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Question by jica · Jan 29, 2015 at 02:32 PM · iosgenericsaotjit

iOS JIT compile error on Generic method called with basic types (int, bool, float)

I have a generic method like this:

 public class MyClass
 {
     public T MyMethod<T>(string arg)
     {
         return default(T);
     }
 }

When I try to call the method like this:

 int someInt = MyClassInstance.MyMethod<int>("some_string");

I get the following error:

 Attempting to JIT compile method 'MyClass.MyMethod<int> (string)' while running with --aot-only.

This also happens to bool and float types but it works for string.

Would you guys know why this happens? Thanks!

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Answer by steakpinball · Jan 29, 2015 at 02:42 PM

This happened because just-in-time (JIT) compilation does not work on iOS. All code must be ahead-of-time (AOT) compatible. default() sometimes uses JIT. When this happens, you will have to write the code in such a way to remove the use of default(). I can't predict if it will or won't.

I will update this answer if I figure out more.

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avatar image jica · Jan 30, 2015 at 03:46 AM 0
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All right. Thanks! :)

avatar image ayyappa · Apr 29, 2015 at 06:10 PM 0
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Can someone confirm this please?

@brianturner @jica : Because I see default keyword being used in Dictionary implementation for TryGetValue. Was wondering how this got accepted as answer? Please suggest.

avatar image steakpinball · Apr 30, 2015 at 03:01 PM 0
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Interesting. I wasn't aware Dictionary was using it. I ran some test and found there are some instance where it does work, but can't see why it does or doesn't. If it works for you, Great.

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