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  • Concepts: Channel vs. Stream

    - by hotzen
    Hello, is there a conceptual difference between the terms "Channel" and "Stream"? Do the terms require/determine, for example, the allowed number of concurrent Consumers or Producers? I'm currently developing a Channel/Stream of DataFlowVariables, which may be written by one producer and read by one consumer as the implementation is destructive/mutable. Would this be a Channel or Stream, is there any difference at all? Thanks

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  • UTC time stamp on Windows

    - by Arman
    I have a buffer with the UTC time stamp in C, I broadcast that buffer after every ten seconds. The problem is that the time difference between two packets is not consistent. After 5 to 10 iterations the time difference becomes 9, 11 and then again 10. Kindly help me to sort out this problem. I am using <time.h> for UTC time.

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  • casting needed?

    - by Joo Park
    what is the difference between these two lines of code? Is there a difference? NSManagedObject* object = (NSManagedObject*)[self.fetchedResults objectAtIndexPath:indexPath]; NSManagedObject* object = [self.fetchedResults objectAtIndexPath:indexPath];

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  • sin v/s sinf fucntion in C

    - by user319873
    Hi Guys, I am trying to use sinf function in my C Program and it does give me undefined reference under MSVC 6.0 but sin works fine. This make me curious to find the difference between sin and sinf. What is the logical difference between sin and sinf(). How can I implement my own sinf functionality?

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  • volatile vs. mutable in C++

    - by skydoor
    Hi I have a question about the difference between volatile and mutable. I noticed that both of the two means that it could be changed. What else? Are they the same thing? What's the difference? Where are they applicable? Why the two ideas are proposed? How to use them in different way? Thanks a lot.

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  • jQuery $.each(arr, foo) versus $(arr).each(foo)

    - by Brian M. Hunt
    In jQuery, what's the difference between the following two constructions of jQuery.each: // Given var arr = [1,2,3,4], results = [], foo = function (index, element) { /* something done to/with each element */ results.push(element * element); // arbitrary thing. } // construction #1 $.each(arr, foo); // results = [1,4,9,16] // construction #2 $(arr).each(foo); // results = [1,4,9,16] Is there any difference, or is it purely syntax?

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  • What's faster Model.get(keys) or Model.get_by_id(ids, parent=None)

    - by WooYek
    I'm wondering is there a difference in terms of computing cost for the Model.get(keys) and Model.get_by_id(ids, parent=None) methods? Is there a server side computing advantage of using numeric id's over encoded string keys, or other way around? How big is the difference? PS. Sorry, if it's a dupe. I'm sure I read an article about it, but I cannot find it now.

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  • main vs initialize in Ruby

    - by Dave
    Okay, so I've looked through a couple of my ruby books and done some googling to no avail. What is the difference between main and initialize in Ruby? I've seen code that uses class Blahblah def main some logic here end #more methods... end and then calls it using Blahblah.new. Isn't new reserved only for initialize? if not, then what's the difference between the two?

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  • is versus as pl/sql

    - by sqlgrasshopper5
    I thought that oracle treats both "is" and "as" same for functions and procedures.I tried googling with "pl/sql is vs as" and got the following link which says both are the same. http://stackoverflow.com/questions/2338408/is-vs-as-keywords-for-pl-sql-oracle-function-or-procedure-creation But I found http://www.adp-gmbh.ch/ora/plsql/coll/declaration.html#index_by which seems to indicate there is a difference. Could somebody (list/point me to a link) the other contexts where using "is/as" makes a difference?. Thanks.

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  • Websites and web applications?

    - by IP
    (From the point of view of a user, not how it's built or which option is selected in Visual Studio) ...What is the difference between a "website" and a "web application"? Is there a difference? Are there characteristics that characterise the two?

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  • 'AND' vs '&&' as operator

    - by ts
    Actually, i am facing a codebase where developpers decided to use 'AND' and 'OR' instead of '&&' and '||'. I know that there is difference in operators precedence (&& goes before 'and'), but with given framework (prestashop to be precise) is clearly not a reason. So, my question: which version are you using? Is 'and' more readable than '&&'? || there is ~ difference?

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  • Memory leak appears only when multiprocessing

    - by Sandro
    I am trying to use python's multiprocessing library to hopefully gain some performance. Specifically I am using its map function. Now, for some reason when I swap it out with its single threaded counterpart I don't get any memory leaks over time. But using the multiprocessing version of map causes my memory to go through the roof. For the record I am doing something which can easily hog up loads of memory, but what would the difference be between the two to cause such a stark difference?

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  • Disadvantage of unlifted type products?

    - by peaker
    In Haskell, lifted type products mean that there's a semantic difference between (a,b,c) and (a, (b, c)). If all pattern matches of all products was always irrefutable, then there would be no difference, and (a, b, c) could be syntactic sugar for (a, (b, c)). Why did Haskell choose to lift type products?

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  • operator overloading

    - by cpp_Beginner
    Hi, Could anybody tell me the difference between operator overloading using the friend keyword and as a member function inside a class? also what is the difference incase of any unary operator overloading i.e., as a friend and as a member function

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  • jQuery oembed plugin z-index problem

    - by Ben
    I'm using the jQuery oembed plugin to display videos from a Vimeo feed. The only problem is they display over the top of my navigation menu. I have tried setting the z-index of the menu but this makes no difference. A common suggestion seems to be to set the wmode parameter to transparent or opaque. However, passing this as a parameter to the oembed function makes no difference. Thanks

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  • Initialisation of Objects Syntax question

    - by Brock Woolf
    When I initialise a struct in C (Node is the struct): struct Node { /* Non-Relevant code */ }; This works: Node *rootNode = new Node(); but so does this: Node *rootNode = new Node; Is there a difference, and what is the difference between using () or not using the brackets? Just off memory, I think the same applies above for C++ object initialisations. What is happening here?

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  • QWebFrame::evaluateJavaScript vs. script-tag in HTML

    - by jwg
    Hi, I want to develop an application that uses QtWebKit and JQuery. What I need to know is, is there any difference between reading JQuery from a file and evaluateJavaScript it, or embedding it as a script tag within the "page" that is displayed within the widget? If there is a difference, I am curious if anyone could explain why it would be. As far as I understood it, evaluateJavaScript() would feed the script parameter to the JavaScript interpreter, which interprets it in the current page's context. Thanks.

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  • Pascal's repeat... until vs. C's do... while

    - by Bob
    In C there is a do while loop and pascal's (almost) equivalent is the repeat until loop, but there is a small difference between the two, while both structures will iterate at least once and check whether they need to do the loop again only in the end, in pascal you write the condition that need to met to terminate the loop (REPEAT UNTIL something) in C you write the condition that need to be met to continue the loop (DO WHILE something). Is there a reason why there is this difference or is it just an arbitrary decision?

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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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  • COBOL Data types

    - by Manasi
    Hi, I have confusion regarding COBOL data types. Like in many interviews it is asked to explain the difference between COMP-3 and COMP... what is the exact difference? what is the meaning of usage modes in COBOL and how is it related to data types? Thanks and Regards, Manasi Kulkarni

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  • Which is faster??

    - by kaki
    is opening a large file once reading it completely once to list faster (or) opening smaller files whose total sum of size is equal to large file and loading smaller file into list manupalating one by one faster? which is faster?? is the difference is time large enough to impact my program?? total time difference of lesser then of 30 sec is negligible for me

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