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How to write a function template
A function template should be written at the beginning of the program in the global area, or you may place it into a header file. All function templates begin with a template declaration.
The syntax is :
1. the keyword class ( this usage of class has nothing to do with the key word class used to make user-defined type.)
2. a variable that shows some generic type, and will be used whenever this type requires to be written in the function definition. Typically the name T is used, but any valid C++ name will do.
e.g.
template < class T>
T max(char x, char y)
{
return ( x > y) ? x : y ;
}
void main()
cout << max( 1,2) << endl;
cout << max( 5.62,3.48) << endl;
cout << max('A','a') << endl;
cout << max( 4,3) << endl;
The output is :
2
5.62
a
6
find area uder the curve y=f(x) between x=a and x=b
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A: It let you to provide an intuitive interface to users of your class, as well as makes it possible for templates to equally work well with classes and built-in/intrinsic types.
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