Questions tagged [generics]

Generic programming is a style of computer programming in which algorithms are written in terms of to-be-specified-later types that are then instantiated when needed for specific types provided as parameters.

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5
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1answer
832 views

Processor for handling generic commands

I'm trying to implement business logic layer based on concepts of commands and command handlers. A command is a thing that contains input parameters for executing some action, and it knows what kind ...
2
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1answer
18 views

Use a delegate to assess equality

I have built my own generic class to implement IEqualityComparer(Of T), which takes a delegate as an input for the constructor. This delegate takes two objects of ...
2
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1answer
29 views

Angular Rest API generic service and implementation service

I'm wondering if there's a better way to write the ApiService and the CategoryService so that CategoryService is basically just a call to extend ApiService with the string 'category' and the base type ...
4
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2answers
52 views

Generic wrapper for single value or array of values

I'm writing a chart.js port for c# blazor (you can find it here) using C# 8.0 with .NET Core 3 (latest preview). In chart.js there is this thing called indexable options. It let's you use either a ...
5
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2answers
228 views

Generic Extension Method To Count Descendants

I've created a extension method to count every available descendant starting from a single, given key. The data is a flat list, there's is no hierarchical structure. (Well, not entirely true. There ...
9
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2answers
237 views

Immutable builder and updater

There aren't enough questions about creating immutable objects... so why not try it again with another approach. This time, it's a builder that maps properties to constructor parameters. Properties ...
2
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1answer
47 views

A Simplistic Finite State Machine Generator

I have designed a compile time Finite State Machine generator. I have chosen to use some of the features of C++17 such as parameter pack expansion, fold expressions and lambdas to keep the complexity ...
29
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0answers
882 views

Making a generic NSMapTable replacement written in Swift thread-safe

This is a follow-up to this question. While discussing some details about the code I posted there, I came upon a problem with thread-safety. After searching and trying different things, I reached a ...
6
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1answer
76 views

Distinguish between different types of log items in a dictionary by their key

My logging adapter is using a dictionary for storing data that is passed from middleware to middleware. It is a one-liner: ...
4
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1answer
103 views

Making Dependency Property registration strongly typed v2

This is my second attempt to create a strongly typed builder for the Dependency Property. I've improved the two main weaknesses of the previous version which were: Can specify only ...
2
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1answer
57 views

Implementation of Generic Binary Tree Code

I'm in the process of independently learning Generics as a way to build on a college assignment for Binary Search Tree. I've completed this program without Generics first and now I've converted over ...
2
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1answer
120 views

Performance issue with empty lists

Here's my updated version of the problem I posted at Calculating time windows for entities, adding in suggested changes as well as a change I did so that the Reflection is 'cached' in a ...
4
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0answers
70 views

Generic Macro Generated Interval Heap in C

When I saw this amazing data structure I couldn't stop myself from trying it! I first sought resources such as this and an article about it here. It basically works as a Max-Heap and a Min-Heap at the ...
3
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1answer
147 views

AVL height-balanced binary search Tree and Dictionary in C# v2

Mostly as a learning exercise, and partly as I thought it might be useful, I have written an implementation of AVL trees ( https://en.wikipedia.org/wiki/AVL_tree ). An AVL tree is a height-...
4
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2answers
126 views

Creating custom objects with custom properties using generics

I have two base classes: City and Building: ...
2
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2answers
103 views

Using T type parameter to clone a collection

I want to clone a collection with the following method and I want to know if it can be optimized: ...
4
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2answers
242 views

Genericizing PropertyValues

This should be the last iteration for this code. Does this approach make sense or am I heading down the wrong path? The only thing I can see to make this better is to genericize the ...
3
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0answers
159 views

Object pooling in WPF

In a WPF project I'm working on, often multiple objects reuse the same AnimationTimeline, to smooth that out I made an ...
2
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0answers
33 views

Range validator for multiple types

I have an existing overloaded set of functions that I cannot change and need to be tested: ...
9
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2answers
125 views

Generic data structures in C

I'm new to C, and I thought a great way to learn would be to implement some generic data structures and algorithms. So far I've implemented a linked list and a dynamic array. Both are generic, the ...
6
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3answers
334 views

Calculating time windows for entities

I have made some code that operates on multiple entities and creates 'time windows' for them. Basically, the entities will contain states, usually in boolean or int. They will be timestamped and in ...
6
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1answer
151 views

Enumerate all members and types with specific attributes

I have a use-case where I need to retrieve all members with specific attributes in the class and interface hierarchy - I usually need the first match and apply its rules to child members. The built-in ...
4
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2answers
433 views

Unit testing a generic interface: proposal to avoid test duplication for different generic types

I'm looking for feedback on a way to avoid massive code duplication on unit tests of a generic interface. It is expected that the interface will have several dozen implementations with common ...
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3answers
187 views

Generic implementation of binary search tree in Java

The following is my binary search implementation in Java: ...
3
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2answers
57 views

Generic function that accepts both Actions and Func's as parameters

I've created a generic try catch I can apply throughout my code so I'm not repeating myself. ...
5
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4answers
771 views

Take a desired string, iterate through objects to see if it exists in a given field and append a number until a unique string is found

I wanted to in the most generic way possible write a method in C# to achieve the following. Take in a string, a set of objects, and a function to access the field of a given object Look at all of the ...
-4
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1answer
55 views

Generic Custom STACK Class for Hanoi Problem in C# [closed]

I have created a custom class (Generic) in C# for the Hanoi problem. and I am not sure I did the correct thing. ...
3
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1answer
6k views

Generic Repository without Entity Framework

Almost all of generic repository pattern tutorials were making use of EF, so I haven't got much sources to compare my code with. Here is what I have done. Could you please suggest me to fix my wrongs ...
10
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6answers
5k views

Calculate fingerprint for an object

I need to store serialized objects in a database and I want to avoid duplicates. In order to be able to tell wheter an object is already stored, I have to compare them somehow. My idea was to ...
2
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2answers
70 views

Creating keys/names from interfaces to avoid strings

There are many APIs that require some kind of a string key/name. I usually try to avoid using raw strings and prefer to use ...
5
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1answer
52 views

Enum for handling network request errors in Swift

I'm working on a new API written in Swift 5 and I wanted to play with the new Result. I wanted to know what you guys think about this syntax: ...
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0answers
79 views

Spring (boot) MVC Abstract Controller

I'm writing an application that will end up with a set of standard CRUD operations for a bunch of object types, and I thought it would help simplify things if all the separate controllers had some ...
8
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3answers
1k views

Heap implementation for numeric types

I am trying to improve the quality of my code as well as trying to study the Heap data structure. I have implemented a minHeap (Heap in which minimum value nodes ...
3
votes
0answers
41 views

N-Queens problem using other pieces using Go

I wrote a solution to a problem based on the N-Queens problem which should use more pieces than just queens. Problem is it's very slow, it probably has to do with how I modeled data and my lack of ...
2
votes
1answer
340 views

Webservice class with parser using generics

I'm currently building a small web stack in swift for use in my iOS apps. It consists of multiple components and I want to make it resource specific; To that end, I have a ...
0
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1answer
79 views

Generically call static methods

I currently have two (core) classes : ...
1
vote
2answers
104 views

Typed properties in Java

I tried to build a "typed" property system in Java and this is what I came up with: first the class Properties that any class can use as an attribute (demo code in the end). ...
3
votes
1answer
80 views

Generic Macro Generated Hashset in C

The Hashset uses open addressing, linear probing and Robin Hood hashing for handling collisions. It comes with insert and remove ...
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0answers
23 views

Calculate mean of vector primitive numerical values generically

I'm trying to write a generic mean function for all values within an Vector of generic numerical primitive type. Could the following implementation be possible ...
2
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1answer
148 views

Generic Macro Generated Linked List in C

Generate a linked list of any type using macros. The linked list contains functions for adding and removing elements to both ends and also at the middle. You can also add elements relatively to a list ...
3
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2answers
731 views

Optimize OrderBy Generic Method

Here is my OrderBy method which includes concatenated column names. Can this be achieved more efficiently? ...
0
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2answers
82 views

Generic function, which populates a collection based on collection interface implementation

As the above title states I have a function that I use to populate a collection's status names, currency names and other information that I do not store in the database. This is my function: ...
2
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1answer
50 views

Batch downloading to file or memory

This is likely my first useful piece of Rust code. Planning to crate-ify it. It works. ...
3
votes
1answer
113 views

Map, which contains biomes, which contain landforms, which contain tiles

I am trying to model this: a Map can have multiple child of type Biomes and no parent a Biome can have multiple child of type Landforms and a Map as its parent a Landform can have multiple child of ...
3
votes
1answer
94 views

Rust closure to be called on a cache miss

The official Rust book chapter 13.1 includes an exercise to expand on the example provided in the chapter: Try modifying Cacher to hold a hash map rather than a single value. The keys of the hash ...
0
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0answers
34 views

Templated JSON parsing methods that work with an element or elements array

Consider the following two Java methods. The first takes a JSON string representing one element, the second representing multiple elements. gson.fromJson() can be ...
2
votes
1answer
71 views

Swift: arrayToTree() where array contains int and nil

I am learning tree on Leetcode. Need to prepare the testing data. It is easy to convert the array to an organized node, where its elements are integers. such as ...
3
votes
0answers
44 views

Generic router in Rust

I am trying to make a router in Rust using Rocket.rs. I'd like to devise a way to use a default router for my more simple db tables that don't require different logic, to prevent rewriting the same ...
3
votes
1answer
332 views

Protected Pointer: a unique_ptr wrapper that auto encrypts and decrypts data in memory

When dealing with sensitive data, it should be protected from modification and unauthorized viewing as much as possible. This is what this ProtectedPtr class aims to do: encrypt your data when you ...
0
votes
1answer
64 views

Recursive fluent builder

Problem statement I have entities whose relations form a graph. As an example, let's imagine Users and Groups. Each user has a <...