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There are a number of interesting anomalies here, and, as we saw with the costing of hash joins, the changes in cost as you try to change your strategy are probably more important than the exact details of how specific costs are calculated The first point to pick out is that when you try to convert from using the sort_area_size to the pga_aggregate_target, the cost figures don t align very well if you work with the 5% figure that is quoted as the limiting workarea size In fact, if you cross-check the first few costs for this sort in columns 2 and 4 (the two No CPU Costing columns), you see that the figures for pga_aggregate_target might be a better match for the sort_area_size if you assumed a 1% limit, rather than the 5% limit.

Since the CLI inheritance model does allow multiple inheritance of interfaces, it is quite expressive, and most people say that it is flexible enough to handle most of the issues that true, full multiple inheritance supports Of course, there will no doubt be some multiple inheritance fans who will point out design patterns that seem to absolutely require C++ multiple inheritance Technically, you can still create and use a native, multiple-inheritance-based C++ class hierarchy in.

Now you will see a screen similar to the one at the right. Glide the Trackpad to a Category and click to check or uncheck it. You can add a new Category by pressing the Menu key and selecting New. Click the Save option to save your Categories settings, and then click the Save option to save the memo.

The next point to pick out is that if you are currently running with manual work areas, and decide to try enabling CPU costing without switching to automatic work areas, the cost of some sorts will drop dramatically In fact, this behavior looks to me like a correction in the costing model the drop to zero cost occurs at about the point in the model where the sort will complete entirely in memory (It is unfortunate that the model doesn t necessarily give a true image of the memory required but at least the model becomes self-consistent if this drop does occur.

To filter memos using the Categories option or to see only memos in a specific Category, follow these steps: 1. 2. 3. Start the MemoPad program by clicking it. Press the Menu key and select Filter. Now glide to and click (or press the Space key) on the Category you would like to use to filter the list of memos. You can tell a Category is filtered because it is shown with a black line at the top of the window, under the Find: heading.

) The third point about these figures shows up in the larger memory sizes I had about 2MB of data to sort (300,000 rows of 6 bytes each if you ignore the overheads introduced by the sorting), which turns into about 7MB if you allow for all the extra bytes and pointers But even when the allowed memory was 30MB, the optimizer assigned a large cost to a sort that I knew would complete in memory There are numerous little oddities with three of the four models.

your C++/CLI programs (as long you re not using safe mode) if your design requires it. You just can t have it be a managed type. Another difference between inheritance in C++/CLI and classic C++ is the absence of private or protected inheritance. Inheritance is always public, but the public keyword is optional. Private inheritance was sometimes used in classic C++ to inherit an implementation: it is intended to model the has-a relationship, which can also be modeled by containing the type as a field. It is sometimes said that value types cannot participate in inheritance. This is not strictly true; value types can implement interfaces, but not inherit from other value classes or reference types. Value types do inherit from System::ValueType, although they have to be boxed in order to realize this inheritance relationship. Unboxed value types have no virtual function table with which to participate in polymorphism.

You ve probably noticed that pressing the Escape key (which clears out the Find: characters typed) will do nothing for the Filter; doing this just exits the MemoPad program. When you re-enter the program, you still see the filtered list. To unfilter, or turn off the filter, you need to do the following: 1. 2. 3. Press the Menu key. Select Filter. Glide to and uncheck a checked Category by clicking the Trackpad on that Category or by pressing the Space key.