FixedHash::bloom() refactored

libdevcore/FixedHash.h

@@ -158,16 +158,17 @@ public:
 
 	template <unsigned P, unsigned M> inline FixedHash& shiftBloom(FixedHash<M> const& _h)
 	{
-		return (*this |= _h.template bloom<P, N>());
+		return (*this |= _h.template bloomPart<P, N>());
 	}
 
 	template <unsigned P, unsigned M> inline bool containsBloom(FixedHash<M> const& _h)
 	{
-		return contains(_h.template bloom<P, N>());
+		return contains(_h.template bloomPart<P, N>());
 	}
 
-	template <unsigned P, unsigned M> inline FixedHash<M> bloom() const
+	template <unsigned P, unsigned M> inline FixedHash<M> bloomPart() const
 	{
+		static_assert((M & (M - 1)) == 0, "M must be power-of-two");
 		static const unsigned c_bloomBits = M * 8;
 		unsigned mask = c_bloomBits - 1;
 		unsigned bloomBytes = (dev::toLog2(c_bloomBits) + 7) / 8;