Questions tagged [type-safety]

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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57 views

Type & Thread-safe Logger Implementation

So I had previously posted this question and asked for some feedback regarding my (now) header-only logging system and figured it would be a good time to go back to the changes I made it and see if it ...
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0answers
30 views

Range validator for multiple types

I have an existing overloaded set of functions that I cannot change and need to be tested: ...
5
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1answer
30 views

Typescript monad for data being loaded

I have been struggling to make typescript happy about the types. I am pulling data from our backend API and I wanted to give context to the data. Basically it is a monad with 4 shapes: Initial (...
2
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1answer
132 views

TypeScript implicit 'any' type with computed property key

(irrelevant code removed for demo purposes) I am new to using TypeScript and I have this React component which has an object literal inside the component, which I'm then accessing using a computed ...
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1answer
43 views

Python simple type checking decorator

I'd like to know your opinions on this minimal type-checking decorator (with @ annotations) to make type checking of a method while debugging like : ...
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4answers
36k 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 ...
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0answers
37 views

typeOf in Python [closed]

I've been working in statically typed languages for awhile, and I've had to write some Python utilities recently. As part of those tools, I needed a semi-sane way to implement type checking to make it ...
1
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1answer
39 views

TypeScript 3 form validation object

Please, correct me with anything that I say in here (The actual question is below the code). I've been quickly prototyping a project (ASP.NET Core 2.1) and haven't found the need to structure it with ...
0
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1answer
31 views

Potential type-safety issues on object parsing function in DXL

I have inherited the maintenance of a DXL script (for IBM Doors). In this, I came across various examples of stuff that make me scratch my head. Take this example: ...
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1answer
41 views

Generating Image & Serving via HTTP with Go

What is does I'm reading The Go Programming Language. Below is my code for the last exercise in the first chapter, which is to create a webserver, generate an image, and serve the image via the ...
2
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1answer
198 views

Login system with password reset sent to e-mail using PHP and PDO

I really like to use PDO because it's simple and easy to make a safe query, i prepared all queries and used placeholders, i think it's safe but i'm not sure at all, and I'm thinking if i used ...
16
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2answers
844 views

Enforcing string validity with the C# type system

One of my biggest complaints about .NET is that there's no way to guarantee a string match a certain type in the type-system. Note This started as more of a proof-of-concept than a real usable ...
4
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2answers
531 views

Type-safe JSON deserialization

In a Python (3.6) application I receive messages from Kafka in JSON format. (The code base makes heavy use of static type annotations, and every file is automatically checked using ...
5
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2answers
101 views

add_const or remove_const based on another type

Here is a type trait which - I feel - could fit in std next to std::add_const and ...
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2answers
84 views

Function to map letters to numbers

I have a method that converts characters to numbers. It expects a single alphabetical character and returns the equivalent number. For example, if A is provided it returns 1, for B it returns 2. If an ...
2
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1answer
87 views

Detect single-character xor (OCaml)

I have been working through the Cryptopals challenges in Ocaml. My interest in Ocaml is to better learn functional programming techniques and effective usage of the type system. Set 1 Challenge 4 ...
6
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1answer
3k views

Validating a list of dictionaries of names and tags

I created a Python function to check the types from a list and also check the keys inside an dictionary within that list. I have the following data: ...
2
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0answers
47 views

SI type safe unit calculations (revised)

This is the continuation of the questions raised in this thread I did include the improvements that were mentioned but still feel like, I do more copies than I need to. Also I am unsure about the ...
4
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1answer
70 views

SI type safe unit calculations

I wrote a small type-rich MKS Unit system for the consistent and safe calculation of physical units in everyday use. I realized some operators' implementations via the Barton-Nackman trick while ...
3
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3answers
120 views

Safely & portably read a value into a predefined integral type of varying size like mode_t

I need to read a value from a text file and put it into a predefined type, in this particular case mode_t. This typedef can have a variety of types underlying it, ...
8
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3answers
703 views

'StrictInt' Python object class that prohibits casting numbers with non-integer components to `int`

Inspired by and created because of python3 utility: convert safely to int and driven partly by the 'refactor' in my answer. The aforementioned question and my answer drove me to go and do a thing ...
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0answers
64 views

Redux-like implementation in TypeScript

I need to write a custom reducer utility. It should take a dictionary of reducers and a publish subject to return a state, with a dispatch method to dispatch ...
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0answers
33 views

Type conversion between Node, Const_node, and their views

Each node is a location within a layer. A Location may be a pointer or an index. A Layer is a container. There are 4 types of ...
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0answers
59 views

Type System for Layers and Nodes

Overview The following is a type system of layers (A, B, C, ...
5
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1answer
199 views

Improving General Algebraic DataType 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 ...
4
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1answer
350 views

Wrapping an IntPtr in a Struct for safer Interop

Consider the following C#/C interop scenario: ...
0
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1answer
614 views

Scala type matching map

I was working with some complicated generics system, and I found the need to make an abstraction for a typesafe mapping between K[T] and V[T] where T is the same for individual pairs. In the case ...
5
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1answer
312 views

Simplified encryption API wrapper for RSA and AES

I'm working on an encryption library to simplify how my team uses encryption for api credentials and receiving encrypted messages from other teams/projects. This code is wrapping java.security and ...
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2answers
63 views

Function that checks if array only contains elements of a specific type

The function checks whether an array is of a specific type (only contains elements of that type), the types the function accepts for checking is basically all the JavaScript types plus any types that ...
12
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1answer
2k views

C++ identity function

I've implemented an identity function (well, actually a functor struct) in C++. The goal is that every occurrence of an ...
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1answer
52 views

Functions that build a path to the model and command files for some tests

I'm currently working in a model-based testing tool. I'm writing some integration tests for it, which require two kind of input: Model files: which contain models to be parsed and run by the tool. ...
7
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1answer
206 views

A type for prime numbers

I have recently discovered that in type theory there is a concept of a "predicate type" which is a type \$A\$ formed out of all members of the underlying type \$U\$ that satisfy a given predicate ...
7
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2answers
348 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 ...
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0answers
50 views

Extensible XML parser

Context My aim is to write an RSS parser that can handle extensions in a generic and type-safe way. I already have a working RSS parser, the missing part is the extensions handling, which is the ...
6
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0answers
185 views

Value semantic type eraser

I've been using std::unique_ptr for cases where I want to store a derived-type value with type erasure, and felt that unique_ptr being nullable was an undesirable ...
4
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1answer
69 views

Convertible templated math vector

I've made a templated math vector struct with a templated type and templated dimension count. I want my vectors to be convertible so I can easily make, for example, a ...
3
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1answer
132 views

Area under curve

The following code is a solution to a Hackerrank problem in Haskell. Given a list of polynomial coeficients a and exponents b, ...
27
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3answers
1k views

A Failable<T> that allows safe returning of exceptions

This was inspired by a conversation in chat, that started with the discussion of C#7.0 tuples and out parameter declarations, which led to the idea that there is no 'good1' way to return an error ...
19
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1answer
359 views

Suggesting “safe enum” class for ISO C

There are quite some questions and answers about how to make enum really type-safe and I didn't find a solution that ensures both type safety and valid values. So I ...
7
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2answers
14k 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 ...
3
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1answer
1k views

All combinations of 2-value variables

Introduction This code was part of one of my projects where it was used to generate boolean input values for truth tables. I have since generalized it for combinations of variables with only 2 values,...
44
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3answers
10k 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>. ...
3
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2answers
46 views

Adding numbers of any type

I'm writing an interpreter, and I'm designing the abstract syntax tree currently. Right now, I'm trying to figure out a way to add (or do other operations with) two ...
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1answer
498 views

C++ conversion from std::string to arithmetic type using std::locale::classic()

I recently had a bug where extracting a decimal from a string failed due to locale settings. That is, some locales use a , as a decimal point, rather than a ...
3
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1answer
655 views

Check if JavaScript input is empty

Having a general utility function to see if the input is empty makes sense to me. Empty means different things depends on the type. I just spent ~5 minutes writing this one up, so I'm sure it's ...
3
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1answer
36 views

Robustness of this first difference function

Here is a first difference function I threw together for a quick check in another program: ...
4
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2answers
144 views

TextBoxes for various number types

Is there a way I could somehow have all this classes condensed into one, while keeping the code as clean as possible? They are all doing essentially the same thing, just for the different number type....
3
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0answers
130 views

Deque class using typing module

I wanted to make a class for type hinting that the result of a function is a homogenous deque. ...
3
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1answer
2k views

A small generic array in C

The generic arrays in C I found on the net used either of these methods: The preprocesser with #define and #include (a lot of ...
3
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1answer
131 views

Constrained type alias

What do you think about the following syntax for some very simple and intensively reusable validations? Does this: string name = (SomeText)"Hm…"; mean for you ...