implementation

问题 my solution get the rightmost n bits of y a = ~(~0 << n) & y clean the n bits of x beginning from p c = ( ~0 << p | ~(~0 << (p-n+1))) & x set the cleaned n bits to the n rightmost bits of y c | (a << (p-n+1)) it is rather long statements. do we have a better one? i.e x = 0 1 1 1 0 1 1 0 1 1 1 0 p = 4 y = 0 1 0 1 1 0 1 0 1 0 n = 3 the 3 rightmost bits of y is 0 1 0 it will replace x from bits 4 to bits 2 which is 1 1 1 回答1: I wrote similar one: unsigned setbits (unsigned x, int p, int n,

问题 I've been agaonizing about this problem for some days: I have a class Info public class Info { private int _no; public int No { get { return _no; } set { _no = value; } } } That class can be used anywhere in any classes (inherited or as property). The property can be considered as security relevant or not. That information is known at design time and needs to be stored for that particular property. So for some classes which uses that class as property I want the member "No" to be set

问题 In Clojure, some tasks (such as instantiating a PersistentQueue or using deftype to implement a custom data type that is compatible with the clojure.core functions) require knowledge of the classes and/or interfaces in clojure.lang. However, according to clojure.lang/package.html: The only class considered part of the public API is clojure.lang.IFn. All other classes should be considered implementation details. Are these statements incorrect or outdated? If so, are there plans to correct them

问题 Consider the following three interfaces: interface IBaseInterface { event EventHandler SomeEvent; } interface IInterface1 : IBaseInterface { ... } interface IInterface2 : IBaseInterface { ... } Now consider the following class that implements both IInterface1 and IInterface 2: class Foo : IInterface1, IInterface2 { event EventHandler IInterface1.SomeEvent { add { ... } remove { ... } } event EventHandler IInterface2.SomeEvent { add { ... } remove { ... } } } This results in an error because

问题 I have a problem implementing minhashing. On paper and from reading I understand the concept, but my problem is the permutation "trick". Instead of permuting the matrix of sets and values the suggestion for implementation is: "pick k (e.g. 100) independent hash functions" and then the algorithm says: for each row r for each column c if c has 1 in row r for each hash function h_i do if h_i(r) is a smaller value than M (i, c) then M(i, c) := h_i(r) In different small examples and teaching book

问题 I've been trying to implement this algorithm in Python for a few days now. I keep coming back to it and just giving up and getting frustrated. I don't know whats going on. I don't have anyone to ask or anywhere to go for help so I've come here. PDF Warning: http://www.cs.uiuc.edu/class/sp08/cs473/Lectures/lec10.pdf I don't think its a clearly explained, I sure don't understand. My understanding of what's happening is this: We have a set of of points (x1,y1), (x2,y2).. and we want to find some

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I have a bunch of large XML files (total size of all files is more than 1 GB) and I need to transform them from a vendor schema to our schema. The vendor has one ZIP file (it contains large XML files) at some FTP location on its server. I have to pick that ZIP file up and then transform all available XML files.

问题 How can I create a custom array constructor, which is an extended version of the native Array constructor? jQuery, for example, looks like an array with additional methods, such as $().addClass . However, it didn't modify Array.prototype , because new Array().hasClass is undefined . So, how can I create an extended array implementation, without modifying Array.prototype ? Example: Employees( ... ) //-> [{name: 'John', age: 32}, {name: 'Bob', age: 29}]; Employees( ... ).byAge(32)//-> [{name:

问题 I have an Interface and two Classes wich are implementing the Interface. public interface MyInterface { public void firstMethod(); public int secondMethod(); } public class MyClass1 implements MyInterface { public void firstMethod() {} } public class MyClass2 implements MyInterface { public void firstMethod() {} public int secondMethod() {} } The class MyClass1 is telling me to Add unimplemented methods , because the secondMethod is not implemented, OK I will do that. But the problem is that

问题 This question regards the implementation of ThreadLocalRandom in OpenJDK version 1.8.0. ThreadLocalRandom provides a per-thread random number generator without the synchronization overhead imposed by Random. The most obvious implementation (IMO) would be something like this, which appears to preserve backward compatibility without much complexity: public class ThreadLocalRandom extends Random { private static final ThreadLocal<ThreadLocalRandom> tl = ThreadLocal.withInitial(ThreadLocalRandom: