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Listing 9-7. Disambiguating Name Collisions // class_interface_method_ambiguity.cpp using namespace System; interface class IA { void f(); }; ref class A : IA { public: // Note that new is not used here. void f() { Console::WriteLine("A::f"); } // explicit implementation syntax virtual void fIA() = IA::f { Console::WriteLine("A::fIA implementing IA::f"); } }; int main() { A^ a = gcnew A(); IA^ ia = a; ia->f(); a->f(); } Here is the output of Listing 9-7: A::fIA implementing IA::f A::f As you can see, the method that gets called is determined by whether the method is accessed through the interface or through the object. Now let s turn to the case of a class implementing two interfaces with the same name. Inheritance in C++/CLI (and in other CLI languages such as C# and VB .NET) is different from interface inheritance in some other languages, such as Java. The big difference between the interface inheritance model in Java and the CLI is that CLI interfaces are independent of each other, whereas in Java, interfaces can interfere with each other when name collisions arise, such as when two or more interfaces implemented by the same type have methods with

4. Click the Configure button so that you can point to the appropriate directory. 5. In the FILE Transport Properties dialog box, click the Browse button and locate the in directory you created earlier. Your dialog box should now appear as shown in Figure 8-13.

You can set the maximum size of a file that the staff user can create to 10 MB by modifying the data resource limit in kilobytes like this: @staff hard memlock 10240

the same name In the Java inheritance model, this is an ambiguity that must be resolved to a single method In the CLI inheritance model, both methods may be available on the type, and you may access them both depending on what interface pointer you might be using This rule is like the rule used for interfaces in COM What this really means is that when you re creating a class that implements two interfaces that have methods with similar names, you don t have to care about what potential name conflicts might arise In Java, it can be difficult to create one method that is a viable implementation of both interfaces In CLI-based languages, both methods can coexist, and the interface handle that is used determines which method is called Explicit interface implementation is the language construct that allows you to support interfaces that have name conflicts.

If you would like to limit the number of processes available to juan to 80, you can modifying the resource limit nproc like so: juan hard nproc 80

Summary

You create one method definition for each interface that has the method, and you mark it in such a way that the compiler knows that it s the version of the method to be used when accessed through a given interface handle type If it s not being accessed through an interface handle, but rather through a handle with the type of the object, the calling code must resolve the ambiguity by specifying the interface in the call Consider the code in Listing 9-8 Listing 9-8 Disambiguating by Specifying an Interface // interface_name_collision.

Figure 8-13. File transport specifications 6. The File Mask setting, *.xml, is exactly what you re after, so there is no need to modify that. You re not interested in any of the other settings for this component, so click OK. 7. Click OK to accept the settings in the Receive Location Properties dialog box. 8. You won t be assigning a map to the inbound process, so go ahead and click OK in the Receive Port Properties dialog box.

You are now able to manage users not just by adding, editing, and deleting users and groups but also by limiting the resources these users can access through disk quotas and pam_limits. This will give you much greater control over your CentOS system and will allow you to feel safer deploying a server into production. In the next chapter, we will be looking at the X Windows system. Unlike Windows where the graphical user interface (or GUI) is built in, with Linux systems, it is an added extra. While you may encounter few Linux servers with X Windows installed, it is, of course, essential for use as a desktop, so it s a vital skill for you to learn.

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