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  • What are the main benefits of implementing a virtual machine as part of an application?

    - by Marplesoft
    Several databases I've been looking at recently implement a virtual machine internally to perform the respective data reads and writes. For an example, check out this article on SQLite's virtual machine they call the 'VDBE'. I'm curious as to what the benefits of such an architecture are. I would assume performance is one but why would a virtual machine like this run faster? In fact, it seems to be that this extra layer could cause it to run slower. So perhaps it's for security? Or portability? Anyway, just curious about this.

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  • Implementing a Custom Coherence PartitionAssignmentStrategy

    - by jpurdy
    A recent A-Team engagement required the development of a custom PartitionAssignmentStrategy (PAS). By way of background, a PAS is an implementation of a Java interface that controls how a Coherence partitioned cache service assigns partitions (primary and backup copies) across the available set of storage-enabled members. While seemingly straightforward, this is actually a very difficult problem to solve. Traditionally, Coherence used a distributed algorithm spread across the cache servers (and as of Coherence 3.7, this is still the default implementation). With the introduction of the PAS interface, the model of operation was changed so that the logic would run solely in the cache service senior member. Obviously, this makes the development of a custom PAS vastly less complex, and in practice does not introduce a significant single point of failure/bottleneck. Note that Coherence ships with a default PAS implementation but it is not used by default. Further, custom PAS implementations are uncommon (this engagement was the first custom implementation that we know of). The particular implementation mentioned above also faced challenges related to managing multiple backup copies but that won't be discussed here. There were a few challenges that arose during design and implementation: Naive algorithms had an unreasonable upper bound of computational cost. There was significant complexity associated with configurations where the member count varied significantly between physical machines. Most of the complexity of a PAS is related to rebalancing, not initial assignment (which is usually fairly simple). A custom PAS may need to solve several problems simultaneously, such as: Ensuring that each member has a similar number of primary and backup partitions (e.g. each member has the same number of primary and backup partitions) Ensuring that each member carries similar responsibility (e.g. the most heavily loaded member has no more than one partition more than the least loaded). Ensuring that each partition is on the same member as a corresponding local resource (e.g. for applications that use partitioning across message queues, to ensure that each partition is collocated with its corresponding message queue). Ensuring that a given member holds no more than a given number of partitions (e.g. no member has more than 10 partitions) Ensuring that backups are placed far enough away from the primaries (e.g. on a different physical machine or a different blade enclosure) Achieving the above goals while ensuring that partition movement is minimized. These objectives can be even more complicated when the topology of the cluster is irregular. For example, if multiple cluster members may exist on each physical machine, then clearly the possibility exists that at certain points (e.g. following a member failure), the number of members on each machine may vary, in certain cases significantly so. Consider the case where there are three physical machines, with 3, 3 and 9 members each (respectively). This introduces complexity since the backups for the 9 members on the the largest machine must be spread across the other 6 members (to ensure placement on different physical machines), preventing an even distribution. For any given problem like this, there are usually reasonable compromises available, but the key point is that objectives may conflict under extreme (but not at all unlikely) circumstances. The most obvious general purpose partition assignment algorithm (possibly the only general purpose one) is to define a scoring function for a given mapping of partitions to members, and then apply that function to each possible permutation, selecting the most optimal permutation. This would result in N! (factorial) evaluations of the scoring function. This is clearly impractical for all but the smallest values of N (e.g. a partition count in the single digits). It's difficult to prove that more efficient general purpose algorithms don't exist, but the key take away from this is that algorithms will tend to either have exorbitant worst case performance or may fail to find optimal solutions (or both) -- it is very important to be able to show that worst case performance is acceptable. This quickly leads to the conclusion that the problem must be further constrained, perhaps by limiting functionality or by using domain-specific optimizations. Unfortunately, it can be very difficult to design these more focused algorithms. In the specific case mentioned, we constrained the solution space to very small clusters (in terms of machine count) with small partition counts and supported exactly two backup copies, and accepted the fact that partition movement could potentially be significant (preferring to solve that issue through brute force). We then used the out-of-the-box PAS implementation as a fallback, delegating to it for configurations that were not supported by our algorithm. Our experience was that the PAS interface is quite usable, but there are intrinsic challenges to designing PAS implementations that should be very carefully evaluated before committing to that approach.

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  • How do I mount a virtual filesystem in a folder?

    - by chacham15
    I implemented a virtual filesystem using Dokan. I tried to set the drive letter to C but it errors every time. I was wondering if there is a different virtual filesystem which will allow me to do that or if there is a way of fixing it. Is there some windows api call which will allow me to remount the filesystem in a folder? Thanks!!! EDIT: The windows manager does not list the virtual drive, so I cannot mount it through the usual Windows interface. Also, I tried to change the drive name through the property interface and it wouldnt let me do that either.

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  • Implementation of recurring fee system

    - by TPSstar
    I'm developing an application which will list members who have not paid their any previous month's fee and a separate list for those who have paid the fee. So, lets say a member who will be paying fee through out the year, each month and if he didn't pay fee for march 2013 then app should highlight him as un-paid member. What would be best practice to achieve it. Adding fee invoices for whole year already in database when member is added then loop through his payments to check if fee is paid or not, or add a validation date for member on his each payment, for example payment made in Feb 2013 then member is valid till 28.02.2013. Check if date today is 28.02.2013 then he has not paid..

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  • How to overwrite virtual fnc in good style? [C++]

    - by atch
    Hi, guys I know this question is very basic but I've met in few publications (websites, books) different style of overwriting virtual function. What I mean is: if I have base class: class Base { public: virtual void f() = 0; }; in some publications I saw that to overwrite this some authors would just say: void f(); and some would still repeat the virtual keyword before void. Which form of overwriting is in good style? Thank you for your answers.

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  • Where should I start with debugging my exchange server?

    - by joadha
    I'm (foolishly?) attempting to install Exchange on top of Windows Server 2008 (64-bit) over Virtual Box running on Mac OSX Lion. Everything went smoothly until I got to the "Readiness Checks" tab. Readiness failed spectacularly on Hub Transport Role and Mailbox Role prereqs. Before I go too far down the rabbit hole in attempting to remedy this, I was hoping I could get some input on where to start in all of this. I already set up the following Active Directory roles, but it didn't seem to help: Active Directory Domain Services Active Directory Lightweight Directory Services I also enabled an Application Server role. Those three are the only roles I've set up-- I cannot locate within Server Manager the Organization Manager role or any of the other roles referenced in the list of borkedness below. Is this a typical experience in Exchange installation? Is there a tutorial created by somebody outside of Microsoft? Here's the output from Readiness Checks: Summary: 5 item(s). 2 succeeded, 3 failed. Elapsed time: 00:00:53 Configuring Prerequisites Completed Elapsed Time: 00:00:00 Languages Prerequisites Completed Elapsed Time: 00:00:09 Hub Transport Role Prerequisites Failed Error: Active Directory does not exist or cannot be contacted. Click here for help... http://go.microsoft.com/fwlink/? linkid=30939&l=en&v=ExBPA.14&id=51e5500d-8b18-4eee-bb8e-925d063b60a1 Error: You must be a member of the 'Organization Management' role group or 'Enterprise Admins' group to continue. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=1d750594-9222-44d7-8f80-45e522e889e6 Error: Setup encountered a problem while validating the state of Active Directory: Could not find information about the local domain. Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Error: You must be logged on as an Exchange organization administrator to install or upgrade the first Hub Transport server role in the topology. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=e58f51fd-2c66-4a4b-914a-628dccf9a09f Error: The 'IIS 6 Metabase Compatibility' component is not installed. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=0a71c4f6-68de-40f7-94cf-74b73cbda37b Error: The 'IIS 7 Basic Authentication' component required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 Windows Authentication' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 .NET Extensibility' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=5f29a861-f472-4f11-a23a-04155373f5ed Error: This computer is not part of a Windows domain. Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Error: The user is not logged on to a Windows domain Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Warning: This computer requires the Microsoft Office 2010 Filter Packs. Please install the software from http://go.microsoft.com/fwlink/?LinkID=191548 Warning: The 'IIS 6 Management Console' component is recommended as it allows for the administration of all server roles. Install the component via Server Manager. Warning: Setup cannot verify that the 'Host' (A) record for this computer exists within the DNS database on server 10.1.10.1. Elapsed Time: 00:00:15 Client Access Role Prerequisites Failed Error: Active Directory does not exist or cannot be contacted. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=51e5500d-8b18-4eee-bb8e-925d063b60a1 Error: Unable to read data from the Metabase. Ensure that Microsoft Internet Information Services is installed. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=a4a4d339-4009-4fb7-b842-ca2ba79f13f0 Error: The World Wide Web (W3SVC) service is either disabled or not installed on this computer. You must exit Setup, install the required component, then restart the Setup process. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=9eeaa77f-4d46-4d9a-9c36-f262a075392b Error: You must be a member of the 'Organization Management' role group or 'Enterprise Admins' group to continue. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=1d750594-9222-44d7-8f80-45e522e889e6 Error: Setup encountered a problem while validating the state of Active Directory: Could not find information about the local domain. Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Error: You must be logged on as an Exchange organization administrator to install or upgrade the first Client Access server role in the topology. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=e58f51fd-2c66-4a4b-914a-628dccf9a09f Error: The 'IIS 6 Metabase Compatibility' component is not installed. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=0a71c4f6-68de-40f7-94cf-74b73cbda37b Error: The 'IIS 6 Management Console' component is not installed. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=0a71c4f6-68de-40f7-94cf-74b73cbda37b Error: The 'IIS 7 Dynamic Content Compression' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/? linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 Static Content Compression' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 Basic Authentication' component required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 Windows Authentication' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 Digest Authentication' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 .NET Extensibility' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=5f29a861-f472-4f11-a23a-04155373f5ed Error: This computer is not part of a Windows domain. Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Error: The user is not logged on to a Windows domain Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Warning: Setup cannot verify that the 'Host' (A) record for this computer exists within the DNS database on server 10.1.10.1. Elapsed Time: 00:00:14 Mailbox Role Prerequisites Failed Error: Active Directory does not exist or cannot be contacted. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=51e5500d-8b18-4eee-bb8e-925d063b60a1 Error: Unable to read data from the Metabase. Ensure that Microsoft Internet Information Services is installed. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=a4a4d339-4009-4fb7-b842-ca2ba79f13f0 Error: The World Wide Web (W3SVC) service is either disabled or not installed on this computer. You must exit Setup, install the required component, then restart the Setup process. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=9eeaa77f-4d46-4d9a-9c36-f262a075392b Error: You must be a member of the 'Organization Management' role group or 'Enterprise Admins' group to continue. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=1d750594-9222-44d7-8f80-45e522e889e6 Error: Setup encountered a problem while validating the state of Active Directory: Could not find information about the local domain. Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Error: You must be logged on as an Exchange organization administrator to install or upgrade the first Mailbox server role in the topology. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=e58f51fd-2c66-4a4b-914a-628dccf9a09f Error: The 'IIS 6 Metabase Compatibility' component is not installed. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=0a71c4f6-68de-40f7-94cf-74b73cbda37b Error: The 'IIS 6 Management Console' component is not installed. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=0a71c4f6-68de-40f7-94cf-74b73cbda37b Error: The 'IIS 7 Basic Authentication' component required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 Windows Authentication' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=41a25c5e-0d39-4e55-a1f0-7be885982236 Error: The 'IIS 7 .NET Extensibility' component is required. Install the component via Server Manager. Click here for help... http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.14&id=5f29a861-f472-4f11-a23a-04155373f5ed Error: This computer is not part of a Windows domain. Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Error: The user is not logged on to a Windows domain Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex28883C&l=0&cl=cp Warning: This computer requires the Microsoft Office 2010 Filter Packs. Please install the software from http://go.microsoft.com/fwlink/?LinkID=191548 Warning: Setup cannot verify that the 'Host' (A) record for this computer exists within the DNS database on server 10.1.10.1. Elapsed Time: 00:00:14

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  • (iphone) How to access CGRect member variable inside c++ class?

    - by Eugene
    i have a c++ class with CGrect variable and i'm getting segfault when trying to access it. class Parent { //with some virtual functions/dtors }; class Child { public: void SetRect(CGRect rect) { mRect = rect; } CGRect GetRect() { return mRect; } int GetIndex() { return mIndex; } private: CGRect mRect; int mIndex; }; i'm doing CGRect rect = childPtr->GetRect(); from object c code and it segfaults. I printed *childPtr just before the call and rect looks fine with intended data value. int index = childPtr->GetIndex(); from same object c code(*.mm), works fine though. Any idea why I'm getting segfaults? Thank you edit - It's got something to do with virtual functions. (gdb) p singlePuzzlePiece-GetRect() Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_PROTECTION_FAILURE at address: 0x00000001 0x00000001 in ?? () Cannot access memory at address 0x1 The program being debugged was signaled while in a function called from GDB. GDB remains in the frame where the signal was received. To change this behavior use "set unwindonsignal on" Evaluation of the expression containing the function (at 0x1) will be abandoned. (gdb) Somehow, the function is not properly compiled?

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  • F#: Advantages of converting top-level functions to member methods?

    - by J Cooper
    Earlier I requested some feedback on my first F# project. Before closing the question because the scope was too large, someone was kind enough to look it over and leave some feedback. One of the things they mentioned was pointing out that I had a number of regular functions that could be converted to be methods on my datatypes. Dutifully I went through changing things like let getDecisions hand = let (/=/) card1 card2 = matchValue card1 = matchValue card2 let canSplit() = let isPair() = match hand.Cards with | card1 :: card2 :: [] when card1 /=/ card2 -> true | _ -> false not (hasState Splitting hand) && isPair() let decisions = [Hit; Stand] let split = if canSplit() then [Split] else [] let doubleDown = if hasState Initial hand then [DoubleDown] else [] decisions @ split @ doubleDown to this: type Hand // ...stuff... member hand.GetDecisions = let (/=/) (c1 : Card) (c2 : Card) = c1.MatchValue = c2.MatchValue let canSplit() = let isPair() = match hand.Cards with | card1 :: card2 :: [] when card1 /=/ card2 -> true | _ -> false not (hand.HasState Splitting) && isPair() let decisions = [Hit; Stand] let split = if canSplit() then [Split] else [] let doubleDown = if hand.HasState Initial then [DoubleDown] else [] decisions @ split @ doubleDown Now, I don't doubt I'm an idiot, but other than (I'm guessing) making C# interop easier, what did that gain me? Specifically, I found a couple *dis*advantages, not counting the extra work of conversion (which I won't count, since I could have done it this way in the first place, I suppose, although that would have made using F# Interactive more of a pain). For one thing, I'm now no longer able to work with function "pipelining" easily. I had to go and change some |> chained |> calls to (some |> chained).Calls etc. Also, it seemed to make my type system dumber--whereas with my original version, my program needed no type annotations, after converting largely to member methods, I got a bunch of errors about lookups being indeterminate at that point, and I had to go and add type annotations (an example of this is in the (/=/) above). I hope I haven't come off too dubious, as I appreciate the advice I received, and writing idiomatic code is important to me. I'm just curious why the idiom is the way it is :) Thanks!

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  • When should a member function have a const qualifier and when shouldn't it?

    - by SCFrench
    About six years ago, a software engineer named Harri Porten wrote this article, asking the question, "When should a member function have a const qualifier and when shouldn't it?" I found it to be the best write-up I could find of the issue, which I've been wrestling with more recently and which I think is not well covered in most discussions I've found on const correctness. Since a software information-sharing site as powerful as SO didn't exist back then, I'd like to resurrect the question here.

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  • How to specify a route member inside a block in Rails?

    - by yuval
    The following code: map.resources :users, :has_many => :items Could be written like this in a block: map.resources :users do |user| user.resources :items end How could I write the following code in a block? map.resources :users, :member => { :start => :post } Also, where could I find documentation on writing routes in blocks? The Routes Documentation does not seem to show it. Thank you!

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  • How to have member variables and public methods in a jQuery plugin?

    - by user169867
    I'm trying to create a jQuery plugin that will create something like an autoCompleteBox but with custom features. How do I store member variables for each matching jQuery element? For example I'll need to store a timerID for each. I'd also like to store references to some of the DOM elements that make up the control. I'd like to be able to make a public method that works something like: $("#myCtrl").autoCompleteEx.addItem("1"); But in the implementation of addItem() how can I access the member variables for that particular object like its timerID or whatever? Below is what I have so far... Thanks for any help or suggestions! (function($) { //Attach this new method to jQuery $.fn.autoCompleteEx = function(options) { //Merge Given Options W/ Defaults, But Don't Alter Either var opts = $.extend({}, $.fn.autoCompleteEx.defaults, options); //Iterate over the current set of matched elements return this.each(function() { var acx = $(this); //Get JQuery Version Of Element (Should Be Div) //Give Div Correct Class & Add <ul> w/ input item to it acx.addClass("autoCompleteEx"); acx.html("<ul><li class=\"input\"><input type=\"text\"/></li></ul>"); //Grab Input As JQ Object var input = $("input", acx); //Wireup Div acx.click(function() { input.focus().val( input.val() ); }); //Wireup Input input.keydown(function(e) { var kc = e.keyCode; if(kc == 13) //Enter { } else if(kc == 27) //Esc { } else { //Resize TextArea To Input var width = 50 + (_txtArea.val().length*10); _txtArea.css("width", width+"px"); } }); }); //End Each JQ Element }; //End autoCompleteEx() //Private Functions function junk() { }; //Public Functions $.fn.autoCompleteEx.addItem = function(id,txt) { var x = this; var y = 0; }; //Default Settings $.fn.autoCompleteEx.defaults = { minChars: 2, delay: 300, maxItems: 1 }; //End Of Closure })(jQuery);

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  • Using static vs. member find method on a STL set?

    - by B Johnson
    I am using a set because, i want to use the quick look up property of a sorted container such as a set. I am wondering if I have to use the find member method to get the benefit of a sorted container, or can I also use the static find method in the STL algorithms? My hunch is that using the static version will use a linear search instead of a binary search like I want.

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  • Is there a way to make a serialized member to serialize as an attribute?

    - by Shimmy
    Is there a way to make a serialized member to serialize as an attribute: <Serializable> Public Class Person Public Property Name As String End Class I want than when this class is xml-serialized, it should produce: <Person Name="John Doe" /> And what I mean is that instead of the Name property should be serialized as an element, it should be serialized as an xml attribute.

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  • CRM 2011 - How to update Marketing List Member Type options to reflect entity display name changes?

    - by jwood
    Is there a way of updating the Option Set options for the Marketing List Member Type to reflect an entity display name change? i.e. if the account entity has been renamed to organisation, is there a supported way of reflecting this in the displayed options? I have been able to achieve this using javascript, but wondered if there was a better way of achieving this? At the moment I am unable to change the descriptions of the current options: Account, Contact or Lead.

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  • Why can I not access this class member in python?

    - by Peter Smit
    I have the following code class Transcription(object): WORD = 0 PHONE = 1 STATE = 2 def __init__(self): self.transcriptions = [] def align_transcription(self,model,target=Transcription.PHONE): pass The important part here is that I would like to have a class member as default value for a variable. This however gives the following error: NameError: name 'Transcription' is not defined Why is this not possible and what is the right (pythonic) way to do something like this.

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  • package private static member class vs. package private class

    - by Helper Method
    I was writing two implementations of a linked list for an assignment, a doubly linked list and a circular doubly linked list. Now as the class representing a Link within the linked list is the same in both implementations, I want to use it in both. Now I wonder which approach would be better: Implement the Link class as a package private static member class in the first implementation and then use this class in the second implementation or make the Link class a package private class.

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  • Why are member constants available even if there are no instances of a its class?

    - by flockofcode
    1) Why are member constants available even if there are no instances of a its class? 2) Is the only reason why constant expressions need to be fully evaluated at compile time due to compiler replacing constant variable with literal value? 3) Since string is also an object, I would think the following would produce an error, but it doesn’t. Why? class A { const string b = “it works”; } thank you

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  • Is there a straightforward way to have a ThreadStatic instance member?

    - by Dan Tao
    With the ThreadStatic attribute I can have a static member of a class with one instance of the object per thread. This is really handy for achieving thread safety using types of objects that don't guarantee thread-safe instance methods (e.g., System.Random). It only works for static members, though. Is there some corresponding attribute that provides the same functionality, but for instance members? In other words, that allows me to have one instance of the object, per thread, per instance of the containing class?

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