rdlc data matrix

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Inside main( ), this program creates two member pointers: dp, which points to the variable sum, and fp, which points to the function sum_it( ) Note carefully the syntax of each declaration The scope resolution operator is used to specify which class is being referred to The program also creates an object of myclass called c The program then obtains the addresses of sum and sum_it( ) As stated earlier, these addresses are really just offsets into an object of myclass where sum and sum_it( ) are found Next, the program uses a function pointer fp to call the sum_it( ) function of c The extra parentheses are necessary in order to correctly associate the * operator Finally, the summed value is displayed by accessing c s sum through dp When you are accessing a member of an object using an object or a reference, you must use the * operator However, if you are using a pointer to the object, you need to use the ->* operator, as illustrated in this version of the preceding program:

Bubble events Bubble up the tree to the root node at the top. The naming convention for bubbled events is the event name such as Click. Event bubbling allows each control to respond in turn to the various events that can occur. Tunnel events Tunnel down from the root of the visual tree. The naming convention for this type of event is Preview plus the event name, such as PreviewClick. As you may have surmised, a control higher up the tree can potentially hide an event from the element that generated it. Direct events Operate as traditional events do. Only the specific control is notified; parents and children aren t. As discussed previously, if this were a SpecialButton that derived from Button, it would still be able to take part in the event via an overridden event-handler method of the base Button class.

#include <iostream> using namespace std; class myclass { public: int sum; void myclass::sum_it(int x); }; void myclass::sum_it(int x) { int i; sum = 0; for(i=x; i; i--) sum += i; } int main() { int myclass::*dp; // pointer to an integer class member void (myclass::*fp)(int x); // pointer to member function myclass *c, d; // c is now a pointer to an object c = &d; // give c the address of an object dp = &myclass::sum; // get address of data fp = &myclass::sum_it; // get address of function (c->*fp)(7); // now, use ->* to call function cout << "summation of 7 is " << c->*dp; // use ->*

.

return 0; }

Without routed events, controls would need to manually call other related controls; each control in the chain would have to support the event, or the bubble/tunnel would stop. Because composition is so prevalent throughout WPF, being able to rely on event tunneling and bubbling is an important aspect of the system s flexibility. Like properties, events in WPF are greatly enhanced, allowing controls to respond to events without any special work to propagate the notifications.

In this version, c is now a pointer to an object of type myclass, and the ->* operator is used to access sum and sum_it( )

Sometimes you will create a class that you want to be able to freely mix in an expression with other types of data While overloaded operator functions can provide a means of mixing types, sometimes a simple conversion is all that you want In these cases, you can use a type conversion function to convert your class into a type compatible with that of the rest of the expression The general form of a type conversion function is operator type ( ) {return value ;} Here, type is the target type that you are converting your class to and value is the value of the class after conversion A conversion function must be a member of the class for which it is defined To illustrate how to create a conversion function, let s use the three_d class once again Suppose you want to be able to convert an object of type three_d into an integer so that it can be used in an integer expression Further, the conversion will take place by using the product of the three dimensions To accomplish this, you use a conversion function that looks like this: