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  • a class function with if(this==NULL) test got compiled?

    - by James
    I saw this code snippet during our lab and it actually compiles in MSVC2008 and G++. void LinkList< class T ::Insert(T n) { if (this == NULL) // some code here } As far as I know the this must not be null since you cannot call a class functions in c++ if it wasn't instantiated. Is this a valid code? if so what's the reason behind and where it can be useful?

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  • real time scenario between interface/abstract class ?

    - by JavaUser
    Hi , Please give me a real time simple example for the below questions : Where to use interface rather abstract class Where to use abstract class rather interface I need code snippet for both . Which takes low memory and which performs well . Do I need to consider the design aspect also? What is the conceptual difference not the syntactical difference .

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  • Simple numpy question

    - by dassouki
    I can't get this snippet to work: #base code A = array([ [ 1, 2, 10 ], [ 1, 3, 20 ], [ 1, 4, 30 ], [ 2, 1, 15 ], [ 2, 3, 25 ], [ 2, 4, 35 ], [ 3, 1, 17 ], [ 3, 2, 27 ], [ 3, 4, 37 ], [ 4, 1, 13 ], [ 4, 2, 23 ], [ 4, 3, 33 ] ]) # Number of zones zones = unique1d(A[:,0]) for origin in zones: for destination in zones: if origin != destination: A_ik = A[(A[:,0] == origin & A[:,1] == destination), 2]

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  • How does this XPATH query differentiate?

    - by Soham
    I am kind of repeating this question because mostly due to my own ignorance, I could not fully understand the innards. Given this HTML snippet <td valign=top class="tim_new"><a href="/stocks/company_info/pricechart.php?sc_did=MI42" class="tim_new">3M India</a></td> <td class="tim_new" valign=top><a href='/stocks/marketstats/indcomp.php?optex=NSE&indcode=Diversified' class=tim>Diversified</a></td> How does this XPATH //a[@class='tim_new'] differentiate between line 1 and line 2.

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  • Design Patterns : Question about "Types"

    - by contactmatt
    Would someone please explain to me what the below paragraph means? This is a snippet from "Design Patterns: Elements of Reusable OO software" Part of an object's interface may be characterized by one type, and other parts by other types. Two objects of the same type need only share parts of their interfaces. Interfaces can contain other interfaces as subsets. - Design Patterns - Elements of Reusable OO software, pg 13

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  • HTML tag to select Flash-player plugin to play flv

    - by Microkernel
    Hi all, If I have .flv files on my server at some location like http://www.example.com/archive/test.flv. In HTML page how can I tell the browser to use Flash player to play this video like youtube videos are played. Can someone tell me how to do this? Regards, Microkernel PS: I am noober than noob in web dev, so please give some code snippet or answers that beginners like me can understand. Thank you

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  • monotouch play music when device is locked

    - by Ali Shafai
    I'm trying to make my monotouch app continue playing when the device is locked, I found this snippet in ObjC, was wondering if mt already has bindings for it or not. AudioSessionInitialize (NULL,NULL,interruptionListenerCallback,self); UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback; AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory);

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  • dynamically scan pictures in a folder and display using jquery slideshow

    - by Nazmin
    guys, anyone know how to scan a folder using jquery or javascript code snippet, after that get a picture file name and embed in <li></li> or <div></div>, i've used php code to read through the folder and loop through the element to display the thumbnails and all, but it's not work well. I've try on galleria, gallerific, galleryView jquery slideshow plugin but those might not work well with php processing because of predefined configuration or something, can anyone tweak or hack these gallery to dynamically read an image from a folder?

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  • In MS Access form, how to color background of selected record?

    - by PowerUser
    I have a somewhat complicated looking Access Form with a continuous display (meaning multiple records are shown at once). I'd like to change the background color of the selected record only so the end-user can easily tell which record they are on. I'm thinking of perhaps a conditional format or maybe something like this: Private Sub Detail_HasFocus() Detail.BackColor(me.color)=vbBlue End Sub and something similar for when that row loses focus. This code snippet obviously won't work, but it's the kind of code I'd like to achieve.

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  • What's pcap_pkthdr there for?

    - by httpinterpret
    Code snippet from here: void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data) { .... /* retireve the position of the ip header */ ih = (ip_header *) (pkt_data + 14); //length of ethernet header .... What's const struct pcap_pkthdr *header for, when do we need it, how is it populated (since there is no such info in the packet itself as below)?

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  • How to specify dll onload function for mingw32?

    - by aking1012
    I can compile DLLs properly using mingw and do the exports/imports stuff. What I am looking for is defining the dll onload function properly as you would in MS VC products. Google didn't turn up anything. Anyone have any ideas or a link to a tutorial? It was suggested that this code snippet be added to the question: extern "C" DLL_EXPORT BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD Reason, LPVOID LPV) And yes, this is what I am trying to do, but with mingw.

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  • Programatic cache creation

    - by Pablo Fernandez
    I switched from xml to programmatically cache creation and now I can't retrieve my cache by name. Here's a code snippet that shows what I'm doing maybe you can spot an obvious error? http://gist.github.com/405546 (I'm only showing the relevant lines here).

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  • jQueryt Search for Text in a Variable?

    - by thatryan
    I have a variable that contains some text, some html, basically can be a string. I need to search the variable for a specific string to process that variable differently if it is contained. Here is a snippet of what I am trying to do, does not work obviously :) $.each(data.results, function(i, results) { var text = this.text var pattern = new RegExp("^[SEARCHTERM]$"); if(pattern.test( text ) ) alert(text); //was hoping this would alert the SEARCHTERM if found...

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  • Mixing two wav music files of different size

    - by iphoneDev
    Hi, I want to mix audio files of different size into a one single .wav file. There is a sample through which we can mix files of same size [(http://www.modejong.com/iOS/#ex4 )(Example 4)]. I modified the code to get the mixed file as a .wav file. But I am not able to understand that how to modify this code for unequal sized files. If someone can help me out with some code snippet,i'll be really thankful.

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  • How to remove the port number from a url string

    - by Brono The Vibrator
    I have the following code snippet: string tmp = String.Format("javascript:window.open('{0}');", url); ClientScript.RegisterClientScriptBlock(this.GetType(), "NewWindow", tmp); the url generated by this code include the port number and I think that is happening becasue port 80 is used by the website and in this code I am trying to load a page from a virtual directory of the website. Any ideas on how to supress the port number in the url string generated by this code?

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  • Where should I put the code for a Django admin action for a third party app?

    - by charlie
    Hi, I'm new to Django. I am writing my own administrative action for a third party app/model, similar to this: http://mnjournal.com/post/2009/jul/10/adding-django-admin-actions-contrib-apps/ It's a simple snippet of code. I'm just wondering where people suggest that I put it. I don't want to put in the third party app because I might need to update to a newer version at some point. Thanks.

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  • Why can I set an anonymous enum equal to another in C but not C++?

    - by samoz
    I have the following code snippet: enum { one } x; enum { two } y; x = y; That will compile in C, but in C++, I get the following error: test.c:6: error: cannot convert ‘main()::<anonymous enum>’ to ‘main()::<anonymous enum>’ in assignment Can someone explain to me why this is happening? I would prefer an answer with some specifics about why the compiler behaves this way, rather than just "You can't do that"

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