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  • Design of std::ifstream class

    - by Nawaz
    Those of us who have seen the beauty of STL try to use it as much as possible, and also encourage others to use it wherever we see them using raw pointers and arrays. Scott Meyers have written a whole book on STL, with title Effective STL. Yet what happened to the developers of ifstream that they preferred char* over std::string. I wonder why the first parameter of ifstream::open() is of type const char*, instead of const std::string &. Please have a look at it's signature: void open(const char * filename, ios_base::openmode mode = ios_base::in ); Why this? Why not this: void open(const string & filename, ios_base::openmode mode = ios_base::in ); Is this a serious mistake with the design? Or this design is deliberate? What could be the reason? I don't see any reason why they have preferred char* over std::string. Note we could still pass char* to the latter function that takes std::string. That's not a problem! By the way, I'm aware that ifstream is a typedef, so no comment on my title.:P. It looks short that is why I used it. The actual class template is : template<class _Elem,class _Traits> class basic_ifstream;

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  • How to code for Alternate Course AKA Rainy Day Scenary?

    - by janetsmith
    Alternate course is something when user doesn't do what you expected, e.g. key in wrong password, pressing back button, or database error. For any programming project, alternate course accounts for more than 50% of a project timeline. It is important. However, most computer books only focus on Basic Course (when everything goes fine). Basic course is rather simple, compared to Alternate course, because this is normally given by client. Alternate course is what we, as a programmer or Business Analyst needs to take care of. Java has some built-in mechanism (try-catch) to force us to handle those unexpected behavior. The question is, how to handle them? Any pattern to follow? Any guideline or industry practice for handling alternate course?

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  • Simplest way to mix sequences of types with iostreams?

    - by Kylotan
    I have a function void write<typename T>(const T&) which is implemented in terms of writing the T object to an ostream, and a matching function T read<typename T>() that reads a T from an istream. I am basically using iostreams as a plain text serialisation format, which obviously works fine for most built-in types, although I'm not sure how to effectively handle std::strings just yet. I'd like to be able to write out a sequence of objects too, eg void write<typename T>(const std::vector<T>&) or an iterator based equivalent (although in practice, it would always be used with a vector). However, while writing an overload that iterates over the elements and writes them out is easy enough to do, this doesn't add enough information to allow the matching read operation to know how each element is delimited, which is essentially the same problem that I have with a single std::string. Is there a single approach that can work for all basic types and std::string? Or perhaps I can get away with 2 overloads, one for numerical types, and one for strings? (Either using different delimiters or the string using a delimiter escaping mechanism, perhaps.)

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  • Should I consider memmove() O(n) or O(1) ?

    - by Andrei Ciobanu
    Hello, this may be a silly question, but I want to calculate the complexity of one of my algorithms, and I am not sure what complexity to consider for the memmove() function. Can you please help / explain ? void * memmove ( void * destination, const void * source, size_t num ); So is the complexity O(num) or O(1). I suppose it's O(num), but I am not sure as I lack for now the understanding of what's going on under the hood.

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  • Read whole ASCII file into C++ std::string

    - by Arrieta
    Hello, I need to read a whole file into memory and place it in a C++ std::string. If I were to read it into a char, the answer would be very simple: std::ifstream t; int lenght; t.open("file.txt", "r"); // open input file t.seekg(0, std::ios::end); // go to the end length = t.tellg(); // report location (this is the lenght) t.seekg(0, std::ios::beg); // go back to the beginning buffer = new char[length]; // allocate memory for a buffer of appropriate dimension t.read(buffer, length); // read the whole file into the buffer t.close(); // close file handle // ... do stuff with buffer here ... Now, I want to do the exact same thing, but using a std::string instead of a char. I want to avoid loops, i. e., I don't want to: std::ifstream t; t.open("file.txt", "r"); std::string buffer; std::string line; while(t){ std::getline(t, line); // ... append line to buffer and go on } t.close() any ideas?

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  • Does std::multiset guarantee insertion order?

    - by Naveen
    I have a std::multiset which stores elements of class A. I have provided my own implementation of operator< for this class. My question is if I insert two equivalent objects into this multiset is their order guaranteed? For example, first I insert a object a1 into the set and then I insert an equivalent object a2 into this set. Can I expect the a1 to come before a2 when I iterate through the set? If no, is there any way to achieve this using multiset?

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  • What is an appropriate way to programmatically exit an application?

    - by denchr
    I am evaluating user inputs as commands for my application. If the user presses Q, or q, and then hits enter, the application quits and execution terminates. Is there a proper context, or best practices on how to do that? I do not have any resources to release, or anything like that. Should I just use System.exit(0);? Is there a recommended way to do that? As my first approach I do something like this: while (true){ try{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); //Other logic goes here... if (br.readLine().equalsIgnoreCase("Q")){ System.exit(0); } } catch (IOException ioe) { System.out.println("IO error trying to read your selection"); } }

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  • Sun Fire X4270 M3 SAP Enhancement Package 4 for SAP ERP 6.0 (Unicode) Two-Tier Standard Sales and Distribution (SD) Benchmark

    - by Brian
    Oracle's Sun Fire X4270 M3 server achieved 8,320 SAP SD Benchmark users running SAP enhancement package 4 for SAP ERP 6.0 with unicode software using Oracle Database 11g and Oracle Solaris 10. The Sun Fire X4270 M3 server using Oracle Database 11g and Oracle Solaris 10 beat both IBM Flex System x240 and IBM System x3650 M4 server running DB2 9.7 and Windows Server 2008 R2 Enterprise Edition. The Sun Fire X4270 M3 server running Oracle Database 11g and Oracle Solaris 10 beat the HP ProLiant BL460c Gen8 server using SQL Server 2008 and Windows Server 2008 R2 Enterprise Edition by 6%. The Sun Fire X4270 M3 server using Oracle Database 11g and Oracle Solaris 10 beat Cisco UCS C240 M3 server running SQL Server 2008 and Windows Server 2008 R2 Datacenter Edition by 9%. The Sun Fire X4270 M3 server running Oracle Database 11g and Oracle Solaris 10 beat the Fujitsu PRIMERGY RX300 S7 server using SQL Server 2008 and Windows Server 2008 R2 Enterprise Edition by 10%. Performance Landscape SAP-SD 2-Tier Performance Table (in decreasing performance order). SAP ERP 6.0 Enhancement Pack 4 (Unicode) Results (benchmark version from January 2009 to April 2012) System OS Database Users SAPERP/ECCRelease SAPS SAPS/Proc Date Sun Fire X4270 M3 2xIntel Xeon E5-2690 @2.90GHz 128 GB Oracle Solaris 10 Oracle Database 11g 8,320 20096.0 EP4(Unicode) 45,570 22,785 10-Apr-12 IBM Flex System x240 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 EE DB2 9.7 7,960 20096.0 EP4(Unicode) 43,520 21,760 11-Apr-12 HP ProLiant BL460c Gen8 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 EE SQL Server 2008 7,865 20096.0 EP4(Unicode) 42,920 21,460 29-Mar-12 IBM System x3650 M4 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 EE DB2 9.7 7,855 20096.0 EP4(Unicode) 42,880 21,440 06-Mar-12 Cisco UCS C240 M3 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 DE SQL Server 2008 7,635 20096.0 EP4(Unicode) 41,800 20,900 06-Mar-12 Fujitsu PRIMERGY RX300 S7 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 EE SQL Server 2008 7,570 20096.0 EP4(Unicode) 41,320 20,660 06-Mar-12 Complete benchmark results may be found at the SAP benchmark website http://www.sap.com/benchmark. Configuration and Results Summary Hardware Configuration: Sun Fire X4270 M3 2 x 2.90 GHz Intel Xeon E5-2690 processors 128 GB memory Sun StorageTek 6540 with 4 * 16 * 300GB 15Krpm 4Gb FC-AL Software Configuration: Oracle Solaris 10 Oracle Database 11g SAP enhancement package 4 for SAP ERP 6.0 (Unicode) Certified Results (published by SAP): Number of benchmark users: 8,320 Average dialog response time: 0.95 seconds Throughput: Fully processed order line: 911,330 Dialog steps/hour: 2,734,000 SAPS: 45,570 SAP Certification: 2012014 Benchmark Description The SAP Standard Application SD (Sales and Distribution) Benchmark is a two-tier ERP business test that is indicative of full business workloads of complete order processing and invoice processing, and demonstrates the ability to run both the application and database software on a single system. The SAP Standard Application SD Benchmark represents the critical tasks performed in real-world ERP business environments. SAP is one of the premier world-wide ERP application providers, and maintains a suite of benchmark tests to demonstrate the performance of competitive systems on the various SAP products. See Also SAP Benchmark Website Sun Fire X4270 M3 Server oracle.com OTN Oracle Solaris oracle.com OTN Oracle Database 11g Release 2 Enterprise Edition oracle.com OTN Disclosure Statement Two-tier SAP Sales and Distribution (SD) standard SAP SD benchmark based on SAP enhancement package 4 for SAP ERP 6.0 (Unicode) application benchmark as of 04/11/12: Sun Fire X4270 M3 (2 processors, 16 cores, 32 threads) 8,320 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, Oracle 11g, Solaris 10, Cert# 2012014. IBM Flex System x240 (2 processors, 16 cores, 32 threads) 7,960 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, DB2 9.7, Windows Server 2008 R2 EE, Cert# 2012016. IBM System x3650 M4 (2 processors, 16 cores, 32 threads) 7,855 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, DB2 9.7, Windows Server 2008 R2 EE, Cert# 2012010. Cisco UCS C240 M3 (2 processors, 16 cores, 32 threads) 7,635 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, SQL Server 2008, Windows Server 2008 R2 DE, Cert# 2012011. Fujitsu PRIMERGY RX300 S7 (2 processors, 16 cores, 32 threads) 7,570 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, SQL Server 2008, Windows Server 2008 R2 EE, Cert# 2012008. HP ProLiant DL380p Gen8 (2 processors, 16 cores, 32 threads) 7,865 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, SQL Server 2008, Windows Server 2008 R2 EE, Cert# 2012012. SAP, R/3, reg TM of SAP AG in Germany and other countries. More info www.sap.com/benchmark

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  • Do I need to uninstall lxde before installing kde-standard?

    - by A Roy
    I have ubuntu 12.04 (upgraded from 10.04) and since I disliked the default desktop, I installed lxde (sudo apt-get install lxde). This was good except that occasionally there would be trouble with Firefox (blinking on panel) so that finally I had to close it and then a error message from Ubuntu was issued. I had asked about it before but there was no useful response so now I want to move to another desktop which will hopefully not create the problem I have now. My doubt is, should I first uninstall lxde and then install kde (sudo apt-get install kde-standard) or is it enough to install kde without uninstalling lxde? In case it is necessary to uninstall, should I use the command sudo apt-get remove lxde or is there a better command for it? You may also help me with choice of desktop. I installed lxde since this is simple and lightweight. I am assuming that kde will not be as simple but hopefully not create problem like above. But I hate if it takes too long to log in or to launch a program like Firefox etc and also there should not be icons fixed on the left part of terminal (I hate to keep icons on desktop since these are distracting). Some of these issues were present with default Ubuntu 12.04. So is my choice of kde-standard appropriate or are there better desktop alternatives?

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  • Can I use standard tools to get the full name of a process, when its name has embedded spaces?

    - by fred.bear
    I understand that it may be a rare situation for an executable to have spaces in it, but it could happen. An example may be the best explanation.. Using standard tools, I want to determine the location (on the file system) of the executable which owns(?) the current window... get the current window ID ...(xdotool getactivewindow ) use the ID to get the PID ...(wmctrl -p -l | sed ... ID .... use the PID to get the executable's name ... (ps -A ... here is where I run into problems ! Whith ps, when listing only the executable's name (-o ucmd), it truncates the name to 15 characters, so this rules out this option for any name which is longer. Widening the column (-o ucmd:99 ) makes no difference.. If pgrep is anything to go by, its matching is limited to 15 because of stat (see: info pgrep).. Listings in variants of "full" mode (eg -A w w) are not useful when the name concerned has spaces in it, because this name is separated from its args by another space!.. Also, in "full" mode, if the process was started by a link, the name of the link is shown, rather than the executable's name. Is there some way to do this (using standard tools)? ...or are spaces a show stopper here?

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  • Is there a standard way to track 2d tile positions both locally and on screen?

    - by Magicked
    I'm building a 2D engine based on 32x32 tiles with OpenGL. OpenGL draws from the top left, so Y coordinates go down the screen as they increase. Obviously this is different than a standard graph where Y coordinates move up as they increase. I'm having trouble determining how I want to track positions for both sprites and tile objects (objects that are collections of tiles). My brain wants to set the world position as the bottom left of the object and track every object this way. The problem with this is I would have to translate it to an on screen position on rendering. The positive with this is I could easily visualize (especially in the case of objects made of multiple tiles) how something is structured and needs to be built. Are there standard ways for doing this? Should I just suck it up and get used to positions beginning in the top left? Here are the OpenGL calls to start rendering: // enable textures since we're going to use these for our sprites glEnable(GL_TEXTURE_2D); glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // enable alpha blending glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // disable the OpenGL depth test since we're rendering 2D graphics glDisable(GL_DEPTH_TEST); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0, WIDTH, HEIGHT, 0, 1, -1); glMatrixMode(GL_MODELVIEW); I assume I need to change: glOrtho(0, WIDTH, HEIGHT, 0, 1, -1); to: glOrtho(0, WIDTH, 0, HEIGHT, 1, -1);

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  • Do you think we will ever settle on a "standard" platform? [closed]

    - by GazTheDestroyer
    The recent explosion of phone platforms has depressed me (slightly), and made me wonder if we will ever reach any kind of standard for presentation? I don't mean language or IDE. Different languages have different strengths and I can see that there may always be a need for disparity, although I do note that languages are merging somewhat in functionality, with traditional imperitive languages like C++ now supporting things like lambdas. What I'm really talking about is a common presentation mechanism. Before smart phones and tablets came along, the web seemed to be finally becoming a reasonable platform for presenting an application that was globally accessible, not just geographically, but by platform too. Sure there are still (sometimes infuriating) implementation differences and quirks, but if you wrote a decent site you knew it could be accessed on anything from a PC to a phone to a C64 running the right software. "Write Once Run Anywhere" seemed to finally be becoming a reality. However, in the last few years we've seen an explosion of mobile operating systems, and the ubiquitous "app". A good site is no longer enough, you need a native "app", and of course we have a sudden massive disparity in OS, language, and APIs needed to write them as each battles for supremecy. It's kind of weird how the cycle of popularity goes. Mainframes with terminals - thin client. PC - thick client. Web browser - thin client. Phone app - thick(ish) client. I just wonder if you think there will ever be a global standard for clients, or whether the "shiny and different" cycle will always continue along with the battle of the tech du jour.

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  • What is the standard way of using Q15 values?

    - by Alex
    To process 8-bit pixels, to do things like gamma correction without losing information, we normally upsample the values, work in 16 bits or whatever, and then downsample them to 8 bits. Now, this is a somewhat new area for me, so please excuse incorrect terminology etc. For my needs I have chosen to work in "non-standard" Q15, where I only use the upper half of the range (0.0-1.0), and 0x8000 represents 1.0 instead of -1.0. This makes it much easier to calculate things in C. But I ran into a problem with SSSE3. It has the PMULHRSW instruction which multiplies Q15 numbers, but it uses the "standard" range of Q15 is [-1,1-2?¹5], so multplying (my) 0x8000 (1.0) by 0x4000 (0.5) gives 0xC000 (-0.5), because it thinks 0x8000 is -1. This is quite annoying. What am I doing wrong? Should I keep my pixel values in the 0000-7FFF range? This kind of defeats the purpose of it being a fixed-point format. Is there a way around this? Maybe some trick? Is there some kind of definitive treatise on Q15 which discusses all this?

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  • What is the current "standard" for setting up a development environment that supports remote collaboration as well as secure version control?

    - by Andrew
    What is the current "standard" for setting up a development environment that supports remote collaboration as well as secure version control? Considering a virtual dedicated solution with vm for a web layer and a data layer, using VPN for each programmer. We're a small start-up that do both Microsoft and open-source development. Is there a set software tools or packages that are appropriate for a small shop and yet scalable? Thanks.

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  • Do you have Standard Operating Procedures in place for SQL?

    - by Jonathan Kehayias
    The last two weeks, I have been Active Duty for the Army completing the last phase of BNCOC (Basic Non-Commissioned Officers Course) for my MOS (Military Occupational Specialty).  While attending this course a number of things stood out to me that have practical application in the civilian sector as well as in the military.  One of these is the necessity and purpose behind Standard Operating Procedures, or as we refer to them SOPs.  In the Army we have official doctrines, often in...(read more)

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  • Opera 11.10 sort en version bêta : meilleur support du CSS3 et prise en charge du standard WOFF et du format ouvert WebP

    Opera 11.10 sort en version bêta Meilleur support du CSS3 et prise en charge du standard WOFF et du format ouvert WebP Opera Software vient de dévoiler la bêta de la version 11.10 de son navigateur, encore plus rapide, épurée et performante. Côté visuel, cette version (nom de code Barracuda) garde le même design général simplifié de la version 11. Seule la fonctionnalité Speed Dial (galerie des miniatures) a été relookée pour faciliter et accélérer l'accès aux sites favoris. Le nombre d'adresses que l'utilisateur peut désormais placer da...

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  • Are We Losing a Standard (Edition) Data Recovery Technology?

    - by AllenMWhite
    One of the coolest technologies Microsoft released with SQL Server 2005 was Database Mirroring, which provided the ability to have a failover copy of a database on another SQL Server instance, and have the ability to automatically failover to that copy should a problem occur with the primary database. What was even cooler was that this new technology was available on Standard Edition! Mom and Pop shops could afford to implement a high availability solution without paying an extra tens of thousands...(read more)

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  • How can I get a complete list of non-standard repositories in use?

    - by MagicFab
    While doing some support audits I'd like to know what would be the most efficient/compact way to get a list of all extra reporitories being used on a given Ubuntu workstation using command line (not via the GUI tools). So far I am using: diff'ing a standard sources.list file against the workstation's examining files under cat /etc/apt/sources.list.d Any other ideas on how to best go about this ?

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  • Le W3C publie la proposition du standard "Do Not Track", et pose les fondements de la protection anti-traçage publicitaire

    Le W3C publie la proposition du standard "Do Not Track" Et pose dans deux brouillons les fondements de la protection anti-traçage publicitaire Mise à jour du 15 novembre 2011 par Idelways Les premiers objectifs sont atteints par le groupe de travail « Tracking Protection » du W3C, dédié à la standardisation d'une solution de protection antitraçage publicitaire. Créé à l'initiative « Do Not Track » de Microsoft et Mozilla, le groupe du consortium mondial vient de publier deux brouillons de spécifications que les éditeurs de navigateurs et créateurs de sites devront implémenter à terme pour rendre l'utili...

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  • Le W3C valide le standard CSS Media Queries, pour l'affichage dynamique des pages Web en fonction des tailles d'écran

    Le W3C valide le standard CSS Media Queries permettant d'adapter dynamiquement des pages Web en fonction des tailles d'écran Avec la prolifération des terminaux de différentes tailles d'écran (tablettes, téléphones mobiles, etc.), les développeurs Web faisaient face à un problème d'adaptation de l'affichage de leur site en fonction de la taille de l'écran du dispositif d'exécution. Les CSS Medias Queries introduits par CSS 3, ont permis de résoudre ce problème en définissant des techniques pour l'application de feuilles de styles en fonction des périphériques de consultation utilisés. Cette fonctionnalité offre aux développeurs des moyens permettant de définir des règles d'afficha...

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  • Should I set up standard email accounts? What are they?

    - by artlung
    A long time ago one used to be able to count on domains having addresses like [email protected], [email protected], or [email protected] ... is this convention dead? Note: I always try to make sure to make a contact available on the websites I put up, so people can contact us if necessary. But are there reasons to handle these or other "standard" email addresses I might not be thinking of? I set up less email addresses than I used to since spam got so awful, and a "predictable" email address just seems to be an invitation to the lousy spammers.

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  • How do I pipe terminal standard output (stdout) to the clipboard?

    - by Insperatus
    For example, Say I want to list the contents of a folder and directly paste them into a chat window for a friend to see. I realize I could do ls > filename.txt to create a file (filename.txt) with those contents; I'd then have to open or print the file and manually select and copy the text block (which can be annoying/tedious.) I clearly could also select and copy the output of ls directly from within the terminal window. It would be much faster/easier to simply pipe standard output to the clipboard. What terminal command allows me to do this?

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  • Should I use non-standard tags in a HTML page for highlighting words?

    - by rcs20
    I would like to know if it's a good practice or legal to use non-standard tags in an HTML page for certain custom purposes. For example: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam consequat, felis sit amet suscipit laoreet, nisi arcu accumsan arcu, vel pulvinar odio magna suscipit mi. I want to highlight "consectetur adipiscing elit" as important and "nisi arcu accumsan arcu" as highlighted. So in the HTML I would put: Lorem ipsum dolor sit amet, <important>consectetur adipiscing elit</important>. Nullam consequat, felis sit amet suscipit laoreet, <highlighted>nisi arcu accumsan arcu</highlighted>, vel pulvinar odio magna suscipit mi. and in the CSS: important { background: red color: white; } highlighted { background: yellow; color: black; } However, since these are not valid HTML tags, is this ok?

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  • How to make Eclipse CDT's Linux GCC toolchain resolve C++ standard library headers?

    - by Muhammad Khan
    In Ubuntu 12.04 LTS I installed the Eclipse CDT plugin and opened the new hello world project to just test everything out. When I was creating the project, I chose the only toolchain: "Linux GCC" When the project is created, however, it says that #include<iostream> #include<cstdlb> are unresolved. Thus, lines with cout and endl can't be used and it cannot find std. using namespace std; is also causing problems. How can I get my #include directives for standard library headers recognized, to support code using the std namespace?

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