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programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving HasPtr& HasPtr::operator=(const HasPtr &rhs) readers the means to write useful programs without first having to master every language detail Highlighting today's best { practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance ++rhsptr->use; // increment use count on rhs first Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the if (--ptr->use == 0) language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes delete ptr; // if use count goes to 0 on this object, delete it it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten ptr = rhsptr; // copy the U_Ptr object Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming val = rhsval; // copy the int member styles and program design techniques Filled with new learning aids that emphasize important points, warn about common return *this; pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills } learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address below

Be careful when working with roles. There are a few issues that can easily complicate your attempts to use them. First, be aware that roles are case-sensitive. If a user is in a Sales role but you test for IsUserInRole( sales ), the test does not match. Similarly, the testing performed by the roles attribute in CFFUNCTION is also case-sensitive. Second, handling multiple roles can be especially tricky. If you want to ensure that the user belongs to multiple roles, or any of several roles, you can do that, but you must be very careful. Consider that you might want to enable users to perform some task in some part of your application only if they are in both the Sales and Manager roles. With the IsUserInRole function, you wold perform this test as:

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Each system, product, or service is an asset of a higher level organization (i.e., system) that also has a system life cycle. Those same systems and products may include lower level systems or products that also have system life cycles. Therefore, we have multiple levels of system life cycles within higher level system life cycles. Suppose that a user has quantities of a product or system, including various versions in inventory. At some point in time, the User may decide to replace a speci c product or a group of products. For example, an airline might decide to replace a speci c aircraft by tail number or replace an entire eet of aircraft over a period of time. Each aircraft, which has its own system life cycle, is part of a much larger system such as a eet of aircraft, which also has its own system life cycle. To illustrate this point, Figure 7.2 provides an example.

Here we start by incrementing the use count in the right-hand operand Then we decrement and check the use count on this object As with the destructor, if this is the last object pointing to theU_Ptr, we delete the object, which in turn destroys the underlying int Having decremented (and possibly destroyed) the existing value in the left-hand operand, we then copy the pointer fromrhs into this object As usual, assignment returns a reference to this object

The user must belong to both roles. But it s very easy to intend or interpret that to mean the user is expected to be in either role. That s not the way things work. Going back to our test record from the section, Where to store and how to track a user s role(s) , the test record for bobz is assigned to Sales and Employes (sic) but not Manager, so he can t execute the restricted code in that previous code fragment. On the other hand, if you really want to test whether the user is in either one role or another, the proper test would be as follows:

This assignment operator guards against self-assignment by incrementing the use count of rhs before decrementing the use count of the left-hand operand

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With the roles attribute of CFFUNCTION, you could also list both roles as in:

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