Allow hashing of uint128

include/fc/crypto/city.hpp

@@ -44,11 +44,13 @@
 #include <stdlib.h>  // for size_t.
 #include <stdint.h>
 #include <utility>
-#include <fc/uint128.hpp>
-#include <fc/array.hpp>
 
 namespace fc {
 
+class uint128;
+template<typename T, size_t N>
+class array;
+
 // Hash function for a byte array.
 uint64_t city_hash64(const char *buf, size_t len);
 

include/fc/uint128.hpp

@@ -4,6 +4,7 @@
 #include <string>
 
 #include <fc/exception/exception.hpp>
+#include <fc/crypto/city.hpp>
 
 #ifdef _MSC_VER
   #pragma warning (push)
@@ -22,7 +23,7 @@ namespace fc
 
 
      public:
-      uint128():hi(0),lo(0){};
+      uint128():hi(0),lo(0){}
       uint128( uint32_t l ):hi(0),lo(l){}
       uint128( int32_t l ):hi( -(l<0) ),lo(l){}
       uint128( int64_t l ):hi( -(l<0) ),lo(l){}
@@ -76,6 +77,8 @@ namespace fc
       friend bool    operator >=  ( const uint128& l, const uint128& r ) { return l == r || l > r; }
       friend bool    operator <=  ( const uint128& l, const uint128& r ) { return l == r || l < r; }
 
+      friend std::size_t hash_value( const uint128& v ) { return city_hash_size_t((const char*)&v, sizeof(v)); }
+
       uint32_t to_integer()const
       {
           FC_ASSERT( hi == 0 );

src/crypto/city.cpp

@@ -33,6 +33,8 @@
 #include <algorithm>
 #include <string.h>  // for memcpy and memset
 #include <fc/crypto/city.hpp>
+#include <fc/uint128.hpp>
+#include <fc/array.hpp>
 
 #if defined(__SSE4_2__) && defined(__x86_64__)
 #include <nmmintrin.h>