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POHow to declare structures of data that should only be used in a certain context, C++
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  1. POHow to declare structures of data that should only be used in a certain context, C++
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    copied!<p>I'm having a rather general design problem and would like to solve it nicely. I'm writing remote control drivers in an embedded C++ project. There will be two types of remote control: joystick or radio. As I'd like the actual remote controller used to be transparent to an user-programmer, I'm also providing a base class for the two. So I'm going to have:</p> <pre><code>class RemoteControl {}; class JoystickControl : public RemoteControl {}; class RadioControl : public RemoteControl {}; </code></pre> <p>I'd like RemoteContol to just have one public method: <code>RemoteControl.getInput()</code>. This method should return a structure of data in common format, eg. <code>RCInput</code>, so the above method's declaration would be:</p> <pre><code>class RemoteContol { virtual RCInput getInput(); }; </code></pre> <p>Now, what's the best way to implement RCInput to be able to pass it to other classes' objects? I thought an inner class / structure might be a solution, but I never used it yet so can someone please provide an example of implementation and usage?</p> <p>Thanks in advance.</p> <p><strong>EDIT:</strong> What I did before was (could be references, this is not important at the moment):</p> <pre><code>typedef struct { int a; int b; } RCInput; class RemoteContol { public: virtual RCInput getInput() { return rcInput; } private: RCInput rcInput; }; </code></pre> <p>But I thought this way I'm allowing users to create their own structures of type RCInput also not related to RemoteControl, so I was looking for a better design. But maybe there isn't any.</p>
 

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