bool CloseSide(const bool isBuy, const string why)
{
   bool anyFailed = false;
   for(int i = PositionsTotal() - 1; i >= 0; i--) {
      ...
      if(!ClosePositionRetry(ticket, "方向平仓")) anyFailed = true;
   }
   if(!anyFailed) DeletePendings(isBuy);  // 全平成功才删挂单
   PrintFormat(...);
   return !anyFailed;
}

bool CloseSide(const bool isBuy, const string why)
{
   bool anyFailed = false;
   for(int i = PositionsTotal() - 1; i >= 0; i--) {
      ...
      if(!ClosePositionRetry(ticket, "方向平仓")) anyFailed = true;
   }
   if(!anyFailed) DeletePendings(isBuy);  // 全平成功才删挂单
   PrintFormat(...);
   return !anyFailed;
}