Review all associative containers and implement a different constructor overload to avoid any unnecessary copy construction of the predicate or the allocator.

test/set_test.cpp

@@ -318,7 +318,6 @@ void test_merge_from_different_comparison()
    set1.merge(set2);
 }
 
-
 int main ()
 {
    //Recursive container instantiation
@@ -345,6 +344,9 @@ int main ()
       s.emplace(p);
    }
 
+   if (!boost::container::test::instantiate_constructors<set<int>, multiset<int> >())
+      return 1;
+
    test_merge_from_different_comparison();
 
    ////////////////////////////////////