christineponyl

actor Main
  
  new create(env: Env) =>
    env.out.print(fib(5).string())
    
  fun fib(n: U64): U64 =>
    match n
    | 0 => 0
    | 1 => 1
  else

christineponyl

// how to send snapshot of values from mutable container field to another actor

use "itertools"
use mut = "collections"
use "collections/persistent"

actor Receiver
  let env: Env
  new create(env': Env) =>  
    env = env'

christineponyl

// pass a copy of a (portion of) mutable array to another actor
// original array must be iso, trn or ref (#mutable)
// send as iso or val

// 1.  iso copy-by-value to val
// 2.  iso -> "make a copy" -> recover to val
// 3.  ref -> clone -> recover to val

use "itertools"
use "collections"

christineponyl

actor Main
  new create(env: Env) =>
    try
      let foo = Foo.create()?
      something_else(foo)
    else
      env.err.print("Something went wrong!")
      env.exitcode(1)
    end
  

christineponyl

actor Main
  let foo: (Foo|None)
  new create(env: Env) =>
    try
      foo = Foo()?
    else
      env.err.print("Something went wrong!")
      env.exitcode(1)
    end
    

christineponyl

actor Main
  let foo: Foo
  new create(env: Env) =>
    try
      foo = Foo()?
    else
      env.err.print("Something went wrong!")
      env.exitcode(1)
    end

christineponyl

use "collections"

// the refcap of the Printer class constructor:
// if declared as iso, trn, or val, compiler demands sendable parameters
// if declared as ref or box, the compiler accepts the non-sendable parameter (box in this case)

class Printer
  let env: Env
  new val create(env':Env, arr:Array[USize] iso) =>  
    env = env'

christineponyl

use "collections"

// the refcap of the Printer class constructor:
// if declared as iso, trn, or val, compiler demands sendable parameters
// if declared as ref or box, the compiler accepts the non-sendable parameter (box in this case)

class Printer
  let env: Env
  new val create(env':Env, arr:Array[USize] box) =>  
    env = env'

christineponyl

use "collections"

class Printer
  let env: Env
  new val create(env':Env, arr:Array[USize] box) =>
    env = env'
    try
      env.out.print(arr(4)?.string())
    else
      env.out.print("index out of range")

christineponyl

actor Main
  new create(env: Env) =>
    env.out.print("Hello, world!")