[swift-users] Optionals inside Dictionary where Value = Any

[Daniel Eggert]

> On 06 Jan 2016, at 12:20, Dmitri Gribenko <gribozavr at gmail.com> wrote:
> 
> On Wed, Jan 6, 2016 at 12:47 PM, Daniel Eggert via swift-users
> <swift-users at swift.org> wrote:
>> I’m storing an Int? inside a [String:Any] but I can’t retrieve it again. Is this expected behaviour or a bug in Swift?
>> 
>> /Daniel
>> 
>> % swift
>> Welcome to Apple Swift version 2.2-dev (LLVM 3ebdbb2c7e, Clang f66c5bb67b, Swift 1f2908b4f7). Type :help for assistance.  3> let d: [String:Any] = ["foo": (nil as Int?)]
>> d: [String : Any] = 1 key/value pair {
>>  [0] = {
>>    key = "foo"
>>    value = {
>>      payload_data_0 = 0x0000000000000000
>>      payload_data_1 = 0x636c6f6f542f7201
>>      payload_data_2 = 0x77732f736e696168
>>      instance_type = 0x00000001004f6028
>>    }
>>  }
>> }
>>  4> let v = d["foo"]
>> v: Any? = Some {
>>  payload_data_0 = 0x0000000000000000
>>  payload_data_1 = 0x0000000000000001
>>  payload_data_2 = 0x0000000000000000
>>  instance_type = 0x00000001004f6028
>> }
> 
> I think this is a bug, but not in the code that you are showing.  'v'
> is correctly typed as 'Any?'.  The issue is that the compiler does not
> allow it to be downcast to 'Int?':
> 
>> v! as Int?
> <REPL Input>:1:2: error: cannot convert value of type 'Any' (aka
> 'protocol<>') to type 'Int?' in coercion
> v! as Int?
> 
> Would you mind filing a bug?


I filed “Can not retrieve Optinals from [String:Any] Dictionary”:
<https://bugs.swift.org/browse/SR-481>

/Daniel