Scala manifest and instances

Question

I'm using Jerkson, and I need to check if a given class can be serialized. The java version just needs a class, but jerkson does this:

 def canSerialize[A](implicit mf: Manifest[A]) = mapper.canSerialize(mf.erasure)

Given that I have an instance, how can I call this? I pretty much tried

canSerialize[ClassManifest.fromClass(foo)]

But its not working. I wonder why the guys at jerkson could not make it simpler by just making this: canSerialize(Class[_]) ...

Any ideas on how can I invoke this?

Edit:

I fixed this by using:

canSerilialize(Manifest.classType(foo.getClass))

Adding more context: If I try to use the canSerialize(ClassManifest.fromClass(foo)) I get the following: type mismatch; found : scala.reflect.ClassManifest[?0] where type ?0 <: com.acme.domain.Foo required: Manifest[?] — Vinicius Carvalho, Mar 25 '12 at 15:18

score 3 · Answer 1 · edited May 23 '17 at 12:27

3

How about this:

canSerialize[Foo]

Compiler can automatically generate manifest for you (if it has enough type information in context)

Since Scala 2.8.0 canSerialize can be written via context bound. See more

edited May 23 '17 at 12:27

Community

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answered Mar 25 '12 at 06:08

Sergey Passichenko

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Problem is that I don't know the type in advance. I tried ClassManifest.fromClass(foo.getClass) but its not working. Other ideas? – Vinicius Carvalho Mar 25 '12 at 15:12

Tomer Gabel · Answer 2 · 2012-03-28T17:51:52.830

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If you don't know the class in advance, you can always pass the manifest as a parameter, i.e. this should work: canSerialize( Manifest.classType( foo.getClass ) ).

edited Mar 28 '12 at 17:51

answered Mar 25 '12 at 09:33

Tomer Gabel

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This is actually what I tried on the question and it does not work. – Vinicius Carvalho Mar 25 '12 at 14:32

Scala manifest and instances

2 Answers2