cloning

问题 its easier to explain in code so here Object anObj; anObj = new MyObj(); anObj = new Rectangle(); anObj.clone();//this doesnt exist because its on the root Object class what can i use instead of the Object.clone() method in this example? ----------------------- extra info ------------------------------ I have added extra info but it seems to have gone in the middle of all the answers, so here it is again so it can be read. Hi all these are all really helpful on topic of cloning or copying,

问题 use generic_array::*; // 0.12.3 use num::{Float, Zero}; // 0.2.0 #[derive(Clone, Debug)] struct Vector<T, N: ArrayLength<T>> { data: GenericArray<T, N>, } impl<T, N: ArrayLength<T>> Vector<T, N> where T: Float + Zero, { fn dot(&self, other: Self) -> T { self.data .iter() .zip(other.data.iter()) .fold(T::zero(), |acc, x| acc + *x.0 * *x.1) } fn length_sq(&self) -> T { self.dot(self.clone()) } } error[E0308]: mismatched types --> src/lib.rs:21:18 | 21 | self.dot(self.clone()) | ^^^^^^^^^^^^

问题 I have 3 select boxes and all are having same value (clones) & created on change of reference table selection. now i want to manage the selection on the three Constraint dropdown so that it 'Does not show the selected one in other two' and user cant select the same from two. how to do it in jquery? Code is - <tr> <td> Reference Table:</td> <td> <select id="tableCombo" onchange="jQuery.ajax({type:'POST',data:'tableCombo=' + this.value, url:'/GryphonMonitor /load/getColumns',success:function

问题 I defined next class with virtual properties: public class Order: BaseEPharmObject { public Order() { } public virtual Guid Id { get; set; } public virtual DateTime Created { get; set; } public virtual DateTime? Closed { get; set; } public virtual OrderResult OrderResult { get; set; } public virtual decimal Balance { get; set; } public virtual Customer Customer { get; set; } public virtual Shift Shift { get; set; } public virtual Order LinkedOrder { get; set; } public virtual User CreatedBy {

问题 I have three drop downs containing data, these three drop downs get cloned after the user select the four drop down. my aim was to disable each drop down once the user has selected the data which works fine. Now the problem is after the three drop down gets cloned for the second time the previous three drop downs enable themselves when they should still unable for the user to select. my solution to be is every time the user select the fourth drop down which clone the previous three, i would

问题 I have a page with a few silverlight embed objects. One player is visible and all others are hidden (display: none). When I click a thumbnail the code clones the corresponding, hidden object and replaces the visible player with this cloned object. This works fine in Firefox, Chrome and IE9, but in IE8 it doesn't work properly. The visible player gets replaced, but this results in a big white empty silverlight player. If you right-click this white element, it shows a silverlight context menu,

问题 I need to clone .png image data loaded from server in AS3, so that I am not required to load same data again and again from server. After a search on cloning image data in AS3 I was able to find following code over internet clone = new Bitmap(Bitmap(this._loader.content).bitmapData.clone() ) By using this code I am able to clone bitmap data but the problem which I am facing is that my png background is transparent. If I typecast loaded png data to bitmap my icons background becomes white. Any

问题 For a class with an array field Josh says if the clone method merely return super.clone(), the resulting class instance will have the correct values in primitive fields, but its array field will refer to the same array as the original class instance. Modifying the original will destroy the invariants and vice-versa. He used the example of custom Stack implementation, I am using a simple Student class class Student implements Cloneable { private String name; private int age; private int[]

问题 Folks, is there a way to clone a Lua state? In my game application the initialization procedure of the Lua virtual machine is pretty heavy(about 1 sec, since many scripts are loaded at once). I have a separate Lua VM for each autonomous agent and once the agent is created its Lua initialization affects FPS pretty badly. I'm thinking about the following schema: what about keeping "preforked" Lua state which is then simply cloned for each agent? Is it possible? 回答1: You want to consider using

问题 Here's what I'm trying to do (this code doesn't work): class Base { virtual Base *clone() { return new Base(this); } virtual void ID() { printf("BASE"); }; class Derived : publc Base { virtual Base *clone() { return new Derived(this); } virtual void ID() { printf("DERIVED"); } } . . Derived d; Base *bp = &d; Base *bp2 = bp->clone(); bp2->ID(); What I'd like is to see "DERIVED" printed out... what I get is "BASE". I'm a long-time C programmer, and fairly experienced with C++... but I'm not