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In classic C++, you dereference a pointer using the * operator. The same is true of handles in C++/CLI. Subsequent assignment to a variable without a handle will result in a copy being made. Dereferenced handles may be assigned to tracking references without a copy being made. If a copy is made, there must be a copy constructor defined. Remember that copy constructors are not defined automatically for reference types as they are for native types. Listing 4-14 shows the basic syntax. Listing 4-14. Dereferencing Handles R^ r_handle = gcnew R(); R r_auto = *r_handle; // copy ctor used R% r_ref = *r_handle; // not copied

If we take our sample data set from the previous section and create a histogram with 75 buckets (script c_skew_ht_01.sql in the online code suite), we can notice small, but significant, details in the results that get stored in the data dictionary: begin dbms_stats.gather_table_stats( user, 't1', cascade => true, estimate_percent => null, method_opt => 'for all columns size 75' ); end; /

To correct one of these words, just glide the cursor back into the word with the trackpad and click. You will see a list of suggested changes, just glide to and click the correct word. If the word is spelled correctly and you want to add the word to your custom word list (custom dictionary), press the Menu key and select Add to Dictionary. We show you more on the custom dictionary in Figure 6-5.

select num_distinct, density, num_buckets from user_tab_columns where and ; table_name = 'T1' column_name = 'SKEW'

You will quickly find out that you need to add or delete words in your custom dictionary (e.g., a name or other unique word that is spelled correctly but not in the default standard dictionary).

Copy constructors take a tracking reference (%) as a parameter, as shown in Listing 4-15. Listing 4-15. Using Tracking References with Copy Constructors // passing_with_copy_ctor.cpp using namespace System; ref class R { int val; String^ str; public: property int Value { int get() { return val; } void set(int i) { val = i; } } property String^ Label { String^ get() { return str; } void set(String^ s) { str = s; } } R(int val_in, String^ label) : val(val), str(label) { } R(const R% r) { // Copy the elements of R. // Value is a value type, so it gets copied. val = r.val; // Strings are immutable, so // a reference copy will work here even // in a copy ctor. str = r.str; } }; Unlike in classic C++, there is no default copy constructor generated for a managed class, so you need to define one explicitly in order to use this method of parameter passing. The parameter to a copy constructor is normally declared const, although the language does not enforce this. If you do use a const reference as a parameter, you cannot use properties in the copy constructor, since properties take nonconstant parameters. The solution is to use the fields directly in the body of the copy constructor, as in Listing 4-15.

NUM_DISTINCT DENSITY NUM_BUCKETS ------------ ---------- ----------80 .013885925 58 select endpoint_number, endpoint_value from user_tab_histograms where column_name = 'SKEW' and table_name = 'T1' order by endpoint_number ;

Sometimes, you might use unique words (e.g., local place names) in your e-mail messages that are not found in the standard dictionary. One of the options offered to you is to add the word to your own unique custom dictionary. The advantages of this are (1) that you will never again be asked to replace that word with something suggested and (2) if you misspell this custom word, you will be given the correct spelling. To add a new word, follow these steps, as shown in Figure 6-6. 1. 2. 3. 4. 5. During the spell checking process, the spell check program will notice a word that it believes is misspelled. In this example, we are using Flagler, a county in Florida, which is not in the standard dictionary. You will see that the spelling checker suggests options for replacing the word, none of which are correct. Press the Menu key. Click Add to Dictionary to add the word to your own custom dictionary.