c# - "A class can directly inherit multiple interfaces, but can only directly inherit one class (including abstract classes)." Isn't it inconsistent with C++'s multiple inheritance?

"A class can directly inherit multiple interfaces, but can only directly inherit one class (including abstract classes)." Isn't it inconsistent with multiple inheritance in C++?

ringa_lee 2017-05-31 10:36:49 0  2  2279

The built-in reference type of C# video tutorial cannot be viewed

The built-in reference type of C# video tutorial cannot be viewed

柏里晗 2018-05-13 21:29:44 0  0  1176

Problem assigning base class pointer to derived class

Assign the derived class address to the base class pointer, that is, the base class pointer refers to the derived class object, which is what we usually call polymorphism. But when it is the other way around, it must be forced type conversion before it can be compiled. Here is the direct code: {code...

曾经蜡笔没有小新 2017-06-05 11:11:46 0  3  1205

iOS: Null pointer reference when encoding non-null enum type?

The structure is roughly like this. Class A contains an array of class B. Class B contains a variable of enumeration type C. When A is initially initialized, 10 B elements are initialized as shown in the figure. Except In addition, the B array in class A has not been modified. However, when encoding...

淡淡烟草味 2017-05-31 10:36:30 0  1  901

About the destructor of C++ class template

1. I just learned C++ in my freshman year and encountered some problems. If there is something wrong, I hope you can give me some advice. 2. When instantiating a member function of a class template, why is the destructor automatically called after the function ends? For example {code...} {code...} I...

漂亮男人 2017-05-16 13:25:14 0  1  704

Extend PHP classes used internally without changing dependencies

I want to override a PHP class in Laravel, but it is being extended by several other classes that I don't want to bother with. The overall structure is as follows classAextendsR{}classBextendsR{}classCextendsR{}classDextendsR{}where A/B/C/D/R are all classes in the external package. I want to extend...

P粉278379495 2024-01-10 17:24:16 0  1  390

Problems with unsigned types and signed types in C++

Question 1: "When we assign a value to an unsigned type that exceeds its representation range, the result is the remainder of the initial value modulo the total number of values ​​represented by the unsigned type." How do you understand this sentence? For example, why is the result of assi...

给我你的怀抱 2017-06-19 09:07:29 0  1  1521

Facade is similar to class inheritance, right?

Facade is similar to class inheritance, right?

︿ 2019-03-02 17:04:13 0  3  1263

Serious problem: Unable to find 'PHPMailer' class

I tried: include_once('C:\Inetpub\wwwroot\php\PHPMailer\PHPMailerAutoload.php'); Fatal error: 'PHPMailer' not found on line 151 of C:\Inetpub\wwwroot\php\index.php Class I put PHPMailerAutoload.php in the same directory as my script. Can anyone help me solve this problem?

P粉738346380 2023-08-20 20:15:59 0  1  554

javascript - Add a pseudo-class to a certain class. This class has a click event. Now when I click on the pseudo-class, the click event is also triggered.

Add a pseudo-class to a certain class. This class has a click event. Now when I click on the pseudo-class, the click event is also triggered. How can I prevent the click event from being triggered by clicking on the pseudo-class?

欧阳克 2017-07-05 10:44:13 0  2  1053

javascript - Category editor retains previous category name

Now there is such a demand. Due to the unreasonable design of the previous classification, it is now necessary to edit the classification and the previous classification name (called the old classification name) is not in the editing classification drop-down list. However, when querying, the old cla...

黄舟 2017-06-30 09:52:43 0  2  1073

Convert base class instance to derived class without typecasting in typescript

I extended a new class from the base class and added some properties. How to create an instance of a derived class using a given base class (including attached properties)? This code works but casts the class type and is not type safe. How can I do this without type casting? //Baseclassisimportedfro...

P粉451614834 2024-02-25 19:48:09 0  2  432

Why can't void and {} be inferred as never type in TypeScript?

I get different results when I use TypeScript's void type with cross typing with other types. typeA=void&{}//A is void&{}typeB=void&'1'//B is nevertypeC=void&1//C is nevertypeD=void&string//D is nevertypeE=void&String//E is void&Stringt

P粉548512637 2023-09-04 16:03:52 0  1  656

Mini Games - C++ Beginner, Graphics Library

I have taught myself C and C++, but I feel that I am not very familiar with the class mechanism in C++, and I have no engineering concepts. I'm thinking about writing a small game by myself (similar to controlling a plane to fly on a two-dimensional plane, attacking enemy planes, etc.) but I don't k...

黄舟 2017-05-16 13:22:12 0  2  675

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?

淡淡烟草味 2017-07-07 10:34:10 0  3  1443

c++ - Can functions with the same name with different parameters in a derived class be declared as virtual functions

When the base class and the derived class have functions with the same name, regardless of whether the number of parameters is the same or different, the subclass object will always directly call the function of the same name of the derived class. If you want to call the function of the same name of...

世界只因有你 2017-06-10 09:48:57 0  1  1315

java - mysql blob type reading problem!

The type saved in the database is a blob type, written in C++. I don’t know if it is any different from Java storage. The problem now is that it has a structure when it is saved: the structure is: first two integers, representing 101 and 101 respectively. The number of variables, followed by an inte...

淡淡烟草味 2017-06-24 09:41:30 0  1  1103

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...

过去多啦不再A梦 2017-06-30 09:59:00 0  4  906

Is there a class tree?

Is there a class tree?

二哥 2021-02-21 19:08:28 0  1  1220

Delete multi-level classification problems

The content taught by the teacher can only delete the category and subcategories, but the subcategories of the subcategories cannot be deleted.

Tranquil Eternal 2019-07-18 21:49:22 0  1  1127