cloning

I have next situation: Connection manager should have each time one object of ConnectionServer and new objects of DataBean So, I have created these beans and configured out it spring xml. <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework

One core concept in Redux is, states are immutable . However, I saw many examples, including in Redux docs using javascript Object.assign . Then, I saw this warning in MDN : For deep cloning, we need to use other alternatives because Object.assign() copies property values. If the source value is a reference to an object, it only copies that reference value. So, why using Object.assign if the whole point is immutability? Am I missing something here? Let's look at the example you linked: function todoApp(state = initialState, action) { switch (action.type) { case SET_VISIBILITY_FILTER: return

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()) | ^^^^^^^^^^^^ expected struct `Vector`, found reference | = note: expected type `Vector<T, N>` found type `&Vector<T, N>

In the past I had the need to clone objects, only to find that they don't implement a Clone() method, forcing me to do it by hand (create a new instance and copy all properties from the original to the new one) Why isn't cloning as easy as duplicating the memory block the object is allocated in, and thus have the Clone method in the object class, having all classes in .NET inherit it? Because that wouldn't perform a deep clone, which is usually what clones really need to be. Imagine you have a reference to an array, or a list... simply copying the memory taken by your object will simply clone

I wonder what is the fastest way to do shallow copying in C#? I only know there are 2 ways to do shallow copy: MemberwiseClone Copy each field one by one (manual) I found that (2) is faster than (1). I'm wondering if there's another way to do shallow copying? Nick Stamas This is a complex subject with lots of possible solutions and many pros and cons to each. There is a wonderful article here that outlines several different ways of making a copy in C#. To summarize: Clone Manually Tedious, but high level of control. Clone with MemberwiseClone Only creates a shallow copy, i.e. for reference

This question already has an answer here: How do I do a deep copy of a 2d array in Java? 6 answers Edit 2: Below is a code snippet based on DuffyMo's response that illustrates how to get around the limitations of cloning for multidimensional arrays using System.arraycopy. import java.util.Arrays; public class Randar { public static int[][] arrayMaster = {{6,1}, {10,1}, {1,1}}; private static int[][] arrayChanges = new int[arrayMaster.length][2]; public Randar () { } public static void main(String[] args) { arrayChanges[0][0] = 0; resetArrays(arrayChanges, arrayMaster); arrayChanges[0][0] = 0;