What if we wanted to make a class which takes integers
or floating point numbers with single precision?
A simple way to achieve this is copy and paste our class and replace double with for
example int.
C++ allows us to do this automatically via the usage of templates, which
are the C++ constructs for parameterizing parts of
classes. Class templates is a template for producing classes. The declaration consists
of the keyword template followed by a list of template arguments enclosed in brackets.