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Questions - liskov-substitution-principle

Liskov, optional and derivied classes

I have a hierarchy of classes that starts with: class Filter(ABC): pass ... class SomeFilter(DerivedFromFilter): pass Then I have a hierarchy of classes with a method with a parameter that ...
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Dirich

python

liskov-substitution-principle

Votes: 0

Answers: 0

How can I make this small pseudocode comply with Liskov principle?

Keeping things tidy and simple, here is my initial Java pseudocode as an example: public abstract class Vehicle { private String owner; private id plate; public removeVehicle()...
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BadProgrammer

java

solid-principles

liskov-substitution-principle

open-closed-principle

Votes: 0

Answers: 1

Latest Answer

According to "Functions that use pointers or references to base classes must be able to use objects of derived classes without knowing it." see https://en.wikipedia.org/wiki/SOLID The targ...
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jonas

Python liskov substition principle and custom init

I am writing classes with custom init functions that provide async initialization. This all works well, except that when I create a subclass and override the async init function, mypy tells me I am vi...
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Aart Stuurman

python

mypy

python-typing

liskov-substitution-principle

Votes: 0

Answers: 2

Latest Answer

The initialization from a class is generally not covered by LSP, which is concerned with the substitution of instances. As per the definition of LSP: (emphasis mine) Subtype Requirement: Let ϕ(x) be ...
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MisterMiyagi

Violation of the LSP-principle using extra constructor parameters in subtypes

I've been reading about the Liskov Substitution Principle when I noticed this answer. It has a Circle and a ColoredCircle type where the constructor of ColoredCircle takes one extra argument; the colo...
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Bas

python

oop

design-patterns

solid-principles

liskov-substitution-principle

Votes: 0

Answers: 3

Latest Answer

When a class X has a constructor, the constructor is not a method on objects of type X. Since it is not a method on objects of type X, it doesn't have to exist as a method on objects of derived types...
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Matt Timmermans

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