Modular•5mo ago

Working LinkedList using pointers

https://github.com/MVPavan/mojos/blob/master/learn/dsa/my_linked_list.mojo I have created linked list in Mojo, it runs fine with all the methods and deletions. However debug is failing, any idea why ? Also any feedback on deletion, memory leaks is also appreciated.

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mojos/learn/dsa/my_linked_list.mojo at master · MVPavan/mojos

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1 Reply

rd4com•5mo ago

Hello @PavanMV , the current __moveinit__ implementation does not free existing.data yet (remember, you move what is in some place, to another place, have to free the previous space)

#current implementation
fn __moveinit__(inout self, owned existing:Self):
    self = Self()
    self.data = self.data.alloc(1)
    move_pointee(src=existing.data, dst=self.data)
    self.next_ptr = existing.next_ptr
    self.prev_ptr = existing.prev_ptr
    #need to free existing.data

#current implementation
fn __moveinit__(inout self, owned existing:Self):
    self = Self()
    self.data = self.data.alloc(1)
    move_pointee(src=existing.data, dst=self.data)
    self.next_ptr = existing.next_ptr
    self.prev_ptr = existing.prev_ptr
    #need to free existing.data

It could be a good idea to sort of do it again (re put-together the parts), and each time before adding the next feature/part, make sure that the tests passes 👍 That way you'll catch and fix the 'bugs' as they come and it is easier to think.

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Working LinkedList using pointers