT(component_size >= 0);
@ -169,12 +177,16 @@ std::vector<NodeID> FarthestInsertionTrip(const NodeIDIterator &start,
}
else
{
auto max_dist = 0;
auto max_dist = std::numeric_limits<EdgeWeight>::min();
for (auto x = start; x != end; ++x)
{
for (auto y = start; y != end; ++y)
{
const auto xy_dist = dist_table(*x, *y);
// SCC decomposition done correctly?
BOOST_ASSERT(xy_dist != INVALID_EDGE_WEIGHT);
if (xy_dist > max_dist)
{
max_dist = xy_dist;
@ -184,6 +196,7 @@ std::vector<NodeID> FarthestInsertionTrip(const NodeIDIterator &start,
}
}
}
BOOST_ASSERT(max_from >= 0);
BOOST_ASSERT(max_to >= 0);
BOOST_ASSERT_MSG(static_cast<std::size_t>(max_from) < number_of_locations, "start node");