Questions tagged [class-design]
General guidelines on how to design classes with best known industry practices.
457 questions
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How to reduce the number of class instances passed to the __init__() method of a Python class?
I have a Python class called FunctionsManager; its __init__() method is the following:
class FunctionsManager:
def __init__(self, instance_class1, instance_class2, ..., instance_classN):
...
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3
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298
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Does (possibly) failable destructor require to change invariant violation error handling?
First, I'd like to highlight my personal premise on error handling approaches in C++ (as it might be the source of confusion in the first place). C++ Standards, 2004 (Sutter, Aleksandrescu), item 68 ...
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194
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How should User behaviour depending on role be design as OOP
Imagine I got user which might be either author, administrator, reviewer
An author have relation on book that he wrote.
An administrator have relation on banned user (we track which administrator ...
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270
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Should I let objects, whose copying is "costly", be naively copyable?
I'm devising an API - or actually, a wrapper API for another, lower-level API - in a programming language with objects.
This API represents some entity E which is reference-counted (for example - a ...
- 2,808
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Fix cyclic dependency between protocol and business classes
I'm designing a library for CANopen protocol. The basic CANopen frames are PDO and SDO, where PDO is like UDP (fire and forget) and SDO is like HTTP (request and response). A CANopen device is a PDO ...
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Calendar modeling in class diagram
I am creating a cinema website focused on client services, where clients can reserve tickets for movies and browse the cinema's schedule (both daily and weekly). The schedules will be managed by an ...
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Is a callback function with `this` as an argument a bad practice?
I have a class that has a callback function that gets triggered on some event. The user of the class instance is expected to do stuff on the instance itself, inside this callback function. So I am ...
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Object-oriented programming design with relational database tables
I want to understand what is considered best-practice to better align with OOP when handling relational databases. I cannot find any online examples where classes and a more maintainable/re-usable ...
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533
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Defining functions inside vs outside a class
Say I have a class with a function do_thing that is comprised of multiple steps, which themselves segregate into functions (first_process and second_process). At what point would this be considered ...
- 177
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169
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DAL class structure for storing and organizing SQL using Dapper?
I'm creating a web application with Asp.Net Core MVC, and I've replaced Entity Framework with a custom data store. I've decided to use Dapper, but have never used it prior to this project. So I'm ...
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158
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API design question: Should a builder perform expensive validation when building?
I'm working on a library of C++ wrappers/bindings, for another, C-ish, API.
The C'ish API has a "launch" function, which, among other things, takes a launch configuration structure (well, ...
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Possible violation of LSP when adhering to ISP?
Recently I read about ISP and wanted to implement it into my project. While implementing my design I think I found a flaw which violates LSP but I'm not sure.
Given I have a game project, in which ...
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Is there a proper term for a "closed class hierarchy?"
What I mean by "closed class hierarchy" is a set of known base/derived classes used only for an implementation of something with no public API, i.e., the classes are not meant to be derived ...
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Functional interfaces or decorator-like implementations [closed]
Consider Chess as an example. Say, we have a lot of domain objects that are alike, in this case chess pieces. I have two proposes to implementing the behaviour of chess pieces. Both uses the following ...
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Splitting up large SQLAlchemy model
Anybody have advice on splitting up a large SQLAlchemy model into smaller parts? I have a ~2000 line model called Article that is becoming difficult to manage. We often have to scroll and scroll to ...
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