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PO
 

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  1. PO
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    <p>If you use templates you need to know AT COMPILE TIME which type(s) you're using. That's just the nature of templates (templates look like code that's dynamic at runtime, but in reality it's just shorthand that tells the compiler what versions of the function to compile and include in the object code). Best case senario is something like this:</p> <pre><code>template &lt;class T&gt; void DoSomethingWithMyInterface(MyInterface&lt;T&gt; X) { //do something } ... switch (MyObject.GetTypeCode()) { case TYPE1: DoSomethingWithMyInterface&lt;type1&gt;(MyObject); break; case TYPE2: DoSomethingWithMyInterface&lt;type2&gt;(MyObject); break; case TYPE3: DoSomethingWithMyInterface&lt;type3&gt;(MyObject); break; case TYPE4: DoSomethingWithMyInterface&lt;type4&gt;(MyObject); break; } </code></pre> <p>I actually use this situation a lot. I write templated c++ code that does the processing for a dynamically typed language. That means that the top level language doesn't know the data types until run time, but I need to know them at compile time. So I create this "TypeSwitch" (I actually have a fancy reusable one). That looks at the datatypes at run time and then figures out which of the already compiled template functions to run. </p> <p>Note - that this requires me knowing all the types I'm going to support before hand (and I do) and the switch statement actually causes the compiler to generate all of the code that could ever be executed. Then at runtime the right one is selected.</p>
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    1. POPassing objects of different types with the same interface
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    1. USmiked
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      1. VTUpMod
    1. COThis is an interesting solution and one I think may solve the problem in this case. The client is working with a small subset of the various objects which wouldn't require a massive switch statement.
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      1. USLee Winder
 

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