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-rw-r--r--src/core/kdtree.hpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/core/kdtree.hpp b/src/core/kdtree.hpp
index 392e31b8e..cb864e04d 100644
--- a/src/core/kdtree.hpp
+++ b/src/core/kdtree.hpp
@@ -274,7 +274,7 @@ class Kdtree {
}
template <typename Outputter>
- void FindContainedRecursive(CoordT p1[2], CoordT p2[2], size_t node_idx, int level, Outputter outputter) const
+ void FindContainedRecursive(CoordT p1[2], CoordT p2[2], size_t node_idx, int level, const Outputter &outputter) const
{
/* Dimension index of current level */
int dim = level % 2;
@@ -458,7 +458,7 @@ public:
* @param outputter Callback used to return values from the search.
*/
template <typename Outputter>
- void FindContained(CoordT x1, CoordT y1, CoordT x2, CoordT y2, Outputter outputter) const
+ void FindContained(CoordT x1, CoordT y1, CoordT x2, CoordT y2, const Outputter &outputter) const
{
assert(x1 < x2);
assert(y1 < y2);