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make sure collapse only happens on valid indices

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This commit is contained in:
Moritz Kobitzsch 2016-09-05 12:41:33 +02:00
parent 7528b27f99
commit 47a6cd5462
1 changed files with 2 additions and 2 deletions
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4
src/engine/guidance/post_processing.cpp
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@ -832,8 +832,8 @@ std::vector<RouteStep> collapseTurns(std::vector<RouteStep> steps)
invalidateStep(steps[step_index]);
invalidateStep(steps[next_step_index]);
}
else if (choiceless(current_step, one_back_step) ||
one_back_step.distance <= MAX_COLLAPSE_DISTANCE)
else if (one_back_index > 0 && (choiceless(current_step, one_back_step) ||
one_back_step.distance <= MAX_COLLAPSE_DISTANCE))
{
// check for one of the multiple collapse scenarios and, if possible, collapse the
// turn