For a function such as bar() above, the type you want to cast the IMP to would probably be "@convention(c) (Foo, Selector) -> ()".
On Sun, Nov 20, 2016 at 9:05 PM, Jeff Kelley <slauncha...@gmail.com> wrote: > Thanks Jacob! I tried using unsafeBitCast, but it fails with the > following: “fatal error: can't unsafeBitCast between types of different > sizes”. I considered wrapping every call in a closure that calls > objc_msgSend(), but alas, that’s not exposed to Swift. I have another > approach in mind, so I’ll try that next. > > > Jeff Kelley > > slauncha...@gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> | > jeffkelley.org > > On Nov 19, 2016, at 1:58 AM, Jacob Bandes-Storch <jtban...@gmail.com> > wrote: > > I imagine unsafeBitCast would be the way to go here. But are you assuming > that all of the instance methods have type "(Foo) throws -> Void" ? Or do > you somehow want to dynamically use the type information? > > Jacob > > On Fri, Nov 18, 2016 at 10:37 PM, Jeff Kelley via swift-users < > swift-users@swift.org> wrote: > >> Hello, >> >> I’m trying to enumerate the methods of a class in Swift using the >> Objective-C runtime. Everything is working fine so far, except for the very >> last step. Suppose I have a Swift class like this: >> >> class Foo: SomeSuperclass { >> >> @objc func bar() { >> print("Hello, World!") >> } >> >> } >> >> Using the Objective-C runtime methods, I can get the method with >> class_copyMethodList and then get to the method’s implementation using >> method_getImplementation. However, what I need to do next is to stick >> this into a tuple that looks like this: >> >> typealias FooEntry = (fooClass: SomeSuperclass.Type, methods: [(String, ( >> Foo) throws -> Void)]) >> >> For now, the workaround is to make a static variable that returns all of >> the entries: >> >> static var allEntries = { >> return [ >> ("bar", bar), >> ] >> } >> >> Is there any way to go from the raw IMP that I get back from the runtime >> to the Swift type so I can construct this list dynamically? >> >> >> Jeff Kelley >> >> slauncha...@gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> | >> jeffkelley.org >> >> >> _______________________________________________ >> swift-users mailing list >> swift-users@swift.org >> https://lists.swift.org/mailman/listinfo/swift-users >> >> > >
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