Observer design pattern in C++

Question

Is the observer design pattern already defined in STL (Like the java.util.Observer and java.util.Observable in Java) ?

Answer 1

No it doesn't. The C++ STL is much smaller than Java's Standard Library. If you are looking for something to expand on the STL that is supported by almost everything, it would be worth taking a look at the Boost libraries. In this case you may want to look at Boost.Signals which provides a signal/slot model.

Answer 2

No, but Boost.Signals gives you something similar.

Answer 3

Here is a reference implementation (scroll to bottom of page).

http://en.wikipedia.org/wiki/Observer_pattern

Answer 4

the observer design pattern is not defined in the stl. you can refer to the gang of four design patterns book or a google search should provide enough details to implement it. if this answer isnt answered soon ill write a quick POC in code blocks.

Answer 5

As far as my knowledge goes in C++, STL doesn't have an implementation for Observer pattern. There was a proposal for Signal/Slot for standard library in TR2 though.

There are plenty of libraries which provides implementation for Observer pattern Qt library being one of the pioneers. The boost library has an implementation (see Boost::Signals & Boost::Signals2).

The Poco C++ library has a neat implementation of the observer pattern (see NotificationCenter).

libsigc++, cpp-events are some of the other libraries that provide signal/slot implementations.