Use custom hash functions as Boost.ContainerHash requires C++11.

example/doc_assoc_optimized_code.cpp

@@ -13,20 +13,27 @@
 #include <boost/intrusive/set.hpp>
 #include <boost/intrusive/unordered_set.hpp>
 #include <cstring>
-
-using namespace boost::intrusive;
+#include <string>
 
 // Hash function for strings
 struct StrHasher
 {
    std::size_t operator()(const char *str) const
    {
+      //Simple example, use favorite hash function (like boost::hash_combine)
       std::size_t seed = 0;
-      for(; *str; ++str)   boost::hash_combine(seed, *str);
+      for(; *str; ++str){
+         std::size_t x = std::size_t(*str);
+         x = ((x >> 16) ^ x) * 0x45d9f3b;
+         x = (x >> 16) ^ x;
+         seed += x;
+      }
       return seed;
    }
 };
 
+using namespace boost::intrusive;
+
 class Expensive : public set_base_hook<>, public unordered_set_base_hook<>
 {
    std::string key_;