Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [delegates]

Delegates can refer to several concepts. An object can rely on another (a delegate) to perform a function. Delegation can also refer to programming language feature making use of the method lookup rules for dispatching self-calls. In C#, a delegate defines which method to call when an event is triggered.

3
votes
0answers
100 views

Java - propagating a threadlocal by wrapping a runnable

My aim is to use a thread pool together with a thread local. I cannot use InheritableThreadLocal because the thread data is different per user and there a couple of ...
4
votes
3answers
3k views

Measuring method execution time

I want to easily measure method's execution time. Of course instead of doing something like this: ...
5
votes
3answers
1k views

Several approaches to a logging class

I'm making a personal logger and so far I have come up with 3 solutions. I have them simplified in this example to highlight my dilemma. I want to know the pros and cons of my approaches and ways to ...
2
votes
2answers
79 views

Counting quiz for children

I made a game for children. This game tests the ability to count (i.e. compare numbers based on magnitude). First you must select the age of the child in the upper menu, then you need to select blocks ...
1
vote
2answers
98 views

Selecting multiple filters based on the true/false conditions

I wrote a method to select the filters (two or more) based on the true/false conditions. Here is the method I used for selecting the multiple filters: ...
2
votes
1answer
148 views

Amplitude and Frequencies of sound Analyser

As I'm beginner with mobile/OO programming, I reached a situation that confused me and made me wonder if I was coding correctly... The main class: ...
1
vote
2answers
91 views

View controllers and delegation for a weightlifting app in Swift

I've got several UIViewControllers that are trying to do too much so I'm trying to learn how to clean them up so that they only have code that does UI things (...
3
votes
1answer
866 views

Event delegation without jQuery

I created event delegation like concept which is present in jQuery. AFAIK, event delegation is used to register an event for an element which is supposed to be added dynamically. So, in jQuery we do ...
7
votes
1answer
649 views

iOS delegation design pattern

I am working on a project that has a Model-View-Presenter structure and use the delegation design pattern that has the following structure/implementation. I would love feedback. The ViewController ...
6
votes
2answers
904 views

Type-Safe Event System

I have recently started writing C# from a strong JavaScript background, and found myself wanting to do something I do all the time in JavaScript: events. Since I have a type system at my disposal, I ...
5
votes
1answer
3k views

Unit test if an event has been raised or not

Given the following event dispatcher code ...
3
votes
1answer
4k views

Removing all delegates from an event dispatcher

Given a class which is an event dispatcher whose underlying store is a dictionary of events whose key is the event type ...
2
votes
1answer
88 views

Writing strings to the screen over time

The following methods just write strings to the screen over time to make it look like a typing effect, instead of all at once. The only difference is the argument in the ...
5
votes
1answer
167 views

Simulate a person who is working in a quarry with classes

I build my first "bigger" program with classes. Does this look good? Or do you see something, which I could do better? Do you think I could use a delegate for changing the stones to money here? And ...
7
votes
1answer
83 views

Using delegates to avoid duplicate creation of resources

I'm writing a PCL that uses an HttpClient to go visit a few sites and extract data from them. My initial code looked like this: ...
3
votes
1answer
92 views

Managing a wish list from an API

I have a class that I use to manage a list to/from an API in Swift. Using a clean code approach, I'm wondering if, how, and why I should change it when I have a class that uses it for just one or two ...
6
votes
2answers
392 views

Is my Delegate defined the right way and does it need to transform to a pretty Event butterfly?

I have read so many bed time stories and ins and outs of how delegates work and why events are to be replaced with delegates (surely not all the time) and just couldn't get my head around it. I am ...
3
votes
1answer
2k views

Invoking only the last registered event handler

We are building a game and we have a dialog system. Dialogs may open and stack on top of one another. When every dialog opens, it registers itself to handle the BackButtonPressed event: ...
4
votes
1answer
1k views

Asynchronous API calls with delegates and event handlers

I'm making a WindowsPhone 8 app in C#. With this an API so I can convert JSON data into useful objects. I've found a method but am wondering if it is any good at all. The problem is it's been a while ...
6
votes
2answers
304 views

C# program that uses events

I am trying to learn C#. Please tell me if the following code respects coding standards and naming conventions because I want to write beautiful code. The purpose of this program was to help me ...
4
votes
1answer
340 views

Stop Watch Application 2.1

After the tips from my previous review. I have come up with these changes: Separation of Concerns Use Delegates I'm asking you guys if this looks good. Other then separate out the ...
3
votes
1answer
164 views

Mixing Watir::Browser into RSpec

In my previous Watir question I was making a module with session_FF accepting a block. Now I want to make the same but via RSpec. Here is my try: ...
36
votes
2answers
3k views

Wait, is this… LINQ?

Context I'm working on a little project that consists in a series of Microsoft Excel add-ins (.xlam). The code being submitted for review here, is located in the ...
9
votes
2answers
684 views

Generating and calling code on the fly

Delegate This class module defines what I'm calling, in this context, a Delegate - here a function that can take a number of parameters, evaluate a result, and ...
4
votes
3answers
414 views

Command-line program for applying several operations on a PDF file

I am building a command-line .exe that can apply several operations on a PDF file (add text, images, resize, crop, etc). Currently, my Program.cs looks a bit like this (it uses CommandLineParser): <...
5
votes
2answers
2k views

Lock-free multiple producer single consumer message queue

For a while now I've been after a lock-free, simple and scalable implementation of a multiple producer, single consumer queue for delegates in C#. I think I finally have it. I've run basic tests on it ...
3
votes
1answer
22k views

Sending a HttpRequest Message, and retrying in case of unauthorised

This code simply sends a HttpRequest message and, if it comes back Unauthorized, gets a new login and tries again. This code is meant to deal with the moment a ...
5
votes
1answer
3k views

.NET WCF Activator for sync and async calls

I decided to re-write my code responsible for WCF calls, as all of my methods had try-catch-...
8
votes
2answers
11k views

Is this a correct use of using protocols and delegate pattern in Swift?

I am trying to grasp the concept of delegates and protocols in Swift. So I have implemented my own PlayableMedia protocol with two concrete classes ...
6
votes
1answer
955 views

Retry logic for delegates

I created this class which supposed to take a method and try to execute it. If it fails lets say 10 times, it will throw the original exception thrown by the delegate. Do you have any ideas for ...
5
votes
1answer
635 views

Financial app for retrieving data over a set of dates

I'm writing a financial app that has to get data over a set of dates. The user specifies the start date, end date, and frequency from a list of choices. (daily, weekly, monthly, quarterly, semi, ...
3
votes
3answers
3k views

Test questions - Number Generator, Linq, Delegates, Sequences

I have recently been asked to do a test prior to an interview to test my C# skills. I am fairly new to C# (6 months) and I think this showed with me producing an overly complex answer to their ...
7
votes
1answer
370 views

Delegate and Observer pattern implementation for an embedded system - copy and assignment operations

This is a follow-up to this question, which resulted in major confusion on my side regarding forwarding of arguments. Advice regarding that should probably be given in my question on SO. Overview ...
3
votes
2answers
2k views

Delegate and Observer pattern implementation for an embedded system

I'm writing a set of simple widgets for a microcontroller application. I'd like to use the observer pattern to pass around events: when a button is clicked, when a timeout occurs - there are many uses ...
7
votes
2answers
2k views

Game passive skill system

I'm trying to create some easily accessible database of different skills. General idea is that every skill should do something different and be able to act on different things (ex. one skill which ...
2
votes
1answer
3k views

Delegate that selects a writable property on a generic

In the following contrived example, I have a collection of PropertyManagers that each contains selector and assigner delegates to read from and write to a property ...
3
votes
2answers
109 views

follow-up review of a custom Undo Manager

This is a follow up review of question 'a custom Undo Manager'. After reviewing all the comments and answers, my code has been revised (completely rewritten) based on the review. Summary The ...
9
votes
3answers
3k views

A custom Undo Manager

I am working on building an UndoManager in C#. The concept is to store events and property changes in a ...
3
votes
1answer
5k views

C++ delegate implementation with member functions

I have been implementing a delegate class with C++11 that supports class member functions. I am interested in knowing if there are any potential problems with this implementation. My main concern is ...
2
votes
2answers
718 views

Implementation of delegates for flight operations

I borrowed the code from this question. I'm trying to implement the delegate in that code. Below is my outcome so far. What else can be done to improve this code? Any suggestions? I would appreciate ...
2
votes
2answers
620 views

Refactoring Into Generic Methods

This might be a loaded question, but here goes. I have some code that is very similar between all the methods. I am trying to find a way to accomplish all methods with a generic method/function. I'm ...
2
votes
2answers
5k views

Designing an EventHandler in C++ [closed]

I am writing a simple event handling class in C++, to avoid having delegate registration and calls cluttering the rest of the code. I have a design that seems to do the job, but it has a couple of ...
6
votes
2answers
395 views

Shopping cart using events and delegates

I am trying to learn events and delegates in C#. To do that I am trying to create a hypothetical console project where when some user submits the orders in his/her shopping cart, I need the Billing ...
4
votes
1answer
305 views

State Machine for Character

I come today with a state machine I'm currently working on. Problem: Given any State that the Character is in, a button press or combination of button presses can modify that state in a different ...
5
votes
1answer
2k views

Generic method for database calls

Background Breaking from MVC, I've implemented the following architecture: POST/GET ➤ PHP ➤ Database Calls ➤ XML ➤ XSLT ➤ HTML All database interactions are ...
1
vote
1answer
117 views

Refactoring Java transmitter delegate implementation

I have 3 classes: a transmitter, a view for displaying and a recording view for flushing the screen contents into a file. The view and the recording view classes register themselves from their ...
1
vote
1answer
2k views

Possible memory-leak on a self-removable event handler

A friend of mine asked me a question recently. He was needed to subscribe to an event of some object (window button click) and unsubscribe from it on a first call of a handler. Also he noticed that ...
1
vote
1answer
2k views

Using delegates to communicate between forms and networkcommunicator class

I have multiple forms, each of which would like to send message through the network, using my NetworkCommunicator class's ...
2
votes
1answer
2k views

Putting called delegate into AsyncState parameter - Pros/cons?

I have the following interface: ...
2
votes
1answer
295 views

Delegate for GUI project

I wrote simple delegate in C++11 for my GUI project. I think that some parts can be optimized or cleaned. ...