When defining a function that takes a function parameter, should I receive a lambda/std::function by copy, reference or const reference?
Or all three?
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leewz
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It also depends on what you're planning on doing with it. Can you tell us more? – Dai Jun 02 '14 at 05:47
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1For `std::function`, I would go with copy. – R Sahu Jun 02 '14 at 05:50
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@Dai I'm considering the case where I'd be implementing functional programming's "map". – leewz Jun 02 '14 at 05:58
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I'd go with const ref. Const because the function shouldn't be changed and ref because then the function taking the parameter doesn't have to check for null.
But don't take my word for it, it will depend case by case. Here is a duplicate post that provides other perspectives:
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Better be careful with functions that captures some values or references. – diegoperini Jun 02 '14 at 09:05