I’m running into situations where it would be useful to go beyond what I understand about functions
I have multiple functions that are identical except they each use data from different arrays,
Is there a way to reverse this? Ie
function_name(val, val, identifier_of_array);
Instead of what I have now, multiple variations of;
function_name_for_array_a(val, val);
I’ve encountered my dilemma on various parts(functions) in my program, to generalise
I’m taking two unit8_t arrays, chopping them up and reassembling them as a new array or printing the result.
As my program grows the combinations have got out of hand.
Ok, pass by reference took me towards this, which I think is ok.
uint8_t Array;
uint8_t val;
void func(theray,val){
~the meat~;
}
func(Array, val);
I thought I had tried that but obviously not.
Thank you.
uint8_t Array;
That is an array with zero elements; it will result in undefined behaviour of your application at the moment that you assign a value to e.g. Array[0].
I’m not sure if you know the size of the array. It needs to be fixed, e.g.
// array with 20 elements
uint8_t Array[20];
Note that if the array holds text (e.g. “Hello”), the above can hold up to 19 characters to leave space for the terminating nul character.
Mattty5:
Ok, pass by reference took me towards this, which I think is ok.uint8_t Array;
uint8_t val;void func(theray,val){
~the meat~;
}func(Array, val);
that works because it's referring to an array of integers without specifying the # of elements. looks like a synonym for a pointer
the more common approach is
void func(int *buf, int size){
}
gcjr:
the more common approach isvoid func(int *buf, int size){
}
I beg to differ. The more common approach would be
void func(uint8_t* array, size_t size) {
}
yes type
but the point is "uint8_t arr " vs "uint8_t *arr"
sometimes a message packet is defined
struct TlvPkt_s {
int type;
int length;
int data [];
};
to provide a pointer to the data in a packet of unknown length
Thank you all very much!
I created some extra confusion by not showing that I do define my array sizes, some are of fixed length, some have a maximum size, I pass the actual length in both cases.
I was trying to simplify my problem and went too far, sorry!
As I press on I find I have one more related question...
How might I implement a similar approach with struct as mentioned above?
Ie
void function(struct_id){
// all variables inside this function read or write to //struct_id.data_id
}
Think I’ve got it,
struct Data {
float a;
uint8_t b;
uint8_t c[12];
} ;
struct Data V;
struct Data T;
void function(Data &Vals){
//do stuff to Vals.a //b //c
}
//
function(V);
function(T);
//