Category "constructor"

Can a constructor affect other fields of an enclosing object, or is this a static analysis false positive?

Consider this C++ code: struct SomeStruct { SomeStruct() noexcept; }; //SomeStruct::SomeStruct() noexcept {} class SomeClass { const bool b; const SomeS

Why does a class have a "constructor" field in JavaScript?

A class is supposed to have a prototype field that supplies default fields. For example, prototype.constructor defaults to the constructor function (i.e., the c

Transaction mined but execution failed

I was trying to deploy my smart contract to BSC testnet using Remix IDE, although it compiles successfully but when I try to deploy it I get this error message.

Brace Initialize struct with virtual functions

Brace initialization struct A { int a; int b; void foo(){} }; A a{1, 2}; It works fine. Bu

Explicitly calling base class constructor in derived class

May I ask if we are allowed to explicitly call base class constructor in derived class? (if not, why?) I'm asking this question because I wrote the following to

Factory - A value of type 'B' can't be returned from the constructor 'A.factoryConstructor' because it has a return type of 'A<T>'

I have this simplified code: enum Types { b, c, } class A<T> { A(); factory A.factoryConstructor(Types type) { switch(type) { case Typ

Uncaught TypeError: web3 is not a constructor. the blockchain website cannot connect to metamask

i have issue on web3.eth.defaultAccount = web3.eth.getAccounts(); below is the code. it said Uncaught (in promise) TypeError: Cannot read properties of undefine

How to modify the parameter pass to kotlin data class?

Say I have a data class data class MyClass(val crop: Rect, val name: String) But I want to make a copy of the Rect passed in since I don't want the value to be

(declared implicitly) cannot be referenced -- it is a deleted function

With the following code, I'm facing an issue. ABC.h namespace abcd { class ABC { public: ABC() = delete; ABC(const std::string&am

ASP.NET Core api controller not being instantiated

I've created an API controller in my .NET Core 3.1 application (with an Angular frontend, C#). For some strange reason its not being instantiated, if I try to c

how to use if statement in main to Create an object with user input and to use a method on the objects

I'm working on an exercise, where I need to create a subclass that has 2 constructors (1 is empty and sets the values as 0 the other one is getting the values.

How to pass a function through the constructor of a class?

I would like to pass a function through the constructor of a class. but when i call it, nothing happening. debug write: func : {_Closure} import 'package:flutt

Passing constructor as a parameter to a method

I am new to java and started working on constructors. I am seeing few examples where constructor is passed as parameter to a Method. Please tell me what happens

error: type ‘class’ is not a direct base of ‘class’

I haven't been able to find an answer that relates specifically to my question. It's a bit of a "strange" case in terms of what I've seen. So I have a class C

What is the best practice to construct a Domain Object depending on external calls?

I am trying to build an object that gets its data from external APIs. I will try to explain it with an example: First of all, I get a POST body in my API to cre

Should I initialise an Angular service in its constructor or in the ngOnInit method of the app.component?

I'm new to Angular. I have a service that needs to subscribe to a subject provided by another service. If this was a component, I would create the subscription

"ReferenceError: Must call super..." when passing raw JSX arg to super in derived class

Trying to run the following in a React app gives the ReferenceError (below). Why? I'm calling super(). Is the JSX somehow "accessing 'this'"? class Base { con

how to run multiple defs () - Python MAYA?

I am following a Python for Maya tutorial from: https://github.com/gyassa4/MayaPyth/blob/master/gear_builder.py After I run the code it only run first def() whi

Is there still a need to provide default constructors to use STL containers?

I remember that back in C++98, if you wanted to make an STL container of MyClass, you needed to provide default constructor to MyClass. Was this specific to som

Error: Try adding an initializer expression, or add a field initializer in this constructor, or mark it 'late'

void main() { Car c1 = new Car('E1001'); } class Car { String engine; Car(String engine) { this.engine = engine; print("The engine is : ${engine}