deep-copy

问题 I need to make a deep copy of a UIView containing several subviews. Please help me figure out how to do this? I've done some searching on google and SO and not found anything that does what I want. Explanation for those who would like to know why: I have an infinitely scrolling UIScrollView where, of course, the contents repeat. Each 'set' of the contents (for example, say 26 UIButtons labeled A-Z) is contained inside one view. This is the view I need to make a deep copy of, so that I can

问题 a linear linked list is a set of nodes. This is how a node is defined (to keep it easy we do not distinguish between node an list): class Node{ Object data; Node link; public Node(Object pData, Node pLink){ this.data = pData; this.link = pLink; } public String toString(){ if(this.link != null){ return this.data.toString() + this.link.toString(); }else{ return this.data.toString() ; } } public void inc(){ this.data = new Integer((Integer)this.data + 1); } public void lappend(Node list){ Node

问题 Let's I have next javascript object. Now I want clone it but without some fields. For example I want cloned object without field "lastName" and "cars.age" Input { "firstName":"Fred", "lastName":"McDonald", "cars":[ { "type":"mersedes", "age":5 }, { "model":"bmw", "age":10 } ] } Output (cloned) { "firstName":"Fred", "cars":[ { "model":"mersedes" }, { "model":"bmw" } ] } I can do something like var human = myJson var clone = $.extend(true, {}, human) delete clone.lastName _.each(clone.cars,

问题 This error occurs during run time, and I'm not sure what's causing it - the code looks correct to me. #include <iostream> #include <string> using namespace std; struct Room { int d_noSeat; bool d_hasProjector; Room() = default; Room(const Room& r); }; class Event { Room* d_room; std::string d_name; public: Event(); Event(const Event& e); ~Event(); void set(Room r, const std::string& name); void print(); }; Event::Event() : d_room(0), d_name("") {}; void Event::print() { std::cout << "Event: "

问题 I know that serializing an object is (to my knowledge) the only way to effectively deep-copy an object (as long as it isn't stateful like IO and whatnot), but is one way particularly more efficient than another? For example, since I'm using Rails, I could always use ActiveSupport::JSON , to_xml - and from what I can tell marshalling the object is one of the most accepted ways to do this. I'd expect that marshalling is probably the most efficient of these since it's a Ruby internal, but am I

问题 Kahn proposed an algorithm in 62 to topologically sort any DAG (directed acyclic graph), pseudo code copied from Wikipedia: L ← Empty list that will contain the sorted elements S ← Set of all nodes with no incoming edges while S is non-empty do remove a node n from S add n to tail of L for each node m with an edge e from n to m do remove edge e from the graph # This is a DESTRUCTIVE step! if m has no other incoming edges then insert m into S if graph has edges then return error (graph has at

问题 Lets say I have this class public class Employee { public string FirstName { get; set; } public string LastName { get; set; } public bool isActive { get; set; } } And use it like this: List<Employee> Employees = new List<Employee>(); Employees.Add(new Employee { FirstName = "firstname", LastName = "lastname", isActive = true }); List<Employee> EmployeesCopy = new List<Employee>(Employees); EmployeesCopy[0].isActive = false; Why does change in isActive property of EmployeesCopy also modify

问题 I've searched everywhere and found similar questions with answers that didn't really address my issue so I apologize if this seems like a repeat, but it appears from my experimenting that jQuery's deep copy function doesn't actually work as it's described (or maybe I'm misreading its description). Here's an example demonstrating the problem I'm having: http://jsfiddle.net/wcYsH/ Or this for download: https://github.com/kevroy314/jQuery-Extend-Test Why does the data in the previous copy get

问题 A question about python deepcopy and shallow copy. the post at What is the difference between a deep copy and a shallow copy? cannot help me. why e.g. 1 's sum is 6 not 10 ? e.g.1 : kvps = { '1' : 1, '2' : 2 } theCopy = kvps.copy() # both point to the same mem location ? kvps['1'] = 5 sum = kvps['1'] + theCopy['1'] print sum output sum is 6 e.g.2 : aList = [1,2] bList = [3,4] kvps = { '1' : aList, '2' : bList } theCopy = kvps.copy() # both point to the same mem location ? kvps['1'][0] = 5 sum

问题 What exactly is the relationship between pickle and copy.deepcopy ? What mechanisms do they share, and how? It is clear the two are closely-related operations, and share some of the mechanisms/protocols, but I can't wrap my head around the details. Some (confusing) things I found out: If a class defines __[gs]etstate__ , they get called upon a deepcopy of its instances. This surprised me at first, because I thought they are specific to pickle , but then I found that Classes can use the same