TemporaryArrays

This package provides the macro @temparray, which allocates an array, for temporary use in a local scope.

Subsequent calls with the same signature (e.g. from the same line of code repeated in a loop) will be allocated the same array, without any extra allocations.

using TemporaryArrays
a1 = @temparray(Float64, (3,4), :same)
a2 = @temparray(Float64, (3,4), :same)
a3 = @temparray(Float64, (3,4), :different)

@assert eltype(a1) == Float64
@assert size(a1) == (3,4)
@assert a1 === a2
@assert a1 !== a3

The point is to be able to use "work variables" that persist and get re-used throughout a computation, but in a julianic and readable way.

In order for this to be worthy of the Julia registry:

• Figure out how to get this to work across multiple threads.

  Does Memoization.jl use the same cache for all threads? I don't know. If not, there's nothing to do. If it does, our macro should insert another symbol into the index, unique to the thread. Or, if that unavoidably incurs some allocation, I would be content to simply include an example in the README.