A shortlived fork of ResumableFunctions -- all changes are now upstreamed to the original and the original is now actively maintained once more.

Semicoroutines

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C# has a convenient way to create iterators using the yield return statement. The package Semicoroutines provides the same functionality for the Julia language by introducing the @resumable and the @yield macros. These macros can be used to replace the Task switching functions produce and consume which were deprecated in Julia v0.6. Channels are the preferred way for inter-task communication in julia v0.6+, but their performance is subpar for iterator applications. See the benchmarks section below.

Semicoroutines.jl is a fork Ben Lauwens' of ResumableFunctions.jl.

using Semicoroutines

@resumable function fibonacci(n::Int) :: Int
  a = 0
  b = 1
  for i in 1:n
    @yield a
    a, b = b, a+b
  end
end

for fib in fibonacci(10)
  println(fib)
end

Caveats

• In a try block only top level @yield statements are allowed.
• In a finally block a @yield statement is not allowed.
• An anonymous function can not contain a @yield statement.