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This won t work, because you cannot write Valid10 as I ve discussed previously There would be no place or situation where the visitUnknown method would be called All the methods would have the default behavior, which is not what you want You want to give users of the API a proper tool for various situations They should be notified that there is an unexpected element in the expression tree Only then should they decide what to do with it: whether to report it as an error, use it as an indication that their code should return false, or crawl through it and see what s underneath it.

While this simple delay-loop approach works perfectly well for simple projects like this, it can become a problem if you want to add a bit of intelligence to the system later. Whenever the Arduino is waiting for the delay() function at the end of the loop to finish, it is effectively locked: it can t process other commands even though the CPU isn t doing anything useful at the time. It s good practice to avoid unnecessary delay loops in your sketches if possible, so we ve also included another version of the same sketch that has been written using the Aiko application framework. Aiko is an Arduino library that is designed to make it easy to write event-driven sketches consisting of many subsections that may either run independently or interact with each other in a complex way. Although it s overkill for this little project, it s a good exercise to compare the simple delay-loop approach shown previously to a version of the same sketch written using Aiko. To use Aiko in your sketches, you need to download and install it using the instructions shown at the development repository at github.com/geekscape/Aiko. Once it s installed you ll be able to compile the following Aiko-ised version of the sketch. #include <AikoEvents.h> using namespace Aiko; int frameInterval = 300; int focusPin = 5; int shutterPin = 6; int ledPin = 13; void setup() { pinMode(focusPin, OUTPUT); digitalWrite(focusPin, LOW); pinMode(shutterPin, OUTPUT);

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All these possibilities are valid use cases and should be supported, preferably in a way that allows the users of the API to make conscious decisions at the time of writing their code and that remain valid even if the API is enhanced with new elements and functionality A possible enhancement is to allow the visitor implementation to decide whether unknown elements should be traversed or not by a return value of the visitUnknown method: public abstract class Visitor/*10*/ { public boolean visitUnknown(Expression e) { throw new IllegalStateException("Unknown element faced: " + e); } public void visitPlus(Plus s) { if (visitUnknown(s)) { sgetFirst()visit(this); sgetSecond()visit(this); } } public void visitNumber(Number n) { visitUnknown(n); } } This way you get the default behavior for unknown elements, but can also decide to do nothing or even perform a deep default visit.

// Delay between pictures (in seconds) // Reed relay on digital pin 5 // Reed relay on digital pin 6 // LED connected to digital pin 13

One of the greatest dangers in software development is the process of feature creep or scope creep Let s say you have an idea for an interesting feature that s at least somewhat related to what you re working on, so you go ahead and add it But once that feature is in place, you start coming up with ideas for ways to build on it and enhance it with even more features and capabilities, and you start writing more and more code to support these features Eventually, you end up with a huge tangled mess that s strayed significantly from its original purpose However, when you re writing code for a modular system like Django, it s often a bit easier to spot the warning signs of feature creep and get back on track.

With an API like this, you can perform every task I ve asked for so far, even counting the amount of numbers in the expression tree: private class CountNumbers extends Visitor/*version10*/ { int cnt; @Override public boolean visitUnknown(Expression exp) {.

digitalWrite(shutterPin, LOW); pinMode(ledPin, OUTPUT); digitalWrite(ledPin, LOW);

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