--- boost/iterator/filter_iterator.hpp	2014-05-28 15:44:43.000000000 +0300
+++ boost/iterator/filter_iterator.hpp	2014-05-28 15:44:46.000000000 +0300
@@ -53,7 +53,7 @@
    public:
       filter_iterator() { }
 
-      filter_iterator(Predicate f, Iterator x, Iterator end_ = Iterator())
+      filter_iterator(const Predicate f, Iterator x, Iterator end_ = Iterator())
           : super_t(x), m_predicate(f), m_end(end_)
       {
           satisfy_predicate();
@@ -109,7 +109,7 @@
 
   template <class Predicate, class Iterator>
   filter_iterator<Predicate,Iterator>
-  make_filter_iterator(Predicate f, Iterator x, Iterator end = Iterator())
+  make_filter_iterator(const Predicate f, Iterator x, Iterator end = Iterator())
   {
       return filter_iterator<Predicate,Iterator>(f,x,end);
   }