logo
down
shadow

How to express inheritance in Coq?


How to express inheritance in Coq?

Content Index :

How to express inheritance in Coq?
Tag : development , By : Dasharath Yadav
Date : November 24 2020, 03:01 PM

I think the issue was by ths following , You seem to be asking about how to compute the closure of a function under repeated function application. The key to the problem is to find a way to ensure termination, i.e., a way to determine the maximum number of times the function might be called. In this case, an easy upper bound is List.length l; an element cannot have more transitive-parents than there are generations. Using this insight, we can define a function that takes a list of numbers, and outputs a list of those numbers together with all of their parents, and then we apply this function List.length l times to itself, starting with parents of c:
Require Import Coq.Lists.List. Import ListNotations.
Require Import Coq.Sorting.Mergesort. Import NatSort.
Scheme Equality for nat.
Inductive Gen : Set :=
| BGen : nat -> nat -> Gen.

Definition g1 := BGen 1 2.
Definition g2 := BGen 2 3.


Fixpoint parents (l : list Gen) (c : nat) :=
  match l with
  | [] => []
  | (BGen p c') :: l' => if nat_beq c c'
                         then [p]
                         else parents l' c
  end.

Fixpoint deduplicate' (ls : list nat) :=
  match ls with
  | [] => []
  | x :: [] => [x]
  | x :: ((y :: ys) as xs)
    => if nat_beq x y
       then deduplicate' xs
       else x :: deduplicate' xs
  end.
Definition deduplicate (ls : list nat) := deduplicate' (sort ls).

Definition parents_step (l : list Gen) (cs : list nat) :=
  deduplicate (cs ++ List.flat_map (parents l) cs).

Fixpoint all_parents' (l : list Gen) (cs : list nat) (fuel : nat) :=
  match fuel with
  | 0 => cs
  | S fuel'
    => all_parents' l (parents_step l cs) fuel'
  end.
Definition all_parents (l : list Gen) (c : nat) :=
  deduplicate (all_parents' l (parents l c) (List.length l)).

Definition gs := (g1::g2::nil).

Compute all_parents gs 3. (* [1; 2] *)

Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Different notations to express inheritance


Tag : generics , By : noboruwatanabe
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Well, there is nothing stopping Scala from doing so, but, as a matter of fact, they do not express the same thing at all. And, in fact, you can see that in Java, where you can write X super Y, but you can't say class X super Y.
The keyword extends express a relationship between classes, one of inheritance. On the other hand, <: and >: express a relationship between types, one of boundaries. When I say X <: Y, then it is valid for both X and Y to be String, for example, while String extends String would be meaningless. It is also the case that List[String] <: List[AnyRef], though, again, List[String] extends List[AnyRef] is meaningless. And, just to make the point, it is not true that Set[String] <: Set[AnyRef]. In all these examples I just gave we are talking about the same class, but not, necessarily, about the same type.

In Scala is there a nicer a way to express the following inheritance?


Tag : scala , By : tanminivan
Date : March 29 2020, 07:55 AM
To fix this issue In my base class I have , For example,
def singleword(fOnStart: Start => Unit) =
  new EventReceiver {
    override def onStart(start: Start) { fOnStart(start) }
  }
singleword { start =>
  println("benchmark started")
}

Multiple inheritance in C++: What is the good way to express the diagram in C++ with multiple inheritance?


Tag : cpp , By : user98986
Date : March 29 2020, 07:55 AM
it helps some times This is pseudo code but should illustrate the hierarchy:
Solution 1:
class IBaseInterface {}

class Base : IBaseInterface {}

class Child1 : Base {}

class Child2 : Base {}
class IChildInterface {}

class Base {}

class Child1 : Base, IChildInterface  {}

class Child2 : Base, IChildInterface  {}

Jade template inheritance without Express


Tag : node.js , By : CodeOfficer
Date : March 29 2020, 07:55 AM
I wish this help you You don't need Express at all to use Jade's Template inheritance; you only need Jade:
// app.js
var jade = require('jade');

var options = { pretty: true, locals: {} };

jade.renderFile(__dirname + '/home.jade', options, function (err, html) {
    console.log(html);
});
// home.jade
extends core

block body
  h1 Home
// core.jade
doctype html
html
  head
    meta(charset='utf-8')
    title Foo
  body
    block body

OOP Inheritance in Express router


Tag : javascript , By : Mike
Date : March 29 2020, 07:55 AM
wish helps you The idiomatic way to do this with Express is to use middleware for the common bits and reuse that middleware in your routes. For example, this middleware can take care of parsing the project data:
function parseProject(req, res, next) {
  res.locals.project = JSON.parse(req.body.data);
  req.files.forEach((item) => {
    res.locals.project[item.fieldname] = '/' + item.path;
  })
  next();
}
const projectRouter = express.Router();
projectRouter
  .use(upload.any())
  .use(parseProject)
  .put('/:id', putProject)
  .post('/:id', postProject);

app.use('/projects', projectRouter);
Related Posts Related QUESTIONS :
  • mailto link for large bodies
  • Is it just me, or are characters being rendered incorrectly more lately?
  • How do I create an HTML anchor in a FogBugz wiki page?
  • Sleep from within an Informix SPL procedure
  • License Models
  • Rational Purify failing to jump to memory leaks
  • Telligent's Community Server
  • Do people use the Hungarian Naming Conventions in the real world?
  • Memcached chunk limit
  • How do you pull the URL for an ASP.NET web reference from a configuration file in Visual Studio 2008?
  • How to add CVS directories recursively
  • Web App Beta
  • Virtual machine supporting multiple displays
  • LINQ to SQL strings to enums
  • How do I configure eclipse (zend studio 6) to hint and code complete several languages?
  • Recommended Fonts for Programming?
  • Automating VMWare or VirtualPC
  • How do I use more than one OpenID?
  • Domain Specific Language resources
  • Vista or XP for Dev Machine
  • Where can I get the Windows Workflow "wca.exe" application?
  • How to learn ADO.NET
  • What is a good barebones CMS or framework?
  • What's the Developer Express equivalent of System.Windows.Forms.LinkButton?
  • Is it acceptable for invalid XHTML?
  • Anyone soloing using fogbugz?
  • Using MBUnit in TeamCity
  • How to setup a crontab to execute at specific time
  • Linking two Office documents
  • How can I detect if a browser is blocking a popup?
  • Apply filter to t-foreach
  • Lotus Notes convert formula to agent
  • Problem with configuration of odoo for working with pycharm
  • Unexpected number of arguments when calling EM_JS function
  • What does the function state_fidelity() do in Qiskit?
  • Azure function with IoT Hub trigger get send device
  • Cluster similar words using word2vec
  • Add elements into an array then find distinct,
  • Angular8 - error TS2304: Cannot find name
  • Manually polling streams in future implementation
  • How do you perform receipt validation for Android on Xamarin Forms
  • What is the rule behind instruction count in Intel PIN?
  • How to draw some text when click a button in wxWidgets?
  • Restrict entity types in Spacy NER
  • How to animate CN1 Slider progress on load
  • Issue with bwa mem process not running on all output files from previous process
  • Delete videos from playlist using YouTube API
  • How to restart the Hyperledger Composer Playground locally
  • How to configure email alerts in Zabbix Server?
  • Simulator is not working for smart home action with all configured session
  • How parse data using join on Objection.js
  • Assign an array to a property in a Chapel Class
  • Netlogo: How can I obtain the accumulate value in Netlogo?
  • How to populate datasource for listview using api response in react native?
  • Why does gmail API when using history.list method send message ids without the field what action has been preformed on t
  • How to run an append query in ms access vba as part of a transaction
  • Wrong dates shown in Jekyll-based blog
  • How to concatenate two document lists in a webMethods flow service?
  • How to properly set up a site map addition in a customization project
  • IBM Content Collector error calling external Web Service
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com