The fundamental building block of OO software.
A
class
defines a data type, much like a struct
would be in C. In a computer science sense, a type consists of both
a set of states and a set of operations which transition between those states. Thus int
is a type because it has
both a set of states and it has operations like i + j
or i++
, etc. In exactly the same way, a class
provides a
set of (usually public
) operations, and a set of (usually non-public
) data bits representing the abstract values
that instances of the type can have.
You can imagine that
int
is a class
that has member functions called operator++
, etc. (int
isn’t really a
class
, but the basic analogy is this: a class
is a type, much like int
is a type.)
Note: a C programmer can think of a
class
as a C struct
whose members default to private
. But if that’s all you
think of a class
, then you probably need to experience a personal paradigm shift.
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