Write about template programming in c plusplus?

Answer 1

Template programming in C++ is the technique of writing a class that handles arbitrary data types instead of specific data types.

For instance, if you had a class that implemented a linked list of integers (int), and you wanted a linked list of floating points (double), you would need to clone the class implementation of list-int and make it list-double, and you would need to modify all the places in the class that pertain to int and change it to double.

Templates, on the other hand, allow you to implement a generic class, say a linked list of <type-t>. Then, when you declare a linked list of double, the compiler creates the class and replaces all <type-t> with double. For this to work correctly, the list portion of the class must be able to reliably perform whatever tests it might need on the type portion of the class without knowing anything about that type. This generally means that all possible relational operators have to be overloaded as needed.