JSONDecoder Generics ParserType Thread 1: EXC_BAD_ACCESS (code=1, address=0x8)

Using Swift
,
1

I have a superclass for generic parsing

class Converter<T, U> {

func convert(value: T) throws -> U {

preconditionFailure("Converter not implemented")

  }

}

class Factory {

required init () { }

var className: String {

 return  "\( self )"

}

fund responseBodyConverter<T>(type: T.Type) -> Converter<Data, T>? {

 return  nil

  }

}

and have a subclass with Generic type constraint

final class CodableConverter<T>: Converter<Data, T>  where T: Decodable {

var jsonDecoder: JSONDecoder
let type: T.Type
init(_ jsonDecoder: JSONDecoder,  type: T.Type) {
	self.jsonDecoder = jsonDecoder
	self.type = type
}

override func convert(value: Data) throws -> T  {
	
	do {
		
		return try JSONDecoder().decode(type, from: value)

	} catch {
		throw error
	}
 }
}


class CodableConverterFactory: Factory {

static func create() -> CodableConverterFactory {
	
	return CodableConverterFactory()
}

override func responseBodyConverter<T>(type: T.Type) -> Converter<Data, T>? where T: Decodable {
 	return CodableConverter(JSONDecoder(), type: type.self)
}

}

here try to create a new instance and call override method app crash Thread 1: EXC_BAD_ACCESS (code=1, address=0x8)

but when try to execute the JSONDecoder in LLDB console using po command is working

 let factory = CodableConverterFactory.create()
  let result = factory.responseBodyConverter(type: User.self)
	do {
	let user = try result?.convert(value: json.data(using: .utf8)!)
		print(user)

	} catch {
		print(error)
	}
2

Seems like a multi-threading issue somewhere else, not the issue with this class.

3

I' do not create from any thread all functions called on the main thread

just try to add constraint type into super class it's working like this

class Factory {
     .......
      fund responseBodyConverter<T: Decodable >(type: T.Type) -> Converter<Data, T>? {
}