原始SQL如下: SELECT MONTH(OrderTime) AS datetype, SUM(DeliveryCount) AS decount, Region FROM (SELECT dbo.mpc_Order.OrderTime, dbo.mpc_Order.Province + '-' + dbo.mpc_Order.City + '-' + dbo.mpc_Order.Area AS Region, dbo.mpc_Order_Delivery.DeliveryCount FRO
我遇到例如以下问题: int count=0; listener->onTouchMoved=[count](Touch* t,Event* e){ count++; log("onTouchMoved"); }; Xcode下的编译错误为:Cannot assign to a variable captured by copy in a non-mutable lambda. 那么怎样解决呢? 在 lambda表达式中.捕获的变量默认是不可变的. This function c