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    <p>It’s of course hard to guess but I think your class should <em>maybe</em> (you’d have to change quite a bit to make it actually work) look like this</p> <pre><code>class GridBase[T &lt;: DescripTypes](val myHex: T#HexT) { this: T =&gt; var testvar = 5 var testvar2 = "" def mymethod(var1: HexT) { testvar += var1.num1 } def method2(var1: SideT) { testvar2 = var1.sideString } } </code></pre> <p>In your example <code>mymethod</code> takes any <code>HexT</code> whereas I think you want to restrict it to the same outer class that <code>myHex</code> has.</p> <p>Depending on the use-case, (the self-type requires you to mix-in a sub-trait of <code>DescripTypes</code>), the following is more appropiate:</p> <pre><code>class GridBase[T &lt;: DescripTypes](val myHex: T#HexT) { var testvar = 5 var testvar2 = "" def mymethod(var1: T#HexT) { testvar += var1.num1 } def method2(var1: T#SideT) { testvar2 = var1.sideString } } </code></pre> <p>You’d have to specify the subclass of <code>DescripTypes</code> and could then use the type aliases defined in these subclasses.</p> <pre><code>val scenType = new ScenTypes val scenTypeHex = new scenType.HexT val scenTypeSide = new scenType.SideT val gb_st = new GridBase[ScenTypes](scenTypeHex) gb_st.mymethod(scenTypeHex) gb_st.method2(scenTypeSide) // and the same for some other subclass of DescribTypes val scenType2 = new ScenTypes2 val scenType2Hex = new scenType2.HexT val scenType2Side = new scenType2.SideT val gb_st2 = new GridBase[ScenTypes2](scenType2Hex) gb_st2.mymethod(scenType2Hex) gb_st2.method2(scenType2Side) // Does not compile: gb_st2.method2(scenTypeSide) </code></pre>
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    1. POScala: Self types in Constructors for generic classes
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    1. COHopefully edit has clarified. I don't think there's any inner classes here. The examples are not that useful as they don't return a specific type.
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    2. COThanks that "this: T =>" is neater.
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    3. CO@RichOliver DescripTypes#HexT is an abstract inner type
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