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  • functional dependencies vs type families

    - by mhwombat
    I'm developing a framework for running experiments with artificial life, and I'm trying to use type families instead of functional dependencies. Type families seems to be the preferred approach among Haskellers, but I've run into a situation where functional dependencies seem like a better fit. Am I missing a trick? Here's the design using type families. (This code compiles OK.) {-# LANGUAGE TypeFamilies, FlexibleContexts #-} import Control.Monad.State (StateT) class Agent a where agentId :: a -> String liveALittle :: Universe u => a -> StateT u IO a -- plus other functions class Universe u where type MyAgent u :: * withAgent :: (MyAgent u -> StateT u IO (MyAgent u)) -> String -> StateT u IO () -- plus other functions data SimpleUniverse = SimpleUniverse { mainDir :: FilePath -- plus other fields } defaultWithAgent :: (MyAgent u -> StateT u IO (MyAgent u)) -> String -> StateT u IO () defaultWithAgent = undefined -- stub -- plus default implementations for other functions -- -- In order to use my framework, the user will need to create a typeclass -- that implements the Agent class... -- data Bug = Bug String deriving (Show, Eq) instance Agent Bug where agentId (Bug s) = s liveALittle bug = return bug -- stub -- -- .. and they'll also need to make SimpleUniverse an instance of Universe -- for their agent type. -- instance Universe SimpleUniverse where type MyAgent SimpleUniverse = Bug withAgent = defaultWithAgent -- boilerplate -- plus similar boilerplate for other functions Is there a way to avoid forcing my users to write those last two lines of boilerplate? Compare with the version using fundeps, below, which seems to make things simpler for my users. (The use of UndecideableInstances may be a red flag.) (This code also compiles OK.) {-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances, UndecidableInstances #-} import Control.Monad.State (StateT) class Agent a where agentId :: a -> String liveALittle :: Universe u a => a -> StateT u IO a -- plus other functions class Universe u a | u -> a where withAgent :: Agent a => (a -> StateT u IO a) -> String -> StateT u IO () -- plus other functions data SimpleUniverse = SimpleUniverse { mainDir :: FilePath -- plus other fields } instance Universe SimpleUniverse a where withAgent = undefined -- stub -- plus implementations for other functions -- -- In order to use my framework, the user will need to create a typeclass -- that implements the Agent class... -- data Bug = Bug String deriving (Show, Eq) instance Agent Bug where agentId (Bug s) = s liveALittle bug = return bug -- stub -- -- And now my users only have to write stuff like... -- u :: SimpleUniverse u = SimpleUniverse "mydir"

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  • Call a block method on an iterator: each.magic.collect { ... }

    - by blinry
    I have a class with a custom each-method: class CurseArray < Array def each_safe each.do |element| unless element =~ "fuck" yield element end end end end And want to call block methods on those "selected" elements. For example: curse_array.each_safe.magic.collect {|element| "#{element} is a nice sentence."} I know there is a way to do this, but I've forgotten. Please help! :-)

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  • Converting an empty string into nil in Ruby

    - by adi92
    I have a string called word and a function called infinitive such that word.infinitive would return another string on some occasions and an empty string otherwise I am trying to find an elegant ruby one line expression for the code-snippet below if word.infinitive == "" return word else return word.infinitive Had infinitive returned nil instead of "", I could have done something like (word.infinitive or word) But since it does not, I can't take advantage of the short-circuit OR Ideally I would want 1) a single expression that I could easily embed in other code 2) the function infinitive being called only once 3) to not add any custom gems or plugins into my code

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  • How to implement table-per-concrete-type strategy using entity framework

    - by SDReyes
    Hello Guys! I'm mapping a set of tables that share a common set of fields: So as you can see I'm using a table-per-concrete-type strategy to map the inheritance. But... I have not could to relate them to an abstract type containing these common properties. It's possible to do it using EF? BONUS: The only non documented Entity Data Model Mapping Scenario is Table-per-concrete-type inheritance http://msdn.microsoft.com/en-us/library/cc716779.aspx : P

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  • Calculation error in Datasheet view in SharePoint

    - by Marius
    I have a custom list, with calculation, in SharePoint. Everything worked fine until recently when the DataSheet will show strange or wrong % calculation in a % column. But the Standard View will show correct values. IT checked the server side and everything looked ok, I checked the formulas and even re-did them in the column and the issue persist. Anyone, any suggestion? Thanks,

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  • What is the default value for Empty Temporary Internet Files when browser is closed in IE8?

    - by schellack
    We have four different machines that all have "Empty Temporary Internet Files when browser is closed" set to true (checked) in IE8's Internet Options (located under the Security section in the Advanced tab). No one remembers checking that checkbox to turn on the setting. What is the default value supposed to be? I'm specifically interested in Windows 7 and Windows XP. I have run rsop.msc on one of the corporate machines—3 of the 4 are members of a corporate network/domain—and see this under User Configuration, which makes the current scenario seem even stranger: The Local Group Policy Editor (gpedit.msc) also shows the Configure Delete Browsing History on exit setting to be Not configured (under Computer ConfigurationAdministrative TemplatesWindows ComponentsInternet ExplorerDelete Browsing History).

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  • problem with Infopath web services

    - by AB
    I want to have some url for my infopath form and give that link to user instead of going to form library and click new...how is it possible? Also when I created Infopath form I have given some text fields and button, I don't want the Infopath services buttons(Save,save as...) how I cna remove those? Any suggestions would really be appreciated...Thanks

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  • Java: Is there a way to obtain the bytecode for a class at runtime?

    - by Adam Paynter
    In Java, is there a way (at runtime) to obtain the bytecode which defined a particular class? Put another way, is there a way to obtain the byte[] array passed to ClassLoader.defineClass(String name, byte[] b, int off, int len) when a particular class was loaded? I see that this method is declared final, so creating a custom ClassLoader to intercept class definitions seems out of the question. In the past, I have used the class's ClassLoader to obtain the bytecode via the getResourceAsStream(String) method, but I would prefer a more canonical solution.

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  • how to create media player on iphone?

    - by Jim
    I want to create my own media player. There is so much restriction with default media player control on iphone. I have written lots of applications using default media player. Now i want to write my own media player.If any one can give pointer from where to start to create custom media player. Thanks in advance. Jim.

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  • FlexScroll and IFRAMES

    - by Neurofluxation
    Hey, I was wondering whether there is a way to use FlexScroll (JavaScript custom image based scrollbars) with IFRAMES instead of the DIVS. Yes, I know scrollable DIVS are better than IFRAMES. This is my clients requirement though. Cheers.

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  • Upside down question mark issue

    - by Madhumita
    We have a very strange problem in out application, all of a sudden we started noticing upside down question marks being saved along with other text typed in to the fields on the screen. These upside down question marks were not originally entered by the users and it is unclear where they come from. We are using Oracle 10g with java. And this is happening, even when no data is copied from Microsoft Word

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  • Create and display indoor map on Android

    - by Lorenzo Barbagli
    I'm developing an Android application and I would like to display an internal (indoor) map of some buildings, but I don't know where to begin: I want to create a custom kml file (how it's possible to create it? with which tool?) and display it in a fragment. I already have it working with external maps (simple GoogleMap in MapFragment), so it would be super to have the kml file placed 'over' the GoogleMap, like real indoor maps. Thanks

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  • Google Analytics testing/sandbox environment?

    - by Laimoncijus
    Is there any Google Analytics testing/sandbox environment for testing your JS custom code before putting it to live system? I don't want to use my real tracking ID to see if everything is correct on my dev. environment, neither I want to put my code untested live... Is there any techniques or maybe some fake Analytics tracking lib I could use for testing?

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  • ahow can I resolve Django Error: str' object has no attribute 'autoescape'?

    - by Angelbit
    Hi have tried to create a inclusion tag on Django but don't work and return str' object has no attribute 'autoescape' this is the code of custom tag: from django import template from quotes.models import Quotes register = template.Library() def show_quote(): quote = Quotes.objects.values('quote', 'author').get(id=0) return {'quote': quote['quote']} register.inclusion_tag('quotes.html')(show_quote) EDIT: Quote class from django.db import models class Quotes(models.Model): quote = models.CharField(max_length=255) author = models.CharField(max_length=100) class Meta: db_table = 'quotes' quotes.html <blockquote id="quotes">{{ quote }}</blockquote>

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  • Table transformation / field parsing in PL/SQL

    - by IMHO
    I have de-normalized table, something like CODES ID | VALUE 10 | A,B,C 11 | A,B 12 | A,B,C,D,E,F 13 | R,T,D,W,W,W,W,W,S,S The job is to convert is where each token from VALUE will generate new record. Example: CODES_TRANS ID | VALUE_TRANS 10 | A 10 | B 10 | C 11 | A 11 | B What is the best way to do it in PL/SQL without usage of custom pl/sql packages, ideally with pure SQL? Obvious solution is to implement it via cursors. Any ideas?

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  • Uses for the capacity value of a string

    - by dreamlax
    In the C++ Standard Library, std::string has a public member function capacity() which returns the size of the internal allocated storage, a value greater than or equal to the number of characters in the string (according to here). What can this value be used for? Does it have something to do with custom allocators?

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  • Incoming Mails in Sharepoint

    - by frbry
    Hello all, I have a Document Library that receives a mail every week. I want to show the list of mails with their summaries. Is it possible to get that mail's content in Sharepoint, without deploying a custom code? Thanks.

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  • Adding cygwin on right click on windows explorer

    - by PushpRaj
    I wish to add a command on right click menu in explorer that opens current directory with cygwin. For same I have successfully added these registries: [HKEY_CURRENT_USER\software\classes\directory\shell\cygwin] @="c:\\cygwin\\bin\\bash.exe --login -i -c \"cd '%1'; bash\"" [HKEY_CURRENT_USER\software\classes\drive\shell\cygwin] @="c:\\cygwin\\bin\\bash.exe --login -i -c \"cd '%1'; bash\"" but this adds the command only when on some folder or drive. I want generic right click on explorer, on which, search gives me this registry to edit: [HKEY_CLASSES_ROOT\Directory\Background\shell\cygwin] @="c:\\cygwin\\bin\\bash.exe --login -i -c \"cd '%1'; bash\"" My problem lies with the value of the key, which doesnt work on %1 but on some static value like /cygdrive/c Could someone please tell me the proper way to pass current directory to the command, also please refer me some basic and advanced pages for same. Thank you.

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  • Excel 2007: Filtering out rows in a table based on a list

    - by Sam Johnson
    I have a large table that looks like this: ID String 1 abcde 2 defgh 3 defgh 4 defgh 5 ijkl 6 ijkl 7 mnop 8 qrst I want to selectivley hide rows by populating a list of filterd values. For example, I'd like to filter out (hide) all rows that contain 'ef', 'kl', and 'qr'. Is there an easy way to do this? I know how to use Advanced filters to include only the rows that contain those substrings, but not the inverse. Has anyone does this before?

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  • Why does Public Folder share prompt for password even after I set "Turn off password protected sharing"

    - by cmaduro
    I have a fileserver on a WORKGROUP which I have created a share on. I have turned on public folder sharing, file and printing sharing and set password protected sharing to off. When I try to share the folder by right clicking it and selecting proerties, then selecting sharing tab, then clicking the "share" button, then clicking share, it prompts me asking wether or not I want to turn on network discovery for public network, and after I say either yes or no, it says that my folder cant be shared. When I try to share via advanced sharing, then the folder is shared, and it's status is set to shared. However when I try to access this folder from a computer on the same network, it prompts me to enter a username and password. I am trying to setup a share for my VMware ThinApp packages that can be access no matter what domain the users are on.

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  • jquery cycle not working/playing in IE7

    - by user202141
    got the jq cycle plugin to work nicely on all the other major browsers, but IE7 just shows the first nested element (an img with a anchor wrapped around it) with no fade/animation. http://alitedesigns.com/ I checked for trailing commas after the custom attributes for cycle, any thoughts on why IE won't play nice? thanks!

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