Customization of C Template: Custom C class
The basic syntax of the class template is as follows:
Template
Class classname
{
......
}
T can be any type, I will give an example of a class template (please don't pursue this class, you need to write or have something to write, remember this is just example, our concern should be the characteristics of the language, this only Is it the most important, isn't it?).
Template
Class Operation
{
PUBLIC:
Operation (T T1, T T2): _ VAL1 (T1), _ VAL2 (T2) {}
~ Operation () {}
T Plus ()
{
Return_val1 _val2;
}
T minus ()
{
Return_val1-_val2;
}
T multiplies ()
{
Return_val1 * _val2;
}
T Divides ()
{
Return_val1 / _val2;
}
Private:
T _VAL1, _VAL2;
}
This class encapsulates four calculations. If t is a user-defined type, then the ' ', ',', '*', '/' operator must be overloaded. But when you declare a class object in the following way, you will encounter the problem, or you don't want this type to have similar operations.
Char szarr1 [] = "yuankai";
Char Szarr2 [] = "WinMain";
Operation
Cout << Obj2.plus () << endl; // You may want to have different operations
Cout << Obj2. Divides () << endl; // You may not fully have this operation at all
What to do, of course, is customized. We can customize a statement to solve this problem.
Class Operation
{
PUBLIC:
Operation (Char * T1, Char * T2): _ VAL1 (T1), _ VAL2 (T2) {}
~ Operation () {}
Char * plus ()
{
Strcat (_val1, _val2); // should pay attention to overflow
Return_val1;
}
Void Display ()
{
Cout << _ VAL1 << endl;
COUT << _ VAL2 << Endl;
}
Private:
Char * _val1, * _ var2;
}
This way we can use the Operation class as follows.
Char szarr1 [] = "yuankai";
Char Szarr2 [] = "WinMain";
Operation
Operation
Cout << Obj1.divides () << endl;
Obj2.display ();
COUT << obj2.plus () << endl;
Cout << obj2.divides () << Endl; // will compile errors because there is no divides () function
Some visible template customization can give us full control, just like the cold acid's dental cream advertisement, how to use (eat) (eat). Not? Haha ... Understand the custom function template makes us more flexibility when using the C class, give us more free space.
The rush of the article, there is a typison or error, please pay more. Welcome to communicate with you. If everyone can, I will continue to write out (----- Yuan Kai -----).
