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• Advantage of using a static member function instead of an equivalent non-static member function?

  - by jonathanasdf

  I was wondering whether there's any advantages to using a static member function when there is a non-static equivalent. Will it result in faster execution (because of not having to care about all of the member variables), or maybe less use of memory (because of not being included in all instances)? Basically, the function I'm looking at is an utility function to rotate an integer array representing pixel colours an arbitrary number of degrees around an arbitrary centre point. It is placed in my abstract Bullet base class, since only the bullets will be using it and I didn't want the overhead of calling it in some utility class. It's a bit too long and used in every single derived bullet class, making it probably not a good idea to inline. How would you suggest I define this function? As a static member function of Bullet, of a non-static member function of Bullet, or maybe not as a member of Bullet but defined outside of the class in Bullet.h? What are the advantages and disadvantages of each?

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• WCF DataContract with readonly properties

  - by Asaf R

  I'm trying to return a complex type from a service method in WCF. I'm using C# and .NET 4. This complex type is meant to be invariant (the same way .net strings are). Furthermore, the service only returns it and never recieves it as an argument. If I try to define only getters on properties I get a run time error. I guess this is because no setters causes serialization to fail. Still, I think this type should be invariant. Example: [DataContract] class A { [DataMember] int ReadOnlyProperty {get; private set;} } The service fails to load due to a problem with serialization. Is there a way to make readonly properties on a WCF DataContract? Perhaps by replacing the serializer? If so, how? If not, what would you suggest for this problem? Thanks, Asaf

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• Add api key to every request in ActiveResource

  - by Jared

  I have 2 RESTful Rails apps I'm trying to make talk to each other. Both are written in Rails 3 (beta3 at the moment). The requests to the service will require the use an api key which is just a param that needs to be on every request. I can't seem to find any information on how to do this. You define the url the resource connects to via the site= method. There should be an equivalent query_params= method or similar. There is one good blog post I found related to this and it's from October 2008, so not exactly useful for Rails 3.

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• GDB question - how do I go through disassembled code line by line?

  - by user324994

  I'd like to go through a binary file my teacher gave me line by line to check addresses on the stack and the contents of different registers, but I'm not extremely familiar with using gdb. Although I have the C code, we're supposed to work entirely from a binary file. Here are the commands I've used so far: (gdb) file SomeCode Which gives me this message: Reading symbols from ../overflow/SomeCode ...(no debugging symbols found)...done. Then I use : (gdb) disas main which gives me all of the assembly. I wanted to set up a break point and use the "next" command, but none of the commands I tried work. Does anyone know the syntax I would use?

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• "Nearly divisible"

  - by bobobobo

  I want to check if a floating point value is "nearly" a multiple of 32. E.g. 64.1 is "nearly" divisible by 32, and so is 63.9. Right now I'm doing this: #define NEARLY_DIVISIBLE 0.1f float offset = fmodf( val, 32.0f ) ; if( offset < NEARLY_DIVISIBLE ) { // its near from above } // if it was 63.9, then the remainder would be large, so add some then and check again else if( fmodf( val + 2*NEARLY_DIVISIBLE, 32.0f ) < NEARLY_DIVISIBLE ) { // its near from below } Got a better way to do this?

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• Hibernate Validator - Using properties in the constraints xml

  - by Avi Y

  Hi, I have just started using hibernate validator. I am creating the constraints in an XML file(not annotations). The only problem I am having is that I would like to use properties inside the constraints. For example: <bean class="MyBean" > <constraint annotation="javax.validation.constraints.Min"> <element name="value">{myProperty}</element> </constraint> </bean> and I would like to define these properties in a separate file. Do you think that's possible? Any help would be appreciated.

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• Problem wit MDAC when trying to compile in VS2008 using x64 bit target platform

  - by grobartn

  I am trying to compile an 32 bit application. I am aware of problems with it but that is why its being compiled on 64 bit version. I am hanging at this problem. Application uses lots of sql stuff. In sqltypes.h file: (provided by MDAC) #ifdef _WIN64 typedef INT64 SQLLEN; typedef UINT64 SQLULEN; typedef UINT64 SQLSETPOSIROW; #else For some reason when its compiled on 32 bit platform it works great But when I try building it on 64 it goes berserk. Error 61 error C2146: syntax error : missing ';' before identifier 'SQLLEN' ..\external\microsoft sdk\include\sqltypes.h 50 It does not recognize INT64, UINT64. Is there something I need to enable so it will work under 64 build process? Missing some #include or #define? Any help would be great Thanks

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• How can I refactor this to use an inline function or template instead of a macro?

  - by BillyONeal

  Hello, everyone :) I have a useful macro here: #define PATH_PREFIX_RESOLVE(path, prefix, environment) \ if (boost::algorithm::istarts_with(path, prefix)) { \ ExpandEnvironmentStringsW(environment, buffer, MAX_PATH); \ path.replace(0, (sizeof(prefix)/sizeof(wchar_t)) - 1, buffer); \ if (Exists(path)) return path; \ } It's used about 6 times within the scope of a single function (that's it), but macros seem to have "bad karma" :P Anyway, the problem here is the sizeof(prefix) part of the macro. If I just replace this with a function taking a const wchar_t[], then the sizeof() will fail to deliver expected results. Simply adding a size member doesn't really solve the problem either. Making the user supply the size of the constant literal also results in a mess of duplicated constants at the call site. Any ideas on this one?

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• Sum of path products in DAG

  - by Jules

  Suppose we have a DAG with edges labeled with numbers. Define the value of a path as the product of the labels. For each (source,sink)-pair I want to find the sum of the values of all the paths from source to sink. You can do this in polynomial time with dynamic programming, but there are still some choices that can be made in how you decompose the problem. In my case I have one DAG that has to be evaluated repeatedly with different labelings. My question is: for a given DAG, how can we pre-compute a good strategy for computing these values for different labelings repeatedly. It would be nice if there was an algorithm that finds an optimal way, for example a way that minimizes the number of multiplications. But perhaps this is too much to ask, I would be very happy with an algorithm that just gives a good decomposition.

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• How to add system property equivalent to java -D in Ant

  - by Shervin

  Hi. I need to set java -Djava.library.path=/some/path and I want to do it when I am running my ant script, building my jar. I think I have to use <sysproperty key="java.library.path" value="/some/path"/> but it doesnt work. I cannot make the syntax work. The only thing I have Googled and found is sysproperty in conjunction with <java classname> but that doesnt make any sense to me. I am not sure if this is relevant, but I am using ant to create a ear and deploying this ear in JBoss.

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• how to initialize a 2d array in perl

  - by Mark

  How do I initialize a 2d array in perl? I am trying the following code: 0 use strict; 10 my @frame_events = (((1) x 10), ((1) x 10)); 20 print "$frame_events[1][1]\n"; but it gives the following error: Can't use string ("1") as an ARRAY ref while "strict refs" in use at ./dyn_pf.pl line 20. This syntax only seems to initialize a 1d array as print "$frame_events[1]\n" works. Though perl doesn't give any error during the assignment.

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• Execute an autocommand only once

  - by Andrej M.

  I have an issue with using GVim on Windows. I have set up the following in my .vimrc: if has("gui_running") autocmd VIMEnter * :source C:/session.vim endif Unfortunately this creates a problem. If I'm a the top of the file and try to move up a line (k), the screen flashes. If I hold the key for just a second it will flash a few dozen times, it is really nasty too look at. I've tried using GUIEnter instead but I got the same results. The docs mention that I can fire an autocommand only once, but I couldn't figure out the exact syntax. Care to help?

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• How to maintain tabs when pasting in Vim

  - by Ant Wilson

  I use the tab key to indent my python code in Vim, but whenever I copy and paste a block Vim replaces every tab with 4 spaces, which raises an IndentationError I tried setting :set paste as suggested in related questions but it makes no difference Other sites suggest pasting 'tabless' code and using the visual editor to re-indent, but this is asking for trouble when it comes to large blocks Are there any settings I can apply to vim to maintain tabs on copy/paste? Thanks for any help with this :) edit: I am copying and pasting within vim using the standard gnome-terminal techniques (ctrl+shift+c / mouse etc.) my .vimrc is: syntax on set ts=4 if has("terminfo") let &t_Co=8 let &t_Sf="\e[3%p1%dm" let &t_Sb="\e[4%p1%dm" else let &t_Co=8 let &t_Sf="\e[3%dm" let &t_Sb="\e[4%dm" endif I looked up that ts - Sets tab stops to n for text input, but don't know what value would maintain a tab character

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• doctrine2: many-to-one with non default referencedColumnName does not persist entity

  - by timaschew

  I'm using symfony 2.1.2 with FOSUserBundle. I extend the User from FOS and define a many-to-one (bidirectional) association to a Customer entity. I don't want to use primary key for the association (referencedColumnName). I will use another integer uniqe column: customer_no use FOS\UserBundle\Entity\User as BaseUser; /** * @ORM\Entity * @ORM\Table(name="t_myuser") */ class MyUser extends BaseUser { /** * @ORM\ManyToOne(targetEntity="Customer", inversedBy="user") * @ORM\JoinColumn(name="customer_no", referencedColumnName="customer_no", nullable=false) */ $public $customer; } /** * @ORM\Entity * @ORM\Table(name="t_customer") */ class Customer extends BaseEntity // provides an id (pk) { /** * @ORM\Column(type="integer", unique=true, nullable=false) */ public $customer_no; /** * @ORM\OneToMany(targetEntity="MyUser", mappedBy="customer") */ public $user; } When I try to persist (via a form) a new MyUser entity with an (already in db existing and) loaded Customer entity from db, I get this error: Notice: Undefined index: customer_no in ...\vendor\doctrine\orm\lib\Doctrine\ORM\Persisters\BasicEntityPersister.php line 608 The schema on the db is all right. //update: I fix the inversedBy and mappedBy stuff, but this is not the problem.

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• texture on cube-side with opengl

  - by Tyzak

  hello i want to use a texture on a cube (created by glutsolidcube()), how can i define where the texture is pictured at? (for example on the "frontside" of a cube) glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, texture[0]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filterMode); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filterMode); glColor4f(0.8,0.7,0.11,1.0); glPushMatrix(); glScalef(4, 1.2, 1.5); glTranslatef( 0, 0.025, 0); glutSolidCube(0.1); glPopMatrix(); glDisable(GL_TEXTURE_2D); thanks

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• JavaScript: window.opener.location.href question

  - by vastbeyond

  I need to make a little JS app to scroll automatically through a list of URLs. I've chosen to have the functionality in a pop-up, for various reasons. The syntax to change the opening window's URL is: window.opener.location.href = "http://www.example.com"; This works fine with one URL, but if two statements are called, only one is executed. I experimented with an alert statement between two of the above statements, and the alert event made the second statement function properly: window.opener.location.href = "http://www.example1.com"; alert("hello world"); window.opener.location.href = "http://www.example2.com"; Question is: does anyone know how to get the first and second window.opener statements to work, without the intervening alert();? Also, how can I add a pause between the two statements, so that the second executes a couple of seconds after the first? Thanks so much!

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• Loading Youtube Iframe API with RequireJS

  - by davidgnin

  I'm trying to use the Youtube Iframe API inside a module definded with Require JS. As this API is loaded async and calls a function once is loaded, I used a requireJS plugin called "async", that worked before with google maps api. However, this time something isn't working. My module starts this way: define(['text!fmwk/widgets/video/video.html','fmwk/utils/browser','async!http://www.youtube.com/iframe_api'], function (videoTpl,root) { ... }); and chrome console fires this error: Uncaught Error: Load timeout for modules: async!http://www.youtube.com/iframe_api_unnormalized3,async!http://www.youtube.com/iframe_api http://requirejs.org/docs/errors.html#timeout If I don't use async plugin the object YT or its functions are undefinded, and the same happens if I download the API code. The API is loaded sometimes if I put an script tag in the head tag of the html file. All this is expected, but I don't understand because async plugin fails. Thank you for your attention and help :)

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• Changing Emacs Forward-Word Behaviour

  - by gvkv

  As the title says, how does one change the behaviour of emacs forward-word function? For example, suppose [] is the cursor. Then: my $abs_target_path[]= abs_path($target); <M-f> my $abs_target_path = abs[_]path($target); I know I could just use M-f M-b but as far as I'm concerned, that shouldn't be necessary and I'd like to change it. In particular, I want two things: When I press M-f, I want to go to the first character of the next word regardless of whether the point is within a word, within a group of spaces or somewhere else. Customize word-characters on a mode-by-mode basis. After all, moving around in CPerl mode is different than, say, TeX mode. So, in the above example, item 1 would have the cursor would move to the 'a' (and the point to it's left) after hitting M-f. Item 2 would allow me to define underscores and sigils as word characters.

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• In OpenRasta, how do I configure a URI where I get "the remainder of the path" as a single string?

  - by Daniel Earwicker

  Normally in OpenRasta there is some configuration like this: ResourceSpace.Has.ResourcesOfType<Customers>() .AtUri("/customers/region/{region}") ... // and so on ... where the {region} part of the path is automatically mapped to a string parameter in the handling method. So if the user hits: http://server/customers/region/emea Then the handler method is passed the string "emea". As well as doing this, I'd like to register a handler with something like this: ResourceSpace.Has.ResourcesOfType<Customers>() .AtUri("/someotherthing/*") ... // and so on In this imaginary syntax, the asterisk would mean "take the rest of the path, including slashes, to be a single string parameter to pass to the handling method". And so if the user hits: http://server/someotherthing/how/about/this?that=other Then my handler method receives a string parameter: how/about/this?that=other Is such a thing possible in OpenRasta? In Sinatra (Ruby) I'd use a regular expression to do exactly this.

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• Spring - using static final fields (constants) for bean initialization

  - by lisak

  Hey, is it possible to define a bean with the use of static final fields of CoreProtocolPNames class like this: <bean id="httpParamBean" class="org.apache.http.params.HttpProtocolParamBean"> <constructor-arg ref="httpParams"/> <property name="httpElementCharset" value="CoreProtocolPNames.HTTP_ELEMENT_CHARSET" /> <property name="version" value="CoreProtocolPNames.PROTOCOL_VERSION"> </bean> public interface CoreProtocolPNames { public static final String PROTOCOL_VERSION = "http.protocol.version"; public static final String HTTP_ELEMENT_CHARSET = "http.protocol.element-charset"; } If it is possible, what is the best way of doing this ?

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• Selecting a UserControl from XAML

  - by kmontgom

  I'm working on a problem right now where I need to embed a UserControl inside another UserControl. But, I need to determine at runtime which embedded UserControl to instantiate. This implies to me that some form of data binding and/or template selection mechanism has to be invoked, but I'm not sure how to proceed with the pure XAML approach. If I was to do this with code, I would define some sort of container control in the parent UserControl, and then in the code-behind, implement some logic which would instantiate the appropriate child UserControl and then insert it as Content into the specified container in the parent UserControl. Can this be done using only XAML, or is some sort of code-behind required?

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• Sencha Touch 2: List does not display in Panel

  - by jrboddie

  I am working on an MVC app in Sencha Touch 2 and am having trouble getting a list to display in a nested panel. The structure of the app has a main view which is a tab panel. One of the items in the tab panel is a defined panel, xtype: 'homepanel'. An item in this panel is the list, xtype: 'newslist' that is linked to the appropriate store and model files. The list does not display unless I change its parent 'homepanel' to a type, Ext.navigation.View. What am I missing in the definition of 'homepanel' as a Panel that prevents the display of the list? Ext.define('ACSO.view.Home', { extend: 'Ext.Panel', //<--works if Ext.navigation.View xtype: 'homepanel', requires: [ 'Ext.TitleBar', 'ACSO.view.NewsList' ], config: { title: 'Home', iconCls: 'home', cls: 'home', scrollable: true, styleHtmlContent: true, items: [ { xtype: 'newslist' } ] } });

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• java.lang.Void in C#?

  - by user313661

  Hi, I am currently working with .Net 2.0 and have an interface whose generic type is used to define a method's return type. Something like interface IExecutor<T> { T Execute() { ... } } My problem is that some classes that implement this interface do not really need to return anything. In Java you can use java.lang.Void for this purpose, but after quite a bit of searching I found no equivalent in C#. More generically, I also did not find a good way around this problem. I tried to find how people would do this with delegates, but found nothing either - which makes me believe that the problem is that I suck at searching :) So what's the best way to solve this? How would you do it? Thanks!

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• Why does 'uses unit' disappear when I had a new unit ?

  - by TridenT

  I have a Unit test project for my Application using DUnit framework. This project have a unit surrounded by a $IFDEF to output test-results in a xml file instead of the gui or just command line. XML_OUTPUT define is enabled by switching the Build configuration. program DelphiCodeToDoc_Tests; uses TestFramework, TextTestRunner, Sysutils, Forms, GUITestRunner, {$IFDEF XML_OUTPUT} XmlTestRunner2 in 'DUnit_addon\XmlTestRunner2.pas', {$ENDIF} DCTDSetupTests in 'IntegrationTests\DCTDSetupTests.pas', ... This works perfectly. The issue starts when I'm adding a new unit to this project from the IDE (a new unit with 'FileNewUnit'). The Test project is now : uses TestFramework, TextTestRunner, Sysutils, Forms, GUITestRunner, DCTDSetupTests in 'IntegrationTests\DCTDSetupTests.pas', ... MyNewUnit in 'IntegrationTests\MyNewUnit.pas'; As you see, the test XML_OUTPUT has disappeared ... Each time I'm adding a unit, Delphi IDE deletes this test. Do you know why and how I can avoid it ?

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• OleDbException in my update method

  - by Hamed Norouzi

  Why do I have this error? The error message is: Syntax error in INSERT INTO statement. I want to add a record to my database, but it isn't working. Where is the problem? The code is: using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbDataAdapter DbDataAdabter = new OleDbDataAdapter(); DbDataAdabter.SelectCommand = new OleDbCommand("SELECT * FROM [Phone-Book]", connection); OleDbCommandBuilder cb = new OleDbCommandBuilder(DbDataAdabter); connection.Open(); DataRow dataRow = myDataset.Tables["salam"].NewRow(); dataRow[1] = textBox2.Text; dataRow[2] = textBox3.Text; dataRow[3] = textBox4.Text; dataRow[4] = textBox5.Text; dataRow.EndEdit(); myDataset.Tables["salam"].Rows.Add(dataRow); DbDataAdabter.Update(myDataset , "salam"); connection.Close(); connection.Dispose(); } }

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