Tagged Questions

Use this tag for reviews of code where type safety is a concern, for example code involving type conversions or casting which may result in type errors at run-time.

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3
votes
1answer
126 views

Removing asInstance[T] from scala code

I've written this scala code and I cannot work out how/if it is possible to remove the asInstance in the definition of class ...
2
votes
2answers
26 views

Enforcing Type with Boiler Plates

This is an implementation of Mat's List using by Pseudo-inheriting my Pythonic-List. Inheritance is not built into VBA, but it can be simulated by composing the inherited class and mimicking all it's ...
4
votes
2answers
80 views

Traversing and printing complex Dictionary types (Scripting.Dictionary) - Dictionary inside of a Dictionary

Based on this SO post - also reposted on vba4all.com with a few more details and explanations. Please notice there currently is no error handling whatsoever as I didn't analyse and consider any traps ...
2
votes
0answers
47 views

Existential Types and IO

In my attempts to grasp Existential Types in Haskell I decided to implement an integer-based fixed-length vector data type. I'm using ghc 7.8.3. Specifically I wanted to write a program which asks ...
0
votes
2answers
228 views

RESTEasy client that should use generics

I have written some code using RESTEasy to handle RESTful service calls and parse the response XML into relevant JAXB annotated classes. At the moment I have seperate methods for each return type: ...
6
votes
3answers
723 views

Simplifying a series of type checks and casts in a generic method

The if/else statements below are not good. How can I improve this method? ...
2
votes
1answer
46 views

Aggregating values of a path-dependent type

I have a type representing an immutable order which contains immutable order lines that belong to it. I want to use path-dependent types for this. Obviously you cannot instantiate a path-dependent ...
4
votes
2answers
106 views

Function object passing for a task scheduler

Here is my full implementation of a generic Functor-like class: ...
10
votes
1answer
59 views

Methods creating transform functionality on Collections

I have written a few simple-to-be-used methods in Java 8, and am wondering what could be improved upon those: ...
13
votes
3answers
255 views

Type-safe Date class with total encapsulation

I want to teach about "encapsulation" and chose Date with Year, Month and ...
4
votes
2answers
82 views

Pattern for storing object of varying type

I have a situation where I need to store fields of differing types of some data structures along with some similar metadata (The application takes data from one of many sources, some data possibly ...
10
votes
2answers
267 views

Nullable<T> Implementation for VB6/VBA

Because I was spoiled with C# and the .NET framework, whenever I have to work with VB6 I feel like something's missing in the language. A little while ago I implemented a ...
6
votes
2answers
123 views

Type safe program uniform manipulation in OpenGL

I've made an attempt at writing class wrappers around basic OpenGL objects to make managing them easier and more intuitive. Writing a generic one for program uniforms proved to require a little bit ...
10
votes
4answers
441 views

Type system for different representations of angle value

I want to implement a Type system for different representations of an angle value. Motivation to implement this as a type system comes from this question. Angle can be represented using the ...
2
votes
2answers
243 views

“Hell Difficulty” Haskell Fast & Hard

I'm a complete neophyte to Haskell with only a smidge of FP experience – I did some Racket programming academically and have written some semi-FP JavaScript professionally, but now I'm trying to learn ...
1
vote
1answer
222 views

Java reflection: Inject data generically and safely

I have become interested in reflection and I wrote a class to wrap an Object so that I can access its private instance fields. The code works great. I do not need to wory about the exceptions in the ...
7
votes
1answer
159 views

Embedded conditional code compaction

I'm porting some AVR code from PROGMEM/PGM_P to __flash, and I want to reduce the amount of ...
7
votes
1answer
163 views

Revisited IsTypeSafe method implementation for “type-safe” List

Following up on List<T> implementation for VB6/VBA, I'd like some thoughts about the revisited IsTypeSafe function, below. The previous version pretty much ...
14
votes
2answers
1k views

List<T> implementation for VB6/VBA

Recently I decided VB6's Collection wasn't enough for my needs, so I decided to implement something like C#'s List<T>. ...
2
votes
0answers
782 views

Event system using callback functions in C++

I am learning C++ and have been trying to create an event system for use in a small game. This will be the mechanism by which game entities communicate. I would be eternally grateful if someone with ...
2
votes
3answers
198 views

An attempt at a simple type safe python enum

There have been many posts here about enums in python, but none seem to be both type safe and simple. Here is my attempt at it. Please let me know if you see anything obviously wrong with it. ...
2
votes
1answer
91 views

Pythonic type coercion from input

My context is a very simple filter-like program that streams lines from an input file into an output file, filtering out lines the user (well, me) doesn't want. The filter is rather easy, simply ...
1
vote
3answers
161 views

Can I somehow tidy up this (overuse?) of generics?

I'm building a generic flat file reader which looks something like this. ...
2
votes
0answers
104 views

Imroving GADT type-safe code for AA trees

As an exercise on GADTs I wrote a type-safe implementation of AA trees. I'm quite happy that the AANode data type correctly grasps the properties of the tree. Just ...
1
vote
1answer
627 views

Loading an Object from File with Type-Safety and Thread-Safe access

I'm attempting to write a bit of code that allows for easy and safe access to objects in a file. It seems to work great but I was curious if there was an easier way to do this or if Java already has ...
8
votes
2answers
7k views

Type-safe Dictionary for various types

Assume the following situation: you have an object that can store any object based on a key (basically, IDictionary<string, object>). You want to store ...