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Why are async state machines classes (and not structs) in Roslyn?


Why are async state machines classes (and not structs) in Roslyn?

By : horatiobates
Date : November 20 2020, 09:01 AM
This might help you I didn't have any foreknowledge of this, but since Roslyn is open-source these days, we can go hunting through the code for an explanation.
And here, on line 60 of the AsyncRewriter, we find:
code :
// The CLR doesn't support adding fields to structs, so in order to enable EnC in an async method we need to generate a class.
var typeKind = compilationState.Compilation.Options.EnableEditAndContinue ? TypeKind.Class : TypeKind.Struct;


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Are F#'s async state machines the same as C#'s async or go-lang's go command?

Are F#'s async state machines the same as C#'s async or go-lang's go command?


By : David Albalate Cabed
Date : March 29 2020, 07:55 AM
will help you It's not exactly the same, no, but C# also uses state machines to build the async versions of methods on compilation.
See http://msdn.microsoft.com/en-us/magazine/hh456403.aspx for a great article by Mads Torgersen about how methods are rewritten in the compiler for C#'s async token.
Why are Awaiters (async/await) structs and not classes? Can classes be used?

Why are Awaiters (async/await) structs and not classes? Can classes be used?


By : tianfanfan
Date : March 29 2020, 07:55 AM
To fix the issue you can do The reason behind making awaitables a struct is to avoid unnecessary heap allocations and minimize the memory footprint when the compiler creates the state machine behind the scenes.
This is an implementation detail. It is not necessary for an awaitable to be of type struct and not a class. To strengthen this statement, try compiling an async method in Roslyn in Debug mode, and you'll see the state-machine is a class, where-as compiling in Release will result in a struct. More on that in Why are async state machines classes (and not structs) in Roslyn?
Rails and the state_machine gem. Using callbacks in namespaced state machines to trigger events in in other machines

Rails and the state_machine gem. Using callbacks in namespaced state machines to trigger events in in other machines


By : Prakash M
Date : March 29 2020, 07:55 AM
hope this fix your issue Like the title says, I am using the state machine gem to create multiple, namespaced state machines on one model. When one of my state machines transitions to a specific state, I am trying to use a callback to trigger an event in a separate state machine on that same model but am getting an error. , Try the following:
code :
class Status < ActiveRecord::Base
  belongs_to :project

  ######### First Machine #########
  state_machine :first_machine, initial: :first_pending, :namespace => 'first' do
    after_transition any => :finished do |status, transition|
      status.start_the_second_state_machine
    end

    event :complete do
      transition first_pending: :finished
    end
  end

  ######### Second Machine #########
  state_machine :second_machine, initial: :unstarted, :namespace => 'second' do
    event :start_the_second_state_machine do
      transition unstarted: :started
    end
  end
end
How to model two interacting state machines of two different classes?

How to model two interacting state machines of two different classes?


By : Phillip Weber
Date : March 29 2020, 07:55 AM
Does that help You can send events between classes to trigger transitions, something like this, for example:
State Machines, Sub-Classes, and Function Pointers

State Machines, Sub-Classes, and Function Pointers


By : Joan Carreras
Date : March 29 2020, 07:55 AM
wish of those help There aren't any function pointers in your example. Also, like Marciej, I am able to compile (and run) this code.
But, since you asked, the 'have0' declaration simply declares an instance of the class. A class definition can be followed by 0 or more of these declarations (as well as initializers):
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