Delegates vs. Function Pointers, part 3: C# 1.0

This is part 3 in a series about state and function pointers; part 1 is here.

Last time, we saw that it is impossible to bundle context along with a function pointer in C.

In C#, it is possible to fully achieve my standard example.  In order to explain how this works behind the scenes, I will limit this post to C# 1.0 and not use a lambda expression.  This also means no LINQ, generics, or extension methods, so I will, once again, need to write the filter method myself.

delegate bool IntFilter(int num);

static ArrayList Filter(IEnumerable source, IntFilter filter) {
    ArrayList retVal = new ArrayList();

    foreach(int i in source)
        if (filter(i))
            retVal.Add(i);
            
    return retVal;
}

class GreaterThan {
    public GreaterThan(int b) {
        this.bound = b;
    }
    int bound;
    public bool Passes(int num) {
        return num > bound;
    }
}

int x = 2;
int[] numbers = { 1, 2, 3, 4 };
Filter(numbers, new IntFilter(new GreaterThan(x).Passes));

Please excuse the ugly code; in order to be true to C# 1.0, I can’t just write an iterator, and I can’t implicitly create the delegate.

This code creates a class called GreaterThan that holds the Passes method and the state used by the method.  I create a delegate to pass to Filter out of the Passes method for an instance of the GreaterThan class from the local variable.

To understand how this works, we need to delve further into delegates.  .Net delegates are more than just type-safe function pointers. Unlike the function pointers we've looked at, delegates include state – the Target property. This property stores the object to pass as the hidden this parameter to the method (It's actually somewhat more complicated than that; I will describe open and closed delegates at a later date).  My example creates a delegate instance in which the Target property points to the GreaterThan instance.  When I call the delegate, the Passes method is called on the correct instance from the Target property, so it can read the bound field.

Next time, we'll see how the C# 2.0+ compilers generate all this boilerplate for you using anonymous methods and lambda expressions.

62 comments:

This curiosity you describe is fantastic Rita

The above article is nice and interesting, thank you willing to share! Greetings success of admin Percetakan Murah Rawamangun Jakarta Timur wish you deign to visit my website, thank you :)

I advise you to check https://writemyessay4me.org/blog/computer-science-career out if you want to know more about computer science career. It will help you to achieve success

Thanks for the best share and i loved it,
cinema hd for windows10

Delegates vs. Function Pointers, part 3, is really great and valuable article for all the new users to developing their high interest in that but there are also some very great opportunities available like the most beneficial essay writing services which is very essential in giving their best and desirable writing services in cheap rates.

Nice post. You work very well. We provide custom boxes at wholesale rate. You can visit our site and get more information.
Custom Hair Extension Boxes Packaging UK

Beds Online: Buy Beds Online in india at best price. Shop from Customhouzz the best bed offering a wide range of king size bed, queen size bed, double bed, single bed and many more collection.

Buy Sharara Suits online for women. Parchhai is offering latest design sharara suits online in India for ladies/women, our product are perfect combination of quality price, what are you waiting for shop with us today and grab the exciting deals on your favourite design suits.

great work. I would love to know more about that. Meanwhile android has made entertainement much easy like you can watch movies and tv shows anytime and anywhere on cinema hd apk. you can easily download cinema hd apk on any device. Even firestick supports cinema hd how to install cinema hd apk on firestick.
download cinema apk is probably the best movie app for android users.

Thanks for the best share and i loved it, 192.168.o.1

These things they still say on social networks yo whatsapp of https://yowaplus.net

Players contact the display screen to open a package deal and acquire a bonus payout. They could hold touching packages for extra bonuses till one package deal lastly reveals a "pooper," which ends the spherical. These bonus rounds helped video slots grow in popularity, but they don't seem to be} as prevalent right now, as recreation designers experiment with format. A generous welcome bonus is a should 온라인 카지노 for any respected online casino.

Great blog
Greeceassignmenthelp.com is a leading provider of online assignment help in Greece, catering to the needs of students from different academic backgrounds. Writers can provide you with customized solutions that meet your specific academic requirements.

Thanks for your beautiful content. I am enjoyed to read this information and learned a lot. Thank you so much for your good content.
proceso de divorcio de nueva jersey

A commotion was recently sparked by the disclosure of a Jetblue name change policy. The airline is implementing this adjustment as part of its effort to prioritise its consumers. They will be able to better communicate the company's principles and goals with this new name, and it will also be simpler for customers to discover them online. The airline is certain that the new logo will grow its client base and market share.

Turkish Airlines Panama Office: Improving Latin American Travel Experiences
Turkish Airlines, one of the top airlines in the world, is well known for its outstanding customer care, cutting-edge fleet, and large global network. The airline, which has a long history spanning more than 87 years, has constantly increased its reach to accommodate passengers from all over the world.

People mostly ask Where Does Emirates Fly in the US ? Emirates' hub is in Dubai, from whence it serves 161 destinations in 85 countries on six continents. In June 2004, Emirates launched non-stop passenger service from Dubai to New York JFK. Since then, it has expanded to Houston, Los Angeles, San Francisco, Dallas/Fort Worth, Seattle, Washington, DC, Boston, Chicago, Orlando, Newark, and Miami. Additionally, it flies to over 96 different destinations each week.

Modern amenities and facilities are available at the Modern amenities and facilities are available at theAvianca Airlines Miami Office to improve travellers' journeys. Modern technology is available at the airline's check-in desks, allowing for quick and effective check-in procedures. Additionally, passengers may take advantage of cosy seating areas and free Wi-Fi to keep connected as they wait for their flights. to improve travellers' journeys. Modern technology is available at the airline's check-in desks, allowing for quick and effective check-in procedures. Additionally, passengers may take advantage of cosy seating areas and free Wi-Fi to keep connected as they wait for their flights.

El al cancel flight can still happen, though, for a number of reasons. Travellers must be aware of their rights under El Al's cancellation policy, as well as their choices for obtaining compensation. Passengers may reduce the inconvenience brought on by flight cancellations and look forward to a suitable resolution offered by the airline by being informed of their rights and taking the necessary actions.

A hydraulic filter cart is a portable filtration system designed for maintaining the cleanliness of hydraulic fluids. It typically consists of a pump, motor, filter housing, hoses, and wheels for easy mobility. The filter cart is used to remove contaminants such as dirt, particles, and water from hydraulic fluids, ensuring optimal performance and extending the life of hydraulic systems and components.

AirlinesOffice is a comprehensive online platform that offers detailed information about Southwest Airlines Detroit Metropolitan Wayne County Airport Terminal (DTW)
. This specific terminal, located at Detroit Metropolitan Wayne County Airport in Michigan, serves as a key point of contact for passengers seeking assistance or information regarding Southwest Airlines' flights, services, and amenities at DTW. AirlinesOffice provides a user-friendly interface where travelers can find up-to-date details about the Southwest Airlines Detroit Metropolitan Wayne County Airport Terminal, including terminal facilities, check-in procedures, baggage services, and other relevant information. With the help of AirlinesOffice, passengers can navigate their journey through DTW smoothly, whether it's checking flight status, locating services, or obtaining general airport information related to Southwest Airlines.

Hlo Selena Gomeezz here, working for a travel agency. I've been there three years and know a lot about flights and airlines. I have a lot of information on Kuwait Airways New York office headquarters, so please visit my page and I hope I can help you.



Thank you for sharing. Marknjohson is an email support professional with expertise in AOL IMAP settings. He has in-depth knowledge of configuring email clients and troubleshooting common issues related to AOL email accounts. He is skilled in providing technical support to clients with an ability to effectively communicate complex technical solutions in simple terms.

We take pride in offering each traveller individualised help at the Garuda Airlines New York Office making sure that your journey starts smoothly and without effort. Our devoted staff of experts is knowledgeable with the complexities of foreign travel and is ready to help you with all of your flight questions, booking needs, and travel preparation.

Immerse yourself in a world of flavor with Kangvape Flavors 3000. This cutting-edge vaping device boasts an impressive selection of 3000 puffs worth of delectable e-liquid flavors. From classic blends to exotic concoctions, Kangvape Flavors 3000 offers an extended and satisfying vaping experience.

A salwar suit is a traditional ensemble worn by women of all ages and communities in India. A salwar suit mainly consists of a tunic, a pair of trousers and a dupatta. This suit is the best option to feel comfortable during more movements. Today, women wear different varieties of salwar kameez that are a blend of traditional and contemporary styles.

Order lowest price multiple sclerosis medicine from india visit denopsy 7mg teriflunomide tablet

Fellow travelers! If you're arriving at San Francisco International Airport (SFO) with Frontier Airlines, you'll be pleased to know that your journey concludes at the Frontier Arrival Terminal SFO. It's not just an endpoint; it's a place where your adventures find closure with a touch of convenience and warmth.

When cases proceed to court, traffic lawyers represent their clients, presenting arguments, cross-examining witnesses, and advocating for their rights before a judge or jury. Traffic Lawyer Henrico VA

air france terminal jfk
The Air France Terminal at JFK is equipped with modern facilities designed to enhance the passenger experience. From check-in counters to security checkpoints, travelers can expect efficiency and convenience at every step of their journey. The terminal also offers ample seating areas, dining options, and duty-free shopping for those looking to unwind or grab some last-minute essentials.

Bermuda Unicorn is the pepestart frosk nft for nft. With a wide variety of pepestart frosk nft to choose from, including sports cards, trading card games, and collectible cards, there's something for everyone on Bermuda Unicorn.

Website development is an essential part of any business, as the majority of clients (about 80%) are now found through various online channels and sources. In other words, not having a website is only viable for small businesses, in small communities, that are aiming for no more than a couple of dozen customers. Even so, such companies could still use their websites to jumpstart a rapid development process that would help them reach beyond their limitations, and so a business website is more or less a must for any company.

https://www.confiduss.com/en/services/corporate/online/web-development/


NFTs can grant access to exclusive digital experiences, memberships, or content, creating a sense of exclusivity and loyalty among customers or clients. Companies can leverage NFTs for gamification or collectibles in their products or pepestart frosk nft services, fostering customer engagement and loyalty. In industries like luxury goods and agriculture, NFTs can be used to track the provenance and authenticity of products, reducing the risk of counterfeiting. NFTs can be integrated into loyalty and rewards programs, allowing businesses to offer unique and tradable digital assets as incentives for customer loyalty.

Delegates are individuals chosen to represent a group or organization at conferences, meetings, or events. They act as official representatives and often participate in discussions, negotiations, and decision-making processes on behalf of their constituents. Delegates play a crucial role in facilitating communication and collaboration among different entities.
trucking accident lawyers near me

The welfare and security of animal companions while flying are guaranteed by British Airways Pet Policy. The airline aims to make pet travel as comfortable as possible since it recognises the value of pets as part of the family.

This comment has been removed by the author.

Goa honeymoon packages for 5 days with flight are carefully created to offer couples a vivid involvement with the sun-doused sentiment of this beachfront diamond. From the second you get onto the flight, your process unfurls into a whirlwind of sentiment, unwinding, and investigation. These extensive packages regularly include flight tickets, air terminal exchanges, comfortable convenience, and an organized itinerary that grandstands the best of Goa's sea facing resort in goa, noteworthy locales, and lively nightlife. Whether it's a walk around the sandy shores of Calangute or a light-lit dinner by the Middle Eastern Sea, each second is intended to make lasting recollections. For couples seeking a lengthy heartfelt retreat, Goa honeymoon packages for 5 days with flight give an optimal arrangement. These packages guarantee a seamless excursion, starting from your home city, and deal with an extensive itinerary that combines unwinding, investigation, and heartfelt encounters against the background of Goa's sun-kissed sea facing resort in goa,.

Alakhyog offers a transformative 200-hour Yoga Teacher Training (YTT) program in India. Immerse yourself in the ancient art of yoga while deepening your practice and gaining the skills to inspire others on their yoga journey. Led by experienced instructors, the comprehensive curriculum covers asanas, meditation, philosophy, anatomy, and teaching methodologies. The program, spanning 24 days, provides a holistic approach to yoga, fostering personal growth and building a strong foundation for teaching. Nestled in the spiritual heart of India, Alakhyog provides a supportive and authentic environment for your yoga education, ensuring a life-changing experience in the birthplace of yoga.
https://www.alakhyog.com/200-hour-yoga-teacher-training-rishikesh-india/

Disposable Vape | Best Disposable Pens UK | VapeUnit
VapeUnit offers the best disposable vape pens in the UK. Our selection of disposable vape pens ensures a convenient and hassle-free vaping experience. Explore our range of high-quality disposable pens for a satisfying and flavorful vape. Whether you're a beginner or an experienced vaper, VapeUnit provides reliable and easy-to-use options. Enjoy the freedom of vaping without the commitment of rechargeable devices. Choose VapeUnit for the best disposable vape pens in the UK.

I just wanted to express my heartfelt appreciation and gratitude. Thank you for your kindness and support. dui lawyer king George VA

Salutations Hello, my name is Ninaa Debrov, and I found your post to be really intriguing. You can visit my page for more information about upgrading to mint on jetblue . Since most people ask this issue, I have some information that will be very helpful to you.

This blog's major focus is how to modify your Sun country change flight , along with information on other subjects including the airline's change fee policy. This blog is therefore a clear and well-organized resource for information on Sun Country's flight change procedure and policy.

Nexus UPS Systems stands as a leading manufacturer of online UPS Delhi systems in India, dedicated to addressing energy disruption challenges. Our comprehensive range of UPS products is designed to safeguard critical data and network connections against potentially harmful power surges and spikes. With a diverse array of UPS solutions, Nexus is committed to meeting the unique needs of our customers.

Cathay pacific cancellation fee is intended to accommodate modifications to the itinerary. In the event that cancellation is necessary due to unforeseen circumstances, travelers should be informed of the related costs. Being aware of these costs enables tourists to make wise choices. In an effort to maintain transparency, Cathay Pacific makes sure that travelers are informed of the expenses related to cancellations.

From the bustling streets of Beirut, and keserwan to the serene landscapes of the countryside, apartments for rent keserwan offers an array of opportunities for investors, homeowners, and those seeking their own slice of Lebanese paradise.

Whether you're seeking securities-based lending or wealth management company singapore , Astor Wealth Group offers a comprehensive suite of financial services to meet your investment objectives.

Download HAWA Whatsapp from here

Individuals facing DUI charges can navigate the legal system with confidence, knowing they have a dedicated legal advocate working tirelessly to protect their rights and achieve the best possible outcome for their case. DUI lawyers in Arlington

Hey Your website contains such useful information. Appreciate your written skills and your blog. If you want to know about sun country airlines cancellation policy then visit our website.

If you're facing a legal issues in virginia, don't hesitate to seek the assistance of a qualified lawyer. with their experties and dedication, you van navigate the legal process with confidence, knowing that your rights and interests are in capablehands. abogado dui virginia

Great explanation of how delegates in C# 1.0 work, especially with state management! The example with `GreaterThan` really clarifies how context is bundled with function pointers. Looking forward to the next part on C# 2.0+ features!
Contested Divorce New York State

Discover the legal ramifications of being charged with indecent liberty minor charge. Explore the potential consequences, including criminal penalties and the impact on one's future, as well as the importance of legal representation in such cases.

Finding a reliable family lawyer near me has made all the difference during this challenging time. They offer invaluable advice and support, ensuring that my rights and interests are protected throughout the process. If you need legal assistance, don’t hesitate to reach out to a professional.

Great post! I’ve been researching the Best Auto Level Brand for my upcoming construction project, and your insights are incredibly helpful. From my experience, brands like Leica and Topcon consistently come out on top for their precision and durability. Their auto levels offer excellent performance even in challenging conditions, which is crucial for accurate measurements.

Great explanation of delegates vs. function pointers—your insights make a complex topic much clearer!
Mount Everest Base Camp Trek
Sandakphu Trek Package/a>

Delegates provides expert guidance and exceptional service for organizing and managing events. Their attention to detail and seamless execution ensure that every event is a success. Clarke va traffic lawyer

Post a Comment