The fastest way to create a program is to
use code that’s already written: a library. A major goal in C++ is to make
library use easier. This is accomplished by casting libraries into new data
types (classes), so that bringing in a library means adding new types to the
language. Because the C++ compiler takes care of how the library is used –
guaranteeing proper initialization and cleanup, and ensuring that functions are
called properly – you can focus on what you want the library to do, not
how you have to do it.
