multiple-dispatch | 易学教程

multipledispatch ModuleNotFoundError running from command-line

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问题 Running a locust (locust.io) script from the command line. locust calls main.py which has the following imports: from locust import HttpUser, between, task from StreamLoader.stream_generator import * # thought this brings in everything Packer.py has these imports: from multipledispatch import dispatch from PackedItem import PackedItem StreamGenerator.py has: import hashlib from StreamLoader.Packer import Packer from aes_encryption import AesEncryption I used pip to install multipledispatch

Does java support multiple dispatch? If not how is the below code working?

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问题 Does java support multiple dispatch? If not how is the below code working? Account.java public interface Account { public void calculateInterest(); } SavingsAccount.java public class SavingsAccount implements Account { } LoanAccount.java public class LoanAccount implements Account { } InterestCalculation.java public class InterestCalculation { public void getInterestRate(Account objAccount) { System.out.println("Interest Rate Calculation for Accounts"); } public void getInterestRate

Does java support multiple dispatch? If not how is the below code working?

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How to provide a non-slurpy array or named array from the command line?

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问题 First of all: raku (perl6) is amazing. And so is Cro. It only took a week-end to fall in love. However now I stumble over something that must be extremely simple. If I use a slurpy parameter in a multiple dispatch MAIN this is recognized and works perfectly: multi MAIN( 'config', 'add', *@hostnames ) { However if I make this a non-slurpy array, this is either not recognized or I don't know how to provide it from the command line: multi MAIN( 'config', 'add', @hostnames ) { I would expect one

Multiple Dispatch with Generics

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问题 I'm trying to abstract away my interface implementations by providing a factory/builder using generics. However, I'm running into an issue with multiple dispatch and C# generics at run time that's doing something that seems odd. The basic scenario is I've defined several interfaces: public interface IAddressModel { } public interface IUserModel { } Then I have a factory class to return the actual implementations: public class Factory { public T BuildModel<T>() { return BuildModel(default(T));

Multiple dispatch in C++

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问题 I am trying to understand what multiple dispatch is. I read a lot of various texts but I still have no idea what multiple dispatch is and what it is good for. Maybe the thing I am missing is piece of code using multiple dispatch. Please, can you write a little piece of code in C++ using multiple dispatch so that I can see it cannot be compiled/runned properly because C++ has only single dispatch? I need to see the difference. Thanks. 回答1: Multi-dispatch is the ability to choose which version

Apples, oranges, and pointers to the most derived c++ class

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问题 Suppose I have a bunch of fruit: class Fruit { ... }; class Apple : public Fruit { ... }; class Orange: public Fruit { ... }; And some polymorphic functions that operate on said fruit: void Eat(Fruit* f, Pesticide* p) { ... } void Eat(Apple* f, Pesticide* p) { ingest(f,p); } void Eat(Orange* f, Pesticide* p) { peel(f,p); ingest(f,p); } OK, wait. Stop right there. Note at this point that any sane person would make Eat() a virtual member function of the Fruit classes. But that's not an option,

Generic dispatch with Symbols

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问题 I was wondering if there was a way to use Symbols for multiple dispatch, but also include a "catch-all method". i.e. something like function dispatchtest{alg<:Symbol}(T::Type{Val{alg}}) println("This is the generic dispatch. The algorithm is $alg") end function dispatchtest(T::Type{Val{:Euler}}) println("This is for the Euler algorithm!") end The second one works and matches what's in the manual, I'm just wondering how you get the first one to work. 回答1: You can do it this way: julia>

Work around Java's static method dispatching without Double Dispatch/Visitor patterns

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I am using a class Foo that provides these methods: String overloadedMethod(Object) String overloadedMethod(Goo) Since Java statically dispatches on the non-receiver argument, I cannot just pass my value (which is an Object , but might have dynamic type Goo ) and rely on the JVM to dynamically choose the "correct" method. This is my current (ugly) work-around: Object value = ...; Foo foo = new Foo(); if (value instanceof Goo) { Goo gooValue = (Goo) value; return foo.overloadedMethod(gooValue); // -> overloadedMethod(Goo) } else { return foo.overloadedMethod(value); // -> overloadedMethod

Optimizing multiple dispatch notification algorithm in C#?

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Sorry about the title, I couldn't think of a better way to describe the problem. Basically, I'm trying to implement a collision system in a game. I want to be able to register a "collision handler" that handles any collision of two objects (given in either order) that can be cast to particular types. So if Player : Ship : Entity and Laser : Particle : Entity , and handlers for (Ship, Particle) and (Laser, Entity) are registered than for a collision of (Laser, Player) , both handlers should be notified, with the arguments in the correct order, and a collision of (Laser, Laser) should notify