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POC++ How to I replace this if...else statement?
 

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  1. POC++ How to I replace this if...else statement?
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    <p>I have the following C++ code (simplified version):</p> <pre><code>class Shape { bool isCircle = false; bool isSquare = false; } class Circle : public Shape { // some special members/methods } class Square : public Shape { // some special members/methods } class CAD { virtual DrawCircle(Circle * circle) = 0; } class SWX : public CAD { virtual DrawCircle(Circle * circle){// do some stuff that draws circle on SWX system} } class PRO : public CAD { virtual DrawCircle(Circle * circle){// do some stuff that draws circle on PRO system} } int main() { Circle * circle = new Circle(); circle-&gt;isCircle = true; Square * sq = new Square; sq-&gt;isSquare = true; vector&lt;Shape*&gt; shapes; shapes.push_back(circle); shapes.push_back(sq); SWX * swx = new SWX(); for( int i = 0 ; i &lt; shapes.size() ; ++i ) { if( shapes[i]-&gt;isCircle ) { SWX-&gt;DrawCircle((Circle*)(shapes[i])); } else if( shapes[i]-&gt;isSquare ) { SWX-&gt;DrawSquare((Square*)(shapes[i])); } } </code></pre> <p>I wish to remove the need for if...else (if at all possible within the constraints stated below). </p> <p>My constraints right now are:</p> <ul> <li>The CAD and derived classes are ginormous classes with various external dependencies. </li> <li>The CAD classes cannot be merged with the Shape and derived classes (that would have been ideal, since then I can use polymorphism to solve my problem), since other projects/classes depend on the Shape classes and cannot depend on the CAD classes.</li> <li>There are more than a dozen Shape-derived classes with a half dozen CAD-derived classes and this if...else is happening in numerous locations - so it would help if any solution is simple to understand (easier to convince my teammates to change legacy code).</li> </ul> <p>Any suggestions/comments/solution you have would be most welcome.</p>
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    1. COI'm not at all a C++ expert, but is it possible to have a `DrawShape` method (instead of individual `DrawSquare` and `DrawCircle` methods) on each `CAD`-derived class and just have the `if-else` in there?
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