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-rw-r--r--src/prevector.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/prevector.h b/src/prevector.h
index dc17e7ce4b..02d860bb00 100644
--- a/src/prevector.h
+++ b/src/prevector.h
@@ -132,7 +132,7 @@ public:
typedef const T* pointer;
typedef const T& reference;
typedef std::bidirectional_iterator_tag iterator_category;
- const_reverse_iterator(T* ptr_) : ptr(ptr_) {}
+ const_reverse_iterator(const T* ptr_) : ptr(ptr_) {}
const_reverse_iterator(reverse_iterator x) : ptr(&(*x)) {}
const T& operator*() const { return *ptr; }
const T* operator->() const { return ptr; }