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• C++ methods which take templated classes as argument.

  - by Nils

  I have a templated class Vector<class T, int N> Where T is the type of the components (double for example) and n the number of components (so N=3 for a 3D vector) Now I want to write a method like double findStepsize(Vector<double,2> v) {..} I want to do this also for three and higher dimensional vectors. Of course I could just introduce further methods for higher dimensions, but the methods would have a lot of redundant code, so I want a more generic solution. Is there a way to create a method which takes a templated class without further specializing it (in this case without specifying T or N)? Like double findStepsize(Vector<T,N> v) ?

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• Same function on multiple div classes doesn't work

  - by Sebass van Boxel

  I'm doing something terribly wrong and just can't find the solution for it. Situation: I've got a number of products with a number of quotes per product. Those quote automatically scroll in a div. If the scroll reaches the last quote is scroll back to the first one. What works: The function basically works when it's applied on 1 div, but when applied on multiple div it doesn't scroll back to the first one or keeps scrolling endlessly. This is the function i've written for this: function quoteSlide(divname){ $total = ($(divname+" > div").size()) $width = $total * 160; $(divname).css('width', ($width)); console.log ($totalleft *-1); if ($width - 160 > $totalleft *-1){ $currentleft = $(divname).css('left'); $step = -160; $totalleft = parseInt($currentleft)+$step; }else{ $totalleft = 0; } $(divname).animate(     { left: $totalleft }, // what we are animating     'slow', // how fast we are animating     'swing', // the type of easing     function() { // the callback }); } It's being executed by something like: quoteSlide('#quotecontainer_1'); in combination with a setInterval so it keeps scrolling automatically. This is the jsFiddle where it goes wrong (So applied on more than 1 div) http://jsfiddle.net/FsrbZ/. This is the jsFiddle where everything goes okay. (applied on 1 div) When changing the following: quoteSlide('#quotecontainer_1'); quoteSlide('#quotecontainer_2'); setInterval(function() { quoteSlide('#quotecontainer_1'); quoteSlide('#quotecontainer_2'); }, 3400);? to quoteSlide('#quotecontainer_1'); setInterval(function() { quoteSlide('#quotecontainer_1'); }, 3400);? it does work... but only on 1 quotecontainer.

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• C++ Template Classes and Copy Construction

  - by themoondothshine

  Is there any way I can construct an new object from the given object if the template parameters of both objects are identical at run-time? For example: I have a template class with the declaration: template<typename _Type1, typename _Type2> class Object; Next, I have two instantiations of the template: template class Object<char, int>; template class Object<wchar_t, wint_t>; Now, I want to write a member function such as: template<typename _Type1, typename _Type2> Object<char, int> Object<_Type1, _Type2>::toCharObject() { if(__gnu_cxx::__are_same<_Type1, char>::__value) return *this; else { //Perform some kind of conversion and return an Object<char, int> } } I have tried a couple of techniques, such as using __gnu_cxx::__enable_if<__gnu_cxx::__are_same<_Type1, char>::__value, _Type1>::__type in a copy constructor for the Oject class, but I keep running into the error: error: conversion from ‘Object<wchar_t, wint_t>’ to non-scalar type ‘Object<char, int>’ requested Is there no way I can do this? Any help will be greatly appreciated!

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• Criteria: search for two different entity classes...

  - by RoCMe

  Hi! I have a "super entity" SuperEntity and three entities ChildEntity1, ..., ChildEntity3 which extends the super class. It's easy to search for all entities in the database, i.e. we could use session.createCriteria(SuperEntity.class); It's no problem to search for one specific entity type, too, just replace the SuperEntity with any of the children to look for entities of that type. But I have a problem when allowing 'multiple choice' for the types. I.e., it could be neccessary to search all entities of type 1 and 2, but not of type 3. A first idea was to create two independent queries and join the results in a final list - but that would destroy the paging which uses offset and limit functionality of the database... Is there a possibility in Criteria to join two different queries in one single result list? Kind regards, RoCMe

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• Pointer-like behavior in Java

  - by Shmoo

  I got the following: class A{ int foo; } class B extends A{ public void bar(); } I got a instance of A and want to convert it to an instance of B without losing the reference to the variable foo. For example: A a = new A(); a.foo = 2; B b = a; <-- what I want to do. //use b b.foo = 3; //a.foo should now be 3 Thanks for any help!

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• Best practice for referring to classes in CSS

  - by Mark Szymanski

  If you have an HTML page with a class in an element, for instance <div class="myClass"> would it be best to refer to it in the CSS as .myClass or div.myClass? Thanks in advance!

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• C++ array of classes

  - by nickik

  I working on a game but I have a problem with the initialization of the level. (feld is just field in german) class level{ private: feld spielfeld[10][10]; public: /* other staff */ void init_feld(); }; void level::init_feld() { for(int i=0;i!=10;i++){ for(int n=0;n!=10;n++){ spielfeld[i][n] = new feld(land, i, n); } } } The Error: Error: no match for »operator=« in »((level*)this)-level::spielfeld[i][n] = (operator new(24u), (, ((feld*))))« /home/nick/stratego/feld.h:18:11: Remark: candidate is: feld& feld::operator=(const feld&) Process terminated with status 1 (0 minutes, 0 seconds) 2 errors, 0 warnings

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• C# do nested classes need to be instantiated?

  - by JL

  In the following scenario: public class outerclass { public innerClass Ic {get;set} public class innerClass { } } Do you need to instantiate the inner class property before assigning values to it, like this? public class outerclass { public outerclass() { this.Ic = new innerClass(); } public innerClass Ic {get;set} public class innerClass { } }

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• Accessing variables in other classes (Java)

  - by George

  Why doesn't the following program return 0, since I am accessing p from a new A(), which has not had main called on it? public class A { public int p = 0; public static void main(String[] args) { p = Integer.parseInt(args[0]); new B().go(); } } class B { public void go() { System.out.println(new A().p); } }

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• Problem with C++ classes

  - by Mike

  I have a class defined called extBlock. I then make an instance of that class with this extBlock mainBlock = new extBlock(1, 1024); I get this error: error C2440: 'initializing' : cannot convert from 'extBlock *' to 'extBlock' Can anyone help me with why I am getting this error. I have seen examples online of declaring it like this with a pointer extBlock *mainBlock = new extBlock(1, 1024); But if I do it this way it does not let me call the functions of mainBlock

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• Fading between two classes in jquery

  - by Andy

  I would like to be able to fadeout this class <h2 class="care-home-fees"><a title="Care Home Fees" href="#">Text</a></h2> and fade in this <h2 class="care-home-fees-over"><a title="Care Home Fees" href="#">Text</a></h2> Notice there are two separate images Here is my current markup which doesnt seem to work $(document).ready(function(){ $("h2.care-home-fees").hover( function () { $(this).addClass("care-home-fees-over"); }, function () { $(this).removeClass("care-home-fees"); } ); }); and the button printed before any change <h2 class="care-home-fees"><a title="Care Home Fees" href="#">Text</a></h2>

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• VB.Net: Class Inheritance make one class another

  - by Kevin

  I have an organization that has clients and students, every student begins as a client. If I have a Client class and a student class that inherits from client. How do I make a client a student?

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• JQuery validation using is() and multiple CSS classes

  - by Alex

  Hi Folks, Trying to debug something that basically .trim()'s, .val()'s and .length's a textarea input as HTML below (truncated): <form id="Kontaktanfrage" method="post" action="tests/testform/"> ... <textarea cols="50" rows="8" id="el_12" name="FORM[Kontaktanfrage][el_12]" title="Ihre Nachricht: *" class="textarea required"></textarea> ... </form> JavaScript: function validateField(formId, fieldId) { if (fieldId) { var element = "form#"+formId+" input#"+fieldId; var fieldValue = jQuery.trim(jQuery(element).val()); var fieldLength = fieldValue.length; var fieldError = ""; if ($(element).is('.textarea.required') && fieldLength == 0) { fieldError = "error message"; } } } The above if check is never true. Using JQuery: 1.4.1. Having seen other examples online, I can't see what the difference should be. Feel free to test it in FireBug at (http://www.initiat.de/tests/testform/). Any help appreciated, can't see what I'm doing wrong.

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• Name hiding from inherited classes

  - by Mercerbearman

  I have the following sample code and I wanted to know the correct way to get access to the Pass method in the CBar class. Currently I have found 3 ways to get access to this method and they are as follows: Casting the object, ((CBar *) &foo)-Pass(1, 2, 3); Using this syntax, foo.CBar::Pass(1,2,3); Use the "using" syntax in the CFoo class declaration, using CBar::Pass. The following is an example of a simple project to test this capability. Foo.h #include "bar.h" class CFoo : public CBar { private: double m_a; double m_b; public: CFoo(void); ~CFoo(void); void Pass(double a, double b); }; Foo.cpp #include "Foo.h" CFoo::CFoo(void) { m_a = 0.0; m_b = 0.0; } CFoo::~CFoo(void) { } void CFoo::Pass(double a, double b) { m_a = a; m_b = b; } Bar.h class CBar { int m_x; int m_y; int m_z; public: CBar(void); ~CBar(void); void Pass(int x, int y, int z); }; Bar.cpp #include "Bar.h" CBar::CBar(void) { m_x = 0; m_y = 0; m_z = 0; } CBar::~CBar(void) { } void CBar::Pass(int x, int y, int z) { m_x = x; m_y = y; m_z = z; } And my main class DoStuff.cpp #include "DoStuff.h" #include "Foo.h" CDoStuff::CDoStuff(void) { } CDoStuff::~CDoStuff(void) { } int main() { CFoo foo, foo1, foo2; //This only gets to the Pass method in Foo. foo.Pass(2.5, 3.5); //Gets access to Pass method in Bar. foo1.CBar::Pass(5,10,15); //Can also case and access by location for the same result?? ((CBar *) &foo2)->Pass(100,200,300); return 0; } Are each of these options viable? Are some preferred? Are there pitfalls with using any one of the methods listed? I am especially curious about the foo.CBar::Pass(1,2,3) syntax. Thanks, B

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• C++ classes use of double colon [duplicate]

  - by user2444217

  This question already has an answer here: What does the :: mean in C++? 5 answers What Does :: Mean? 3 answers I am learning C++. Now I don't fully understand what this does Some_Class::SomeClass { etc... } I would do some research for myself, but I'm not sure where to begin or what's it called. Help would be appreciated.

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• Defining Proper Classes with Java

  - by user2579706

  Ok, I'm studying Java and have the following question: "Assume you defined a class named MyClass. A student wants to use your class and tries to declare an instance named myObj and instantiate it. He tried the following: MyObj MyClass = new MyClass( ); Why won't his code work? Show how he should correct it. " I'm not sure how to do this? Can anyone point me in the right direction? Many thanks.

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• Why am I seeing so many instantiable classes without state?

  - by futlib

  I'm seeing a lot of instantiable classes in the C++ and Java world that don't have any state. I really can't figure out why people do that, they could just use a namespace with free functions in C++, or a class with a private constructor and only static methods in Java. The only benefit I can think of is that you don't have to change most of your code if you later decide that you want a different implementation in certain situations. But isn't that a case of premature design? It could be turned into a class later, when/if it becomes appropriate. Am I getting this wrong? Is it not OOP if I don't put everything into objects (i.e. instantiated classes)? Then why are there so many utility namespaces and classes in the standard libraries of C++ and Java? Update: I've certainly seen a lot examples of this in my previous jobs, but I'm struggling to find open source examples, so maybe it's not that common after all. Still, I'm wondering why people do it, and how common it is.

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• WCF configuration and ISA Proxies

  - by Morten Louw Nielsen

  Hi, I have a setup with a .NET WCF Service hosted on IIS. The client apps are connecting to the service through a set of ISA proxy's. I don't know how many and don't know about their configuration etc. In the client apps I open a client to the service and make several calls via the same client. It works great in my office, but when I deploy at the customer (using the ISAs), after some calls, the connection breaks. In a successfull case, the client will maximum live a few seconds, but is that too much? I think there might be several proxyes. Maybe it's using load ballancing. pseudo code is something like this: WcfClient myClient = new WcfClient(); foreach (WorkItem Item in WorkItemsStack) myClient.ProcessItem(Item); myClient.Close(); I am thinking whether I have to do something like this foreach (WorkItem Item in WorkItemsStack) { WcfClient myClient = new WcfClient(); myClient.ProcessItem(Item); myClient.Close(); } Any one with experience with this field? Kind Regards, Morten, Denmark

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• Browser security when calling HTTP assets via a SWF on a HTTPS site

  - by Mark Ursino

  We have a site that runs on HTTPS and needs to pull in various JS assets to run a video player on the page. We get a browser security warning on this page because the JS files we are externally calling are being accessed via HTTP, not HTTPS. E.g. // HTTP reference on a HTTPS site <script src="http://the-cdn.tld/player.js"></script> Simply accessing this one JS assets via HTTP and not HTTPS will cause the browser security warning which we need to get rid of. The provider of the JS file does not support an HTTPS equivalent (like Google Analytics does). We would ideally love to just do the following, but the provider does not have this: // HTTPS reference on a HTTPS site <script src="https://the-cdn.tld/player.js"></script> One option we had was to just download a copy of the JS file and serve it on the HTTPS site, however we have concerns with this as it is not recommended by the provider and will not include updates from them. Assuming we cannot do that, we were thinking a possible other option would be to use a SWF file as a proxy. We were thinking that we could have one of our flash guys create a SWF that loads in the HTTP-served JS file to the page. We were wondering that if this SWF makes the request, would that prevent the browser from showing the security warning or not? I assumed that we would still see the warning since the SWF is still making the request through the browser, but I wanted to see what the hive mind thinks.

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• Multiple Ruby versions on one webserver?

  - by Legion

  The Ideal Using rvm, it would be awesome to be able to have multiple Rubies on one webserver, and through some sort of server configuration, be able to assign Ruby versions to different Rails/Sinatra/etc apps on a per-project basis. I am aware, from rvm's documentation, that Passenger only works with one Ruby at a time. :( The Compromise Failing that, it would be nice to at least be able to concoct a way to be able to assign projects to a Ruby 1.8 or a Ruby 1.9 interpreter. I've read that using Nginx as a reverse proxy allows running Apache and Nginx on the same box. Would it then be possible to have Apache+Passenger using one Ruby, and Nginx+Passenger using a different one? Maybe use something other than Passenger with Nginx? Am I Barking Up the Wrong Tree? Am I missing a good solution to this issue? Am I walking into a nightmare configuration situation? Is what I want even viable, or is it necessary to run another box to run a separate Ruby version?

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• Streaming local file from PHP while it's been written to by a CURL process

  - by Fahim

  I am creating a simple Proxy server for my website. Why I am not using mod_proxy and mod_cache is a different discussion. Here's the code: shell_exec("nohup curl --create-dirs -o {$write_path} {$source_url} > /dev/null 2> /dev/null & echo $!"); sleep(1); $read_speed = 65.5; # 65.5 kb/s download rate $handle = fopen($write_path, "rb"); $content_type = select_meta_item($headers, 'Content-Type'); $file_size = select_meta_item($headers, 'Content-Length'); send_headers($content_type, $file_size); flush(); while (!feof($handle)) { echo fread($handle, round($read_speed * 1024)); flush(); sleep(1); } fclose($handle); Streaming an MP3 doesn't work using this method. Plays in Chrome, but not in Firefox. Initially I'll be using this to stream MP3 files through Long Tail's JW Player. If it all works out, I'll also be using this to send ZIP files.

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• Android: Unable to make httprequest behind firewall

  - by Yang

  The standard getUrlContent works welll when there is no firewall. But I got exceptions when I try to do it behind a firewall. I've tried to set "http proxy server" in AVD manager, but it didn't work. Any idea how to correctly set it up? protected static synchronized String getUrlContent(String url) throws ApiException { if(url.equals("try")){ return "thanks"; } if (sUserAgent == null) { throw new ApiException("User-Agent string must be prepared"); } // Create client and set our specific user-agent string HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(url); request.setHeader("User-Agent", sUserAgent); try { HttpResponse response = client.execute(request); // Check if server response is valid StatusLine status = response.getStatusLine(); if (status.getStatusCode() != HTTP_STATUS_OK) { throw new ApiException("Invalid response from server: " + status.toString()); } // Pull content stream from response HttpEntity entity = response.getEntity(); InputStream inputStream = entity.getContent(); ByteArrayOutputStream content = new ByteArrayOutputStream(); // Read response into a buffered stream int readBytes = 0; while ((readBytes = inputStream.read(sBuffer)) != -1) { content.write(sBuffer, 0, readBytes); } // Return result from buffered stream return new String(content.toByteArray()); } catch (IOException e) { throw new ApiException("Problem communicating with API", e); } }

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• Outgoing UDP sniffer in python?

  - by twneale

  I want to figure out whether my computer is somehow causing a UDP flood that is originating from my network. So that's my underlying problem, and what follows is simply my non-network-person attempt to hypothesize a solution using python. I'm extrapolating from recipe 13.1 ("Passing Messages with Socket Datagrams") from the python cookbook (also here). Would it possible/sensible/not insane to try somehow writing an outgoing UDP proxy in python, so that outgoing packets could be logged before being sent on their merry way? If so, how would one go about it? Based on my quick research, perhaps I could start a server process listening on suspect UDP ports and log anything that gets sent, then forward it on, such as: import socket s =socket.socket(socket.AF_INET, socket.SOCK_DGRAM) s.bind(("", MYPORT)) while True: packet = dict(zip('data', 'addr'), s.recvfrom(1,024)) log.info("Recieved {data} from {addr}.".format(**packet)) But what about doing this for a large number of ports simultaneously? Impractical? Are there drawbacks or other reasons not to bother with this? Is there a better way to solve this problem (please be gentle).

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• How to find the first declaring method for a reference method

  - by Oliver Gierke

  Suppose you have a generic interface and an implementation: public interface MyInterface<T> { void foo(T param); } public class MyImplementation<T> implements MyInterface<T> { void foo(T param) { } } These two types are frework types. In the next step I want allow users to extend that interface as well as redeclare foo(T param) to maybe equip it with further annotations. public interface MyExtendedInterface extends MyInterface<Bar> { @Override void foo(Bar param); // Further declared methods } I create an AOP proxy for the extended interface and intercept especially the calls to furtherly declared methods. As foo(…) is no redeclared in MyExtendedInterface I cannot execute it by simply invoking MethodInvocation.proceed() as the instance of MyImplementation only implements MyInterface.foo(…) and not MyExtendedInterface.foo(…). So is there a way to get access to the method that declared a method initially? Regarding this example is there a way to find out that foo(Bar param) was declared in MyInterface originally and get access to the accoriding Method instance? I already tried to scan base class methods to match by name and parameter types but that doesn't work out as generics pop in and MyImplementation.getMethod("foo", Bar.class) obviously throws a NoSuchMethodException. I already know that MyExtendedInterface types MyInterface to Bar. So If I could create some kind of "typed view" on MyImplementation my math algorithm could work out actually.

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• Building "isolated" and "automatically updated" caches (java.util.List) in Java.

  - by Aidos

  Hi Guys, I am trying to write a framework which contains a lot of short-lived caches created from a long-living cache. These short-lived caches need to be able to return their entier contents, which is a clone from the original long-living cache. Effectively what I am trying to build is a level of transaction isolation for the short-lived caches. The user should be able to modify the contents of the short-lived cache, but changes to the long-living cache should not be propogated through (there is also a case where the changes should be pushed through, depending on the Cache type). I will do my best to try and explain: master-cache contains: [A,B,C,D,E,F] temporary-cache created with state [A,B,C,D,E,F] 1) temporary-cache adds item G: [A,B,C,D,E,F] 2) temporary-cache removes item B: [A,C,D,E,F] master-cache contains: [A,B,C,D,E,F] 3) master-cache adds items [X,Y,Z]: [A,B,C,D,E,F,X,Y,Z] temporary-cache contains: [A,C,D,E,F] Things get even harder when the values in the items can change and shouldn't always be updated (so I can't even share the underlying object instances, I need to use clones). I have implemented the simple approach of just creating a new instance of the List using the standard Collection constructor on ArrayList, however when you get out to about 200,000 items the system just runs out of memory. I know the value of 200,000 is excessive to iterate, but I am trying to stress my code a bit. I had thought that it might be able to somehow "proxy" the list, so the temporary-cache uses the master-cache, and stores all of it's changes (effectively a Memento for the change), however that quickly becomes a nightmare when you want to iterate the temporary-cache, or retrieve an item at a specific index. Also given that I want some modifications to the contents of the list to come through (depending on the type of the temporary-cache, whether it is "auto-update" or not) and I get completly out of my depth. Any pointers to techniques or data-structures or just general concepts to try and research will be greatly appreciated. Cheers, Aidos

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