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• why optimization does not happen?

  - by aaa

  hi. I have C/C++ code, that looks like this: static int function(double *I) { int n = 0; // more instructions, loops, for (int i; ...; ++i) n += fabs(I[i] > tolerance); return n; } function(I); // return value is not used. compiler inlines function, however it does not optimize out n manipulations. I would expect compiler is able to recognize that value is never used as rhs only. Is there some side effect, which prevents optimization? Thanks

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• How do you calculate the storage size of a SimpleDB domain?

  - by C. Dragon 76

  The official documentation states: Raw byte size (GB) of all item IDs + 45 bytes per item + Raw byte size (GB) of all attribute names + 45 bytes per attribute name + Raw byte size (GB) of all attribute-value pairs + 45 bytes per attribute-value pair What is the raw size of an attribute-value pair? Is it precisely the size of the value? (I would expect so, but then why is it worded "attribute-value pair"?) Or is it the size of the attribute name plus the size of the attribute value? (In that case, there would be motivation to give your attributes really short names.) For example, what is the size of the tiny domain below? +---------------------------------------------------------+ | Item Name/ID | "Price" attribute | "Calories" attribute | |--------------+-------------------+----------------------| | "apple" | "0000.43" | "0046" | | "orange" | "0000.70" | "0053" | +---------------------------------------------------------+

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• In PHP + MySQL, How do I join many tables with conditions

  - by Moe

  Hi, I'm trying to get the users full activity throughout the website. I need to Join many tables throughout the database, with that condition that it is one user. What I currently have written is: SELECT * FROM comments AS c JOIN rphotos AS r ON c.userID = r.userID AND c.userID = '$defineUserID'; But What it is returning is everything about the user, but it repeats rows. For instance, for one user he has 6 photos and 5 comments So I expect the join to return 11 rows. Instead it returns 30 results like so: PhotoID = 1; CommentID = 1; PhotoID = 1; CommentID = 2; PhotoID = 1; CommentID = 3; and so on... What am i doing wrong?

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• Reporting system for organization. Architecture advise required

  - by Andrew Florko

  We have several legacy & 3'd-party systems in organization that use several RDBMS vendors (& more specific data storages). Cross-system data reporting (as well as extra-reports that are not implemented in 3'd-party systems) is required with charts and population of templates (winword, excel). Reporting system is visioned as intranet web-site with custom user access to reports. We expect ~50 reports per day. Would you suggest to use BizTalk or any other integration software if commercial-department doesn't plan to buy anything expensive. Would you suggest to create centralized data storage for reporting that is populated regularly or rely on on-demand services that providers always up-to-request data. Thank you in advance!

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• Backbone: rendering syntax

  - by ksol

  We're using Backbone.js in one of my team's projects, and this is the first time I use it. I've seen many times this kind of code (it's coffeescript, but clear enough I think. @ means this.) clients_view = new Homespa.Views.Orders.Clients.SectionView(collection: @options.clients) @$("#clients-section").html(clients_view.render().el) clients_search_view = new Homespa.Views.Orders.Clients.SearchView @$("#clients_search_modal").html(clients_search_view.render().el) Isn't there a better way to do this? I would expect to just call render on my view, and then everything's good, I shouldn't have to get the html and append/replace it by hand. Thanks for you time !

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• Porting library from Java to Python

  - by Mike Griffith

  I'm about to port a smallish library from Java to Python and wanted some advice (smallish ~ a few thousand lines of code). I've studied the Java code a little, and noticed some design patterns that are common in both languages. However, there were definitely some Java-only idioms (singletons, etc) present that are generally not-well-received in Python-world. I know at least one tool (j2py) exists that will turn a .java file into a .py file by walking the AST. Some initial experimentation yielded less than favorable results. Should I even be considering using an automated tool to generate some code, or are the languages different enough that any tool would create enough re-work to have justified writing from scratch? If tools aren't the devil, are there any besides j2py that can at least handle same-project import management? I don't expect any tool to match 3rd party libraries from one language to a substitute in another.

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• Where's the definitive resource online about how to carry out Agile development?

  - by jdk

  I want to start Agile practices in a team. I'm assuming the information is available for free online about how to specifically carry it out. Online I can locate the manifesto, the alliances and corporations involved but where is the actual central guide or root instruction set about how to do it? (Maybe the practices themselves are more ethereal or subjective than I expect and it's found in multiple places?) Edit to summarize solutions: Agile is a concept so that's what's to be found online about it. However specific processes or methods of Agile development have been created like Scrum and Extreme programming to provide concrete solutions to teams who want to adopt Agile and reap its proposed benefits. Find the shoe (or method) that fits best. Maybe create it. If looking for solutions online to implement Agile development in your organization or for your project, seek out the specific methods too and decide among them.

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• Is the scope of what Xcode's "Build and Analyze" will catch as a leak supposed to be this limited?

  - by Ranking Stackingblocks

  It doesn't care about this: NSString* leaker() { return [[NSString alloc] init]; } I thought it would have been smart enough to check if any code paths could call that function without releasing its return value (I wouldn't normally code this way, I'm just testing the analyzer). It reports this as a leak: NSString* leaker() { NSString* s = [[NSString alloc] init]; [s retain]; return s; } but NOT this: NSString* leaker() { NSString* s = [[NSString alloc] init]; // [s retain]; return s; } which seems particularly weak to me. Does it only analyze within the local scope? If the tool can't pick up on things like this, how can I expect it to pick up on actual mistakes that I might make?

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• Tools for viewing logs of unlimited size

  - by jkff

  It's no secret that application logs can go well beyond the limits of naive log viewers, and the desired viewer functionality (say, filtering the log based on a condition, or highlighting particular message types, or splitting it into sublogs based on a field value, or merging several logs based on a time axis, or bookmarking etc.) is beyond the abilities of large-file text viewers. I wonder: Whether decent specialized applications exist (I haven't found any) What functionality might one expect from such an application? (I'm asking because my student is writing such an application, and the functionality above has already been implemented to a certain extent of usability)

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• A tool to determine jar dependencies based on existing code?

  - by geoffeg

  Is there a tool that can determine .jar dependencies given a directory of .jar files and a separate directory of java source code? I need to generate Eclipse .classpath files based on an existing code base that doesn't have any dependencies defined. To be more specific, I've been given a large codebase consisting of a dozen or so J2EE-style projects and a single directory of jar files. My client uses a custom development and build framework that is just too arcane for me to use and get any real work done. The projects do not have any information about their dependencies, either between projects or to jar libraries. I would expect this tool would have to spin through each jar file, indexing the classes available in that file and then go through each file in the project source code tree and match up the dependencies, possibly writing out a .classpath file with the required jar files. I realize this is a rather simplistic view of the operation, as duplicate classes among the jar files and such might make things more difficult.

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• How easy would it be to refactor a small JSP/Servlet/JDBC project to SpringMVC/Hibernate

  - by John

  With reference to this post, I am considering starting a new web-based Java project. Since I don't know Spring/Hibernate I was concerned if it's a bad plan to start learning them while creating a new project, especially since it will slow down the early development. One idea I had was to write a prototype using tech I do know, namely JSP/Servlets/JDBC, since I can get this running much quicker with my current knowledge. I could then throw the whole thing away and start over with Spring, etc, but I'd like to consider how easy it would be to refactor a smallish project from JSP/Servlets/JDB to SpringMVC/Hibernate? My DB could of course be re-used but what about other code... would I expect to save most of it plugged into an MVC framework, or is the paradigm shift big enough this would cause more trouble than it avoids? Please use the other question for more general advice on choosing technologies

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• Singletons vs. Application Context in Android?

  - by mschonaker

  Recalling this post enumerating several problems of using singletons and having seen several examples of Android applications using singleton pattern, I wonder if it's a good idea to use Singletons instead of single instances shared through global application state (subclassing android.os.Application and obtaining it through context.getApplication()). What advantages/drawbacks would have both mechanisms? To be honest, I expect the same answer in this post http://stackoverflow.com/questions/2709071/singleton-pattern-with-web-application-not-a-good-idea but applied to Android. Am I correct? What's different in DalvikVM otherwise? EDIT: I would like to have opinions on several aspects involved: Synchronization Reusability Testing Thanks in advance.

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• Unit Test this - Simple method but don't know what's to test!

  - by user309705

  a very simple method, but don't know what's to test! I'd like to test this method in Business Logic Layer, and the _dataAccess apparently is from data layer. public DataSet GetLinksByAnalysisId(int analysisId) { DataSet result = new DataSet(); result = _dataAccess.SelectAnalysisLinksOverviewByAnalysisId(analysisId); return result; } All Im testing really is to test _dataAccess.SelectAnalysisLinksOverviewByAnalysisId() is get called! here's my test code (using Rhino mock) [TestMethod] public void Test() { var _dataAccess = MockRepository.GenerateMock<IDataAccess>(); _dataAccess.Expect(x => x.SelectAnalysisLinksOverviewByAnalysisId(_settings.UserName, 0, out dateExecuted)); var analysisBusinessLogic = new AnalysisLinksBusinessLogic(_dataAccess); analysisBusinessLogic.GetLinksByAnalysisId(_settings, 0); _dataAccess.VerifyAllExpectations(); } Let me know if you writing the test for this method what would you test against? Many Thanks!

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• How to avoid web server traffic peak resulting from iOS Newsstand app receiving a remote notification?

  - by thomers

  I'm developing an iOS Newsstand app. If it is suspended or not running and connected to a WLAN, Newsstand apps can be triggered by a Push remote notification to download the latest issue (in our case around 100MB) in the background. I'm using Urban Airship for the delivery of the Push broadcast. I'm now worrying about many many iOS devices hitting the web server for one big download more or less at the same time, because I expect the majority of the devices will receive the notification in a very short timeframe. Instead of broadcasts to all devices, should I rather send individual notifications to batches of small groups of devices, spreading them out over a longer period of time? And/or would a CDN like Amazon Cloudfront solve that issue easier/anyway?

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• Remembering state: content offset and table cell reuse.

  - by Attacus

  I have a tableview with cells that have a scrollview in them. The scrollview is paged, 2 pages to be exact, and is meant to be able to quickly compare two small blocks of text. I'm trying to find a way to remember what the content offset of the scrollview is. Cell reuse is killing me. I've tried resetting the offset in prepareForReuse or directly in the cellForRowAtIndexPath, but it seems to give me exactly what you'd expect: Randomly offset tablecells after reuse. Anyone have any ideas?

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• why doesn't perl sort the hash key in numeric order ?

  - by Haiyuan Zhang

  #!/usr/bin/perl use strict; use warnings; my %hash; foreach ( 1 .. 10 ) { $hash{$_} = $_; } foreach ( sort(keys %hash) ) { print $_ . ": " . "$hash{$_}" . "\n" ; } execute the above code, the result is as below : 1: 1 10: 10 2: 2 3: 3 4: 4 5: 5 6: 6 7: 7 8: 8 9: 9 Yes, I expect "10: 10" to be the last one taht is printed . So I just need someone to explain why perl give me surprise in this case.

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• str_replace problem

  - by user330840

  I am trying to change title data into URL. I need to get rid off all text starting from "deadline" from the following dynamic data which I get from $title: New York deadline May 14th, 2010 (urgent) New Hampshire deadline May 19th, 2010 New Jersey deadline I expect the result should be like this new-york new-hampshire new-jersey Here is the code I have tried $newurl = strip_tags(str_replace("deadline","","$title")); $code_entities_match = array( '&quot;' ,'!' ,'@' ,'#' ,'$' ,'%' ,'^' ,'&' ,'*' ,'(' ,')' ,'+' ,'{' ,'}' ,'|' ,':' ,'"' ,'<' ,'>' ,'?' ,'[' ,']' ,'' ,';' ,"'" ,',' ,'.' ,'_' ,'/' ,'*' ,'+' ,'~' ,'`' ,'=' ,' ' ,'---' ,'--','--'); $code_entities_replace = array('' ,'-' ,'-' ,'' ,'' ,'' ,'-' ,'-' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'-' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'' ,'-' ,'' ,'-' ,'-' ,'' ,'' ,'' ,'' ,'' ,'-' ,'-' ,'-','-'); $newtitle = str_replace($code_entities_match, $code_entities_replace, $newurl); $urltitle = strtolower($newtitle); Unfortunately, the results are: new-york-deadline-may-14th-2010-urgent new-hampshire-deadline-may-19th-2010 new-jersey- Anyone can help?

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• List in a Python class shares the same object over 2 different instances?

  - by zfranciscus

  I created a class: class A: aList = [] now I have function that instantiate this class and add items into the aList. note: there are 2 items for item in items: a = A(); a.aList.append(item); I find that the first A and the second A object has the same number of items in their aList. I would expect that the first A object will have the first item in its list and the second A object will have the second item in its aList. Can anyone explain how this happens ? PS: I manage to solve this problem by moving the aList inside a constructor : def __init__(self): self.aList = []; but I am still curious about this behavior

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• User.Identity.Name returning NT AUTHORITY\NETWORK SERVICE i want Domain\USER

  - by Jalvemo

  in my asp.net MVC project i have an database connection with connectionstring: Data Source=.;Initial Catalog=dbname;Integrated Security=True All users can execute Stored Procedures on that connection and i want to log those users. so after each execution I store "User.Identity.Name" to another database. This work great on my development machine but after deployment, to access the site i have to go through a VPN-connention and then remote desktop to the same server that the IIS is running on and use a web-browser there. Then i get User.Identity.Name: "NT AUTHORITY\NETWORK SERVICE". i would expect it to be the credentials i entered in remote desktop that have access to the database. any idea how i can get this to work? iis6 authentication: "windows authentication: enabled" web.config:

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• How to handle "100 continue" HTTP message ?

  - by Stephane

  Hello, I'm writing a simplistic HTTP server that will accept PUT requests mostly from cURL as client and I'm having a bit of an issue with handling the "Expect: 100-continue" header. As I understand it, the server is supposed to read the header, send back a "HTTP/1.1 100 Continue" response on the connection, read the stream up to the value on "Content-Length" and then send back the real response code (Usually "HTTP/1.1 200 OK" but any other valid HTTP answer should do). Well, that's exactly what my server does. The problem is that, apparently, if I send a "100 Continue" answer, cURL fails to report any subsequent HTTP error code and assumes the upload was a success. For instance, if the upload is rejected due to the nature of the content (there is a basic data check happening), I want the calling client to detect the problem and act accordingly. Am I missing something obvious ? Thanks

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• Credit Card checksums and validations that do not require connection to the financial institution

  - by cjavapro

  The validations I know of are: Checksum the whole card number should add up to zero. (range is 0-9) Check the first digit(s) against the card type Check the length against the card type Check the CCV length against the card type (I think all the major types are 3 anyway) Of course make sure it is accepted card type as well as non expired. Are there any other validations :) (I expect many folks did not know about all of these) The reason I ask is because I overheard there was one to checksum number against expiration or CCV.. I just wanted to check.

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• How Do I Update a Table From Another Table Only If the Result Count is 1?

  - by Russ Bradberry

  I have a table of 2 tables in a one to many relationship. I want to run an update script that will update the table with the FK of the related table only if there is one result (because if there is multiple then we need to decide which one to use, in another method) Here is what I have so far: UPDATE import_hourly_event_reports i SET i.banner_id = b.banner_id FROM banner b JOIN plan p ON b.plan_id = p.id WHERE b.campain_id = i.campaign_id AND b.size_id = i.size_id AND p.site_id = i.site_id HAVING COUNT(b.banner_id) = 1 As you can see, the HAVING clause doesn't quite work as I'd expect it. I only want to update the row in the import table with the id of the banner from the banner table if the count is equal to 1.

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• Hide header if node body is empty - Drupal php snippet help

  - by Toxid

  Hello! I've made a content type for links, I'm trying to make a link directory. People only have to submit the link, description is voluntary. If no description is entered, I want the header that says "description" to disappear. The description field is the node body. Right now my snippet looks like this <?php if (!empty($node->body)) {?> <div class="field field-type-link field-field-link-archive"> <h3>Description</h3> <?php print $node->content['body']['#value'] ?></div> <?php }?> I expect this to check if node body is not empty, and if it isn't it'll print what's there. The problem is that the Description header is still printed out even if the node body is empty. Can anyone see what's wrong?

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• Why this code does not do what I mean?

  - by Mike

  $w = 'self-powering'; %h = (self => 'self', power => 'pau?', ); if ($w =~ /(\w+)-(\w+)ing$/ && $1~~%h && $2~~%h && $h{$2}=~/?$/) { $p = $h{$1}.$h{$2}.'ri?'; print "$w:"," [","$p","] "; } I expect the output to be self-powering: selfpau?ri? But what I get is: self-powering: [ri?] My guess is something's wrong with the code $h{$2}=~/?$/ It seems that when I use $h{$2}!~/?$/ Perl will do what I mean but why I can't get "self-powering: selfpau?ri?"? What am I doing wrong? Any ideas? Thanks as always for any comments/suggestions/pointers :)

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• Clickonce application does not update or launch.

  - by jhunter

  I have a winforms application that I have deployed using clickonce, but the users navigate to a network drive and double click on setup.msi instead of using a webpage to install it. I have two users that have it installed and it's worked in the past. I did an udpate last week and now when the users try to launch the application the window that says "Verifying Application Requirements" pops up then when it disappears nothing happens. The dialog asking if it's ok to update never pops up. The network people have verified that they have permissions on the network drive (though, I would expect an error message if this were the issue). Any clues what could cause this to happen?

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