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There is a risk of misusing these semantics, especially if you use the % operator to get the underlying handle to your stack semantics variable. You must be careful that there are no handles to the stack object that are retained after the function terminates. If you do retain a handle to the object and then try to access the object, you may silently access a destroyed object. The same dangers exist in calling delete on managed objects. You should try to use delete only when you can be sure that there are no others holding handles to the object you are deleting.

Another way to implement an interface isn t to add the interface to the class, but to subclass the original class, and then implement the interface. Figure 6-5 shows the UML diagram of this hierarchy.

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Suppose you d like to use stack semantics, but you still have a function that takes a handle type. Let s say we have to call a method Report in the PlantQuery function, and that method takes a handle to the DBConnection object. Now that we re using stack semantics, we don t have a handle type, we have a bare object. Listing 4-10 is the function we d like to call. Listing 4-10. A Method Requiring a Handle void Report(DBConnection^ connection) { // Log information about this connection. // ... } In order to call this method, you need to pass a handle, not the instance variable, as the connection parameter. You ll have to use the unary % operator to convert the instance variable to a handle, for example, to pass the variable to a function that takes a handle (see Listing 4-11). The % operator is like the address-of operator for managed types that returns a handle to the object, just as the address-of operator (&) in classic C++ returns a pointer to the object. The address-of operator (&) is used for primitive types, such as int, although you can still assign to a tracking reference. The % operator is used instead of the address-of operator for instances of reference and value types.

The accountHome field (line 13) has been initialized with other similar fields when the EJB was created, as shown at line 4 of Listing 11-8. Listing 11-8. The EJBCreate Method 01 02 03 04 05 06 07 08 public void ejbCreate() { try { txHome = EJBGetter.getTxHome(); accountHome = EJBGetter.getAccountHome(); } catch (Exception ex) { throw new EJBException("ejbCreate: " + ex.getMessage()); } } // ejbCreate The EJBGetter class factorizes the EJB Home resolving code, as shown in Listing 11-9.

Figure 6-5. UML diagram for a more complicated interface and class hierarchy In code terms, the UML diagram translates as follows: public class Implementation : IBase1 { public int Value() { return 1; } } public class Derived : Implementation, IBase2 { public new int Value() { return 2; } } Implementation implements the interface IBase1 and represents a version 1.0 component. The class Derived implements the new interface IBase2, and subclasses Implementation.

Listing 4-11. Using the % Operator public ref class PlantData { public: static Recordset^ PlantQuery(String^ search) { DBConnection connection; Report(%connection); return connection.Query( search); } }; You can certainly see that the % operator is the managed analog of the & operator for native types. The analogy extends also to the other use of the & symbol to represent a reference. Rather like a tracking handle, you can use % to declare a tracking reference. Like a handle, a tracking reference is updated whenever the garbage collector moves the object it is referencing. Tracking references are somewhat more limited in use than native references. They can be used in function arguments and declared on the stack, but they cannot be declared as a member of a class. They can be used to refer to handles, value types, or value type members, but they cannot be used to refer to objects of reference type directly (as opposed to through a handle). The declaration and assignment to a variable might look like this: int i = 110; int% iref = i; R r; R% r_ref = r; Just like a classic C++ reference, the tracking reference is another reference to the existing object, so if you change the value of the object through the reference and access the object through another means (such as the variable i itself in the foregoing example), the value is changed. There is still only one value. Figure 4-1 shows what s happening in memory.

corresponds to calling the computeAmountAndPrint method for the object o with the string ">>" as a parameter.

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