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Having toyed around a bit with C++0x Lambda Expression in G++, I was wondering as to how well the performance will be in general/specific situations compared to alternative ways without using lambda functions.
Does anybody know a more or less comprehensive discussion of lambda expression performance or situations in which one should avoid them despite more comfort while developing?
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Lambda functions are inline functions and thus execute comparatively faster. Many times lambda functions make code much more readable by avoiding the logical jumps caused by function calls.
sorting - Why is a C++ Lambda function much faster as compare function than an equivalent object - Stack Overflow. Stack Overflow for Teams – Start collaborating and sharing organizational knowledge.
The answer is it depends. I have seen cases where using a lambda was slower and where it was faster. I have also seen that with newer updates you get more optimal code.
I've seen a lot of questions here about Java lambdas performance, but most of them go like "Lambdas are slightly faster, but become slower when using closures" or "Warm-up vs execution times are different" or other such things.
If you consider the old-school way of defining a struct with operator () as an alternative way then there isn't gonna be any difference because lambdas are pretty much equivalent to that. Just syntactically more convenient. Let's wait for a more complete answer...
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