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The significant lines are those added after the comment validate username/password here. You just add a CFQUERY and a CFIF test, which we will explain next. The rest of the page is the same as before. Again, if you re using any of the other forms of authentication (j_username forms or basic authentication), the process is similar, but the incoming pair of username and password values is in cflogin.username and cflogin.password, respectively. ColdFusion queries always return a query variable called recordcount. In this case, getlogin.recordcount is available that indicates how many records are found. If the query fails to return any records (that is, recordcount is 0), you know that the user provided an invalid username/password pair, and you should display the login form again and stop processing. Otherwise, the login is successful, and the flow of control of the program can proceed with the CFLOGINUSER. It s that simple.

This popular tutorial introduction towould happen been completely updated, reorganized, and rewritten to help Exercise What standard C++ has if we gave our HasPtr class a destructor programmers 1321: language faster andits pointer member learn the thatdeleted 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 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 Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design techniques Filled with new learning aids that emphasize important points, warn about common In the suggest good programming defined and provide class that heldComplete withand an int reinforce skills previous section we practices, a simple general usage tips a pointer exercises that The pointer pitfalls, member behaved incomprehensive in any other pointercode for the book'smade toexamples is available on all ways like its coverageThe source Any changes extended the object to which learned Authoritative and the Web at thepointed were made to a single, shared object If the user deleted that object, then pointer address below the

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An alternative to having a pointer member behave exactly like a pointer is to define what is sometimes referred to as a smart pointer class A smart pointer behaves like an ordinary pointer except that it adds functionality In this case, we'll give our smart pointer the responsibility for deleting the shared object Users will dynamically allocate an object and pass the address of that object to our new HasPtr class The user may still access the object through a plain pointer but must not delete the pointer The HasPtr class will ensure that the object is deleted when the last HasPtr that points to it is destroyed In other ways, our HasPtr will behave like a plain pointer In particular, when we copy a HasPtr object, the copy and the original will point to the same underlying object If we change that object through one copy, the value will be changed when accessed through the other Our new HasPtr class will need a destructor to delete the pointer However, the destructor cannot delete the pointer unconditionally If two HasPtr objects point to the same underlying object, we don't want to delete the object until both objects are destroyed To write the destructor, we need to know whether this HasPtr is the last one pointing to a given object

Control then also flow out of the Application.cfm to whatever page was being executed that triggered the Application.cfm and when they were detected to not be logged in. It took us quite a while to get to this point of 30 lines or so of code in this sample Application.cfm. I hope you can appreciate, however, that much of the process is simply not obvious, even to (and perhaps especially to) experienced CF developers. The details are also given short shrift in the documentation and many other articles and books.

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