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4 Your code is faster because it doesn t have to call system routines (that manipulate a linked list) to free the memory it s done with 5 Your code is more reliable, because you reduce memory leaks and because you never have data structures that refer to memory that s already been freed These are five rather impressive advantages Reference counting (which native code Delphis use for strings, dynamic arrays, and interfaces) offers the same no-need-to-free simplicity and safety but you pay for it with the overhead of maintaining the reference counts, and reference counting can t handle circular references.

Steps to create survey in Figure 2-12

19. In the Publishers list, click Algodata Infosystems and verify the grid data appears. 20. In the grid of books, click the Select link associated with the title The Busy Executive s Database Guide. Verify that the Authors list is filtered. Figure 7-4 shows the final project.

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Incrementing a counter every time you pass a value to a method and decrementing it when the method returns isn t particularly expensive, but it does bloat your code, and it does add up when method A passes the same value to methods B and C, each of which may in turn pass it on two or three times (Many Delphi programmers make a point of passing reference counted parameters as const parameters, because const parameters don t touch the reference count) Reference counting incurs execution costs A circular reference is an object referring to another object that ultimately refers back to the first object If A refers to B, and B refers to C, and C refers to A, none of the reference counts will ever go to 0, and neither A, B, nor C will ever be freed That is, reference counting can lead to memory leaks.

1. 2. 3. 4. 5. 6. 7. 8. 9. Navigate to the site where you want to create the survey. Select Site Actions View All Site Contents. Click the Create button from the top of the page. Select from the available list types, the survey list. Provide a name for the site: Collaboration Training Survey. Click More Options. Enter an optional description. Choose whether to display the survey in the Quick Launch area. In the Survey Options section, choose not to show the user names and choose not to allow multiple responses.

By contrast, garbage collection can handle circular references because it doesn t do reference counting Instead, it keeps the memory that s in use, and trashes the rest, no matter what its inner relationships With a conventional heap system, you pay a price for every block you allocate and you pay a somewhat higher price for every block you free With a garbage collection system, allocation is almost free and deallocation is cheap: for the most part, you pay only for the data that you have to relocate..

12. From the question types, select Date and Time a. The screen now refreshes to show additional settings for this question type 13. Select Yes for the question Require a response to this question. 14. For the question Enforce unique values, select No. 15. For the question Date and Time Format, select Date Only. 16. For the Default value, select (None). 17. Click the Next Question button at the bottom of the page. 18. Enter the second question: Did you have experience building

Custom tool parts allow you to create specialized user interfaces within the property pane. These tool parts lend support to properties that go beyond the fundamental data types. In this exercise, you will create a Web Part with a text property designed to only accept a properly formatted phone number as a value.

More on generations The first garbage collection systems,1 in the 60s and 70s, only garbage collected when an allocation failed. This meant that they were prone to locking up your program for several seconds, at random intervals. This gave garbage collection a bad reputation. On .NET, most garbage collections take less time than a page fault, which you typically don t even notice. (Some programs are less garbage collection friendly than others. I talk about this in the Pathological Cases subsection, later in this chapter.) Partly, of course, this is just that machines are so much faster than they were 30 or 40 years ago but mostly this reflects decades of experience. Garbage collecting some memory takes less time than garbage collecting all memory. This should be obvious. What may not be so obvious is that memory life spans are distributed according to a power law. Most memory is freed quite soon after it s allocated. Most of what s left is freed within seconds or minutes. And most of what lasts longer than that lasts until the program shuts down.

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