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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3
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0answers
41 views

Haskell-like function composition function

Much like this question I'm attempting to write in C++ something which can resemble Haskell's (.) function as much as possible, which is basically Chapter 1's ...
-1
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1answer
26 views

Am I using the same Typescript variable? [closed]

I am passing a in as a parameter and want to return b. This works, however I feel like it is wrong because I shouldn't have to ...
1
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0answers
35 views

Connect 4 in TypeScript

This is my first TypeScript program, so I'm curious as to what conventions and optimisations I may have missed. Concerns: I'm not sure whether to check for 4 in a row in the entire board or to just ...
3
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1answer
66 views

How to make it more Scala compatible?

When you write a code in python code people always ask to make it more pythonic. I am not sure if there is a term for scala or not. However, I am pretty sure my following code use one or two scala ...
3
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1answer
100 views

Efficient, typesafe runtime selection between “compiler-checked” sets of static config constant

Motivation / Task An apparently trivial problem.... A CLI app tries to make use of box drawing characters. But depending on the stdout device this may not be appropriate so there is a ...
3
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1answer
67 views

Time provider library using type safe handler - like chrono CPP

I'm trying to develop a c++ library that provide two kind of times: UTC time(self explainitory) System time(time since the system has went on) I have looked into the ...
2
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0answers
23 views

Returns either an object containing two values or an exception if values or not a valid range

I have two functions, one that returns two values min and a max and another function that serves as a guard. However I would ...
-1
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3answers
47 views

Implement state eraser for NIST DRBG and other crypto primitives using macro

As a spare-time personal project, I'm implementing a set of symmetric-key cryptographic primitives. One thing I've left vacant for a long time, is the key/state eraser, which I decide to add right ...
4
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1answer
68 views

Single-thread Task Scheduler with type erasure and allocator-aware

I made a task scheduler to practice allocators and type erasure. With my project, you can delay execution of any callable (functions (using std::ref), lambdas...) ...
4
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0answers
98 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 ...
3
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1answer
61 views

Range validator for multiple types

I have an existing overloaded set of functions that I cannot change and need to be tested: ...
2
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1answer
9k 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 ...
5
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1answer
52 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 (...
3
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1answer
141 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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0answers
46 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 ...
0
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1answer
116 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: ...
1
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1answer
47 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
420 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 ...
18
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2answers
886 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 system,...
5
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2answers
225 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 ...
2
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1answer
68 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 ...
1
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2answers
86 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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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
74 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 ...
4
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2answers
1k 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 ...
2
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1answer
144 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 ...
3
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3answers
137 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
732 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
81 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
36 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
60 views

Type System for Layers and Nodes

Overview The following is a type system of layers (A, B, C, ...
4
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1answer
521 views

Wrapping an IntPtr in a Struct for safer Interop

Consider the following C#/C interop scenario: ...
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2answers
66 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 ...
0
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1answer
756 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
386 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 ...
1
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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. ...
8
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1answer
241 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 ...
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0answers
51 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 ...
4
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1answer
79 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 ...
7
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1answer
5k 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: ...
6
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0answers
204 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 ...
3
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1answer
178 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, ...
28
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3answers
2k 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 ...
3
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1answer
2k 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, ...
3
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2answers
47 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 ...
1
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1answer
632 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
36 views

Robustness of this first difference function

Here is a first difference function I threw together for a quick check in another program: ...
5
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2answers
147 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
144 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. ...
13
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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 ...