bug fixes

server/aggregations.h

@@ -172,13 +172,7 @@ decayed_t<VT, T> deltas(const VT<T>& arr) {
 template<class T, template<typename ...> class VT>
 T last(const VT<T>& arr) {
 	const uint32_t& len = arr.size;
-	decayed_t<VT, T> ret(len);
-	uint32_t i = 0;
-	if (len)
-		ret[i++] = arr[0];
-	for (; i < len; ++i) 
-		ret[i] = arr[i-1];
-	return ret;
+	return arr[arr.size - 1];
 }
 
 // wrong behavior with count(0)

server/hasher.h

@@ -17,6 +17,39 @@ inline size_t append_bytes(const unsigned char* _First) noexcept {
 	return _Val;
 }
 
+namespace std{
+	template<>
+	struct hash<astring_view> {
+		size_t operator()(const astring_view& _Keyval) const noexcept {
+			return append_bytes(_Keyval.str);
+		}
+	};
+	template<>
+	struct hash<types::date_t> {
+		size_t operator() (const types::date_t& _Keyval) const noexcept {
+			return std::hash<unsigned int>()(*(unsigned int*)(&_Keyval));
+		}
+	};
+	template<>
+	struct hash<types::time_t> {
+		size_t operator() (const types::time_t& _Keyval) const noexcept {
+			return std::hash<unsigned int>()(_Keyval.ms) ^ 
+			std::hash<unsigned char>()(_Keyval.seconds) ^
+			std::hash<unsigned char>()(_Keyval.minutes) ^
+			std::hash<unsigned char>()(_Keyval.hours)
+			;
+		}
+	};
+	template<>
+	struct hash<types::timestamp_t>{
+		size_t operator() (const types::timestamp_t& _Keyval) const noexcept {
+			return std::hash<types::date_t>()(_Keyval.date) ^ 
+				std::hash<types::time_t>()(_Keyval.time);
+		}
+	};
+
+}
+
 inline size_t append_bytes(const astring_view& view) noexcept {
 	return append_bytes(view.str);
 }
@@ -32,10 +65,8 @@ struct hasher {
 	template <size_t i = 0> typename std::enable_if< i < sizeof ...(Types), 
 		size_t>::type hashi(const std::tuple<Types...>& record) const {
 		using current_type = typename std::decay<typename std::tuple_element<i, std::tuple<Types...>>::type>::type;
-		if constexpr (is_cstr<current_type>())
-			return append_bytes((const unsigned char*)std::get<i>(record)) ^ hashi<i + 1>(record);
-		else
-			return std::hash<current_type>()(std::get<i>(record)) ^ hashi<i+1>(record);
+		
+		return std::hash<current_type>()(std::get<i>(record)) ^ hashi<i+1>(record);
 	}
 	size_t operator()(const std::tuple<Types...>& record) const {
 		return hashi(record);