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    <p>From your code, function g takes a string parameter and returns a string. I suggest you create a class module called IStringFunction to act as the definition of an interface that all functions will support, thus:</p> <p><strong>Class Module: IStringFunction</strong></p> <pre><code>Public Function Evaluate(ByVal s As String) As String End Function </code></pre> <p>Then, create a couple of example functions implementing this interface:</p> <p><strong>Class Module: HelloStringFunction</strong></p> <pre><code>Implements IStringFunction Public Function IStringFunction_Evaluate(ByVal s As String) As String IStringFunction_Evaluate = "hello " &amp; s End Function </code></pre> <p><strong>Class Module: GoodbyeStringFunction</strong></p> <pre><code>Implements IStringFunction Public Function IStringFunction_Evaluate(ByVal s As String) As String IStringFunction_Evaluate = "goodbye " &amp; s End Function </code></pre> <p>...and finally, some test code to exercise the functions:</p> <p><strong>(Standard) Module: Test</strong></p> <pre><code>Sub Test() Dim oHello As New HelloStringFunction Dim oGoodbye As New GoodbyeStringFunction MsgBox Evaluate(oHello, "gary") MsgBox Evaluate(oGoodbye, "gary") End Sub Private Function Evaluate(ByVal f As IStringFunction, ByVal arg As String) As String Evaluate = f.Evaluate(arg) End Function </code></pre> <p>Note that the class implementing the interface must have methods named <code>&lt;Interface&gt;_&lt;Method&gt;</code> as in the example above, not just <code>&lt;Method&gt;</code> as you'd expect.</p> <p>Download the <a href="https://dl.dropbox.com/u/6194904/2012/demo%20functions%20as%20arguments%20of%20functions.xlsm" rel="nofollow noreferrer">simple demo</a> or <a href="https://dl.dropbox.com/u/6194904/2012/demo%20functions%20as%20arguments%20of%20functions%20%28advance%29.xlsm" rel="nofollow noreferrer">intermediate demo</a> here</p>
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    1. COThat does not really help him, because he still has to write a seperate evaluation function for each class.
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    2. CO@Treb: maybe I don't understand the question, but I don't see what you mean. Each class represents a different function, so of course it has to have a separate evaluation function! Maybe if the problem could be re-stated it would be clearer.
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      1. USGary McGill
    3. COHi, I think this is the right answer. This is the way to do it in oo-languages, I just didn't know, that interfaces exist in VBA -- my fault. I remember seeing this technic the 1st time in *a little java*. But I have to test the proposed solution. At the moment I got an error message about not implementing the interface. Public Function apply(ByVal tmp As Variant) As Boolean End Function --- Implements IBooleanFunction Public Function apply(ByVal tmp As Variant) As Boolean apply = Application.IsText(tmp) End Function
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      1. USRoman Glass
 

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