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POC++ At runtime check whether function signature exists?
 

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    <p>The current situation is this: I am going through some code re factoring </p> <p><img src="https://i.stack.imgur.com/5dWvc.png" alt="enter image description here"></p> <p>If you look at the image the current situation is that I have a virtual method <code>setData(int ID);</code> now we want to change that to a virtual method <code>setData(dataObj aObj);</code></p> <p>But doing so, is a long process since, our <code>foo</code> object has been inherited by tons of classes. So, we want to gradually make the code change.</p> <p>As such, what I need to do is to check if one of the inherited classes has implemented <code>setData(dataObj aObj)</code> call that class, else call the other previous function signature <code>setData(int ID);</code> The problem is further complicated by the fact that, <code>FOO</code> class provides a default <code>setData(int ID)</code> previously and not all classes that inherit from <code>FOO</code> thus may/may not need to implement <code>setData</code> and their implementations do vary wildly. </p> <p>I have already looked at <a href="https://stackoverflow.com/questions/8814705/how-to-check-if-the-function-exists-in-c-c">How to Check if the function exists in C/C++</a> unfortunately, that does not answer my questions. </p> <p>In some of the posts I have seen people use templates, that's not an option for me, since this needs to be done at runtime. The other options seems to suggest linking /mangling tricks with GCC etc. I need to build my code to be platform and compiler independent. So that's not an option either. </p> <p>Any more suggestions, the only possible close solution seems to be <a href="https://stackoverflow.com/a/8814800/1376317">https://stackoverflow.com/a/8814800/1376317</a> But I am really not sure how to implement this in my workflow, or whether this is even relevant to my problem. </p>
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    1. COYou cannot. Instead, fix your overly complicated design (which is funny; you mentioned it yourself: “the problem is further complicated by the fact that …”).
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    2. COOut of curiosity: What is the reason this has to happen at runtime?
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    3. COIs that mspaint horror that I see? Just for your own sanity, check [inkscape](http://www.inkscape.org/en/) out for such diagrams. In the very least, after you realized the texts in the final image are too small, you can almost instantly resize them.
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