[Closures and SystemReflection]

Question

1.00/5 (1 vote)

See more:

I pass Event mechanism in MS, locking send / publish notification .I do not pass Concurrent Collection yet. Consider, as definition ask, Events as a certain particular type of Delegates.When invoke declared Delegate,the correspondent method is invoked.Assume that invocation is made for Annonymous Methods, but - code for method is recommanded to be expressed much more as Lambda Expression, Closures and Functors.- .So,I consider evaluating Closures with SystemReflection namespace.Intuitvly seems that SystemReflection offer all need stuff for this.Can Closures be somehow different evaluated?

Posted 10-Aug-13 1:55am

Member 8237823

Add a Solution

Comments

Sergey Alexandrovich Kryukov 11-Aug-13 0:15am

What is "pass even mechanism in MS"?! "Invoke declared Delegate"? "Method is recommanded"? "Evaluating Closures"? And so on...
It all leaves a strong impression of schizophasia, as if you had no idea what you are asking about.
Even if there is some rational grain in what you are trying to do, you are too far from expressing it in any conventional system of concepts.
—SA

BillWoodruff 11-Aug-13 6:31am

What specifically are you trying to do here ? What technical context is this question asked in: what libraries in C# are you using. What have you tried so far.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2013-08-10T18:11:00

Solution 1

You don't understand what a closure is, so this question makes no sense at all, as well as your goal.

Closure is not something which can be "evaluated". This is a union of a function with its reference environment. The essence of it is to allow the delegate to access the local variables even after the code creating the delegate instance goes out of the scope. In other words, closure is not some particular object you can obtain or access, this is, at the level of its implementation, a set of internal structures which supports the conception technically. You can read about it here: http://en.wikipedia.org/wiki/Closure_%28computer_science%29[^].

If you have some local (stack) variable which is referenced by some anonymous delegate instance, the code related to access to this variable is modified the way to provide access to its object for all the time when reachability of that delegate instance is kept in the application.

It's very easy to demonstrate the effect of a closure on a .NET example, but I'm not sure if you need that.

—SA

Posted 10-Aug-13 18:11pm

Sergey Alexandrovich Kryukov

Updated 10-Aug-13 18:19pm

v3

Comments

BillWoodruff 11-Aug-13 6:44am

Excellent answer, even if what the OP is asking cannot be understood :)

I'd really appreciate seeing an article on CP giving an overview of scope and persistence when using anonymous delegates, and other objects. And the relevance of the computer science concept of "closure" to C#, in theory, and practice.

Sergey Alexandrovich Kryukov 11-Aug-13 11:52am

Thank you, Bill.

It would be a great topic which I'm almost ready to cover to certain extent, as I thought about such article. So far, I only published a short section "On the nature of delegate instances" in my article on Dynamic Method Dispatcher. The main problem is: I already have full source code for two other articles which are waiting in a queue to be written...

—SA

BillWoodruff 12-Aug-13 11:16am

Well, SA, I still have a few years left, so waiting's not a problem for me. I do hope in your future articles you will keep in mind that, for some of us here, we may fit into the category implied by Marcus Aurelius, when he said: "Natural ability without education has more often raised a man to glory and virtue than education without natural ability." Just substitute "person" for "man" (to be politically correct); "sometimes" for "more often;" and, substitute "some level of technical understanding, and competence" for "glory and virtue" :) yours, Bill

Sergey Alexandrovich Kryukov 12-Aug-13 11:27am

Great.
(However, I would ask comrade Aurelius where that natural ability comes from. I have some ideas about it myself. :-)
Thank you, Bill.
—SA

BillWoodruff 12-Aug-13 13:34pm

I would trade a portion of my "soul" to have the chance to know Comrade Aurelius (knowing that knowing him would increase my soul far more, in quality, than it had before I gave away a portion of it). I'd like to learn from him what the inner qualities were that enabled him to experience both these "realities" simultaneously:

"The sexual embrace can only be compared with music and with prayer."

"Death is a release from the impressions of the senses, and from desires that make us their puppets, and from the vagaries of the mind, and from the hard service of the flesh."

I have ideas some about that, myselves :)

yours, Bill

Sergey Alexandrovich Kryukov 12-Aug-13 13:45pm

That is great!
—SA

Member 8237823 15-Aug-13 16:55pm

Interesting.I think about I want.I need time to write down/

Sergey Alexandrovich Kryukov 15-Aug-13 17:08pm

You are very welcome to do so. In terms of usage, this is not very hard, but there are delicate moments. I'll gladly share if you are interested.
—SA