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# let polyfunc x = match x with Some m -> m | None -> raise Not_found;; val polyfunc : 'a option -> 'a = <fun> # polyfunc (Some 10);; - : int = 10 # polyfunc (Some "hello");; - : string = "hello" # polyfunc (Some 10.0);; - : float = 10. # class nonpoly = object method polyfunc x = match x with Some m -> m | None -> raise Not_found end;; Characters 5-110: ..... nonpoly = object method polyfunc x = match x with Some m -> m | None -> raise Not_found end.. Some type variables are unbound in this type: class nonpoly : object method polyfunc : 'a option -> 'a end The method polyfunc has type 'a option -> 'a where 'a is unbound # The error message says some type variables are unbound because classes and objects do not escape the type checker. All the type information about a class must be known at compile time, including the methods and data members. Classes can be polymorphic (via parameterization), which is how you can have methods that operate on known types and be (effectively) polymorphic. This topic is discussed in detail later in the chapter, although you can see a quick example following (implementing correctly the preceding example that failed). # class ['a] polyclass = object method polyfunc (x: 'a option) = match x with Some m -> m | None -> raise Not_found end;; class ['a] polyclass : object method polyfunc : 'a option -> 'a end When you use this new class in the toplevel, it does not become concrete until you use it on a defined type. After that, it is concrete and can be used only on that type. In compiled code, the type inference occurs automatically.

Cascading Style Sheets, in general, define how HTML should be displayed. However, there are things that you can do in styles that cannot be accomplished in hypertext markup: display hyperlinks with no underline, create scrollable content regions, implement custom graphics for your list items, and so much more.

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This function scrolls the label from right to left. Once the ticker has completely scrolled off the left edge, the function resets it back to the right side of the screen. The 3-pixel-per-call move is arbitrary, so feel free to change that amount if you would like a faster or slower ticker. You can also change the frequency of the timer call in the initialize function, which would result in the scroll_label function being called less often. However, if the function is called too infrequently, the scrolling motion will be jerky. The ticker will scroll completely off the screen before being reset to the right side of the screen. This means that there will be a short period when only a relatively small percentage of the label is visible. If you would like, you can modify the ticker to constantly fill the screen by using two labels (for the sake of this example, that s more complexity for relatively little gain). And if you would prefer a right-to-left scrolling ticker, the following replacement method does just that:

# let np = new polyclass;; val np : '_a polyclass = <obj> # np#polyfunc (Some 10);; - : int = 10 # np;; - : int polyclass = <obj> #

So what exactly is a style It is coding that you apply to HTML, either inline within the HTML tags or externally (as we ll discuss momentarily). If we want to accomplish the previous task of modifying our <h1> tag to reflect italics as well as a grayed color, we can use the style attribute: <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>CSS Comparison</title> </head> <body> <form id="form1"> <h1>Heading 1 - No Formatting</h1> <h1 style="font-style: italic; color: Gray;">Heading 1 - With Style</h1> </form> </body> </html> When this is run in a browser, you ll find that the <h1> tag has been modified to reflect the desired changes, as shown in Figure 6-2.

def scroll_label if(@tickerlabel.x > @main_window.width) @tickerlabel.move(-@tickerlabel.width , @tickerlabel.y) else @tickerlabel.move(@tickerlabel.x + 3, @tickerlabel.y) end end

In OCaml, objects can be created directly (they are called direct objects in the OCaml documentation). This direction creation is often referred to as duck typing (a play on the phrase if it walks like a duck and quacks like a duck, it is a duck ). Although direct objects do not have to be classes or need to be instantiated, there are some restrictions. One of the most prominent restrictions on direct objects is that they cannot be inherited from. Direct objects can be useful for prototyping. In fact, there are programming languages (often called prototyping languages) that support direct-object creation to achieve the ability to rapidly prototype objects and types. Direct objects (sometimes called immediate objects) can be defined anywhere. Unlike classes, direct objects can be created inside of other functions and methods. Direct objects support everything else that classes do. In fact, a direct object that takes arguments can even be thought of as an object factory. One concrete benefit of using immediate objects is that they can be used in situations in which classes cannot be used. An example is when the self type might escape the class in which it is being used, which can happen when using a class to update a reference. let living_objects = ref val living_objects : '_a # class myobject = object(self) method register_object = method unregister_object end;; Characters 79-83: method register_object = [];; list ref = {contents = []}

Next, the get_label_text function takes the list of stock symbols and gets a price for each of them:

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