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PO"Stealth" class to enclose a variable in C++
 

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  1. PO"Stealth" class to enclose a variable in C++
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    <p>I'm currently using two identical libraries for parsing commands received in Arduino (via <a href="http://en.wikipedia.org/wiki/Internet_protocol_suite" rel="nofollow">TCP/IP</a> and via Serial). All the difference is in the object type being passed to the parser.</p> <pre><code>//main.cpp SerCmd sCmd; EthCmd eCmd; void setup() { sCmd.listen("#",dumpCmd); eCmd.listen("#",dumpCmd); } void loop() { HardwareSerial SerClient = Serial.available(); EthernetClient EthClient = Server.available(); eCmd.read(SerClient); sCmd.read(EthClient); } //SerCmd.h class SerCmd { public: void read(HardwareSerial &amp;dataObj); } //EthCmd.h class EthCmd { public: void read(EthernetClient &amp;dataObj); } </code></pre> <p>It's obvious that:</p> <ul> <li>The two objects are nearly identical, and they share lots of common methods (sCmd, eCd).</li> <li>The two classes (SerCmd, EthCmd) can be replaced with a single class to reduce the <a href="http://www.arduino.cc/en/Tutorial/Sketch" rel="nofollow">sketch</a> size.</li> </ul> <p>How can I create a "stealth" class which could be passed to the <code>read()</code> method, while still addressing any of the two different objects underneath?</p> <p>What's the common practice used in such situations?</p> <p>So far, I am able to compile the below code, but cannot initialize any methods:</p> <pre><code>class Communication {}; HardwareSerial *SerClient; Communication *Comm; void setup() { Comm = (Communication*) SerClient; //Comm.begin(9600); //Error: request for member 'print' in 'Comm', //which is of non-class type 'Communication*' } </code></pre>
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    1. PTQuestion
    1. USPeter Mortensen
    1. USFlegmatoidZoid
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    1. COAre you aware of the concept of inheritance?
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      1. PO"Stealth" class to enclose a variable in C++
      1. USn.m.
    2. COAbout the code: you should use `->` instead of `.` since `Comm` is a pointer.
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      1. PO"Stealth" class to enclose a variable in C++
      1. USsoon
    3. COIMHO class `Communication` should be an abstract base class for `HardwareSerial` and `EthernetClient` to achieve what you want ...
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      1. PO"Stealth" class to enclose a variable in C++
      1. USπάντα ῥεῖ
 

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