Analysis and implementation of design patterns (c + +) 13-flyweight mode

Role:

The use of sharing technology to effectively support a large number of fine-grained objects.

UML Structure diagram:

Analytical:

Flyweight patterns are often used when you use a large number of objects that can be shared. For example, in the QQ chat many times you do not bother to reply and have to reply, the general will use some polite words perfunctory others, such as "hehe", "good" and so on, These simple answers in fact everyone is defined in advance, in the use of the time to call out. Flyweight is based on the idea of solving this problem, and when you need an object that you can share in other places, check to see if the same object already exists, and use it directly if it is not generated. So, Flyweight mode and Factory mode are often mixed.