design-patterns-cpp

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Jakub Vojvoda a0b0ea4f8e code refactoring: fix memory leaks, code style, etc.

2019-01-31 19:57:40 +01:00

Observer.cpp

code refactoring: fix memory leaks, code style, etc.

2019-01-31 19:57:40 +01:00

README.md

add Observer pattern

2016-10-03 10:21:01 +02:00

README.md

Observer

Observer defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. The pattern has behavioral purpose and applies to the objects.

When to use

when an abstraction has two aspects, one dependent on the other
when a change to one object requires changing others, and you don't know how many objects need to be changed
when an object should be able to notify other objects without making assumptions about who these objects are