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Objective-c - Why are parent class initializers called different in swift initialization and object-c initialization?

In swift, we must confirm that the subclass has completed initialization before calling the parent class initializer, as follows: {Code...} But in Object-c, we must first confirm that the parent class has completed initialization before proceeding. Subclass initialization: {code...} Is this the reas...

習(xí)慣沉默 2017-05-02 09:26:32 0  0  866

Class initialization problem

Initialization of a class means that a class file of the class is generated, right?

P粉477414213 2022-11-19 12:50:45 0  0  872

How to get the constructor class name of the passed in object in PHP?

Suppose I have the following class structure: classLogger{publicfunction__construct(string$channel){//Logger initialization work}}classUsingLogger{privateLogger$logger;publicfunction__construct(Logger$logger){$this->logger=$logger;}}$logger =newLog

P粉413307845 2023-09-11 11:23:19 0  1  692

visual-studio - Regarding the temporary variable destruction problem generated during initialization of c++ object array?

The first case: When creating a C++ object array, if you assign values ??through the initialization list, temporary variables will be generated, but why the destructor will not be called. The code is as follows: {code...} The output result is: Among them, Point A[2] ={Point(1,2),Point()}; Initialize...

PHP中文網(wǎng) 2017-05-16 13:24:00 0  3  1176

PHP class variable assignment problem

As shown in the picture, I want to know why class variables cannot be assigned to object method variables, but they can be assigned in constructors.

phpcn_u1582 2017-05-16 13:03:21 0  4  484

Cannot read property of undefined error: Wrong class binding type for Vue bound object property

I'm trying to bind a class based on an object property, but when I click on the list object to trigger the @click, the console tells me that the object property of isSelected cannot be read... I'm trying to use a function on a dynamically rendered list item to Receives the id of the item and trigger...

P粉617237727 2023-08-26 23:55:21 0  1  801

PHP delete object properties

How to delete an attribute of an object in php?

高洛峰 2017-06-30 09:55:21 0  1  2161

In php, the class name::class, what does it mean?

I would like to ask: In the following PHP code, what does the class name::class mean? {code...}

曾經(jīng)蠟筆沒有小新 2017-06-30 09:54:29 0  2  1000

php - class not found?

I am trying NetEase Hive's object storage. According to the documentation, the folder structure on the vps is now like this: index.php is like this: {code...} When running, it prompts: Fatal error: Class 'NOS\ NosClient' not found in /data/wwwroot/default/ind...

PHP中文網(wǎng) 2017-05-16 13:12:17 0  3  816

Will calling a static method directly using the class name in PHP trigger the constructor of the class or parent class?

As the title says, PHP calls static methods directly using the class name. Two questions: 1. Will the constructor of the current class be called? 2 Will the constructor of the parent class of the current class be called?

淡淡煙草味 2017-07-07 10:34:10 0  3  1554

Does anyone know where Jingshui Brother Shui has a PHP class?

Who knows where Brother Shui in Jingshui has a PHP class? Who knows where Brother Shui in Jingshui has a PHP class?

A0五花牛 2020-10-10 00:54:44 0  1  1212

In Gao Qi's Java video code, why does the time print out using a new object created using the Date class, but the hash code address prints out using a self-created object?

Recently, when watching Teacher Gao's video, I found a knowledge point that I didn't quite understand. The code is as follows: {Code...} The output result is as follows: {Code...} It also prints an object. Why does the Date class object output the current time, but since What about creating an objec...

巴扎黑 2017-06-23 09:14:34 0  4  1087

PHP object-oriented cannot read mariadb

PHP is written in an object-oriented way, why can't the data be read in the select with where (>ω<). &nbs

仰望星空 2020-06-05 15:20:11 0  1  1192

PHP class attribute declaration?

<?php class Image{     private $path;     public function __construct($path = './'){      &nb

A _ Ｑ _ｉ_ 2021-10-17 22:05:54 0  7  1028

What is the access syntax for PHP object properties?

How to access properties of a PHP object? Also, what is the difference between using $this-&gt;$property1 and $this-&gt;property1 to access object properties? When I try to use $this-&gt;$property1 I get the following error: 'PHP: Cannot access null property'. There is a comment in PHP's...

P粉966335669 2023-08-22 19:45:26 0  2  755

Reworded title: Why doesn't PHP handle "class not found" errors?

In the example below, I want to catch the error and create a Null class if the class does not exist. But despite my try/catch statements, PHP just tells me that the 'SmartFormasdfasdf' class is not found. How to get PHP to catch "class not found" errors? <?phpclassSmartFormLoginextendsS...

P粉475126941 2024-01-03 19:53:41 0  2  634

javascript - JS inheritance, how to avoid the situation where the object type attribute of the parent class prototype will be affected by the subclass;

Parent is the parent class, and child inherits parent. When the sex value of the child instance is modified, it will cause the sex of the parent and other subclass instances to change; whether this type of object type attributes can only be placed in the constructor, or whether it is agreed upon All...

過去多啦不再A夢(mèng) 2017-06-30 09:59:00 0  4  997

When inserting data encapsulated by the PHP class, the insertion is always unsuccessful and false is returned;

<?php //Database operation class class Model{ Private $host; //Database address Private $user; //Database username Private $pwd; /

A _ Ｑ _ｉ_ 2021-10-13 10:21:27 0  6  1132

jvm - Are Java new objects atomic?

{Code...} I would like to ask, there is complex object initialization logic in the xxx() method. Is the object created by the new keyword atomic? If not, will there be a problem of object initialization disorder?

滿天的星座 2017-06-23 09:14:17 0  4  1407

class - How does PHP implement that all subclass attributes have toArray() method?

How to implement in PHP that all properties of subclasses have toArray() method? After the call, it becomes an array. How to design the parent class? ?

阿神 2017-05-16 12:59:22 0  3  662