Yes, you can. The pointer to the class member variable is stored on the stack with the rest of the struct’s values, and the class instance’s data is stored on the heap. Structs can also contain class definitions as members (inner classes). Here’s some really useless code that at least compiles and runs to show … Read more
Making a class static just prevents people from trying to make an instance of it. If all your class has are static members it is a good practice to make the class itself static.
Since Java 12 Class provides a method arrayType(), which returns the array type class whose component type is described by the given Class. Please be aware that the individual JDK may still create an instance of that Class³. Class<?> stringArrayClass = FooBar.arrayType() Before Java 12 If you don’t want to create an instance, you could … Read more
For a private member, I only make it a property when getting and/or setting the value should cause something else to occur, like: private int Limit { get { EnsureValue(); return this._limit; } } Otherwise, fields are fine. If you need to increase their accessibility, it’s already a big enough change that making it a … Read more
Generics, oddly enough, use extends for interfaces as well.1 You’ll want to use: public class Foo<T extends SomeInterface>{ //use T as you wish } This is actually a requirement for the implementation, not a true/false check. For a true/false check, use unbounded generics(class Foo<T>{) and make sure you obtain a Class<T> so you have a … Read more
if(type instanceof Class && ((Class<?>)type).isEnum())
Overhead is not an issue, namespaces have some advantages though You can reopen a namespace in another header, grouping things more logically while keeping compile dependencies low You can use namespace aliasing to your advantage (debug/release, platform specific helpers, ….) e.g. I’ve done stuff like namespace LittleEndianHelper { void Function(); } namespace BigEndianHelper { void … Read more
Here’s an example of why it doesn’t make sense to be able to override the visibility: interface someI { void doYourWork(); } public class A : someI { public void doYourWork() { //… } } public class B : someI { private void doYourWork() { //… } } void Main() { List<someI> workers = getWorkers(); … Read more
Just assign to an instance: static from(json){ return Object.assign(new Student(), json); } So you can do: const student = Student.from({ name: “whatever” }); Or make it an instance method and leave away the assignemnt: applyData(json) { Object.assign(this, json); } So you can: const student = new Student; student.applyData({ name: “whatever” }); It could also be … Read more
This can be done by using an APIRouter‘s add_api_route method: from fastapi import FastAPI, APIRouter class Hello: def __init__(self, name: str): self.name = name self.router = APIRouter() self.router.add_api_route(“/hello”, self.hello, methods=[“GET”]) def hello(self): return {“Hello”: self.name} app = FastAPI() hello = Hello(“World”) app.include_router(hello.router) Example: $ curl 127.0.0.1:5000/hello {“Hello”:”World”} add_api_route‘s second argument (endpoint) has type Callable[…, Any], … Read more