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In Listing 7-23, observe several things: The explicit keyword on operator int used in BigIntExplicit disallows implicit conversions from BigIntExplicit to int. This is useful if you want to prevent unexpected conversions from taking place without an explicit cast. The explicit keyword on the constructor for BigIntExplicit has no effect. We need the static operator BigInt that takes an int to convert. Again we have the choice of making the operator explicit or implicit. We use the preferred safe_cast casting mechanism. C-style casts (i.e., using the target type name in parentheses) are supported in C++/CLI, and if used, evaluate to another type of cast. All of the preceding conversion functions will work with C-style casts and static_cast as well. In the next sections, I ll explain casting in C++/CLI and review the various casting mechanisms in classic C++, which are also available in C++/CLI. The next chapter will revisit dynamic_cast in the context of inheritance.

5. 6.

---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=1834 Card=1818 Bytes=209070) 1 0 NESTED LOOPS (Cost=1834 Card=1818 Bytes=209070) 2 1 VIEW (Cost=16 Card=1818 Bytes=12726) 3 2 SORT (ORDER BY) (Cost=16 Card=1818 Bytes=19998) 4 3 INDEX (FAST FULL SCAN) OF 'T1_I' (INDEX) (Cost=5 Card=1818 Bytes=19998) 5 1 TABLE ACCESS (BY USER ROWID) OF 'T1' (TABLE) (Cost=1 Card=1 Bytes=108) If the optimizer ever acquires this new access path, then some people may suddenly have problems on an upgrade because they fall into that unhappy band of DBAs who have indexes where the number of leaf blocks in use is always far less than the number of blocks below the high water mark. Suddenly some people really could have a good reason for regularly rebuilding a few indexes.

Once you re done, press the Menu key and select Save to save your Category settings. Press the Menu key and select Save again.

I have picked scalar subqueries as my next topic because their implementation is tied so closely to the implementation of the filter operation described previously. It would be interesting to

C-style casts are casts that use the parentheses syntax used in C. The use of C-style casts is not recommended since it can be difficult to tell what type of cast will actually be performed. However, there are definite rules that determine the type of cast actually performed. Basically, the compiler attempts various types of casts ranging from the safest to the least safe. If possible, the validity of the cast will be determined at compile time. If the types involved in the conversion differ only by whether or not they are constant, the cast is interpreted as a const_cast. If the two types are in the same inheritance chain or are both interface handles, the safe_cast is used. Next, the compiler will attempt to interpret the cast as a static_cast. This will succeed if the types have a defined conversion (for example, a conversion operator). Also, if a safe_cast or static_cast will work if combined with a const_cast, the compiler will do so. Finally, if the compiler cannot determine whether a static_cast is valid, a runtime check will be performed. If the runtime check fails, an InvalidCastException will be generated.

Once you assign a Task to a Category, you can filter or show only those Tasks assigned to a particular Category. To do this, follow these steps: 1. 2. View your Tasks list and press the Menu key. Select Filter, then check off a particular Category for the filter by tapping the Space key on the appropriate check box. Here is the filtered Tasks list:

discover whether the filter optimization came about because of the work done by the developers to accommodate scalar subqueries, or whether the scalar subquery became viable because of the optimization method created for filtering subqueries. Consider the following rewrite of our original query (see scalar_sub_01.sql in the online code suite): select count(av_sal) from ( select /*+ no_merge */ outer.dept_no, outer.sal, outer.emp_no, outer.padding, ( select avg(inner.sal) from emp inner where inner.dept_no = outer.dept_no ) av_sal emp outer

Immediately, you will see a black line at the top of the window with the Category name showing; this indicates that the Tasks list is filtered by the specified Category.