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Analyzed over 5 years ago. based on code collected over 7 years ago.

Flyweights are small handle classes for immutable data that intelligently share their content to prevent memory duplication. The Flyweight class has been designed as simply as possible and can be used as a drop-in replacement for T.

ProblemImagine an application that has hundreds or thousands of users. Each user has a first and last name, stored as separate strings in memory. It is highly likely that some of them share the same first or last names; if there are 20 people with the first name "Richard" then 20 duplicate instances of "Richard" will exist in memory.

SolutionThe best way to demonstrate how Flyweights can address this problem is with a very simple example:

Flyweight a = "Richard";
Flyweight b = "Richard";
Flyweight c = "Richard";
Flyweight d = "Richard";
Flyweight e = "Richard";With regular System.String objects, five separate copies of "Richard" would exist concurrently, even though they are all identical. Flyweights can detect this, and will only store one object in memory.

DocumentationFlyweight details and examples UnsafeFlyweight details and examples Design and rationale Extending the library Acknowledgements DownloadThe Flyweights source is currently available in SVN, or via the downloads page.

Requirements.NET framework 2.0 or higher.


In a Nutshell, flyweights...


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