Re: [swift-users] access violation when weak variable
You code works fine in Xcode 7.3.1 (7D1014). So it must be a bug in Xcode 8.
Zhaoxin
On Sat, Jul 9, 2016 at 10:18 PM, Ray Fix via swift-users <
swift-users@swift.org> wrote:
>
> Hi!
>
> When I make a variable weak in Xcode 8 (both beta 1 and beta 2) I get a
> access violation. I think this is a bug, but want to make sure I am not
> missing something.
>
> Best regards,
> Ray
>
> //: Playground - noun: a place where people can play
>
> import UIKit
>
> class Person: CustomStringConvertible {
> var name: String
> weak var parent: Person? /// If I remove weak, no crash in Xcode 8
> beta 2, but leaks
> var children: [Person] = [] {
> didSet {
> children.forEach { $0.parent = self }
> }
> }
>
> init(name: String) {
> self.name = name
> print("initialized \(name)")
> }
> deinit {
> print("deinit \(name)")
> }
> var description: String {
> return name
> }
> }
>
> do {
> let frank = Person(name: "Frank")
> let lisa = Person(name: "Lisa")
> frank.children = [lisa] /// KABOOM!
> }
>
> ___
> swift-users mailing list
> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users
>
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Re: [swift-users] access violation when weak variable
The actual death is happening when setting the parent:
do {
let frank = Person(name: "Frank")
print("frank\(frank)")
let lisa = Person(name: "Lisa")
frank.parent = lisa // Dies here with EXC_BAD_ACCESS
You can click the eye to get a stack trace. (not included here because of
rdar://27263098 - can't get a copyable stack trace from a hard error in
playgrounds).
My bet it's something playground related - about 9 frames down in the stack
trace has a reference to the Playground Logger doing the Mirror thing.
Putting your code in to a standalone swift executable lets it work.
Cheers,
++md
On Sat, Jul 9, 2016 at 10:18 AM, Ray Fix via swift-users <
swift-users@swift.org> wrote:
>
> Hi!
>
> When I make a variable weak in Xcode 8 (both beta 1 and beta 2) I get a
> access violation. I think this is a bug, but want to make sure I am not
> missing something.
>
> Best regards,
> Ray
>
> //: Playground - noun: a place where people can play
>
> import UIKit
>
> class Person: CustomStringConvertible {
> var name: String
> weak var parent: Person? /// If I remove weak, no crash in Xcode 8
> beta 2, but leaks
> var children: [Person] = [] {
> didSet {
> children.forEach { $0.parent = self }
> }
> }
>
> init(name: String) {
> self.name = name
> print("initialized \(name)")
> }
> deinit {
> print("deinit \(name)")
> }
> var description: String {
> return name
> }
> }
>
> do {
> let frank = Person(name: "Frank")
> let lisa = Person(name: "Lisa")
> frank.children = [lisa] /// KABOOM!
> }
>
> ___
> swift-users mailing list
> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users
>
___
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[swift-users] access violation when weak variable
Hi!
When I make a variable weak in Xcode 8 (both beta 1 and beta 2) I get a access
violation. I think this is a bug, but want to make sure I am not missing
something.
Best regards,
Ray
//: Playground - noun: a place where people can play
import UIKit
class Person: CustomStringConvertible {
var name: String
weak var parent: Person? /// If I remove weak, no crash in Xcode 8 beta
2, but leaks
var children: [Person] = [] {
didSet {
children.forEach { $0.parent = self }
}
}
init(name: String) {
self.name = name
print("initialized \(name)")
}
deinit {
print("deinit \(name)")
}
var description: String {
return name
}
}
do {
let frank = Person(name: "Frank")
let lisa = Person(name: "Lisa")
frank.children = [lisa] /// KABOOM!
}
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