Common term of C++

Private  -  Functions and variables to which only the class member functions (and friends) have access.

Public  -  Functions, and rarely non-constant variables, that are directly accessible through an object.

Protected  -  The protected keyword behaves the same as the private keyword, with the exception that protected variables are directly accessible from within subclasses.

Object  -  An object is an instance of a class; it is a variable with all the functionality specified in the class's definition.

Data Member  -  A data member is a variable declared in a class definition.

Member Function  -  Functions that belong to a class and operate on a its data members.

Constructor  -  The constructor of a class is the function that is called automatically when a new object is created. It should initialize the class's data members and allocate any necessary memory.

Destructor  -  A destructor is the function called when an object goes out of scope. It should free memory dynamically allocated for the object's data members.

Friend  -  A friend function is a function that has access to all the class's data members and member functions, including those under the private and protected headings.

Inheritance  -  Inheritance is the property exhibited when a subclass is derived from a superclass. In particular it refers to the fact that an instance of the subclass has all of the data members and member functions of the superclass (and possibly more).

Base Class  -  A base class is a class from which another class, called a derived class, inherits components.

Derived Class  -  A derived class is a class which has inherited the components of another class, called the base class.

Class Template  -  A class which has one or more data members (and functions) of some unspecified data type. By defining a template, the programmer can create an object using any data type or types.

Composition  -  Composition is the use of an object as a member variable of another class as an alternative to creating a subclass.

Virtual  -  A C++ key word used to qualify functions and inheritance.