static-methods

问题 I have a code like that: User = function(){} User.a = function(){ return "try"; } User.b = function(){ } ​ From User.b() I can call User.a() using: User.b = function(){ return User.a(); } but not using this since it's not an instance of user (User.a() and User.b() are something like "static methods"). What i want to do is to be able to call User.a() from User.b() without knowing which is the main function, in this case User. Something like this to be used in static methods. 回答1: In reality

问题 I have a code like that: User = function(){} User.a = function(){ return "try"; } User.b = function(){ } ​ From User.b() I can call User.a() using: User.b = function(){ return User.a(); } but not using this since it's not an instance of user (User.a() and User.b() are something like "static methods"). What i want to do is to be able to call User.a() from User.b() without knowing which is the main function, in this case User. Something like this to be used in static methods. 回答1: In reality

问题 I was pointed last week about a piece of code like this: #include <pthread.h> namespace NSTest { class SingletonClass { public: static SingletonClass & getInstance() { static pthread_mutex_t mutex; pthread_mutex_lock(&mutex); if(singletonPtr==nullptr) { createInstence(); } return (*singletonPtr); pthread_mutex_unlock(&mutex); } private: static void createInstence() { static SingletonClass static_SingletonClass; singletonPtr=&static_SingletonClass; } static SingletonClass * singletonPtr; };

问题 I was pointed last week about a piece of code like this: #include <pthread.h> namespace NSTest { class SingletonClass { public: static SingletonClass & getInstance() { static pthread_mutex_t mutex; pthread_mutex_lock(&mutex); if(singletonPtr==nullptr) { createInstence(); } return (*singletonPtr); pthread_mutex_unlock(&mutex); } private: static void createInstence() { static SingletonClass static_SingletonClass; singletonPtr=&static_SingletonClass; } static SingletonClass * singletonPtr; };

问题 I am trying to access a static member from a non-static function in the class, and I get an error saying Static member cannot be accessed off an instance variable this is how my code looks - class myClass { public static testStatic: number = 0; public increment(): void { this.testStatic++; } } From what I understand of static members/methods, we shouldn't access non-static members in static functions, but vice-versa should be possible. the static member is already created and is valid, so why

问题 Here's what I have. public static void Person_home_phone_TextChanged(object sender, EventArgs e) { ... } Is there any way to access non-static methods from the same or another class from inside this static method? I need grab the text in the Person_home_phone text box and save it to a class data member. 回答1: Example() -> Example You would just need to create an instance of the type then call the non-static , from a static method. public class Example(){ public static void StaticExample() {

问题 I have a class Person and a static method in that class called call_person : class Person: def call_person(): print "hello person" In the python console I import the class Person and call Person.call_person() . But it is giving me error that says 'module' object has no attribute 'call_person' . Can anyone please let me know why I am getting this error? 回答1: You need to do something like: class Person(object): #always inherit from object. It's just a good idea... @staticmethod def call_person(

问题 This question already has answers here : Accessing class variables from a list comprehension in the class definition (5 answers) Closed 16 days ago . Given the class from __future__ import annotations from typing import ClassVar, Dict, Final import abc class Cipher(abc.ABC): @abc.abstractmethod def encrypt(self, plaintext: str) -> str: pass @abc.abstractmethod def decrypt(self, ciphertext: str) -> str: pass class VigenereCipher(Cipher): @staticmethod def rotate(n: int) -> str: return string

问题 This question already has answers here : Accessing class variables from a list comprehension in the class definition (5 answers) Closed 16 days ago . Given the class from __future__ import annotations from typing import ClassVar, Dict, Final import abc class Cipher(abc.ABC): @abc.abstractmethod def encrypt(self, plaintext: str) -> str: pass @abc.abstractmethod def decrypt(self, ciphertext: str) -> str: pass class VigenereCipher(Cipher): @staticmethod def rotate(n: int) -> str: return string

问题 C# Question - I'm trying to determine whether it is OK to use a static method where, within the method it does have some local variables it uses. Are the local variables "shared" across usages of the method? What happens for example if the static method is being called/used at the same time from different threads? Does one thread block until the other is complete etc? Perhaps the generalised question is, in a threaded application, when should one "not" being using a static method? 回答1: Local