Still trying on this (copied the code directly, Foo is actually XCTestCase):
typealias TestMethod = @convention(c) (XCTestCase) throws -> Void
This seagulls the compiler with “error: '(XCTestCase) throws -> Void' is not
representable in Objective-C, so it cannot be used with '@convention(c)’”. I’m
trying to use it here:
let testMethod: IMP = method_getImplementation(method)
let test: TestMethod = unsafeBitCast(testMethod,
to: TestMethod.self)
testMethods.append((methodName as String, test))
If I try to put the type directly in the call to unsafeBitCast(), the compiler
gives me an error:
Attribute can only be applied to types, not declarations
Thanks for your suggestions! I hadn’t seen @convention() before.
Jeff Kelley
[email protected] | @SlaunchaMan <https://twitter.com/SlaunchaMan> |
jeffkelley.org <http://jeffkelley.org/>
> On Nov 21, 2016, at 12:08 AM, Jacob Bandes-Storch <[email protected]> wrote:
>
> 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 <[email protected]
> <mailto:[email protected]>> 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
>
> [email protected] <mailto:[email protected]> | @SlaunchaMan
> <https://twitter.com/SlaunchaMan> | jeffkelley.org <http://jeffkelley.org/>
>> On Nov 19, 2016, at 1:58 AM, Jacob Bandes-Storch <[email protected]
>> <mailto:[email protected]>> 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
>> <[email protected] <mailto:[email protected]>> 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
>>
>> [email protected] <mailto:[email protected]> | @SlaunchaMan
>> <https://twitter.com/SlaunchaMan> | jeffkelley.org <http://jeffkelley.org/>
>>
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>>
>
>
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