Recent questions tagged polymorphism

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polymorphism - Best Practice For List of Polymorphic Objects in C++

What is a common practice for the storage of a list of base class pointers each of which can describe a ... solutions out there! Thank you See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - How to comfortably deal with the type system on Haskell?

Haskell's type system is powerful and liked for its mathematical rigorousness and logical soundness, on the other ... x6 is unsatisfied here. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Rails 4 Polymorphic associations and concerns

I'm trying to add an Evaluation model to my Rails 4 app. I have made a model called evaluation.rb. ... person who should receive the evaluation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Can I mimic multiple passed-object dummy arguments in Fortran?

I would like to write a procedure which takes two passed-object dummy arguments, such as module m type, abstract ... (Child) from class(Parent)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Overriding vals in Scala

I have tried to override val in Scala as this: trait T{ val str: String } sealed abstract class Test extends ... pass it as a class parameter. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Make OCaml function polymorphic for int lists and float lists

Is there a way to create a polymorphic add function in OCaml that works equally well for ints and floats? So for ... one. Thanks for the help? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Can't use virtual and override on the same method in C#

So apparently you cannot use the virtual modifier with the override modifier. virtual - a method that can be ... of virtual and override? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Calling method from java child class not in parent class

Consider the following base/derived classes: public class Car { private int cylinders; public Car(int cyl) { ... uses the over-ridden method? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - What does 'has virtual method ... but non-virtual destructor' warning mean during C++ compilation?

#include <iostream> using namespace std; class CPolygon { protected: int width, height; public: virtual int area () { ... } ~CRectangle(){} }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Existential vs. Universally quantified types in Haskell

What exactly is the difference between these? I think I understand how existential types work, they are like ... are universal types different? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Metamorphic Code Examples

I understand the concept of Polymorphic and Metamorphic code but I recently read the Wikipedia page on both (for ... to make metamorphic code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - “overriding” private methods with upcasting call in java

public class PrivateOverride { private void f() { System.out.println("PrivateOverride f()"); } public static void main ... , It confuse me now ! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Inheritance in curiously recurring template pattern polymorphic copy (C++)

I'm using CRTP to add a clone method to inherited classes, for example: class Base { virtual ~Base() {}; ... to fix this? Thanks for reading! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - C++: Why does a structclass need a virtual method in order to be polymorphic?

Following this question, I'm wondering why a structclass in C++ has to have a virtual method in order to ... to have a virtual method? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - polymorphic C++ references

I was wondering how you can do polymorphism with references, as opposed to pointers. To clarify, see the ... come up with this solution. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Why is OCaml's (+) not polymorphic?

I am an OCaml newbie. I like OCaml's speed but I don't fully understand its design. For example, I would like the ... so on. Why do we need +.? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Is there any reason that Java uses late/static binding for overloaded methods in the same class?

Is there any specific reason why Java uses early binding for overloaded methods? Wouldn't it be possible to ... rather expect: INTEGER OBJECT See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - When to mark a function in C++ as a virtual?

Because of C++ nature of static-binding for methods, this affects the polymorphic calls. From Wikipedia: Although ... code to run as expected? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - C++: How to implement polymorphic object creator to populate a table

I have a table widget object that can be resized with set_num_col(int) and set_num_row(int). A call to each ... widget in a better way? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - SWIG Java Retaining Class information of the objects bouncing from C++

Ok, there's a keyword that I've intentionally kept away from the tags and the title. That's "Android", but ... keep it under control for now. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Does Haskell have return type overloading?

Based on what I've read about Haskell, and the experimentation I've done with GHC, it seems like ... Haskell had return type overloading See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Must ASP.NET MVC Controller Methods Return ActionResult?

Being new to ASP.NET MVC, I've been wondering about the signature of Controller methods. In all the ... methods with specific return types? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - When is a vtable created in C++?

When exactly does the compiler create a virtual function table? 1) when the class contains at least one virtual ... C get dynamic polymorphism? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - Haskell: How to create most generic function possible that applies a function to tuple items

This is a personal exercise to understand the limits of Haskell's type system a little better. I want to ... a more specific type signature. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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polymorphism - C++ abstract class without pure virtual functions?

I have a base class class ShapeF { public: ShapeF(); virtual ~ShapeF(); inline void SetPosition(const ... without the pure virtual functions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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