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  • Calling different functions depending on the template parameter c++

    - by Noman Javed
    I want to have something like that class A { public: Array& operator()() { . . . } }; class B { public: Element& operator[](int i) { ... } }; template<class T> class execute { public: output_type = operator()(T& t) { if(T == A) Array out = T()(); else { Array res; for(int i=0 ; i < length; ++i) a[i] = t[i]; } } }; There are two issues here 1. Meta-function replacing if-else in the execute operator() 2. Return type of execute operator() Thanks in anticipation Noman

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  • Why does the right-shift operator produce a zero instead of a one?

    - by mrt181
    Hi, i am teaching myself java and i work through the exercises in Thinking in Java. On page 116, exercise 11, you should right-shift an integer through all its binary positions and display each position with Integer.toBinaryString. public static void main(String[] args) { int i = 8; System.out.println(Integer.toBinaryString(i)); int maxIterations = Integer.toBinaryString(i).length(); int j; for (j = 1; j < maxIterations; j++) { i >>= 1; System.out.println(Integer.toBinaryString(i)); } In the solution guide the output looks like this: 1000 1100 1110 1111 When i run this code i get this: 1000 100 10 1 What is going on here. Are the digits cut off? I am using jdk1.6.0_20 64bit. The book uses jdk1.5 32bit.

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  • What is ethical/unethical while seeking help on the web with programming assignments?

    - by HelpNeeder
    I have used the web and Stack Overflow extensively during the past month or so in creating my final project for my C# class. I have used so much code that I didn't write myself that I feel I am being unethical by not giving proper credit to the people who helped me; or the websites that have provided excellent examples. Is it unethical to publish work which was created by me, even though its hardest problems were solved by other people? Should I credit these people for helping me with my assignment? Or the web sites which provided examples?

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  • Error is occured when I try to build and install Numeric-24.2, anybody, help please me

    - by vpras
    vprasopchai@vprasopchai-Aspire-4720Z:~/Downloads/Numeric-24.2$ python setup.py build WARNING: '' not a valid package name; please use only.-separated package names in setup.py WARNING: '' not a valid package name; please use only.-separated package names in setup.py running build running build_py running build_ext MA Version 12.2.0 Numeric Version 24.2 vprasopchai@vprasopchai-Aspire-4720Z:~/Downloads/Numeric-24.2$ python setup.py install WARNING: '' not a valid package name; please use only.-separated package names in setup.py WARNING: '' not a valid package name; please use only.-separated package names in setup.py running install running build running build_py running build_ext running install_lib creating /usr/local/lib/python2.7/dist-packages/Numeric error: could not create '/usr/local/lib/python2.7/dist-packages/Numeric': Permission denied

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  • How to model a system to help my team grasp the project's bigger picture? [closed]

    - by user1796528
    According to the software engineering point of view, I should model the system to make it easier for other people to understand well what they work on. To do so, I have used the Dia drawing program. But, after having used Dia for some time, I find that it falls short in helping me to correctly and efficiently model my project. How do you usually tackle this problem (modelling a project in the large) and what tools would you recommend for the job, and why?

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  • Does knowing a Natural Language well help with Programming?

    - by Earlz
    We all hear that math at least helps a little bit with programming. My question though, does English or other natural language skills help with programming? I know it has to help with technical documentation, but what about actual programming? Are certain constructs in a programming language also there in natural languages? Does knowing how to write a 20 page research paper help with writing a 20k loc programming project?

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  • insert ... select with divide operator in select errors?

    - by Mark
    Hi, the following query CREATE TABLE IF NOT EXISTS XY ( x INT NOT NULL , y FLOAT NULL , PRIMARY KEY(x) ) INSERT INTO XY (x,y) (select 1 as x ,(1/7) as y); errors with Error code 1064, SQL state 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INSERT INTO XY (x,y) (select 1 as x ,(1/7) as y)' at line 7 Line 1, column 1 any ideas?

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  • System crashed while upgrading, now unable to recover. Please help

    - by longloop
    Yesterday while upgrading from 11.4 to 11.10, due to power cut my system crashed. Ubuntu is unable to boot. While booting I get two options in grub, one is for recovery mode and the other is for normal ubuntu booting (and others are also thr for mem check and booting to windows). When I try to boot it normally, it pauses booting while displaying ' Checking battery statues' . Though i am not using a laptop, I am on a desktop. And In recovery mode the menu has 4 options - resume boot, fsck , remount and root ( to goto shell prompt) . If I go to shell and type ' apt-get dist upgrade' , it shows - W: not using locking for read only lock file /var/lib/dpkg/lock E:unable to write to /var/cache/apt E:The package lists or status files could not be parsed or opened. Please instruct me to recover from this situation.

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  • ubuntu 3D is slow on Nvidia driver,any help?

    - by ahmed
    I have installed ubuntu 12.04 and it's very slow in moving any windows and in 3d animation and the problem is from the Nvidia driver and when I switched to the Ubuntu 2d it works fine but without the 3d animations in ubuntu 3d so this make me remove ubuntu until the yfix this problem so , have they fixed this problem or not , If not , is there any solution to enable the 3d animation ((I am a new user to ubuntu and medium experienced ,so please I don't want complexed answer :)

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  • Is there a way to help streamline your typical developers discussions?

    - by Jasper Kennis
    Often, my colleagues and I run into specific problems, for example what's the best way to deploy this, or would this or that technique be a good one to use, or just "hey, have you seen that new thing". However at the moment this communication goes via mail, or skype, or twitter, and a lot of information becomes hard to find very quickly. Is there a service or methodology to keep this kind of information ordered and traceable?

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  • What are the best tools to help work with large ant files.

    - by klfox
    I just started working at a company that has a very large ant build file that imports lots of other large/small ant files. Needless to say it's giving me a headache trying to figure out what is going on. What are the best tools out there for: Getting some kind of concise answer on what is happening Visualizing the various targets Seeing performance on tasks Can be multiple tools. Any other tips/suggestions? I tagged this as java since I don't have the reputation to create an ant tag.

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  • What reference point/ tutorial could I use to help me make a "Ball rolling" game in flash?

    - by user1798964
    I am a complete newbie to programming, only took high school Computer science so I kind of know what im doing, I just want to know how I can make a ball rolling game that I want to make, could anyone show me an example of a good "ball rolling game" that has good physics and everything, I have tried to use Box2D for the physics portion of the game, but I found that using that is just code and I can't figure out how to make the graphics and details of the world I want to make in my game, all I would like to do would have a game that has the collision detection and physics of box2d only apply to one ball in it and use the left and right keys to move it. sorry if I am too unclear, if anyone could show a tutorial or something to me on how to make a proper "Ball rolling" game that has good physics that would be appreciated, thank you for taking the time to read this

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  • How to skip an empty LIKE operator in a multiple LIKE query?

    - by alex
    I notice my query doesn't behave correctly if one of the like variables is empty: SELECT name FROM employee WHERE name LIKE '%a%' AND color LIKE '%A%' AND city LIKE '%b%' AND country LIKE '%B%' AND sport LIKE '%c%' AND hobby LIKE '%C%' Now when a and A are not empty it works but when a, A and c are not empty the c part is not excuted so it seems? How can I fix this?

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  • Is there a .NET class that represents operator types?

    - by user323774
    I would like to do the following: *OperatorType* o = *OperatorType*.GreaterThan; int i = 50; int increment = -1; int l = 0; for(i; i o l; i = i + increment) { //code } this concept can be kludged in javascript using an eval()... but this idea is to have a loop that can go forward or backward based on values set at runtime. is this possible? Thanks

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  • Can anyone help with this exception, please? (2 replies)

    Hi all The following stacktrace is generated in the environment and action detailed below, environment: vs2005, c#, winforms, dataset, detail view, bindingNavigator control user action: load form, click addnew button, then click movefirst button I have tried using the bindingNavigator MoveFirstItem Click to check on null values, but the event is not raised before this exception, and I can not find...

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  • Javascript === vs == : Does it matter which "equal" operator I use?

    - by bcasp
    I'm using JSLint to go through some horrific JavaScript at work and it's returning a huge number of suggestions to replace == with === when doing things like comparing 'idSele_UNVEHtype.value.length == 0' inside of an if statement. I'm basically wondering if there is a performance benefit to replacing == with ===. Any performance improvement would probably be welcomed as there are hundreds (if not thousands) of these comparison operators being used throughout the file. I tried searching for relevant information to this question, but trying to search for something like '=== vs ==' doesn't seem to work so well with search engines...

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  • anyone can help me with accessing folders on windows from ubuntu?

    - by IslamShalaby
    hello all i had ubuntu on my desktop but i had lots of problems with it so i turned back to windows... now im having the biggest problem ever :S all my dad was in a folder that i created on ubuntu OS and i copied em to another HDD and then i removed it and putted my HDD and removed all the partitions and made the windows parttions once i copied those folders back to my HDD ( using windows 7 ) i found those folders size 0KB when i try to open them i get error.. pleaaase tell me what to do.. i was using my /home partition as ext4.. waiting for answer :(

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  • Why would you use the ternary operator without assigning a value for the "true" condition?

    - by RickNotFred
    In the Android open-source qemu code I ran across this line of code: machine->max_cpus = machine->max_cpus ?: 1; /* Default to UP */ It this just a confusing way of saying: if (machine->max_cpus) { ; //do nothing } else { machine->max_cpus = 1; } If so, wouldn't it be clearer as: if (machine->max_cpus == 0) machine->max_cpus = 1; Interestingly, this compiles and works fine with gcc, but doesn't compile on http://www.comeaucomputing.com/tryitout/ .

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  • is the + in += on a Map a prefix operator of =?

    - by Steve
    In the book "Programming in Scala" from Martin Odersky there is a simple example in the first chapter: var capital = Map("US" -> "Washington", "France" -> "Paris") capital += ("Japan" -> "Tokyo") The second line can also be written as capital = capital + ("Japan" -> "Tokyo") I am curious about the += notation. In the class Map, I didn't found a += method. I was able to the same behaviour in an own example like class Foo() { def +(value:String) = { println(value) this } } object Main { def main(args: Array[String]) = { var foo = new Foo() foo = foo + "bar" foo += "bar" } } I am questioning myself, why the += notation is possible. It doesn't work if the method in the class Foo is called test for example. This lead me to the prefix notation. Is the + a prefix notation for the assignment sign (=)? Can somebody explain this behaviour?

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  • AHCI, Power Mode S3 and HPET 64bit - please help with these settings!

    - by thetattoo
    my problem is the that for a Hackintosh (unofficial PC running OS X) I needed to set AHCI, Power Mode S3 and HPET 64bit. Now, I want to install Ubuntu (when 12.04 comes out) and was wondering if these settings will be right to use for Ubuntu. I read that AHCI is how the hard disks are accessed, Power Mode S3 is how suspend works with the RAM but couldn't figure out if using HPET 64bit makes any difference than HPET 32bit. What I would like is an explanation of what these BIOS settings do and what is best for Ubuntu. Thank you very much

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  • C# performance of static string[] contains() (slooooow) vs. == operator

    - by Andrew White
    Hiya, Just a quick query: I had a piece of code which compared a string against a long list of values, e.g. if(str == "string1" || str = "string2" || str == "string3" || str = "string4". DoSomething(); And the interest of code clarity and maintainability I changed it to public static string[] strValues = { "String1", "String2", "String3", "String4"}; ... if(strValues.Contains(str) DoSomething(); Only to find the code execution time went from 2.5secs to 6.8secs (executed ca. 200,000 times). I certainly understand a slight performance trade off, but 300%? Anyway I could define the static strings differently to enhance performance? Cheers.

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