Hello, I'm new in arduino. I have two arrays and would like to return the first element shared. I used this setup program with a function, but it does'nt work as I guess :(. Program: ///////////////////////////////////////////////////////////////////////////// int tag_test[3] = {1, 2, 3}; int…

econjack: I think templates might be hard for a beginner who says he's new to Arduino. Perhaps something a little simplier: The alternatives of passing data around using global arrays and having manual loop indices are worse than using templates in my eyes. Templates are not harder than the size…

PieterP: ⁽*⁾ Because raw C-arrays are somewhat special, passing them by value would also be much more involved than passing them by reference. Anyway, passing them by reference is definitely the easiest and the most efficient option. I would argue the opposite, the compiler manages passing by ref…

arduino_new: I would argue the opposite, the compiler manages passing by reference by just passing the pointer by value underhood. So, passing by reference is not more efficient, since the compiler needs to check for NULL too. I mean passing the array by value, i.e. copying the entire array. It …

PieterP: I mean passing the array by value, i.e. copying the entire array. It is more involved because you would have to wrap them in a struct like std::array does. Using a reference is cheaper than copying the array, not cheaper than passing the array by pointer (which is indeed the default). B…

arduino_new: Can you give an example where the function make a copy of an entire array when you pass it an array? Now when you pass a variable by reference, the compiler make sure it's not NULL right? That's the point I was trying to make, you cannot pass an array by value unless you wrap it: […

Perhaps I misunderstood your assertion earlier. However, consider the following cases: int Geta(int *a); int Getb(int &a); int Getc(int *arr); int Getd(int (&arr)[5]); //calling variable int num; Geta(&num); //pass by value as pointer Getb(num);//pass by reference //calling array int array[5]; Ge…

arduino_new: Were you arguing that Getb() and Getd() - both are passing by reference - would be more efficience than Geta() and Getc()? No, the calling conventions are exactly the same, all of them pass a pointer under the hood. Just the syntax and usage are different for pointers and references…

Nice discussion for CS 201. But, wonder what OP gets out of it.

PieterP: I was talking about passing an array by value[/b] (i.e. creating a deep copy) versus passing an array by reference (or pointer for that matter). [/quote] But we already established that array cannot be passed by value ie, be deep copied. Also, I think containers are irrelevant in this …

arduino_new: But we already established that array cannot be passed by value ie, be deep copied. Only C-arrays cannot be deep-copied. C++ arrays can. I showed you an example that does that, and std:array behaves equivalently. arduino_new: Also, I think containers are irrelevant in this catego…

how to compare if two arrays share at least one element

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econjack January 6, 2020, 3:23am 27

@Pieterp--I agree. Everyone learns best by doing, not just reading. Still, when both work together it can make learning new concepts easier.

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how to compare if two arrays share at least one element

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