oop

问题 I'm making an OOP chat client in Rust. The module messages.rs creates and handles messages to other modules as structs: SimpleMessage and ComplexMessage structs: //! # Messages use time::SteadyTime; /// Represents a simple text message pub struct SimpleMessage<'a> { pub user: ... pub time: &'a SteadyTime<'a>, pub content: &'a str, } /// Represents attachments, like text or multimedia files. pub struct ComplexMessage<'a> { pub user: ... pub time: &'a SteadyTime<'a>, //pub content: PENDING }

问题 Due to the fact that you can not use $this-> inside a static functio, how are you supposed to access regular functions inside a static? private function hey() { return 'hello'; } public final static function get() { return $this->hey(); } This throws an error, because you can't use $this-> inside a static. private function hey() { return 'hello'; } public final static function get() { return self::hey(); } This throws the following error: Non-static method Vote::get() should not be called

问题 I have following code where I'm getting error while compiling in C# visual Studio 2015. class Oval:Shape { private double major_axis, minor_axis; public Oval(double Major_Axis, double Minor_Axis) { major_axis = Major_Axis; minor_axis = Minor_Axis; } //Constructor } class Circle:Oval { private double radius; public Circle(double Circle_Radius) // Getting Error on this line { radius = Circle_Radius; } //constructor } 回答1: Fixing your bug: The error occurs due to the lack of a parameterless

问题 I have following code where I'm getting error while compiling in C# visual Studio 2015. class Oval:Shape { private double major_axis, minor_axis; public Oval(double Major_Axis, double Minor_Axis) { major_axis = Major_Axis; minor_axis = Minor_Axis; } //Constructor } class Circle:Oval { private double radius; public Circle(double Circle_Radius) // Getting Error on this line { radius = Circle_Radius; } //constructor } 回答1: Fixing your bug: The error occurs due to the lack of a parameterless

问题 I have following code where I'm getting error while compiling in C# visual Studio 2015. class Oval:Shape { private double major_axis, minor_axis; public Oval(double Major_Axis, double Minor_Axis) { major_axis = Major_Axis; minor_axis = Minor_Axis; } //Constructor } class Circle:Oval { private double radius; public Circle(double Circle_Radius) // Getting Error on this line { radius = Circle_Radius; } //constructor } 回答1: Fixing your bug: The error occurs due to the lack of a parameterless

问题 Consider the following code snippets: package vehicle; public abstract class AbstractVehicle { protected int speedFactor() { return 5; } } package car; import vehicle.AbstractVehicle; public class SedanCar extends AbstractVehicle { public static void main(String[] args) { SedanCar sedan = new SedanCar(); sedan .speedFactor(); AbstractVehicle vehicle = new SedanCar(); // vehicle //WON'T compile // .speedFactor(); } } SedanCar is a subclass of AbstractVehicle which contains a protected method

问题 Consider the following code snippets: package vehicle; public abstract class AbstractVehicle { protected int speedFactor() { return 5; } } package car; import vehicle.AbstractVehicle; public class SedanCar extends AbstractVehicle { public static void main(String[] args) { SedanCar sedan = new SedanCar(); sedan .speedFactor(); AbstractVehicle vehicle = new SedanCar(); // vehicle //WON'T compile // .speedFactor(); } } SedanCar is a subclass of AbstractVehicle which contains a protected method

问题 I want to subclass sklearn.svm.LinearSVC and use it as an estimator for sklearn.model_selection.GridSearchCV . I had some issues with subclassing earlier and I thought I fixed it based on my previous post and the selected answer. However, now my objective is to create an sklearn.kernel_approximation.RBFSampler object as an attribute of my new class. Now this is an example and I have a broader question here which is: Question: With the final expectation of using my new estimator class with

问题 I've been running into a weird little smell in my python code lately and I think it has something to do with parallel inheritance. Here is a small example I concocted: class DogHabits: def __init__(self): self.habits = ['lick butt'] class GermanShepherdHabits(DogHabits): def __init__(self): super().__init__() self.habits.extend(['herd sheep']) class LabradorHabits(DogHabits): def __init__(self): super().__init__() self.habits.extend(['hunt', 'pee on owner']) class Dog: def __init__(self):

问题 I am pretty new to Python and am tackling OOP. I am a bit confused as to when to use calls to methods and classes. The sample code below outputs the average, however I am curious as to when you would use calling from the Class vs methods from a real-world perspective. I'm pretty sure this is just something that I may have yet to tackle, but it's just been a bit of a confusion as to when I would use one over the other. class Student: def __init__(self, new_name, new_grades): self.name = new