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-rw-r--r--common/algorithm.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/common/algorithm.h b/common/algorithm.h
index d6790afbe9..7a0eed89ce 100644
--- a/common/algorithm.h
+++ b/common/algorithm.h
@@ -100,7 +100,7 @@ char *fill(char *first, char *last, Value val) {
* Sets all elements in the range [first, last) to val.
*/
template<class In, class Value>
-In fill(In first, In last, Value val) {
+In fill(In first, In last, const Value &val) {
while (first != last)
*first++ = val;
return first;