ivellapillil
ivellapillil
PostsComments
MModular
Created by ivellapillil on 10/24/2024 in #questions
Preserving mutability when passing to function
How to make pointer passed to a function preserve/transmit its mutability? 
    var a_instance = A(12)
    var ref_a = Pointer.address_of(a_instance) 
    
    def change_value(p: Pointer[A]):
        p[] = 15 # <- Error 

    change_value(ref_a)
    ref_a[] = 15 # Works
    var a_instance = A(12)
    var ref_a = Pointer.address_of(a_instance) 
    
    def change_value(p: Pointer[A]):
        p[] = 15 # <- Error 

    change_value(ref_a)
    ref_a[] = 15 # Works
Or is it a conscious constraint on Pointer and we should use UnsafePointer or Arc here?
42 replies
MModular
Created by ivellapillil on 7/23/2024 in #questions
Bug or optimisation
The following code: 
struct A:
    fn __init__(inout self): ...
    
fn main(): 
    print(UnsafePointer.address_of(A()) == UnsafePointer.address_of(A())) # Prints True
struct A:
    fn __init__(inout self): ...
    
fn main(): 
    print(UnsafePointer.address_of(A()) == UnsafePointer.address_of(A())) # Prints True
indicates that both initialised empty struct has the same address. Are empty structs automatically "singleton"? Or is it a bug in the compiler? I am using Mac M1.
7 replies
MModular
Created by ivellapillil on 5/15/2024 in #community-showcase
Online book on Mojo
https://ivellapillil.github.io/mojo
35 replies