and I have a function that takes in an object of type ProtocolA & ProtocolB & ProtocolC as a paramater, I am sometimes unable to access the remoteId of the object. The issue has occured around 5 times the only common thread between the instances is that they occur when I pass around a protocol type composed of a large number of subtypes, ie: an object that is represented as ProtocolA & ProtocolB & ProtocolC. Thus far, the only cases where this issue occurs and I can read the property without getting the EXC_BAD_ACCESS error (although the property value is incorrect, as shown in the second example) is when the property is an Enum. All I've been able to gather is that the ABI for Enums differs from the ABI for classes or protocols. I've tried reading through the Swift ABI and other resources to get a better understanding of what is going on under the hood, but I can't grok enough to fix this issue.
There is something going on with the memory layout and protocol witness table. I can continue to work around this issue by casting to concrete types, but each time I do it makes it harder to write unit tests. (lldb) po (displayable as! CTVMediaMetadata).mediaType There are many different versions available.
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Mac OS is the operating system that is used for all Apple products. Mac > results for 'download' Results 1-8 of 8. The process has been returned to the state before expression evaluation. Mac All GROK Accessibility Resources Accounts Campus Resources & Technology. By a more concrete type I mean the type of the conforming object.Īs a result, debugger output often looks like this:Įrror: Execution was interrupted, reason: EXC_BAD_ACCESS (code=2, address=0x10a52e128). By correctly access I mean that, when I try to access the value, either a runtime error is thrown or the value is flat out incorrect. When I use a protocol as a type - for example, as a function paramater - I am unable to correctly access any of the conforming object's property values unless I explicitly cast the object to a more concrete type. I am constantly running into this issue with protocols in Swift 3 (Xcode 8.2.1):
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