deep-copy

问题 I am looking for a solution so far, i.e When user clicks on a link from his mail box My Application should open if My Application is already installed in his device without asking user to choose options with Just Once and Always .For example, clicking a URI in an email from a bank might result in a dialog asking the user whether to use the browser, or the bank's own app, to open the link, But in my case my application should open directly without asking to choose any option. I have

问题 In python, if I have x = y any modification to x will also modify y, and I can do x = deepcopy(y) if I want to avoid modifying y while working on x Say, instead, that I have: myFunc(): return y def main(): x = myFunc() Is it still the case that modifying x will modify y, or since it is a return from another function it will be like a deepcopy? 回答1: It will be a shallow copy, as nothing has been explicitly copied. def foo(list): list[1] = 5 return list For example: >>> listOne = [1, 2] >>>

问题 Suppose I have a class like the following: class A { virtual ~A(); ... } class B : public A { ... } class C : public A { ... } I also have a vector of unique_ptr which is declared this way: std::vector<std::unique_ptr<A>> vec; Assume vec is populated with unique_ptr to objects of derived class. What should I do if I want a deep copy of any of the vector elements, either b or c, and let a base class unique_ptr pointing to it? Originally I was doing things like std::unique_ptr<A> tmp = std:

问题 I have to implement generic extention deepclone method which can be used with any reference type instance to get its deep copy. I implement it as the following static class ClassCopy { static public T DeepClone<T> (this T instance) { if (instance == null) return null; var type = instance.GetType(); T copy; var flags = BindingFlags.FlattenHierarchy | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance; var fields = type.GetFields(flags); // If type is serializable - create

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I was using a custom method to deep clone objects the other day, and I know you can deep clone in different ways (reflection, binary

问题 I am using an instance class from a third-party DLL, and I need to do a deep copy on a particular instance. The class is not marked as Serializable , and therefore I can not use this suggested method using BinaryFormatter. How can I get a deep copy of this object without using serialization? 回答1: I've been using Copyable with great success. It uses reflection under the hood. It is open-sourced. Be sure to read Limitations and pitfalls to see if you can use it. 回答2: One suggestion is to use

问题 I'm doing a Simulated Annealing algorithm to optimise a given allocation of students and projects. This is language-agnostic pseudocode from Wikipedia: s ← s0; e ← E(s) // Initial state, energy. sbest ← s; ebest ← e // Initial "best" solution k ← 0 // Energy evaluation count. while k < kmax and e > emax // While time left & not good enough: snew ← neighbour(s) // Pick some neighbour. enew ← E(snew) // Compute its energy. if enew < ebest then // Is this a new best? sbest ← snew; ebest ← enew /

问题 The orderedDictionary instantiation is this: IOrderedDictionary orderedDictionary= gridview.DataKeys[index].Values; orderedDictionary is read only. How can I make a deep copy of orderedDictionary that is not read only? Serialization/deserialization doesn't work cause it also copies the read only part. 回答1: The easiest way would be to just copy the objects: var newDictionary = new OrderedDictionary(); foreach(DictionaryEntry de in orderedDictionary) { newDictionary.Add(de.Key, de.Value); }

问题 I have a main class called Bar that calls the class Foo, and I think I put in a deep constructor correctly The purpose of a deep copy constructor is to copy the contents of one object to another object and changing the copied object shouldn't change the contents of the original, correct? My code does that, but I don't understand why when I set the original object variable, the copying object doesn't contain that set variable, it just contains the default constructor variable. public class Bar

问题 Ok I have a XDocument BaseDocument = XDocument.Load(@".\Example\Template.xml"); and some DataStructure of XElements (inside the XDocument) that gets generated by a method. This is just an example: Dictionary<string, List<XElement>> ElementMap = GetElementMapping(BaseDocument); I want to make a deep copy of both, Is there a more efficient way than, XDocument copy = new XDocument(BaseDocument); Dictionary<string, List<XElement>> copyElementMap = GetElementMapping(copy); to copy the