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• Copy constructor with more than one parameter

  - by Ravi Gupta

  I am learning C++ and was reading copy constructor from the C++: The Complete Reference. The books says that It is permissible for a copy constructor to have additional parameters as long as they have default arguments defined for them. However, in all cases the first parameter must be a reference to the object doing the initializing. But I am confused that how we are going to pass those additional parameters? I am sure there should be some way which is not given in the book and which I am unable to figure out. Can anyone help me out? EDIT: Also is it possible to pass these extra parameters in all three cases i.e. ¦ When one object explicitly initializes another, such as in a declaration ¦ When a copy of an object is made to be passed to a function ¦ When a temporary object is generated (most commonly, as a return value)

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• Using DataTypeAttribute to validate a date

  - by Andy Evans

  I'm having some difficulty understanding how to validate a date (DOB) using MVC2. What I want to do is 1. Is the date entered a valid date and, 2. Is the date at lease 13 years in the past. For example, to validate an email I use the following code: [Required(ErrorMessage = "Email address is required.")] [StringLength(320, ErrorMessage = "Email must be less than 320 characters.")] [Email(ErrorMessage = "This email address is invalid.")] public string email { get; set; } To validate the email I use: public class EmailAttribute : RegularExpressionAttribute { public EmailAttribute() : base("insert long regex expression here") { } } Any assistance would be greatly appreciated, thanks!

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• How do I get python to load .NET .dlls referenced by mixed mode .dlls?

  - by Michael Kelley

  I have a python .pyd that is a mixed mode C++ DLL. The DLL loads fine and loads unmanaged C++ dlls without a problem, but when it tries to load the .NET dlls referenced by the managed C++ dlls it fails with this error message: Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly '...' Copying these .NET dlls to the directory that pythod_d.exe is contained in allows the .NET libraries to load successfully, but this is not a good long term solution. Is there an environment variable I have to set or some command line option to python_d.exe that will solve my problem? Note that using IronPython or Python .NET is NOT acceptable.

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• zend_acl: Adding extra resources dynamically and getting a param predispatch

  - by Timmeh

  First sorry about the woffle as I'm not sure how best to describe this. Basically I am not sure how I can get param in the bootstrap before the controller is loaded, but here is the long winded version... I have got an acl class storing all my default resources in. All my page/post content is a database and I want the admin the ability to choose who which role the page would become available. I know it is possible just to loop through the database table and add them all in at once, but I am concerned that this is a drain on resources. I have it working whereby my access check plugin can call a dynamic permission function, but I need to get the parameter of the current page ID and it's permission to set it before the controller is loaded. Does that make sense or am I worry over nothing and I should just get the resources of all the pages at once? thanks in advance for reading my garble!!

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• Hashing a python method to regenerate output when method is modified

  - by Seth Johnson

  I have a python method that has a deterministic result. It takes a long time to run and generates a large output: def time_consuming_method(): # lots_of_computing_time to come up with the_result return the_result I modify time_consuming_method from time to time, but I would like to avoid having it run again while it's unchanged. [Time_consuming_method only depends on functions that are immutable for the purposes considered here; i.e. it might have functions from Python libraries but not from other pieces of my code that I'd change.] The solution that suggests itself to me is to cache the output and also cache some "hash" of the function. If the hash changes, the function will have been modified, and we have to re-generate the output. Is this possible or a ridiculous idea? If this isn't a terrible idea, is the best implementation to write f = """ def ridiculous_method(): a = # # lots_of_computing_time return a """ , use the hashlib module to compute a hash for f, and use compile or eval to run it as code?

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• Setting up a Git remote with a truncated history

  - by drg

  I am in the midst of doing some non-standard, probably doomed, experiments on a git repository. The goal is to create a remote repository with a truncated history which can still share commits with an internal repository which has a full history. I've had some success using a graft to connect the public history with the private history - when I push from my internal repository, only the post-graft contents are included. So my main question is: what is the simplest way of taking a commit, eliminating its parent and writing a graft in place of the parent? A more general question: is what I'm trying to do going to cause me pain in the long run, do you know if there's a better way?

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• Does any faster centralized version control than SVN exists?

  - by Savageman

  Hello, I've been using SVN since a long time and now we're trying on Git. I'm not talking on the centralized / decentralized debate here. My only concern is speed. The latter tool is much faster. But sometimes, I NEED to work with a centralized approach, which is much more simple and less complex than the decentralized one. The learning curve is really fast, which saves a lot of time (while digging into decentralized would lead to a waste of time, given the learning curve is much longer and we encounter more problem when working with it). However, SVN is really slow compared to GIT, and I don't think it has anything to do with the centralized argument. Decentralized systems also have to deal with server connections and file transfert. So I can easilly imagine a faster implementation of centralized version control could exists. Does someone has any clue on this?

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• What's a better choice for SQL-backed number crunching - Ruby 1.9, Python 2, Python 3, or PHP 5.3?

  - by Ivan

  Crterias of 'better': fast im math and simple (little of fields, many records) db transactions, convenient to develop/read/extend, flexible, connectible. The task is to use a common web development scripting language to process and calculate long time series and multidimensional surfaces (mostly selectint/inserting sets of floats and dong maths with rhem). The choice is Ruby 1.9, Python 2, Python 3, PHP 5.3, Perl 5.12, JavaScript (node.js). All the data is to be stored in a relational database (due to its heavily multidimensional nature), all the communication with outer world is to be done by means of web services.

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• javascript memory leak

  - by hhj

  I have a some javascript (used with google maps api) that I am testing on IE and Chrome and noticed memory leak symptoms in IE only: when I refresh the page continuously, the amount of memory used in IE keeps growing (fast), but in Chrome it stays constant. Without posting all of the code (as it is rather long), can I get some suggestions as to what to look out for? What could cause the memory to keep growing like this in IE on page refreshes? Like I said I know its hard without code, but I'd like to see if any generic advice works first. Thanks.

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• Gnome Desktop Icons Alignment

  - by Gabriel L. Oliveira

  Hi all. It has been a long time since I started to compare the gnome desktop to the windows desktop. But since I began to use linux, I realized that the "gnome way" to align the icons on Desktop is not that nice for me. And comparing to Windows's way, windows is better for me. (remember, for me). I'd like to know if anyone has some tip to make "gnome desktop icon alignment" more like windows do. I tried to reduce the icon's size, did something, but was not that all. So, could anyone tell another tip? I like when I put something on windows desktop, and wherever I put the file, Windows organize the file and put the icon right after the last icon (in a cascade style) (and automatically). Any tips?

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• Where will this AsyncTask run?

  - by Binoy Babu

  Say I have this code in the AlertDialog.Builder(context) of my application. The question is in which Thread will it run? final Thread myPrettyOperation = new Thread() { @Override public void run() { //Do some really long operation. } }; class MyPrettyTask extends AsyncTask<Void, Integer, Boolean> { protected Boolean doInBackground( Void... voids) { myPrettyOperation.start(); return true; } protected void onProgressUpdate( Integer... progress) { } protected void onPostExecute(Boolean result) { } } new MyPrettyTask().execute();

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• VSTO addin (2003-2007) Ms Word & Webservices

  - by Daveo

  Hi, I am planning on starting my 1st VSTO project. What I want to be able to do is: Download and Upload versions of a MS Word document to a web service. With authentication by overriding the save button Call a web service to list a bunch of tag that can be inserted into a document. When a user double clicks a tag the selected tag is inserted into the cursor position. I am pretty sure this is all possible just want some confirmation? Also would like to know how long would it take to make something like this. I think the biggest issue will be authentication and listing exiting files to download then allowing the user to download a .doc and restore previous versions of that file via the web service.

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• Read binary data from a MDB-file running under LAMP

  - by BusterX

  I need to be able to connect to an MDB-file in a LAMP-environment (running on Linux) and ultimately insert converted data into a Mysql db. The data I need to access is stored as a BLOB (Long Binary Data according to Access) in the MDB file. I have not yet been able to actually have a look at the data but I have been told that the BLOB consists of byte strings. Something along the lines of: 0x1c 0x10 0x27 0x00 0x00 I need to parse the byte strings and convert these to a format that is human readable. I do have access to the documentation that explains the various byte strings. So this is really two questions: How do a get access to the MDB file via PHP* (running under LAMP) and read the BLOB (I do not have access to a Windows-platform)? What would be the best way to parse the binary data (in PHP*) once I am able to connect to the MDB-file? *Or are there other methods/languages that are more appropriate?

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• Compilation Error on Recursive Variadic Template Function

  - by Maxpm

  I've prepared a simple variadic template test in Code::Blocks, but I'm getting an error: No matching function for call to 'OutputSizes()' Here's my source code: #include <iostream> #include <typeinfo> using namespace std; template <typename FirstDatatype, typename... DatatypeList> void OutputSizes() { std::cout << typeid(FirstDatatype).name() << ": " << sizeof(FirstDatatype) << std::endl; OutputSizes<DatatypeList...>(); } int main() { OutputSizes<char, int, long int>(); return 0; } I'm using GNU GCC with -std=C++0x. Using std=gnu++0x makes no difference.

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• How to run only the latest/a given test using Rspec?

  - by marcgg

  Let's say I have a big spec file with 20 tests because I'm testing a large model and I had no other way of doing it : describe Blah it "should do X" do ... end it "should do Y" do ... end ... it "should do Z" do ... end end Running a single file is faster than running the whole test suite, but it's still pretty long. Is there a way to run the last one (ie the one at the end of the file, here "should do Z")? If this is not possible, is there a way to specify which test I want to run in my file ?

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• Is reverse engineering evil?

  - by Amir Arad

  Lately I've been pondering on how a specific beloved old game actually works. I had some mild progress, but then a friend pointed out that if I really loved the game and appreciate it, I wouldn't try to reverse-engineer it. Note that the game is long considered an abandonware and is offerd for download publicly in lawful game sites, and I have no commercial / other large scale intentions - just to learn and "mess around" with it. Did I miss something? Is there an ethical taboo regarding reverse-engeneering? Alternatively, is there a legal issue?

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• Select in PL-SQL Errors: INTO After Select

  - by levi

  I've the following query in a test script window declare -- Local variables here p_StartDate date := to_date('10/15/2012'); p_EndDate date := to_date('10/16/2012'); p_ClientID integer := 000192; begin -- Test statements here select d.r "R", e.amount "Amount", e.inv_da "InvoiceData", e.product "ProductId", d.system_time "Date", d.action_code "Status", e.term_rrn "IRRN", d.commiount "Commission", 0 "CardStatus" from docs d inner join ext_inv e on d.id = e.or_document inner join term t on t.id = d.term_id where d.system_time >= p_StartDate and d.system_time <= p_EndDate and e.need_r = 1 and t.term_gr_id = p_ClientID; end Here is the error: ORA-06550: line 9, column 3: PLS-00428: an INTO clause is expected in this SELECT statement I've been using T-SQL for a long time and I'm new to pl-sql What's wrong here?

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• How to convert a MSSQL database (including procedures, functions and triggers) to a firebird databas

  - by user193655

  I am considering migrating to Firebird. To have a "quick start" approach I downloaded the trial of a conversion tool (DBConvert) and tried it. I just picked up a random tool, this tool doesn't convert procedures, functions and triggers (I don't think it is a limit of the trial since there is not an explicit reference to sp, sf and triggers in the link above). Anyway by trying that tool I had the message: "The DB cannot be converted succesfully because some FK names are too long." This is because in some tables I have FK whose description is 32 chars. Is this a real firebird limit or it is possible to overcome it somehow (of course renaming the FK is an extreme option because it is extra work)? Anyway how to convert a MS SQL DB fully to FIREBIRD? Is there a valid tool? Did someone succed in a conversion of non trivial databases?

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• Learning to think in the Object Oriented Way

  - by SpikETidE

  Hi Everyone.... I am a programmer trying to learn to code in the object oriented paradigm... I mainly work with PHP and i thought of learning the zend framework... So, felt I need to learn to code in OO PHP.... The problem is, having done code using functions for quite a long time, i just can't get my head to think in the OO way.... Also felt that probably I am not the only one facing this problem since the beginning of time... So, how did you people learn object oriented programming... especially how did you succeed in "unlearning" to code using functions... and learn to see you code as objects...? Is there any good resource books or sites where one could find help...?? Thanks for sharing your knowledge and experiences...

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• iPhone or Android for development?

  - by user974873

  I have programming experience and would like to start developing for mobile platforms. Now I see that iPhone and Android are both dominating he smartphone market, but also that more and more people are buying iPhones. Which one would be better to start developing for? I currently do not own a Mac but would purchase a Mac Mini if I was to buy an iPhone. Would it be better to buy iPhone and Mac because it will be better in the long run because of the amount of users or Android?

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• How to handle all exceptions in a web java project

  - by Nick Donovan

  I am doing an web java project about an hotel reservation. I am using, sql, hibernate, java server pages. I want to know how can I redirect an incoming exception to an error.jsp file . There are a lot of java code , and a lot of jsp file. So I want to rederict every exception that I haven't handle to an error page, is there any way to do it ? An exception can come from everywhere and I can't know and handle them all ( for example an user can write to much data in an textfield, and it will generate me an sql exception for data to long) Thank you, sorry for my english.

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• Fade animation UITableViewCell

  - by Tomas

  Hi everyone, I have a UITableViewController that populates a UITableView with some data that I pull off the net. The data for each cell consists also of an image used as background, which I'm downloading in a separated NSOperation added to a NSOperationQueue with a MaxConcurrentOperationCount set to 4. As long as the image is not downloaded I'm showing a generic placeholder which I would like to replace (fading out/fading in) with the downloaded image once it's being successfully downloaded. I'm using the following code placed inside the cellForRowAtIndexPath of the UITableViewController. [UIView beginAnimations:@"fade" context:nil]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:3.0]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; cell.placeholderUIImage.alpha = 0.0; cell.backgroundUIImage.alpha = 1.0; [UIView commitAnimations]; This is unfortunately just working randomly for a couple of rows, since for the most the background image is set instantly, as if the animation started on one cell would have been "overwritten" by the next call of beginAnimations.

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• Tab versus space indentation in C#

  - by Lars Fastrup

  I sometimes find myself discussing this issue with other C# developers and especially if we use different styles. I can see the advantage of tab indentation allowing different developers to browse the code with their favorite indent size. Nonetheless, I long ago went for two space indentation in my C# code and have stuck with it ever since. Mainly because I often disliked the way statements spanning multiple lines are sometimes messed up when viewing code from other developers using another tab size. Recently a developer at one of my clients approached me and asked why I did not use tabs because he preferred to view code with an indentation size of 4. So my question is: Which style do you prefer and why?

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• Will this LINQ-TO-SQL query fetch all records from the table ?

  - by Puneet Dudeja

  public long GetNewCRN() { return ((from c in DataContext.GetTable<Cust_Master>() select c.CUSTSERH_CRN).Max() + 1); } Will this Linq to Sql query fetch all records from the table first and then select the maximum of the column ? If yes, then isn't it a bad idea using linq to sql instead of normal SqlCommand ? Or is there any other way of doing it in linq to sql ? When I attach Console.Out, I see nothing(command prompt does not even open). But when I include following:- context.Log = new System.IO.StreamWriter("d:\\abcd.txt"); I get an error, that "The process can not access the file because it is being used by another process" and that process is "w3wp.exe". How can I see the sql commands being executed by DataContext then ?

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• Any open source hosting site for abandoned projects?

  - by ssg

  I have some projects which I have ceased their development a long time ago but still get code access requests for. I'm currently providing zipped packages from my personal web site. I think zipped packages are far from being useful (e.g. can't read code right away, can't provide url's to individual source files, can't fork easily, lifetime is dependent on my own web page's). I want that archaic code to be present on the net regardless I keep my web page up or not. I saw the question "What's the best open source hosting site?". However, most sites request the project "to be active", Codeplex for instance. I didn't go through EULA's of all providers to see if they allow abandoned projects. Are there elephant's graveyards for old code without activity restrictions? Which one would you pick, why?

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