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Whenever we have written a function so far, we've known the types of the function's parameters and return value This knowledge may seem at first like an integral part of any function's description Nonetheless, a closer look will reveal that we have already used but not written functions with argument and return types that we do not know until we use the functions For example, in 613/107, we used a library function named find, which takes two iterators and a value as arguments We can use the same find function to find values of any appropriate type in any kind of container This usage implies that we do not know what find's argument or result types will be until we use it Such a function is called a generic function, and the ability to use and create generic functions is a key feature of the C++ language The language support for generic functions is not hard to understand What is difficult is understanding exactly what we mean when we say that find can accept arguments of "any appropriate type" For example, how can we describe how find behaves in a way that will enable someone who wishes to use it to know whether it will work with particular arguments The answer to this question lies partly within the C++ language and partly outside it The part that is inside the language is the idea that the ways in which a function uses a parameter of unknown type constrain that parameter's type For example, if a function has parameters x and y, and computes x + y, then the mere existence of that computation implicitly requires that x and y have types for which x + y is defined Whenever you call such a function, the implementation checks that your arguments' types meet the constraints implied by the ways in which the function uses its parameters The part of the answer that lies outside the C++ language is the way in which the standard library organizes the constraints on its functions' parameters We have already shown you one example of this organization namely, the notion of an iterator Some types are iterators; others aren't The find function takes three arguments, of which the first two are required to be iterators When we say that a particular type is an iterator, we are really saying something about the operations that the type supports: A type is an iterator if and only if it supports a particular collection of operations in a particular way If we were to set out to write the find function ourselves, we would do so in a way that relies only on the operations that every iterator must support If we were to write our own container as we shall do in 11 then we would have to supply iterators that support all the appropriate operations The notion of an iterator is not part of the C++ language proper However, it is a fundamental part of the standard library's organization, and it is that part that makes generic functions as useful as they are This chapter shows some examples of how the library might implement generic functions Along the way, it explains just what an iterator is or,.

Other key binding attributes that are not used in the Favorites example include: locale An optional attribute indicating that the key binding is only defined for a specified locale Locales are specified according to the format declared in javautilLocale platform An optional attribute indicating that the key binding is only defined for the specified platform The possible values of the platform attribute are the set of the possible values returned by orgeclipse swtSWTgetPlatform()

An Eclipse action is composed of several parts, including the XML declaration of the action in the plug-in s manifest, the IAction object instantiated by the Eclipse UI to represent the action, and the IActionDelegate defined in the plug-in library containing the code to perform the action (see Figure 6 9)

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We said in 102/176 that a string literal is just a convenient way of writing the address of the initial character of a null-terminated sequence of characters We said in 1016/176 that we can initialize the elements of an array by giving a sequence of appropriate values, enclosed in curly braces, as an initializer By combining these two facts, we learn that we can initialize an array of character pointers by giving a sequence of string literals This claim is quite a mouthful To make it concrete, suppose that we wish to convert numeric grades to letter grades according to the following rule:

This separation of the IAction object, defined and instantiated by the Eclipse user interface based on the plug-in s manifest and the IActionDelegate defined in the plug-in s library, allows Eclipse to represent the action in a menu or toolbar without loading the plug-in that contains the operation until the user selects a specific menu item or clicks on the toolbar Again, this approach represents one of the overarching themes of Eclipse: lazy plug-in initialization

IActionDelegate2 Provides lifecycle events to action delegates; if you are implementing IActionDelegate and need additional information,

If the grade is at least then the letter grade is 97 A+ 94 A 90 A87 B+ 84 B 80 B77 C+ 74 C 70 C60 D 0 F

Suppose you want to print out all of the elements in an array Many programmers use a for loop, but there's no need if you use the following idiom:

such as when to clean up before the action delegate is disposed, then implement IActionDelegate2 instead In addition, an action delegate implementing IActionDelegate2 will have runWithEvent(IAction, Event) called instead of run(IAction)

Here is a program that does the conversion:

IEditorActionDelegate Provides lifecycle events to action delegates associated with an editor (see Section 693, IEditorActionDelegate, on page 279) IObjectActionDelegate Provides lifecycle events to action delegates associated with a context menu (see Section 673, IObjectActionDelegate, on page 266) IViewActionDelegate Provides lifecycle events to action delegates associated with a view (see Section 683, IViewActionDelegate, on page 273) IWorkbenchWindowActionDelegate Provides lifecycle events to action delegates associated with the workbench window menu bar or toolbar

Where and when an action appears is dependent on the extension point and filter used to define the action This section discusses adding a new menu to the workbench menu bar and a new button to the workbench toolbar using the orgeclipseuiactionSets extension point (see Figure 6 9) These actions are very similar to menu contributions with a locationURI id (see Section 629, locationURI, on page 230) equal to orgeclipseuimainmenu Both the menu item and toolbar button open the Favorites view when selected by a user The user can already open the Favorites view (as outlined in Section 25, Installing and Running the Product, on page 92) but a top-level menu will really show off the new product by providing an easy way to find it

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