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13. Unusual Data Types
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Non-Parallel Use of Complex Data event = EventQueue[ queueFront ] event = EventQueue[ queueBack ] AddEvent( event ) eventCount = eventCount - 1
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Parallel Use of Complex Data event = HighestPriorityEvent() event = LowestPriorityEvent() AddEvent( event ) RemoveEvent( event )
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Although you might think that these guidelines apply only to large programs, access routines have shown themselves to be a productive way of avoiding the problems of global data. As a bonus, they make the code more readable and add flexibility.
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How to Reduce the Risks of Using Global Data
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In most instances, global data is really class data for a class that hasn t been designed or implemented very well. In a few instances, data really does need to be global, but accesses to it can be wrapped with access routines to minimize potential problems. In a tiny number of remaining instances, you really do need to use global data. In those cases, you might think of following the guidelines in this section as getting shots so that you can drink the water when you travel to a foreign country: They re kind of painful, but they improve the odds of staying healthy.
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conventions for global variables, see Identify global 3 variables in Section 11.4.
Develop a naming convention that makes global variables obvious You can avoid some mistakes just by making it obvious that you re working with global data. If you re using global variables for more than one purpose (for example, as variables and as substitutes for named constants), make sure your naming convention differentiates among the types of uses. Create a well-annotated list of all your global variables Once your naming convention indicates that a variable is global, it s helpful to indicate what the variable does. A list of global variables is one of the most useful tools that someone working with your program can have. Don t use global variables to contain intermediate results If you need to compute a new value for a global variable, assign the global variable the final value at the end of the computation rather than using it to hold the result of intermediate calculations. Don t pretend you re not using global data by putting all your data into a monster object and passing it everywhere Putting everything into one huge object might satisfy the letter of the law by avoiding global variables. But it s pure overhead, producing none of the benefits of true encapsulation. If you use global data, do it openly. Don t try to disguise it with obese objects.
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13. Unusual Data Types
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Additional Resources
Maguire, Steve. Writing Solid Code. Redmond, WA: Microsoft Press, 1993. 3 contains an excellent discussion of the hazards of pointer use and numerous specific tips for avoiding problems with pointers. Meyers, Scott. Effective C++, 2d Ed, Reading, Mass.: Addison Wesley, 1998; Meyers, Scott, More Effective C++, Reading, Mass.: Addison Wesley, 1996. As the titles suggest, these books contain numerous specific tips for improving C++ programs, including guidelines for using pointers safely and effectively. More Effective C++ in particular contains an excellent discussion of C++ s memory management issues.
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CHECKLIST: Considerations In Using Unusual Data Types
Structures
Have you used structures instead of naked variables to organize and manipulate groups of related data Have you considered creating a class as an alternative to using a structure
Global Data
Are all variables local or class-scope unless they absolutely need to be global Do variable naming conventions differentiate among local, class, and global data Are all global variables documented Is the code free of pseudoglobal data mammoth objects containing a mishmash of data that s passed to every routine Are access routines used instead of global data Are access routines and data organized into classes Do access routines provide a level of abstraction beyond the underlying data-type implementations Are all related access routines at the same level of abstraction
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