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15 lines
719 B
Markdown
15 lines
719 B
Markdown
## Flyweight
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Flyweight pattern has has structural purpose, applies to objects and uses sharing to support
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large numbers of fine-grained objects efficiently. The pattern can be used to reduce
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memory usage when you need to create a large number of similar objects.
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### When to use
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* when one instance of a class can be used to provide many "virtual instances"
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* when all of the following are true
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* an application uses a large number of objects
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* storage costs are high because of the sheer quantity of objects
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* most object state can be made extrinsic
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* many groups of objects may be replaced by relatively few shared objects once extrinsic state is removed
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* the application doesn't depend on object identity |