Concept:

Resource Acquisition Is Initialization

Headline

RAII is a memory management technique in which resources (memory, file handles etc.) are tied to object lifetime: they are acquired when an object is initialized and released when the object is destroyed.

Illustration

A good way to illustrate RAII are mutex locks in Language:CPlusPlus:

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Once the lock goes out of scope - be it through the function returning or an exception being thrown - the object is destroyed and the lock is released. This approach is generally used in conjunction with Manual memory management for the cases that RAII is not suitable, and in turn RAII can be used to wrap around Manual memory management.


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