StockWeight支持从数据库获取最新数据(continue)

hikyuu_cpp/hikyuu/Stock.cpp

@@ -58,6 +58,7 @@ Stock::Data::Data()
   m_valid(default_valid),
   m_startDate(default_startDate),
   m_lastDate(default_lastDate),
+  m_lastUpdateWeight(Datetime::min()),
   m_tick(default_tick),
   m_tickValue(default_tickValue),
   m_unit(default_unit),
@@ -75,6 +76,7 @@ Stock::Data::Data(const string& market, const string& code, const string& name,
   m_valid(valid),
   m_startDate(startDate),
   m_lastDate(lastDate),
+  m_lastUpdateWeight(Datetime::min()),
   m_tick(tick),
   m_tickValue(tickValue),
   m_precision(precision),

hikyuu_cpp/hikyuu/Stock.h

@@ -222,6 +222,7 @@ struct HKU_API Stock::Data {
     Datetime m_lastDate;   //证券最后日期
 
     StockWeightList m_weightList;  //权息信息列表
+    Datetime m_lastUpdateWeight;   //上次更新权息列表缓存的时刻
 
     price_t m_tick;
     price_t m_tickValue;