Preallocating and returning anonymous function

General Usage Performance
3

Maybe a callable struct would be simpler here?

struct ActOnA{B}
  buffer::B
end

# define what happens when we use an ActOnA object like a function
function (b::ActOnA)(A)
  return acting_on_A_using_B_as_buffer(A, b.buffer)
end

act_on_A = ActOnA(similar(A)) # create buffer object
act_on_A(A) # call buffer object

Looks like the above poster beat me to this suggestion, but I’m still posting this for the snippet.

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