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19466009
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2013-10-19T12:27:33.990
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2013-10-19T12:27:33.990
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You code is wrong, it won't even compile. Your <code>GenericEchoer</code> cannot be a <code>class</code>, cause your <code>content</code> member is abstract, or you should init this with a default value: <pre><code>class GenericEchoer[T <: AnyRef] { var content: T = _ def echo: String = "Echo: " + T.toString } </code></pre> You can't write <code>T.toString</code>, i guess you wanted <code>content.toString</code>. You can't pass <code>Int</code> to it, cause <code>Int</code> has <code>AnyVal</code> as its supertype, and your upper bound of <code>T</code> is <code>AnyRef</code>. <code>self.content</code> in <code>Substitution</code> is also illegal, you should: 1) make <code>self</code> as a selftype: <pre><code>trait Substitution[T <: AnyRef] extends GenericEchoer[T] { self => def substitute(newValue: T) = { self.content = newValue } } </code></pre> 2) Replace it with <code>this</code> 3) Just leave <code>{ content = newValue }</code> As for your problem. No it's not possible. I can suggest you replace <code>class</code> with a <code>trait</code> and type constructor with an abstract type member: <pre><code>trait GenericEchoer { type T <: AnyRef var content: T = _ def echo: String = "Echo: " + content.toString } trait Substitution extends GenericEchoer { def substitute(newValue: T) { content = newValue } } val enchoer = new GenericEchoer with Substitution { type T = String } </code></pre> or better <pre><code>val enchoer = new GenericEchoer with Substitution { type T = String var content = "Hello" // either case it will be null } </code></pre>
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1. POHow can mixin know type parameters of generic superclass
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1. US4lex1v
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1. POHow can mixin know type parameters of generic superclass
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1. COOK, I fixed the mistakes you pointed out. I haven't thought about using type member - thank you.
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 USWojciech Ptak

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