AnyObject arrays

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AnyObject arrays

Alex Hall
Hello list,
The below code:

var a: [AnyObject] = []
let b: [AnyObject] = [2, "b", 17, 0.6]
a.appendContentsOf(b)

gives me the error:
error: value of type 'Int' does not conform to expected element type 'AnyObject'
let b: [AnyObject] = [2, "b", 17, 0.6]
                      ^

In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.

--
Have a great day,
Alex Hall
[hidden email]

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Re: AnyObject arrays

Swift Language mailing list
What version of Xcode? For me (7.0.1 OS X playground) it runs OK.

> On 13 Oct 2015, at 14:30, Alex Hall <[hidden email]> wrote:
>
> Hello list,
> The below code:
>
> var a: [AnyObject] = []
> let b: [AnyObject] = [2, "b", 17, 0.6]
> a.appendContentsOf(b)
>
> gives me the error:
> error: value of type 'Int' does not conform to expected element type 'AnyObject'
> let b: [AnyObject] = [2, "b", 17, 0.6]
>                       ^
>
> In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.
>
> --
> Have a great day,
> Alex Hall
> [hidden email]
>
>
> --
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Re: AnyObject arrays

Alex Hall

> On Oct 13, 2015, at 10:38, Jeremy Pereira <[hidden email]> wrote:
>
> What version of Xcode? For me (7.0.1 OS X playground) it runs OK.

I'm on Xcode 7.1, the current beta.

>
>> On 13 Oct 2015, at 14:30, Alex Hall <[hidden email]> wrote:
>>
>> Hello list,
>> The below code:
>>
>> var a: [AnyObject] = []
>> let b: [AnyObject] = [2, "b", 17, 0.6]
>> a.appendContentsOf(b)
>>
>> gives me the error:
>> error: value of type 'Int' does not conform to expected element type 'AnyObject'
>> let b: [AnyObject] = [2, "b", 17, 0.6]
>>                      ^
>>
>> In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.
>>
>> --
>> Have a great day,
>> Alex Hall
>> [hidden email]
>>
>>
>> --
>> You received this message because you are subscribed to the Google Groups "Swift Language" group.
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>> For more options, visit https://groups.google.com/d/optout.
>


--
Have a great day,
Alex Hall
[hidden email]

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Re: AnyObject arrays

Garth Snyder
In reply to this post by Alex Hall
Ints are indeed not objects; you need [Any] for this.

Note that your error is on the “let b…” line, not on the append line.

Hope this helps,
Garth


On Oct 13, 2015, at 6:30 AM, Alex Hall <[hidden email]> wrote:

Hello list,
The below code:

var a: [AnyObject] = []
let b: [AnyObject] = [2, "b", 17, 0.6]
a.appendContentsOf(b)

gives me the error:
error: value of type 'Int' does not conform to expected element type 'AnyObject'
let b: [AnyObject] = [2, "b", 17, 0.6]
                      ^

In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.

--
Have a great day,
Alex Hall
[hidden email]


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Re: AnyObject arrays

Swift Language mailing list
In reply to this post by Alex Hall

> On 13 Oct 2015, at 15:44, Alex Hall <[hidden email]> wrote:
>
>
>> On Oct 13, 2015, at 10:38, Jeremy Pereira <[hidden email]> wrote:
>>
>> What version of Xcode? For me (7.0.1 OS X playground) it runs OK.
>
> I'm on Xcode 7.1, the current beta.

I’d say raise a bug with Apple, but I was quite surprised when it ran under my Xcode, I was expecting the same error because Int is a struct and therefore not a subclass of AnyObject. I suspect, on 7.0.1, it is being silently converted into an NSInteger.


>>
>>> On 13 Oct 2015, at 14:30, Alex Hall <[hidden email]> wrote:
>>>
>>> Hello list,
>>> The below code:
>>>
>>> var a: [AnyObject] = []
>>> let b: [AnyObject] = [2, "b", 17, 0.6]
>>> a.appendContentsOf(b)
>>>
>>> gives me the error:
>>> error: value of type 'Int' does not conform to expected element type 'AnyObject'
>>> let b: [AnyObject] = [2, "b", 17, 0.6]
>>>                     ^
>>>
>>> In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.
>>>
>>> --
>>> Have a great day,
>>> Alex Hall
>>> [hidden email]
>>>
>>>
>>> --
>>> You received this message because you are subscribed to the Google Groups "Swift Language" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an email to [hidden email].
>>> To post to this group, send email to [hidden email].
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>>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
> --
> Have a great day,
> Alex Hall
> [hidden email]
>

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Re: AnyObject arrays

Alex Hall
In reply to this post by Garth Snyder

On Oct 13, 2015, at 10:47, Garth Snyder <[hidden email]> wrote:

Ints are indeed not objects; you need [Any] for this.

Thanks, I figured it was something simple I was missing. I've never heard of Any as a type, only AnyObject, but you're right, switching it to Any made things work as expected. I even made a simple class and stored an instance in the array, and that worked. Well, this makes my app's problem all the more perplexing, because nothing there is simply an Int. I'll look more, then make a separate post if I can't work it out. Thanks guys.

Note that your error is on the “let b…” line, not on the append line.

Hope this helps,
Garth


On Oct 13, 2015, at 6:30 AM, Alex Hall <[hidden email]> wrote:

Hello list,
The below code:

var a: [AnyObject] = []
let b: [AnyObject] = [2, "b", 17, 0.6]
a.appendContentsOf(b)

gives me the error:
error: value of type 'Int' does not conform to expected element type 'AnyObject'
let b: [AnyObject] = [2, "b", 17, 0.6]
                      ^

In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.

--
Have a great day,
Alex Hall
[hidden email]


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--
Have a great day,
Alex Hall
[hidden email]

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Re: AnyObject arrays

Bruno Berisso
What you are missing is the magic on Foundation. Ugly things happen there :(

This is a synthesis of your case in the Swift REPL:

Welcome to Apple Swift version 2.0 (700.0.59 700.0.72). Type :help for assistance.
 
1> let a: AnyObject = 1
repl
.swift:1:20: error: value of type 'Int' does not conform to specified type 'AnyObject'
let a
: AnyObject = 1
                   
^
 
1> import Foundation
 
2> let a: AnyObject = 1
a
: __NSCFNumber = Int64(1)
 
3>

As you see there. Importing Foundation do things that translate Int structs to NSNumber (not NSInteger because those are typedefs) which make invalid Swift statements become valid.

In practice this is annoying but at the end NSNumber have value semantics (you can't mutate it) so it's not that bad. I think that it's the price to pay for use Swift with the Objective-C runtime.


El martes, 13 de octubre de 2015, 11:59:18 (UTC-3), Alex Hall escribió:

On Oct 13, 2015, at 10:47, Garth Snyder <<a href="javascript:" target="_blank" gdf-obfuscated-mailto="Vlm1JsQDAwAJ" rel="nofollow" onmousedown="this.href=&#39;javascript:&#39;;return true;" onclick="this.href=&#39;javascript:&#39;;return true;">ga...@...> wrote:

Ints are indeed not objects; you need [Any] for this.

Thanks, I figured it was something simple I was missing. I've never heard of Any as a type, only AnyObject, but you're right, switching it to Any made things work as expected. I even made a simple class and stored an instance in the array, and that worked. Well, this makes my app's problem all the more perplexing, because nothing there is simply an Int. I'll look more, then make a separate post if I can't work it out. Thanks guys.

Note that your error is on the “let b…” line, not on the append line.

Hope this helps,
Garth


On Oct 13, 2015, at 6:30 AM, Alex Hall <<a href="javascript:" target="_blank" gdf-obfuscated-mailto="Vlm1JsQDAwAJ" rel="nofollow" onmousedown="this.href=&#39;javascript:&#39;;return true;" onclick="this.href=&#39;javascript:&#39;;return true;">meh...@...> wrote:

Hello list,
The below code:

var a: [AnyObject] = []
let b: [AnyObject] = [2, "b", 17, 0.6]
a.appendContentsOf(b)

gives me the error:
error: value of type 'Int' does not conform to expected element type 'AnyObject'
let b: [AnyObject] = [2, "b", 17, 0.6]
                      ^

In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.

--
Have a great day,
Alex Hall
<a href="javascript:" target="_blank" gdf-obfuscated-mailto="Vlm1JsQDAwAJ" rel="nofollow" onmousedown="this.href=&#39;javascript:&#39;;return true;" onclick="this.href=&#39;javascript:&#39;;return true;">meh...@...


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--
Have a great day,
Alex Hall
<a href="javascript:" target="_blank" gdf-obfuscated-mailto="Vlm1JsQDAwAJ" rel="nofollow" onmousedown="this.href=&#39;javascript:&#39;;return true;" onclick="this.href=&#39;javascript:&#39;;return true;">meh...@...

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Re: AnyObject arrays

Fritz Anderson
In reply to this post by Swift Language mailing list
If you're right about Int being silently bridged to NSNumber, I'd ask if your playground imported Foundation (UIKit, Cocoa) and the OP’s didn't.

    — F


> On Oct 13, 2015, at 9:38 AM, 'Jeremy Pereira' via Swift Language <[hidden email]> wrote:
>
> What version of Xcode? For me (7.0.1 OS X playground) it runs OK.
>
>> On 13 Oct 2015, at 14:30, Alex Hall <[hidden email]> wrote:
>>
>> Hello list,
>> The below code:
>>
>> var a: [AnyObject] = []
>> let b: [AnyObject] = [2, "b", 17, 0.6]
>> a.appendContentsOf(b)
>>
>> gives me the error:
>> error: value of type 'Int' does not conform to expected element type 'AnyObject'
>> let b: [AnyObject] = [2, "b", 17, 0.6]
>>                      ^
>>
>> In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.
>>
>> --
>> Have a great day,
>> Alex Hall
>> [hidden email]
>>
>>
>> --
>> You received this message because you are subscribed to the Google Groups "Swift Language" group.
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>
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Re: AnyObject arrays

Swift Language mailing list

> On 13 Oct 2015, at 20:15, Fritz Anderson <[hidden email]> wrote:
>
> If you're right about Int being silently bridged to NSNumber, I'd ask if your playground imported Foundation (UIKit, Cocoa) and the OP’s didn't.

It could be. I was importing Foundation and I do get an error if I remove it. The error is less helpful than with 7.1, it’s

error: type of expression is ambiguous without more context
let b: [AnyObject] = [2, "b", 17, 0.6]

and the caret points at the 2 as you would expect.

>
>    — F
>
>
>> On Oct 13, 2015, at 9:38 AM, 'Jeremy Pereira' via Swift Language <[hidden email]> wrote:
>>
>> What version of Xcode? For me (7.0.1 OS X playground) it runs OK.
>>
>>> On 13 Oct 2015, at 14:30, Alex Hall <[hidden email]> wrote:
>>>
>>> Hello list,
>>> The below code:
>>>
>>> var a: [AnyObject] = []
>>> let b: [AnyObject] = [2, "b", 17, 0.6]
>>> a.appendContentsOf(b)
>>>
>>> gives me the error:
>>> error: value of type 'Int' does not conform to expected element type 'AnyObject'
>>> let b: [AnyObject] = [2, "b", 17, 0.6]
>>>                     ^
>>>
>>> In my project, I have an array that will hold three or four object types, each type a subclass of a single parent. The only way I saw of doing this was with an array of AnyObject, but Xcode told me that I couldn't append arrays of my different objects to my AnyObject array. I therefore made the above playground to see what would happen, and while this error isn't the same as what I was seeing, it still suggests I've badly misunderstood AnyObject arrays. I suppose it could be a bug, but a mistake on my part is much more probable. :) Thanks for any light anyone can shed on this. Oh, Xcode 7.1 if it matters.
>>>
>>> --
>>> Have a great day,
>>> Alex Hall
>>> [hidden email]
>>>
>>>
>>> --
>>> You received this message because you are subscribed to the Google Groups "Swift Language" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an email to [hidden email].
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>>
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