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path: root/src/mbgl/text/collision_index.cpp
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-rw-r--r--src/mbgl/text/collision_index.cpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/mbgl/text/collision_index.cpp b/src/mbgl/text/collision_index.cpp
index 0447886166..20cb6514b6 100644
--- a/src/mbgl/text/collision_index.cpp
+++ b/src/mbgl/text/collision_index.cpp
@@ -126,7 +126,7 @@ std::pair<bool, bool> CollisionIndex::placeFeature(
const bool pitchWithMap,
const bool collisionDebug,
const optional<CollisionBoundaries>& avoidEdges,
- const optional<std::function<bool(const IndexedSubfeature&)>> collisionGroupPredicate,
+ const optional<std::function<bool(const IndexedSubfeature&)>>& collisionGroupPredicate,
std::vector<ProjectedCollisionBox>& projectedBoxes) {
assert(projectedBoxes.empty());
if (!feature.alongLine) {
@@ -157,7 +157,7 @@ std::pair<bool, bool> CollisionIndex::placeLineFeature(
const bool pitchWithMap,
const bool collisionDebug,
const optional<CollisionBoundaries>& avoidEdges,
- const optional<std::function<bool(const IndexedSubfeature&)>> collisionGroupPredicate,
+ const optional<std::function<bool(const IndexedSubfeature&)>>& collisionGroupPredicate,
std::vector<ProjectedCollisionBox>& projectedBoxes) {
assert(feature.alongLine);
assert(projectedBoxes.empty());