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-rw-r--r--extractor/binary_search_merger.cc6
1 files changed, 4 insertions, 2 deletions
diff --git a/extractor/binary_search_merger.cc b/extractor/binary_search_merger.cc
index 43d2f734..c1b86a77 100644
--- a/extractor/binary_search_merger.cc
+++ b/extractor/binary_search_merger.cc
@@ -25,8 +25,10 @@ BinarySearchMerger::~BinarySearchMerger() {}
void BinarySearchMerger::Merge(
vector<int>& locations, const Phrase& phrase, const Phrase& suffix,
- vector<int>::iterator prefix_start, vector<int>::iterator prefix_end,
- vector<int>::iterator suffix_start, vector<int>::iterator suffix_end,
+ const vector<int>::iterator& prefix_start,
+ const vector<int>::iterator& prefix_end,
+ const vector<int>::iterator& suffix_start,
+ const vector<int>::iterator& suffix_end,
int prefix_subpatterns, int suffix_subpatterns) const {
if (IsIntersectionVoid(prefix_start, prefix_end, suffix_start, suffix_end,
prefix_subpatterns, suffix_subpatterns, suffix)) {