In C# you can put a constraint on a generic method like: public class A { public static void Method<T> (T a) where T : new() { //…do something… } } Where you specify that T should have a constructor that requires no parameters. I’m wondering whether there is a way to add a constraint … Read more
Does the default constructor (created by the compiler) initialize built-in-types? 7 Answers 7
Imagine a base class with many constructors and a virtual method public class Foo { … public Foo() {…} public Foo(int i) {…} … public virtual void SomethingElse() {…} … } and now i want to create a descendant class that overrides the virtual method: public class Bar : Foo { public override void SomethingElse() … Read more
What are the differences between the two and when would you use an “object initializer” over a “constructor” and vice-versa? I’m working with C#, if that matters. Also, is the object initializer method specific to C# or .NET? 7 Answers 7
This question already has answers here: When to throw an exception? (32 answers) Closed 3 years ago. Is it a good practice to make the constructor throw an exception? For example I have a class Person and I have age as its only attribute. Now I provide the class as class Person{ int age; Person(int … Read more
This question already has answers here: When to throw an exception? (32 answers) Closed 3 years ago. Is it a good practice to make the constructor throw an exception? For example I have a class Person and I have age as its only attribute. Now I provide the class as class Person{ int age; Person(int … Read more
I split up my class constructor by letting it call multiple functions, like this: class Wizard: def __init__(self, argv): self.parse_arguments(argv) self.wave_wand() # declaration omitted def parse_arguments(self, argv): if self.has_correct_argument_count(argv): self.name = argv[0] self.magic_ability = argv[1] else: raise InvalidArgumentsException() # declaration omitted # … irrelevant functions omitted While my interpreter happily runs my code, Pylint has … Read more
I was wondering why in java constructors are not inherited? You know when you have a class like this: public class Super { public Super(ServiceA serviceA, ServiceB serviceB, ServiceC serviceC){ this.serviceA = serviceA; //etc } } Later when you inherit from Super, java will complain that there is no default constructor defined. The solution is … Read more
I am having some trouble working out how defining constructors in interfaces work. I might be totally misunderstanding something. But I have searched for answers for a good while and I can not find anything related to this. How do I implement the following interface in a TypeScript class: interface MyInterface { new ( … … Read more
I have been noticing __construct a lot with classes. I did a little reading and surfing the web, but I couldn’t find an explanation I could understand. I am just beginning with OOP. I was wondering if someone could give me a general idea of what it is, and then a simple example of how … Read more
