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  • How to use length indicator in a C++ program

    - by cj
    I want to make a program in C++ that reads a file where each field will have a number before it that indicates how long it is. The problem is I read every record in object of a class; how do I make the attributes of the class dynamic? For example if the field is "john" it will read it in a 4 char array. I don't want to make an array of 1000 elements as minimum memory usage is very important.

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  • traits in php – any real world examples/best practices?

    - by Max
    Traits have been one of the biggest additions for PHP 5.4. I know the synatax and understand the idea behind traits, like horizontal code re-usage for common stuff like logging, security, caching etc. However, I still dont know yet how I would make use of traits in my projects. Are there any open source projects that already use traits? Any good articles/reading material on how to structure architectures using traits?

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  • Using many mutex locks

    - by hanno
    I have a large tree structure on which several threads are working at the same time. Ideally, I would like to have an individual mutex lock for each cell. I looked at the definition of pthread_mutex_t in bits/pthreadtypes.h and it is fairly short, so the memory usage should not be an issue in my case. However, is there any performance penalty when using many (let's say a few thousand) different pthread_mutex_ts for only 8 threads?

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  • The single most useful Emacs feature

    - by Readonly
    My primary editor is Emacs, but my usage habits and knowledge of features has barely changed over the last few years. What are the Emacs features that you use on a daily basis? Are there any little-known Emacs features that you find very useful? Edit: Made this into the recommended poll format...please put one feature per answer from now on.

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  • Qt releasing memory occopied by unneeded images

    - by Gerhman
    I have a QML Flickable with 3 QML image elements that cycle through 8 image files. My problem is for each new image it loads into memory it does not release the the unused image. This is causing memory usage to become double what is necessary at times. I would like to know if there is some function I can use to force it to unload all the unused images? If it makes a difference, this is mainly for Symbian.

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  • Recaptcha - Availability in China

    - by wacdany
    We are developing a site that will require the usage of a captcha service. Has anyone successfully use Google Recaptcha (https://www.google.com/recaptcha/intro/index.html) for a website for users from Mainland China? Did you have major problems with load-time? Did you experience any reliability problems? Any problems with the great firewall of china? Any experience that you can share is appreciated.

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  • Eclipse Memory usuage in Windows Vs Linux..

    - by Nareshreddy Kola
    Can someone please give me the details about the Eclipse memory usage in Windows XP and Linux? I heard Eclipse consumes less memory in Linux compared to Windows? Is it true? What ever the OS is, IDE will look for some amount memory so how will it vary with OS? Related Question: Eclipse memory use

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  • Enterprise Library Review?

    Hi, Is enterprise library for exception handling and logging efficient in terms of its memory usage for the functionality provided? What are the pros and cons? Thanks

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  • How to treat 64-bit words on a CUDA device?

    - by pikkio
    Hi, I'd like to handle directly 64-bit words on the CUDA platform (eg. uint64_t vars). I understand, however, that addressing space, registers and the SP architecture are all 32-bit based. I actually found this to work correctly (on my CUDA cc1.1 card): __global__ void test64Kernel( uint64_t *word ) { (*word) <<= 56; } but I don't know, for example, how this affects registers usage and the operations per clock cycle count.

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  • funny looking comments - c++

    - by Dr Deo
    when i read through source files of opensource projects i often come across some weird phrases in the comments /* @brief ...... @usage..... @remarks.... @par.... */ questions 1.What are they?(were not mentioned when i was learning c++) 2.Do they have any documentation(where)

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  • SQL and/or LINQ query for determining daily increases in viewers

    - by Gio
    We're montioring usage of a certain resources by monitoring users logins (We can see user logins growing daily). After filtering out repeat inter day logins for users, we'd like to track the # of users using the service each day, and then using that info to determine overall incremental gains for each calendar day. Our table is pretty simple: class ServiceLogin { String login; DateTime loginTime; }

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  • VS2010 has been released, so what do you hate or love about it?

    - by csharptest.net
    I recently installed the release version of Visual Studio 2010. So far I'm less than impressed with the rewrite and was wondering if I'm the only one. The thing I dislike the most is the inability to use the old-school MDI windows instead of the dreaded tabbed documents. For the other side the usage generator seems like it may prove useful in time. So what do you like or dislike about the changes to VS2010?

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  • ImmutableDictionary has no constructors defined

    - by lukasLansky
    So, I would like to write something like this: var d = new ImmutableDictionary<string, int> { { "a", 1 }, { "b", 2 } }; (using ImmutableDictionary from System.Collections.Immutable). It seems like a straightforward usage as I am declaring all the values upfront -- no mutation there. But this gives me error: The type 'System.Collections.Immutable.ImmutableDictionary<TKey,TValue>' has no constructors defined How I am supposed to create a new immutable dictionary with static content?

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  • Heap Behavior in C++

    - by wowus
    Is there anything wrong with the optimization of overloading the global operator new to round up all allocations to the next power of two? Theoretically, this would lower fragmentation at the cost of higher worst-case memory consumption, but does the OS already have redundant behavior with this technique, or does it do its best to conserve memory? Basically, given that memory usage isn't as much of an issue as performance, should I do this?

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