[swift-users] Memory Leak of Dictionary used in singleton

[Joe Groff]

> On Mar 11, 2017, at 4:04 PM, Ekaterina Belinskaya via swift-users <swift-users at swift.org> wrote:
> 
> Hi everyone!
> 
> I have singleton. It contains a 2 dictionaries. 
> 
> struct Stat {
>     var statHash:String
>     var displayDescription:String
>     var displayName:String
>     var displayIcon:String
>     var statIdentifier:String
> }
> 
> class Singleton {
> 
>     static let sharedInstance = Singleton()
> 
>     var statsDesc = [String:Stat]()
>     var test = [String: String]()
> 
>     init() {
>         test["a"] = "b"
>     }
> }
> 
> let singlton = Singleton.sharedInstance
> On using the leaks tool, I am getting a memory leak of the second dictionary(String, String).
> 
> screenshot of memory graph debugger <http://imgur.com/a/JRcGd>
> 
> If i remove dictionaries and write smth like that:
> 
> class Singleton {
>     
>     static let sharedInstance = Singleton()
>     var num: Int
>     
>     init() {
>         num = 3
>     }
> }
> leak disappears.
> 
> Could someone, please, explain why this happens?
> 
> 

This sounds a lot like:

https://bugs.swift.org/browse/SR-3661 <https://bugs.swift.org/browse/SR-3661> Memory Leak from Multiple Dictionary Properties

which was fixed in Xcode 8.3. What version of the compiler are you using?

-Joe

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