Understanding Delphi Class (and Record) Helpers

Understanding Delphi Class (and Record) Helpers A feature of the Delphi language added some years ago (way back in in Delphi 2005) called Class Helpers is designed to let you add new functionality to an existing class (or a record) by introducing new methods to the class (record). Below youll see some more ideas for class helpers learn when to and when not to use class helpers. Class Helper For... In simple words, a class helper is a construct that extends a class by introducing new methods in the helper class. A class helper allows you to extend existing class without actually modifying it or inheriting from it. To extend the VCLs TStrings class you would declare and implement a class helper like the following: type TStringsHelper class helper for TStrings public function Contains(const aString : string) : boolean; end; The above class, called TStringsHelper is a class helper for the TStrings type. Note that TStrings is defined in the Classes.pas, a unit that is by default available in the uses clause for any Delphi forms unit, for example. The function were adding to the TStrings type using our class helper is Contains. The implementation could look like: function TStringsHelper.Contains(const aString: string): boolean; begin result : -1 IndexOf(aString); end; Im certain youve used the above many times in your code - to check if some TStrings descendant, like TStringList, has some string value in its Items collection. Note that, for example, the Items property of a TComboBox or a TListBox is of the TStrings type. Having the TStringsHelper implemented, and a list box on a form (named ListBox1), you can now check if some string is a part of the list box Items property by using: if ListBox1.Items.Contains(some string) then ... Class Helpers Go and NoGo The implementation of class helpers has some positive and some (you might think of) negative impacts to your coding. In general you should avoid extending your own classes - as if you need to add some new functionality to your own custom classes - add the new stuff in the class implementation directly - not using a class helper. Class helpers are therefore more designed to extend a class when you cannot (or do not need to) rely on normal class inheritance and interface implementations. A class helper cannot declare instance data, like new private fields (or properties that would read/write such fields). Adding new class fields is allowed. A class helper can add new methods (function, procedure). Before Delphi XE3 you could only extend classes and records - complex types. From Delphi XE 3 release you can also extend simple types like integer or string or TDateTime, and have construct like: var s : string; begin s : Delphi XE3 helpers; s : s.UpperCase.Reverse; end; Ill write about Delphi XE 3 simple type helper in the near future. Wheres MY Class Helper One limitation to using class helpers that might help you shoot yourself in the foot is the fact that you can define and associate multiple helpers with a single type. However, only zero or one helper applies in any specific location in source code. The helper defined in the nearest scope will apply. Class or record helper scope is determined in the normal Delphi fashion (for example, right to left in the units uses clause). What this means is that you might define two TStringsHelper class helpers in two different units but only one will apply when actually used! If a class helper is not defined in the unit where you use its introduced methods - which in most cases will be so, you do not know what class helper implementation you would actually be using. Two class helpers for TStrings, named differently or residing in different units might have different implementation for the Contains method in the above example. Use Or Not? Yes, but be aware of the possible side effects. Heres another handy extension to the above mentioned TStringsHelper class helper TStringsHelper class helper for TStrings private function GetTheObject(const aString: string): TObject; procedure SetTheObject(const aString: string; const Value: TObject); public property ObjectFor[const aString : string]: TObject read GetTheObject write SetTheObject; end; ... function TStringsHelper.GetTheObject(const aString: string): TObject; var idx : integer; begin result : nil; idx : IndexOf(aString); if idx -1 then result : Objects[idx]; end; procedure TStringsHelper.SetTheObject(const aString: string; const Value: TObject); var idx : integer; begin idx : IndexOf(aString); if idx -1 then Objects[idx] : Value; end; If youve been adding objects to a string list, you can guess when to use the above handy helper property.

Pulp Fiction Review Research Paper Example | Topics and Well Written Essays - 1250 words

Pulp Fiction Review - Research Paper Example Tarantino’s application of style in the Pulp Fiction is a representation of emerging approaches. It is centered on a movie context rather than real life. The use of alteration and paradox gives new energy to the film and gives its audience a new experience. The infamous Pulp Fiction is a tale of a number of connected lives of two men who make a living from killing, a boxer who is aging, a mob boss, accompanied with his wife. The story revolves around the lives of these individuals as they experience a number of unsettling, intense, memorable, comic and emotional situations. In a review of the film, Ebert Roger describes it as being a comic film that revolves around drugs, violence, blood, unusual sex, dead bodies and other graphic details. The plot of events and the theme of the film seem to be strange. Tarantino matures every scene sufficiently by the use of a variety of cinematic aspects, which transforms the film into an iconic and a memorable masterpiece (LoBrutto, 76). Ta rantino applies cinematography, editing, affectivity of sound and mise-en-scene to warn the audience of any events transitioning, introduce scenes, enlighten the audience hidden traits about the characters and enhance anticipation while maintaining suspense. This is evident in a scene where Vincent has to pick up Mia from Wallace’s house for the night. The scene commences with a tracking shot of him making his way to the front door in which his body forms a silhouette in the front door. The cameras capture for a brief moment the note that has been taped to the door and then make a zoom in on the note. The interests of the audience are maintained by the shift to Mia’s voice which narrates the note and this explains the content to the audience. Vincent enters the door and Tarantino’s expertise when it comes to mise-en-scence becomes apparent (Jewers, 99). The effect that immediately captures the eye is the color scheme of the house. Almost every item is white in c olor, which the inclusion of the couch, carpets, walls, lamps to even the shirt that Mia is wearing. For the enhancement of the white color scheme, key front lighting is used in the scene. This color also adds irony to the film since white in often linked to purity, yet the inhabitants of the house are far from innocent. One addicted to crack while the other is a mob boss. Juxtaposition is also introduced with regard to the fact that Vincent is wearing a black suit yet the rest of the house is white in color. Analysts may suggest that this is a premonition that he has no place in the house and that bad misfortune will befall him if he stays in the house. The house has also been designed to appear to be very modern since various forms of modern technologies have been incorporated into the house such as cameras that are able to watch over the main rooms (Polan, 133). While Vincent if unaware that he is being watched by Mia through a camera viewing station, he walks around the house at ease. To maintain the entertainment value of such a scene, Tarantino makes use of non-dietetic sound, despite the fact that it was coming from the record player, but the audience is not aware of that aspect until the end of the scene. The song is about a about a girl that is in love with the son of the

Why I want to study fashion design Essay Example | Topics and Well Written Essays - 500 words

Why I want to study fashion design - Essay Example This is one area that really helps me to exploit my creative urges and gives a huge satisfaction when my designs are liked by people. I have therefore decided to go for professional degree in fashion designing so that I could further explore the intricacy of the business. I believe that the degree from this college would help me to grow not only as a person but also as a professional who would be able to meet the challenges of the contemporary world. My family and friends have been the major motivating force. My passion of ethnic design and use of fusion technique in my design is my strongest point. As a child I was much enamored with the fashion magazines which use to showcase the clothes of leading fashion designers of Milan and Paris. As I grew up, I realized that while I am fascinated with the contemporary fashion designers, I am equally amazed at the variety of ethnic designs across the culture, color and nationality. The multicultural society therefore has been a very vital par t of my creativity which I believe needs to be used for exploiting my potential as a designer. In the contemporary environment of globalization, the professional degree in fashion designing would equip me with wider options to expertly exploit the opportunities and help gain a competitive advantage within the fashion industry.

Definition of Politics Essay Example for Free

Definition of Politics Essay The art and science of government; dealing with the form, organisation and administration of a state or part of one, and of the regulation of its relations with other statespolitical [means] belonging to or pertaining to the state, its government and policy. Oxford English Dictionary. There are two types of political systems, the Centralised political system, and the Decentralised political system. The centralised political system is a means to run the country under central control, with no local authorities creating rules and regulations for a specific area, an example of this is the former Soviet Union, or modern China. This ruling is known as communism. Sports in communist countries are controlled in the same way as any other social agencies, such as education. Sport was used for boosting morale, production, and effectiveness of the military and to provide a successful image for their regime around the world. The athletes of the communist bloc regimes dominated world sport for many years until the cold war ended. A decentralised political system is one where the administration of government is re-organised into smaller autonomous units such as local authorities in the UK and individual states in the USA. Each area decides its own policies on sport provision and effectiveness of sport in schools. Many sports people see sport as a means of escaping every day life, which is controlled by the government and do not which to see sport controlled except by their own governing, bodies e.g. IOC, FIFA. However, government influence cannot be avoided in some circumstances. Sport has been used for government propaganda purposes, for example the Nazi propaganda in the 1936 Olympic Games, which Hitler used to promote his Nazi ideals. In Russia, the government insisted that a fitness campaign called Ready for labour and defence was compulsory for all its citizens and was still operational in the latter half of the 20th century. In our own country, following heavy losses in the Boer war, it was felt that the military was not fit enough and so compulsory fitness exercises was instigated in all state schools in the early 20th century to improve the fitness of the working class. More recently, we can see how politics and sport cannot be separated when the English cricket team pulled out of a group match due to political unrest between Zimbabwe and England. Sport can be used to introduce or reinforce social harmony. By introducing good sporting facilities into areas that have suffered unrest, the government hopes to lure youths to use the facilities wisely in their spare time rather than be involved in anti-social behaviour. The governments Education Act of 1988 affected the provision of sport in schools. The conservative government wanted more control over the teaching of physical education in schools and produced a report called Raising the game.  In reality, sport needs politics as much as politics needs sport. For example, the government can provide finance and locations to stage major sporting events such as the Olympics and the World Cup. In return, sporting teams who perform well promote a country to the rest of the world, and raises national pride. All beneficial to any government. Drugs have been used throughout history, since the time of the Greeks and Romans who took substances to improve their performance and so it is not a modern problem. However, drug use in modern sport has become more widespread, and is now shown to be a problem across all the sports and in both genders, at both amateur and professional levels. An increase in drug use came about through various factors such as advances in biology and medicine, the use of drugs in WW2, the development, and availability of testosterone steroids and growth hormones in the 1950s. Weight trainers saw the potential of these drugs and used them to their own advantage and other athletes were able to see the potential of using drugs to improve their own play e.g. snooker players used beta-blockers to steady nerves.

Graduation Speech :: Graduation Speech, Commencement Address

I want all of you graduates to do me a favor and just look around at your fellow classmates for a few seconds and think about the people you know out there and realize: After all of the parties and once all of the euphoria surrounding graduating has subsided, you are not going to see many of these people ever again. I'm sure it's a comforting though to many of you that you will never see me again, and I've come to terms with that. We are all headed in different directions now. Some of us are going to college, whether it be two-year, four-year, in-state, out-of-state, or whatever. Some are going straight into the workforce, maybe in construction, plumbing, commercial fossil fuel distribution or as Jeff Reynolds puts it so eloquently, "You could go into a life of being a government financial allocation specialist." And some of you are going straight to jail. Right now I'm sure many of you are sitting there with thoughts racing through your head at a mile a minute. Some people are anxious about the future, others are primed to get on the bus for the after-grad party. Some are thinking that they finally have their ticket stamped to leave Purple Lake, which I happen to be thinking right now. Some of you are looking at the clock and wondering how long it will be until I shut-up and get off the stage, I happen to know Goset is thinkin' that right now, aren't you Aynsley? Those kids, like Goset over there, just want their little case which actually doesn't contain a diploma, instead it just has a piece of paper which tells you when to pick it up. To those people out there I say, "Just cool off, I'll be done in a minute, the diploma cases aren't going anywhere, so just be patient!" Though you might not be thinking any of those things right now, I'm sure we are all thinking that we finally made it. Yup, high school is over, but we're not even close to being done. This is just the beginning of the rest of our life and it only gets harder from this point on. You will encounter obstacles at every turn, but you must persevere if you hope to succeed in this world. The key to your success will be to know what everyone expects from you and then you must commit yourself to exceeding those expectations, that is what will set you ahead of the rest.

Research Reflection

If I had one Job to choose in this world it would be a veterinarian specializing in equine. When I was little this was what I knew I wanted to grow up and do, even knowing I would have to go to school for what seemed to be forever to receive my doctorate. Since before I was walking I was riding horses, which lead into the rodeo route when I turned eleven and was the main focus point my whole life and if there's passion I had, it was rodeo.The environment and passion rodeo provided me made me want to become a vet so much more; I wanted to know everything possible. When I was about sixteen is when I realized how much I wanted to pursue being a veterinarian. I was on the rodeo road hard core at this point in my life, it even took me out of normal high school to be home schooled while on the road. My main horse was getting hurt on a regular basis which led me to develop a close relationship with a vet who was an equine specialist.When you're a vet you can work for yourself and if it is s omething you enjoy and want to have the knowledge and willingness to learn, you will be successful by the knowledge and the fact that people will trust you with their animals that they hold lose to their hearts. The hours may be long and tiring but when you enjoy your work the hours don't seem as long as they are. When someone puts their trust into you, you appreciate that and don't want to let them down. Its not Just an animal to people, it's like a child and for some people they can have up to half a million dollars invested.The work environment is so amazing as you are inside and outside helping what you love, for me its horses. When you walk into the office to advise you're there for your appointment your greeting with smiling faces to make you comfortable owing you're in good hands. You have places to unload and place your horses while your waiting so they are not uncomfortable if they are in pain or sick. My goals in this role of life would first to be to finish school top in the class showing the knowledge and education provided to me.I would want to have an internship with a well-known and trusted equine vet to establish and create the knowledge of someone who has been in the business and established. I would want to open my own business after I have created a small knowledge for the customers for myself. Once my business was opened I would want to have another veterinarian on board to handle the over boarding of many customers and emergency services for patients. I would want to create and share knowledge with customers and establish for the long run of the work place.I would want to be trusted and a well-known place to go when you're in need of any help with your equine. My interest were much conformed into a lot of different major categories, unfortunately my dream Job of a veterinarian was not on there. The closest thing to my interest would be animal caretaker. With my dream major not being listed, it Just wows me that my interest are more geared to creating of animals. The education level needed for an animal caretaker is only a high school diploma and previous work experience. The annual salary is only about $21 ,OHO.O which is another reason to me that sometimes the things you enjoy Just are not good ideas for the economy the way it is. Currently before completing my education that is less than half of my annual salary. My prior knowledge I was very well aware that unless you can struggle, or make it through school you cannot follow your heart to a small time Job that satisfied our needs; when it is that situation makes that your hobby not career. Parker, Heather M. â€Å"CUFF. Org – Interest Profiler. † CUFF. Org – Interest Profiler. College Foundation, 14 July 2014. Web. 4 July 2014 My dream Job of a vet compared to an animal caretaker differs in a few different ways from the salary to structure. The salaries vary greatly from a five figure annual salary to up to six. The Job satisfaction would be t he same but as an animal caretaker you will not be able to provide care to heal or verify an illness. You will not have the same petition and the status in the community of the equine world; more of a barn hand to the owner on the supply chain. As a vet you have the same legal liabilities as a doctor with humans, you have to care and be passionate.Ethical values are a moral code each of us has grown into as a personality; it has become part of you good or bad. The NAVA has established a set of principles and they are available online as well, they are well rounded values everyone should stand up to. You never want to portray unprofessional; you want to uphold your profession. You want to treat your customers as if you wanted to be rated. You never want to take advantage of them or withhold the truth or information. You are resuming the obligation of your clients to make decisions for the health of the animal.The purpose of ethical codes is to ensure that everyone is getting treated fairly and the same, with respect. If you go to the doctor and they diagnose you with this terminal illness or something serious, you believe them and take them serious. The question comes in if you go through a lot of test and understanding to only find out that you have wasted your money because there is nothing really wrong with you. That would upset anyone, even to be glad to know you're okay but you have been betrayed by someone you have trusted that's not ethical or morally right.There are many consequences from actions from you performing unethical acts, you can never gain the trust of clients and create new customer relationships. As I stated earlier you want to establish a great patient and client base, they need to trust you and understand that you're going to help; without that you may never make it in your profession. They can also range to legal issues; it is illegal to perform necessary medical acts without the patient and client understanding consent.Acting ethically is something that should be a natural act for you, as when you were a kid treats others how you would like to be treated. If you're in the medical field think that you want your doctor to treat your mother how he/she would treat their mother. Same thing applies in the veterinarian world; there is a lot of investment and love in an animal like a child. If you are in it for the money or position on the pole of hierarchy your already thinking unethically. When it comes to the care and health of there and others loved ones you should naturally want the best.

What Causes the Aurora Borealis Colors

The Aurora is the name given to the  bands of colored lights seen in the sky at the higher latitudes. The aurora borealis or Northern Lights are seen mainly near the Arctic Circle. The aurora australis or Southern Lights are seen in the southern hemisphere. The light you see comes from photons released by oxygen and nitrogen in the upper atmosphere. Energetic particles from the solar wind strike  the layer of the atmosphere called the ionosphere, ionizing the atoms and molecules. When the ions return to the ground state, energy released as light produces the aurora. Each element releases specific wavelengths, so the colors you see depend on the type of atom that is excited, how much energy it received, and how the wavelengths of light blend with each other. Scattered light from the sun and moon may affect the colors, too. Aurora Colored From Top to Bottom You can see a solid-colored aurora, but its possible to get a rainbow-like effect through the bands. Scattered light from the sun can impart a violet or purple to the top of an aurora. Next, there may be red light atop a green or yellow-green band. There may be blue with the green or below it. The base of the aurora may be pink. Solid Colored Aurora Solid green and solid red auroras have been seen. Green is common at the upper latitudes, while red is rare. On the other hand, Aurora viewed from the lower latitudes tend to be red. Element Emission Colors Oxygen: The big player in the aurora is oxygen. Oxygen is responsible for the vivid green (wavelength of 557.7 nm)  and also for a deep brownish red (wavelength of 630.0 nm). Pure green and greenish yellow aurorae result from excitation of oxygen.Nitrogen: Nitrogen emits blue (multiple wavelengths)  and red light.Other Gases:  Other gases in the atmosphere become excited and emit light, although the wavelengths may be outside of the range of human vision or else too faint to see. Hydrogen and helium, for example, emit blue and purple. Although our eyes cant see all of these colors, photographic film and digital cameras often record a broader range of hues. Aurora Colors According to Altitude Above 150 miles —  red  Ã¢â‚¬â€Ã‚  oxygenUp to 150 miles  Ã¢â‚¬â€ green  Ã¢â‚¬â€ oxygenAbove 60 miles  Ã¢â‚¬â€ purple or violet — nitrogenUp to 60 miles  Ã¢â‚¬â€ blue  Ã¢â‚¬â€ nitrogen Black Aurora Sometimes there are black bands in an aurora. The black region can have structure and block out starlight, so they appear to have substance. The black aurora most likely results from electric fields in the upper atmosphere that prevent electrons from interacting with gases. Aurora on other Planets The Earth is not the only planet that has aurorae. Astronomers have photographed the aurora on Jupiter, Saturn, and Io, for example. However, the colors of the aurora are different on different worlds because the atmosphere is different. The only requirement for a planet or moon to have an aurora is that it have an atmosphere that is bombarded by energetic particles. The Aurora will have an oval shape at both poles if the planet has a magnetic field. Planets without magnetic fields still have an Aurora, but it will be irregularly shaped.