Make self mutating in init()

[anandabits (Matthew Johnson)]

@dabrahams

Please see this gist for a technique that allows you to do this.

This is fascinating - I don’t think this was possible in Swift, so thank you for posting it! I’m going to give it a try in a library I’m writing next week.

[dabrahams (Dave Abrahams)]

It's been out there a while; I think I came up with it first while helping someone in the WWDC 2014 labs. Surprised more people don't know about it!

[Nevin]

Is there an easy way to verify that it only allocates space for a single class instance?

In other words, the part where it reassigns self, can we verify that the compiler did not actually allocate space for Self instance prior to that, only to then deallocate it after the reassignment?

[dabrahams (Dave Abrahams)]

@Nevin

Is there an easy way to verify that it only allocates space for a single class instance?

swiftc -S FactoryInitializable.swift | xcrun swift-demangle and compare the code for testMe1 and testMe2