Arduino how to make function that returns fixed size array

Question

I'm trying to create function that returns an array but when using

int x[5];

void setup() {
  x = getX();
}

int * getX(){
  return {1,1,1,1,1};
}

I get: incompatible types in assignment of 'int*' to 'int [5]'

To make assignment work on arrays you have to use std::array. In C there is no such feature like assignment between arrays so you have to use C++ specific feature. — Marek R
– Marek R, Commented Dec 17, 2019 at 13:20

Alphastrick · Accepted Answer · 2019-12-17 13:54:02Z

1

Your Arduino-IDE may not support C++'s std::array like mentioned in a comment, but you can do it like:

int* get() {
    static int my_array[] = {1, 1, 1, 1, 1};
    return my_array;
}

It's no possible to reasign an array like you've tried in your setup function.

Consider using:

int* x = nullptr;

void setup() {
    x = get();
}

I've to point out, that this is not best practice. Maybe you can give some more information to find a better solution.

answered Dec 17, 2019 at 13:41

Alphastrick

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