Read-only objects are those that have private immutable member variables with public accessors (getters) but no public mutators (setters). The object members are typically initialised during construction, but the member variables cannot be altered thereafter, thus they are read-only.
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Passive objects encapsulate state and operations, whereas active objects also encapsulate a process. Standard C++ does not support active objects.
The only things that may be different for all objects of a class are their member variables. They represent the object's data. The only things that remain the same are the static members -- they are akin to global variables, but are local to all objects of the class type.
You declare a class as follows: class MyClass { //some stuff here... } You create an object as follows: MyClass object; This is how you create classes and objects in C++.
Entities are the objects instantiated by your program, both at compile time and at runtime. Some objects are primitive data types, others are more complex such as objects instantiated from a class.
Encapsulation.