mutable

I am using Entity Framework in my application. I implemented with the partial class of an entity the IEquatable<T> interface: Partial Class Address : Implements IEquatable(Of Address) 'Other part generated Public Overloads Function Equals(ByVal other As Address) As Boolean _ Implements System.IEquatable(Of Address).Equals If ReferenceEquals(Me, other) Then Return True Return AddressId = other.AddressId End Function Public Overrides Function Equals(ByVal obj As Object) As Boolean If obj Is Nothing Then Return MyBase.Equals(obj) If TypeOf obj Is Address Then Return Equals(DirectCast(obj, Address

1 import sys 2 3 class dummy(object): 4 def __init__(self, val): 5 self.val = val 6 7 class myobj(object): 8 def __init__(self, resources): 9 self._resources = resources 10 11 class ext(myobj): 12 def __init__(self, resources=[]): 13 #myobj.__init__(self, resources) 14 self._resources = resources 15 16 one = ext() 17 one._resources.append(1) 18 two = ext() 19 20 print one._resources 21 print two._resources 22 23 sys.exit(0) This will print the reference to the object assigned to one._resources for both one and two objects. I would think that two would be an empty array as it is clearly setting

I'm new to common lisp, so hope someone would clarify this to me: say we have a list and want to add an item with push to modify it: CL-USER> (defparameter xx '(1 2 3)) XX CL-USER> xx (1 2 3) CL-USER> (push 100 xx) (100 1 2 3) CL-USER> xx (100 1 2 3) as expected. But when i try to do the same with the function, it doesn't modify a list: CL-USER> (defun push-200 (my-list) (push 200 my-list)) PUSH-200 CL-USER> (push-200 xx) (200 100 1 2 3) CL-USER> xx (100 1 2 3) so i tried to compare argument and my list like this: CL-USER> (defun push-200 (my-list) (format t "~a" (eq my-list xx)) (push 200 my

I'm trying to recurse down a structure of nodes, modifying them, and then returning the last Node that I get to. I solved the problems with mutable references in the loop using an example in the non-lexical lifetimes RFC . If I try to return the mutable reference to the last Node , I get a use of moved value error: #[derive(Debug)] struct Node { children: Vec<Node>, } impl Node { fn new(children: Vec<Self>) -> Self { Self { children } } fn get_last(&mut self) -> Option<&mut Node> { self.children.last_mut() } } fn main() { let mut root = Node::new(vec![Node::new(vec![])]); let current = &mut

This question already has an answer here: How to copy a python class? 8 answers I have been playing with the deepcopy function and the copy function and I get the same issue with both of them. It is like the copy was a reference (or a pointer) instead of a proper copy. I am working with data records (classes) in Python, maybe it could be that.. I show you an example: >>> import copy >>> class player1: ... age = 23 ... score = 1 >>> class player2: ... age = 14 ... score = 2 >>> player3 = copy.deepcopy(player1) I print the parameters. >>> print player1.age, player1.score 23 1 >>> print player2