| • Science | • People | • Locations | • Timeline |
In some occasions, some object can be conceived of as a sub program which can communicate with others by receiving or giving instructions based on its, or the other's, data or methods. Data can consist of numbers, literal strings, variables, references. An object is often thought of as a region of storage.
One of the benefits claimed for object-oriented program is that it can model real life problems "naturally" by a sort of simulation. This type of system is usually constructed in a class-based language, where an instance is an "instantiated" object of a particular class. Each instance is a variation on a general theme, one which is defined by the parent class. For example, my dog "Killer" could be described as an instance of a dog (where dogs are a class of animal).
A kind of objects:
A duplication of an object is commonly done by copying each attribute and objects belonging to the object recursively. This is usually time-consuming. The duplication of listIn computer science, a list is an abstract concept denoting an ordered collection of fixed-length entities. In practice, any list is either an array or a linked list of some sort. The use of the concept allows to treat them regardless of implementation.s, for instance, involves copying each element.
Defensive copy is an act to ensure that the object retains a state that is at the moment of duplication. An interesting problem has been addressed [1], which is related to the implementation of string class in STL:
# includeThe specification of C++ understandably says t should not be changed. This problem is only mitigated by the use of defensive copy, which in turn wipes out any benefit gained by the use of reference countingIn computer science, reference counting is a technique of storing the number of references, pointers or handles to a resource such as an object or block of memory. Use in garbage collection Reference counting is often known as a garbage collection algorit.