Hey,

You can only return felt, so if you want to return an array you have to use another `storage_var`.  For exemple if I want to return an array you may do something like this:
```
struct Array {
    array_index: felt,
    len: felt,
}

@storage_var
func get_array() -> (array: Array) {
}

@storage_var
func array(array_index: felt, index: felt) -> (value: felt) {
}
```
As you can see, the `storage get_array()` will return a struct of type `Array` which contain the `array_index and len` of the array. Then use it in `storage_var array()`  to get the corresponding value. Since you have the `len` you can create a recursion to the storage var to get all the element of the array of index `array_index`.


Hey guys,
I got this error `The return type of storage variables must be a felts-only type (cannot contain pointers)` when when compiling this:
```
struct MultipleLinear {
    number_of_features: felt,
    coef_s: felt*,
    intercept_: felt,
}
@storage_var
func solution_storage(address: felt) -> (solution: MultipleLinear) {
}
```
Apparently **storage can only return felt**? So what would be the solution if I want it to return an array or a struct that contains felt*?

trangnv

storage for array

hi, i used the starkgate bridge from stark to eth one hour ago. Withdrawal has not occurred yet. How many hours does the process take? My tx hash is: <address>cfa0c02d013658804505506

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

How many time does it take for stark to eth starkgate bridge process?

 I was able to run those commands without setting up a StarkNet account

When you run warp deploy or warp invoke, which account is paying for the tx fees on the Goerli testnet?

I'm new to Cairo and I want to know what is the difference when I write `let x = 1;` and `tempvar x = 1;`. Is there any difference in Cairo Lang between let and tempvar?

Cairo: let vs tempvar what is the difference?

Can we deploy kakarot zkEVM on StarkEx and then run multiple solidity dapps on top of it?

Deploying kakarot evm on starkEx

How do I create AX (ArgentX) contract using starknetjs?

Hey folks, do you know how I could read a felt* from ap?

I want to do something like this:

```rs
    let (hello : felt*) = alloc();
    tempvar world : felt* = hello;
    let world_like : felt* = [ap-1];
```

when I do tempvar world = hello, I ensure I add hello (the pointer) to [ap] and then I increase ap so world_like = [ap-1] should be the same thing than world

But I get this error:

```
Cannot assign an expression of type 'felt' to a reference of type 'felt*'.
    let world_like : felt* = [ap-1];
```

When doing a similar code:

```rust
        let (func_pc: felt*) = get_label_location(storage_var);
        _prepare_call(pedersen_ptr, range_check_ptr, len_inputs, inputs + len_inputs);
        call abs ap[11 - 6 * 2];
```

I get ```
Cannot apply subscript-operator to non-pointer, non-tuple type 'felt'.
        call abs ap[11 - 6 * 2];  // removing alloc_locals by calling ap[11-6*2] ?
```

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

how I could read a felt* from ap in Cairo lang?

Hey guys! Does anybody have an idea what is `get_caller_address` returning on an L1 handler call?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Popular tags

storage for array

1 answers

Your answer

Related

You may find useful