我怀疑自由安道尔是否是处置物体的理想办法。 我走过了各种法典,像一些这样的东西。
StringList1.Free;
StringList1 := Nil;
使用。 以上一线是高技能的,还是更好做事? 这两种办法之间的区别是什么?
Strictly speaking, to dispose of an object you only need to call Destroy. However, if the reference is nil, ie. has not been assigned a pointer to a valid instance of an object, this would cause an access violation, so it s recommended to call Free instead which checks first if the passed reference is nil and does nothing in that case.
FreeAndNil first assigns the passed reference to a temporary local variable, then assigns nil to the passed reference, then calls Free to dispose of the instance. The only difference between FreeAndNil and your sequence obj.Free; obj := nil; is that in the first case the passed reference will be nil even if the destructor raises an exception.
贵问题中的守则可能由那些对FreeAndNil之前,该文本已添加到RTL中。 如果你想要打字,你也可以使用<代码>FreeAndNil。 用长篇字书写,无助。
唯一的实际差异是FreeAndNil将提及。 Nil 即使有Free的提出。 但是,你们的信徒永远不应有任何进展,因此,我认为,这不是一件大事。
有一种常见的陷阱是FreeAndNil。 由于它带有不定的参数,你可以穿透任何东西。 例如,你可以通过接口、记录等。 如果你犯了这一错误,你通常会最后出现奇怪的错误。
I m not going to get started on whether or not FreeAndNil is an appropriate design choice. That topic has been covered in some depth elsewhere.
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