deep-copy

In Vuex I would like to take a snapshot / clone of an object property in the tree, modify it, and later possibly roll back to the former snapshot. Background: In an application the user can try out certain changes before applying them. When applying the changes, they should effect the main vuex tree. The user can also click «cancel» to discard the changes and go back to the former state. Example: state: { tryout: {}, animals: [ dogs: [ { breed: 'poodle' }, { breed: 'dachshund' }, ] ] } User enters »Try out« mode and changes one breed from poodle to chihuahua . She then decides either to

Does Perl 6 have a built-in tool to make a deep copy of a nested data structure? Added example: my %hash_A = ( a => { aa => [ 1, 2, 3, 4, 5 ], bb => { aaa => 1, bbb => 2 }, }, ); my %hash_B = %hash_A; #my %hash_B = %hash_A.clone; # same result %hash_B<a><aa>[2] = 735; say %hash_A<a><aa>[2]; # says "735" but would like get "3" my %A = ( a => { aa => [ 1, 2, 3, 4, 5 ], bb => { aaa => 1, bbb => 2 }, }, ); my %B = %A.deepmap(-> $c is copy {$c}); # make sure we get a new container instead of cloning the value dd %A; dd %B; %B<a><aa>[2] = 735; dd %A; dd %B; Use .clone and .deepmap to request a copy

If all the objects within the bean implement Serializable interface, will BeanUtils.cloneBean() do a deep copy? kosa No, cloneBean() does shallow copy only. If you want deep copy. You may refer this link which has technique to do deep copy. Use SerializationUtils.clone method from the Apache Commons Lang for the deep copy . It copies the entire class hierarchy. SerializationUtils.clone(object); There is also another java library which supports both shallow cloning and deep cloning. It offers deep cloning without the need to implement Serializable. Here 来源： https://stackoverflow.com/questions

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: " << d_name; if (d_room != 0) { std::cout << " in size " << d_room->d_noSeat; if (d_room->d_hasProjector

This question already has answers here : Copying a struct containing pointers to CUDA device (3 answers) Programming with CUDA I am facing a problem trying to copy some data from host to gpu. I have 3 nested struct like these: typedef struct { char data[128]; short length; } Cell; typedef struct { Cell* elements; int height; int width; } Matrix; typedef struct { Matrix* tables; int count; } Container; So Container "includes" some Matrix elements, which in turn includes some Cell elements. Let's suppose I dynamically allocate the host memory in this way: Container c; c.tables = malloc(20 *

I would like to do a deep copy on objects including all the attributes. The experiment_old is has 10 trials. And I want to copy everything to experiment_new with the 10 trials. experiment_old should also keep the 10 trial info. However, all the cases I tried below, they copy everything well, but experiment_old does not have the 10 trials info. They just show up on experiment_new. What is the best way to do deep copy for these cases. case 1: @experiment_new = Experiment.create(@experiment_old.attributes.merge(:trials => experiment_old.trails)) case 2: @experiment_new = Marshal.load(Marshal.dump