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Sometimes you will create a class that you want to be able to freely mix in an expression with other types of data While overloaded operator functions can provide a means of mixing types, sometimes a simple conversion is all that you want In these cases, you can use a type conversion function to convert your class into a type compatible with that of the rest of the expression The general form of a type conversion function is operator type ( ) {return value ;} Here, type is the target type that you are converting your class to and value is the value of the class after conversion A conversion function must be a member of the class for which it is defined To illustrate how to create a conversion function, let s use the three_d class once again Suppose you want to be able to convert an object of type three_d into an integer so that it can be used in an integer expression Further, the conversion will take place by using the product of the three dimensions To accomplish this, you use a conversion function that looks like this:

DISPLAYING PIXEL DATA The PixelDlg form is another area where the behavior in our MDI application is not quite as desired. Right now each child has a separate pixel dialog, and these dialogs are separate from the parent form. To integrate this feature with our MDI application, it would be nice if a single PixelDlg was used for all album windows, and if this dialog was an MDI child form as well. We would also like to preserve our ability to run the MyPhotos application as an SDI where only a single album is displayed at a time. This section will make the changes in our code required by these features, the result of which appears in figure 16.7. These changes will involve the following tasks: Create a global PixelDlg instance that can be shared by all MainForm instances. Provide a means to display this dialog as an MDI child form. Access this global instance from the MainForm class instances. Ensure this dialog is always associated with any active MainForm window.

operator int() { return x * y * z; }

Figure 16.7 The PixelDlg form in this figure is partially obscured to prove that it really is a child form in our MDI application, rather than the modeless dialog originally created in chapter 8.

j RFC 2396: Uniform Resource Identifiers (URI): Generic Syntax j RFC 2246: The TLS Protocol Version 10

Here is a program that illustrates how the conversion function works:

#include <iostream> using namespace std; class three_d { int x, y, z; // 3-d coordinates public: three_d(int a, int b, int c) { x=a; y=b, z=c; }

This may seem like a daunting task for a single section. In fact, our application is well-prepared for these changes. Pulling out my soap box for a moment, the real test

26:

(GEM102), including GEM 102 Errata 1 - TM3443r3 ETSI TS 101 812 V131: Digital Video Broadcasting (DVB); Multimedia Home Platform (MHP) Specification 103, including MHP Specification Version 103 errata #2 HAVi 11 (HAVi v11 8, 15-May-2001; HAVi v11 Java L2 APIs, 15-May-2001; HAVi v11 7,15-May-2001) JSR 36: Connected Device Configuration 10b [included in JSR 129] JSR 46: Foundation Profile 10b JSR 129: Personal Basis Profile 10b JSR 217: Personal Basis Profile 11 JSR 218: Connected Device Configuration (CDC) 11 JSR 927: Java TV(tm) API 11 JAR File Specification: Sun Microsystems, version 15

of an architecture is not its ability to work as designed, but rather its ability to perform tasks for which it was not designed. The coding techniques we have used throughout the book are useful in any application to accommodate future requirements. These techniques include frequent encapsulation of tasks into separate methods; sketching a user interface design or enumerating the steps required before writing any code; and building reusable libraries and methods where possible. As a result, our code has some advantages for new changes such as this in that we have consistently tried to use good coding practices and not duplicate our tasks in multiple places. While perhaps not always successful, I believe we have done a reasonable job. In the PixelDlg form, for example, we were careful to only update this form in the UpdatePixelData method of the MainForm class. Similarly, the only location where the PixelDlg form is created right now is in the Click event handler for the menuPixelData object. Such organization occasionally requires a little extra work, or in our case a few more pages, but this effort often pays off as the code is maintained and updated in the future. Stepping off my soap box and returning to the topic at hand, we will make our changes in the order shown in the previous list, beginning with a global PixelDlg instance. For this we will provide a static property in the PixelDlg class that returns a shared form.