Login | Register   
RSS Feed
Download our iPhone app
Browse DevX
Sign up for e-mail newsletters from DevX

Tip of the Day
Language: C++
Expertise: Intermediate
May 17, 1999

Enhance Performance Using the Reference Counting Idiom

Under some circumstances, the reference counting model can enhance performance in terms of both memory usage and speed. A reference counting class counts how many object instances have an identical state. When two or more instances share the same state, the implementations creates only a single copy and counts the number of existing references to this copy. For example, an array of strings can be represented as a single string object that holds the number of elements in the array. Since initially the array elements share the same state (they all are empty strings), only a single object is actually needed to represent the array. When one of the array elements changes its state (it is assigned a different value, for instance), the reference counting object creates one more object--this is called "copy on write."
Danny Kalev
Comment and Contribute






(Maximum characters: 1200). You have 1200 characters left.



Thanks for your registration, follow us on our social networks to keep up-to-date