[swift-users] initializer with alternative

[J.E. Schotsman via swift-users]

Hello,

I have a class that can be initialized from a file.
I would like to add a convenience init that uses a backup file if necessary.
Writing a function for this is easy, but I can’t manage to turn this into an 
init function.

import Foundation

class TestClass
        {
        init( fromFile file:NSURL ) throws
                {
                
                }
        
        convenience init( fromFile file:NSURL, fromBackupFile backupFile:NSURL 
) throws
                {
                do { try self.init( fromFile:file ) }
                catch {
                        do { try self.init( fromFile:backupFile ) } // error: 
'self' used inside 'catch' block reachable from self.init call
                        }
                }
        }

func MakeTestClass( fromFile file:NSURL, fromBackupFile backupFile:NSURL ) 
throws -> TestClass
        {
        do { return try TestClass( fromFile:file ) } 
        catch { do { return try TestClass( fromFile:backupFile ) } } 
        }

Any suggestions?
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users