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<cfif isdefined( form.logout )> <cflogout> </cfif> <cflogin idletimeout= 20 > not logged in<br> <!--- assume we ve prompted the user for username and password and the values were bsmith and bpw---> <cfloginuser name= bsmith password= bpw roles= > now logged in<br> </cflogin> <!--- GetAuthUser() returns the empty string if not logged in ---> <cfif GetAuthUser() is not > <form method= post > <input type= submit name= logout value= Logout > </form> </cfif> <cfoutput>#timeformat(now(), hh:mm:ss tt )#</cfoutput>

When a tutorial introduction toIs Called been completely updated, reorganized, and rewritten to help This popular Destructor standard C++ has

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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 is called automatically whenever an object of its class is destroyed: The destructor 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 // p points to of the library, and explain the features of C++, also show how to make the best use of the Examples that take advantage default constructed object Sales_item *p = new Sales_item; 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 // new scope Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming Sales_item item(*p); new learning aids that copies *p important styles and program design techniques Filled with// copy constructor emphasizeinto item points, warn about common pitfalls, suggest good programming practices, and provide general usageon object pointed to by p delete p; // destructor called 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 } // exit local scope; destructor called on item the Web at the address below

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This example is using a new function in CF MX, called GetAuthUser(). Its purpose is to enable you to access the username that the user enters on logging in after you ve used CFLOGINUSER. This saves you from needing to store the username in a session variable or the like. One other way to use it is for determining whether the user has indeed logged in. If not, the GetAuthUser() returns an empty string.

Variables such as item are destroyed automatically when they go out of scope Hence, the destructor on item is run when the close curly is encountered An object that is dynamically allocated is destroyed only when a pointer pointing to the object isdelete d If we do not delete a pointer to a dynamically allocated object, then the destructor is never run on that object The object will persist forever, leading to a memory leak Moreover, any resources used inside the object will also not be released

At the start of this chapter we contrasted traditional engineering approaches that focus on writing requirements with modern-day engineering approaches that focus on specifying capabilities Our discussion of the System Capability Construct serves as compelling objective evidence as to WHY it is important to structure and specify a capability and then translate it into a requirements statement Operations within the structure serve as a graphical checklist for speci cation requirements namely WHAT is to be accomplished and HOW WELL (performance) without stating HOW it is to be implemented Author s Note 223 For those who think that we have violated a cardinal rule of system speci cations by specifying HOW to implement a solution, our answer is no We have not speci ed HOW Instead, we have translated System Capability Construct operations or tasks into text-based requirements statements that identify WHAT must be accomplished.

Note Note that the GetAuthUser()function will only return a value if it s used on a page that s executed a CFLOGIN tag, or if it s been executed (as in this case) in the Application.cfm. An exception to this rule will be if you use the approach to authentication in Using declarative basic authentication. There we will see that GetAuthUser() returns the authenticated username even though we don t use a CFLOGIN tag at all.

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