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Apparently they're seen as useful enough that C++11 got them, in its own C++ish way. You're probably already familiar with this new addition to C++, but just in case, C++ lambda functions can capture the state of their enclosing scope. The consensus seems to be that adding this feature to C++ was a big win for the language... something Perl's been doing for decades.

An introductory article on C++11's lambda closures.

One difficulty that C++'s "closures" have is that you can't really share a variable from an enclosing scope across several lambda functions if the variable's outer scope ends. This is because the way C++ implements them, the captured variables are either copies, or references. Copies can't really be shared. References can, but if the target falls out of scope the lambdas are left holding the bitter end of an unfastened rope.

But all is not lost; C++11 got shared reference counted pointers too.


Dave


In reply to Re^5: Real life uses for closures. (update: disambiguation) by davido
in thread Real life uses for closures. by BrowserUk

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