adding std::hash support for fc::array

CMakeLists.txt

@@ -92,8 +92,9 @@ set( fc_sources
      src/crypto/crc.cpp
      src/crypto/city.cpp
      src/crypto/base32.cpp
-     src/crypto/base64.cpp
+     src/crypto/base36.cpp
      src/crypto/base58.cpp
+     src/crypto/base64.cpp
      src/crypto/bigint.cpp
      src/crypto/hex.cpp
      src/crypto/sha1.cpp

include/fc/array.hpp

@@ -53,4 +53,21 @@ namespace fc {
     else
         memset( &bi, char(0), sizeof(bi) );
   }
+
+
+}
+
+#include <fc/crypto/city.hpp>
+namespace std
+{
+    template<typename T> struct hash;
+
+    template<typename T, size_t N>
+    struct hash<fc::array<T,N> >
+    {
+       size_t operator()( const fc::array<T,N>& e )const
+       {
+          return fc::city_hash64( (char*)&e, sizeof(e) );
+       }
+    };
 }