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Questions tagged [callback]

Callback is facility to save a piece of code so that it may be invoked later in the current environment (Typically in response to an event)

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Event callbacks library

This is a small library I wrote to make event callbacks with variadic templates work like C#'s event system (placeholder template by "dyp" at http://stackoverflow.com/a/21664270). Just like ...
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1 vote
0 answers
25 views

Add to Favourite List example - working but with performance issues

I am building a small framework for e-commerce or blog app using React. One of the features of this framework is an "Add to Favourite List" function. The ...
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1 vote
1 answer
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c++ multithreaded message broadcaster with link lifetime management v2

note: This is v2 of code that was previously reviewed. I have written a class that handles listeners registering callbacks to receive messages. Link lifetime is managed (or is it?). Code is ...
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1 vote
1 answer
35 views

c++ multithreaded message broadcaster with link lifetime management

note: A version of this code without link lifetime management was previously reviewed. Adding lifetime management actually made the code simpler, and the class simpler to use. I have written a class ...
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2 votes
1 answer
463 views

Generic Event class

C++ Event class From the desire of having a callback function which includes a void* userdata argument, I've made this generic event class. It is tested and working, but some desired features are ...
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0 votes
2 answers
199 views

C++ Observer Pattern with std::function

I am/we are using the observer pattern for many things in our application. I think it's time to create a reusable base class for these situations. Most implementations I could find only do something ...
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3 votes
2 answers
68 views

Simplify 2D point angle comparator

I have a comparison function for comparing two points in 2 (or more) dimensions based on the angle of each point in standard polar coordinates. In other words, a point ...
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4 votes
2 answers
425 views

C++ Generic Callback class with removable listeners by unique id

I'm quite new to the STL. Does this make sense? Is there a better way of removing the listeners instead of using shared_ptr while keeping the code short and simple? Is there something in the STL to ...
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1 vote
1 answer
296 views

c++ multithreaded message broadcaster using callbacks

note: This is an updated design after a previous review round. I have written a class that handles listeners registering callbacks to receive messages. Registered callbacks can be replaced or removed. ...
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1 vote
1 answer
2k views

C++ callback multithreaded, can unregister itself

update: a new version of this code is posted here With this post, i would like to 1) ask for feedback on below code as it stands: do i apply all best practices for c++20? is it safe? is my way to ...
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3 votes
1 answer
100 views

Cyclic generator with access to current local state and executes callback after each cycle

I'm working on a Python class that is a cyclic generator, like itertools.cycle, but it offers access to its current state and executes a callback after the ...
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6 votes
2 answers
147 views

Error Code Stack Trace and Propagation Library in C

I've been programming in Go and I enjoy how easy it is to create descriptive errors and propagate them up the call stack. I wanted that sort of ease and consistency in C so I created a small error ...
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2 votes
1 answer
160 views

Supplying parameterless callback to function expecting void * param

I have to register different callback functions to a scheduler. The callback signature defines a void * parameter. Some callbacks don't use a parameter. This works, ...
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2 votes
1 answer
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Login system using callbacks in android

I wrote a login system for an app I am developing, but I'm not really happy with the code I have at the moment. I feel like there is a better way at tackling a problem like this. In particular I'm not ...
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3 votes
1 answer
751 views

Stateful function pointer for passing C++ capturing lambdas / std::functions to C style callbacks

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3 votes
1 answer
262 views

Callback C++ Class method from C

I am trying to callback C++ class methods from C. Now I have got something working, but am not sure if this is the best solution. I am looking for feedback, as to if there is something wrong with this ...
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1 vote
0 answers
52 views

AIPlaylist: Adaptive media player using VLCJ and Swing

I created a project using VLCJ and a probability function to create a media player that plays your favorite media more often than the others, because I wanted to hear my favorite music and videos more ...
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0 votes
1 answer
52 views

Registering a user and login

I have these following controller functions for registering a user and login, in my app, and I want to make it more clean and maintainable. Probably by using ...
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5 votes
2 answers
292 views

Message Broadcaster

I've written a basic event messenger broadcasting service. This is meant to allow for broadcasting events between loosely coupled areas of code where you may not have or care about a direct reference ...
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3 votes
2 answers
235 views

callback function with no dynamic memory allocation

I tried to make a callback type for embedded, I know std::function and lambda but I know that there is some dynamic memory allocation that I want to avoid, I came ...
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4 votes
1 answer
796 views

It's Teetime; adding tee like functionality to Popen

I recently needed to run some command line applications from Python. Whilst this is fairly simple with subprocess.Popen. I wanted to be able to properly pipe the ...
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2 votes
2 answers
108 views

Bitmask, How to abstract those callbacks in this implementation

I've made an POC about a bitmask implementation in order to replace a huge if/else statement. Those statements are about strings and I have almost 15 /20 string to test. Depends on values the if/else ...
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5 votes
2 answers
109 views

Simple replacement for Redux in ES6

The idea about this code is that it's a full replacement of Redux — in 22 lines of code. ...
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  • 537
13 votes
2 answers
3k views

Implementation of a Thread Pool in C++

I wanted to implement a thread pool to test my knowledge of various modern C++ features. The end result could be better, but I need a review as I'm not sure about delicate things especially regarding ...
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2 votes
0 answers
26 views

Customizable unidirectional questionaire in javascript

I wrote the below answer for the following question on SO a couple of days ago, and I was curious if the usage of the generator function is an acceptable one. I choose the generator function, because ...
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3 votes
1 answer
62 views

Callback usage with custom Stack Exchange Flair

Today I decided to continue refining my JavaScript skills and utilized the Stack Exchange API (v2.2) to write a "user flair" replica. In case you don't know what the flair that SE provides is: The ...
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3 votes
1 answer
77 views

Ajax function with a callback

I have Ajax function with a callback which fetches all the Patient data however I have some perfomance issues and trying to figure out what it might be, does anyone have idea? That's my Code ...
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1 vote
0 answers
68 views

React.js hook to validate a form on submission

I am fooling around with hooks in React and I'm stumbling against decisions that I need to make regarding implementation. Below is the code for the custom useForm hook which can be used to hook up ...
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3 votes
1 answer
211 views

std::function alternative with no dependencies

An alternative to std::function for when compile time is more important than runtime performance. Doesn't pull in any headers. (...
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0 votes
0 answers
75 views

Helper to convert arbitrary function into a custom deleter

If you want to use a custom deleter in unique_ptr you either have to pass a functor or the signature of a delete function as template argument. If you have a ...
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1 vote
0 answers
20 views

Creating a reusable plugin (Dialog/Notifier as example)

I started working on a notification system that is pluggable into any project. I have not made any "plugin" type javascript libraries, usually just functions very specific to the project at hand. That ...
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4 votes
1 answer
476 views

Wrap a callback method in an awaitable method

I'm using a .NET library which uses a pre-async/await type of asynchronicity. That is, it provides asynchronous (non-awaitable) method with a callback parameter. I'm trying to write awaitable ...
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0 votes
1 answer
113 views

Chaining ConstrainableSet<T> [closed]

Based on feedback on my previous question, I made many small adjustments to the code, added more APIs and tried to follow through with delivering on the excellent advice I have received in regards to ...
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1 vote
0 answers
66 views

C# asynchronous notification vector v2

As a result of my previous post, I have implemented / refactored my code and have started making successful use of my class. However I have come across a couple of new questions: The observer must ...
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4 votes
1 answer
125 views

Constraining a property setter fluently

The below code is aimed at providing you the most amount of control and flexibility with control which value gets set to a property. I Introduce to you, the ...
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6 votes
1 answer
106 views

C# asynchronous notification vector

The purpose of this class is to efficiently notify another thread when data is available with minimal blocking to access/pass the data. The data reader/producer thread processes data in bulk which ...
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  • 243
2 votes
0 answers
24 views

UI Event Flow class

Purpose: I wanted a way to improve event clarity and event code organization. I observed that every single event flow went through the following steps: Trigger -> UI Change -> (Async) ...
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4 votes
2 answers
123 views

Function to call a list of callables with retry

This script is designed to be run via windows task scheduler once per day. All callables passed to this function should only return a bool. The callables are called until either the maximum number of ...
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0 votes
1 answer
35 views

Updating one model field based on the associated model's field

I'm wondering if there is any way we can optimize the following code. Scenario is Library's active field should be ...
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4 votes
3 answers
4k views

Simple Publisher Subscriber in Java

I am new to Java and had some difficulty creating this simple Publisher Subscriber class. It finally seems to be working and I wanted to check if I have been following best practices and see if there ...
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3 votes
1 answer
3k views

C++ wrapper for GLFW window object

I'm creating a window class in C++ to provide a bit of abstraction for a GLFW window. window.h ...
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0 votes
1 answer
1k views

pass argument to jQuery .on() event handler callback [closed]

In my web application, a user will click a button which will call a function that triggers an AJAX call. That function accepts a single argument. I would like to be able to put that function in ...
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5 votes
2 answers
141 views

Event emitter npm module

I was asked to complete the task described below: Event Emitters are objects that serve as the core building block in event-driven architectures. They simplify the process of handling asynchronous ...
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1 vote
0 answers
87 views

Correct Callback for each item

I have added a correct question callback for different types of questions like: radio, checkbox and descriptive.. QuestionListActivity.class (it shows the list of questions to attempt) ...
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3 votes
2 answers
119 views

jQuery handler to update map UI based on AJAX response

I am working on a university project that consists of creating a map application with openlayers as well as the necessary User-Interface. I am using jQuery, native JavaScript, PHP and of course HTML/...
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  • 31
4 votes
1 answer
2k views

Simple event dispatcher

Here is my very first event dispatcher. I would like to get both, style and code review, as well as some ideas to improve this implementation (new features etc.) I tried to write code in C++17 style ...
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1 vote
2 answers
65 views

Class that provides callback execution at a specified rate

Here is a class I wrote to provide a user a way to have a callback function executed at some defined frequency: Task.hpp ...
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2 votes
1 answer
459 views

Extracting data from vue-chartjs into an array of datasets

I have a function which returns an array of datasets for a chart written with vue-chartjs. The getter getChartData returns an array with three objects with nested ...
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  • 155
2 votes
0 answers
54 views

Controller to execute AJAX requests for a client

I have been developing this structure or pattern (I don't really know how to call it). It's my first time doing something like this, and I'm a bit worried about the future, if it becomes unmanageable. ...
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  • 43
6 votes
1 answer
2k views

Simple implementation of signals and slots mechanism using templates

I tried to implement a simple signal&slots mechanism for some DSP software that runs on embedded Linux. I would like if somebody can review this code and give me some guidelines. Any review and ...
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  • 63