我有一个类似的(简化的)代码: create table w_mutating2 (id number);
update w_mutating1 set num = (select max(id) from w_mutating2);* from w_mutating2; 在那之后,我的表w_mutating1就是空值了。
这里有一个可以逐字复制的游乐场: public let brightness: Mutating<Lumens>public let volume: Mutating<Decibels> self.brightness=Mutating<Lumens>()self.volume=Mutating<Decibels>()}
public s
mutating func mutatingFunc()}struct MyStruct {If I remove the mutating keyword from following method definition, compiler will give me error, that'sAlso note that, if I remove the mutating keyword while defining prot