Int/Str/List/Map... thay are no @Serializable facet. How to determine whether a type can be serialized.

You can use type literal to get the Type object and then examine if the type has Serializable facet, like: echo(Int#.facets)

The output will look like: [sys::Serializable { simple=true collection=false }]

To specifically examine if the type has Serializable facet or not, you can use hasFacet method, like: echo("Serializable? " + Int#.hasFacet(Serializable#))

The output will look like: Serializable? true

Hope that helps.

• Roy

Yes,the Int has Serializable facet.but:

fansh> Str#.hasFacet(Serializable#)
false
fansh> List#.hasFacet(Serializable#)
false
fansh>

I didn't realize that. Except that this is what the Serialization documentation says:

Most of the standard Fantom literals such as Bool, Int, Str are supported as well as the collections types List and Map.

So I presume that at the language level there is support for serialization of List and Map, by checking the provided object.

Still it would be nice to have the facets on List and Map so that anyone programmatically check if an object is serializable doesn't have to have any special code to handle these.

All the primitives, list, and map are handled specially by the encoder - so marking them as Serializable is just convention really. It was just an oversight that List and Map weren't marked correctly. I pushed a fix for that problem.

Wow. Brian: I am new to the Fantom community and that was one of my first suggestions. Thanks a lot for the blazing fast fix.