Search Results

Search found 21559 results on 863 pages for 'template meta programming'.

Page 376/863 | < Previous Page | 372 373 374 375 376 377 378 379 380 381 382 383  | Next Page >

  • How to persuade C fanatics to work on my C++ open source project?

    - by paperjam
    I am launching an open-source project into a space where a lot of the development is still done Linux-kernel-style, i.e. C-language with a low-level mindset. There are multiple benefits to C++ in our space but I fear those used to working in C will be scared off. How can I make the case for the benefits of C++? Specifically, the following C++ attributes are very valuable: concept of objects and reference-counting pointers - really don't want to have to malloc(sizeof(X)) or memcpy() structs templates for specialising whole bodies of code with specific performance optimizations and for avoiding duplication of code. template metaprogramming related to the above syntactic sweetness available (e.g. operator overloading, to be used in very small doses) STL Boost libraries Many of the knee-jerk negative reactions to C++ are illfounded. Performance does not suffer: modern compilers can flatten dozens of call stack levels and avoid bloat through wide use of template specializations. Granted, when using metaprogramming and building multiple specializations of a large call tree, compile time is slower but there are ways to mitigate this. How can I sell C++?

    Read the article

  • Discrete Math and Computing Course

    - by ShrimpCrackers
    I was recently admitted into a Computing and Software Systems program (basically software engineering) and one of the first courses I'll be taking is called Mathematical Principles of Computing. The course description: "Integrating mathematical principles with detailed instruction in computer programming. Explores mathematical reasoning and discrete structures through object-oriented programming. Includes algorithm analysis, basic abstract data types, and data structures." I'm not a fan of math, but I've been doing well in all my math classes mostly A's and B's ever since I started two years ago, and I've been doing math every quarter - never took a quarter without math - so I've been doing it all in sequence without gaps. However, I'm worried about this class. I've read briefly on what discrete math is and from what my advisor told me, its connection with computer science is that it has alot to do with proving algorithms. One thing that my instructors briefly touched on and never went into detail was proving algorithms, and when I tried, I just wasn't very good at mathematical induction. It's one of the things that I ignored every time it showed up in a homework problem (usually in Calculus III which I'm finishing up right now). Questions: 1. What can I expect from this class? 2. How can I prepare myself for this class? 3. Other tips? Thank you.

    Read the article

  • My proposed design is usually worse than my colleague's - how do I get better?

    - by user151193
    I have been programming for couple of years and am generally good when it comes to fixing problems and creating small-to-medium scripts, however, I'm generally not good at designing large scale programs in object oriented way. Few questions Recently, a colleague who has same number of years of experience as me and I were working on a problem. I was working on a problem longer than him, however, he came up with a better solution and in the end we're going to use his design. This really affected me. I admit his design is better, but I wanted to come up with a design as good as his. I'm even contemplating quitting the job. Not sure why but suddenly I feel under some pressure e.g. what would juniors think of me and etc? Is it normal? Or I'm thinking a little too much into this? My job involves programming in Python. I try to read source code but how do you think I can improve me design skills? Are there any good books or software that I should study? Please enlighten me. I will really appreciate your help.

    Read the article

  • Creating dynamic plots

    - by geoff92
    I'm completely new to web programming but I do have a programming background. I'd like to create a site that allows users to visit, enter some specifications into a form, submit the form, and then receive a graph. I have a few questions about this, only because I'm pretty ignorant: Is there a good framework I should start in? I know a lot of java, I'm okay with python, and I learned Ruby in the past. I figure I might use ruby on rails only because I hear of it so often and I think I've also heard it's easy. If anyone has some other recommendation, please suggest. The user will be entering data into a form. I'm guessing the request they'll be making should be one of a GET request, right? Because I don't intend for any of the data they're entering to modify my server (in fact, I don't intend on having a database). The data the user inputs will be used to perform calculations involving lots of matrices. I've written this functionality in python. If I use ruby on rails, should it be instead written in Ruby? Somewhere I've heard that you can either place the load of the work on your server or on the client's computer. Since the code performs heavy math, which option is preferable? How do I alter the setup to either make the client do the work or my server? Should I be using a "cgi-bin"? In the code that I have now, I use matplotlib, a python library, and then "show" the plot in order to see the graph. I specify the x and y limits, but I am able to "drag" the graph in order to see more data within the plot window. Ultimately, I want a graph to be shown on my site with the drag functionality. Is this possible? What if the client drags the graph so far, more computations must be made? Thanks!

    Read the article

  • How can I port msvc++ code with non-dependent names in templates to Linux?

    - by user352382
    I can deal with porting platform dependent functions. I have a problem that the compilers I tried on Linux (clang and g++) do not accept the following code, while the msvc++ compiler does: template <class T> class Base { protected: T Value; }; template <class T> class Derived : public Base<T> { public: void setValue(const T& inValue){ Value = inValue; } }; int main(int argc, char const *argv[]) { Derived<int> tmp; tmp.setValue(0); return 0; } g++ error: main.cpp: In member function ‘void Derived<T>::setValue(const T&)’: main.cpp:11:3: error: ‘Value’ was not declared in this scope I believe this due to the use of a non-dependent name (Value) in the second class. More information. The problem is that I have a very large code base, in which this type of code is used very often. I understand that it is wrong when looking at the standard. However it is very convenient not having to write this-> or Base<T>:: in front of every use of Value. Even writing using Base<T>::Value; at the start of the derived class is problematic when you use ~20 members of the base class. So my question is: are there compilers for Linux that allow this kind of code (with or without extra compiler switches)? Or are there small modifications that will allow this code to compile on Linux?

    Read the article

  • How to learn to program [on hold]

    - by user94914
    I went to a community college and got a degree in computer science, but I found out I only learn very little about programming. As a result I landed byself a office assistant work (for a year now), I want to study on my own and apply for some internship / very entry level development job. I am wondering how should a person learn to program now? I feel that I might not doing it correctly, I understand everyone has a different approach, but I am really clueless on what to do, as it seems I am 5-10 years away. 1) Read the old college programming textbook cover to cover, learn every single concepts, do all the practice problems and master them (1-2 times until error free). Currently reading this java book 2) Work on any project, keep on googling and reading tutorials (including the books on that specific language). I have been doing 1, but the progress is really slow, about 2-5 pages / hour, over a 1000+ page book, I felt really discouraged. I have a few of them to go through (data struction, analyis algorthim, computer theory, operating system.) I wonder is this the right method to do? I know it is going to take time, but I am hoping to get some advice from current programmers.

    Read the article

  • How should a non-IT manager secure the long-term maintenance and development of essential legacy software?

    - by user105977
    I've been hunting for a place to ask this question for quite a while; maybe this is the place, although I'm afraid it's not the kind of "question with an answer" this site would prefer. We are a small, very specialized, benefits administration firm with an extremely useful, robust collection of software, some written in COBOL but most in BASIC. Two full-time consultants have ably maintained and improved this system over more than 30 years. Needless to say they will soon retire. (One of them has been desperate to retire for several years but is loyal to a fault and so hangs on despite her husband's insistence that golf should take priority.) We started down the path of converting to a system developed by one of only three firms in the country that offer the type of software we use. We now feel that although this this firm is theoretically capable of completing the conversion process, they don't have the resources to do so timely, and we have come to believe that they will be unable to offer the kind of service we need to run our business. (There's nothing like being able to set one's own priorities and having the authority to allocate one's resources as one sees fit.) Hardware is not a problem--we are able to emulate very effectively on modern servers. If COBOL and BASIC were modern languages, we'd be willing to take the risk that we could find replacements for our current consultants going forward. It seems like there ought to be a business model for an IT support firm that concentrates on legacy platforms like this and provides the programming and software development talent to support a system like ours, removing from our backs the risks of finding the right programming talent and the job of convincing younger programmers that they can have a productive, rewarding career, in part in an old, non-sexy language like BASIC. Where do I find such firms?

    Read the article

  • What is the fastest way for me to become a full stack developer? [on hold]

    - by user136368
    I run a small webdesign firm. I have an overview of HTML, CSS, JS, PHP(laravel), MySQL. I did a few courses on code academy. I wanted to build a web app in the company. I find that I am severely crippled by the lack of programming expertise. I want to become a full stack developer who can build a prototype on his own. I cannot spend 5-10k USD on the boot camp courses. Can someone suggest structured courses which can help me become a full stack developers? I found the following websites but I donot know if they can help me become one. My goal: Be able to make a working prototype of the ideas I come up with.(This is my primary goal. I do not want to be the lead developer. I just want to be able to make a prototype.) Several questions I have in mind: Will it be fine if I stick to PHP(laravel)? Should I be using ROR? I have come across a few online resources: Codeacademy, codeschool,teamtreehouse,and theodinproject. These are within my affordability range. I can commit to a 2-3 months intensively to learn programming. What do you suggest I do?

    Read the article

  • RedirectToAction help: or better suggestion

    - by Dean Lunz
    Still getting my feet wet with asp.net mvc. I have a working Action and httppost action but I want to replace the "iffy" code with a RedirectToAction call because the code is rather large for what it does. A call using RedirectToAction would clean it up more. Every way I've tried it fails to work for me in that the drop down list fails to have the proper item selected. The code below works fine but calling RedirectToAction the was I have been does not work for me. So how can i rework the code below to use RedirectToAction ? I find this line of code particularly troubling because there is no garentee that the "this.Url.RequestContext.RouteData.Route" property will be of type "System.Web.Routing.Route". // get url request var urlValue = "/" + ((System.Web.Routing.Route)(this.Url.RequestContext.RouteData.Route)).Url; I also find the second piece of code rather bloated ... // build the url template urlValue = urlValue.Replace("{realm}", realm); urlValue = urlValue.Replace("{guild}", guild); urlValue = urlValue.Replace("{date}", date.ToShortDateString().Replace("/", "-")); urlValue = urlValue.Replace("{pageIndex}", pageIndex.ToString()); urlValue = urlValue.Replace("{itemCount}", itemCountToDisplay.ToString()); The route I have setup is routes.MapRoute( "GuildOverview Realm", // Route name "GuildMembers/{realm}/{guild}/{date}/{pageIndex}/{itemCount}", // URL with parameters new { controller = "GuildMembers", action = "Index" }); // Parameter defaults The code for my controller actions is below ... [HttpPost] public ActionResult Index(string realm, string guild, DateTime date, int pageIndex, int itemCount, FormCollection formCollection) { // get form data if it's there and try parse num items to display var cnt = this.Request.Form["ddlDisplayCount"]; int itemCountToDisplay = 10; if (!string.IsNullOrEmpty(cnt)) int.TryParse(cnt, out itemCountToDisplay); // get url request var urlValue = "/" + ((System.Web.Routing.Route)(this.Url.RequestContext.RouteData.Route)).Url; // build the url template urlValue = urlValue.Replace("{realm}", realm); urlValue = urlValue.Replace("{guild}", guild); urlValue = urlValue.Replace("{date}", date.ToShortDateString().Replace("/", "-")); urlValue = urlValue.Replace("{pageIndex}", pageIndex.ToString()); urlValue = urlValue.Replace("{itemCount}", itemCountToDisplay.ToString()); return this.Redirect(urlValue); } public ActionResult Index(string realm, string guild, DateTime date, int pageIndex, int itemCount) { // get the page index ViewData["pageIndex"] = pageIndex; // validate item count var pageItemCountItems = new[] { 10, 20, 50, 100 }; if (!pageItemCountItems.Contains(itemCount)) itemCount = pageItemCountItems[0]; // calc the number of pages there are var numPages = (this._repository.GetGuildMemberCount(date, realm, guild) / itemCount) + 1; this.ViewData["pageCount"] = numPages; // get url request var urlValue = "/" + ((System.Web.Routing.Route)(this.Url.RequestContext.RouteData.Route)).Url; // build the url template urlValue = urlValue.Replace("{realm}", realm); urlValue = urlValue.Replace("{guild}", guild); urlValue = urlValue.Replace("{date}", date.ToShortDateString().Replace("/", "-")); urlValue = urlValue.Replace("{pageIndex}", "{0}"); urlValue = urlValue.Replace("{itemCount}", itemCount.ToString()); // set url template ViewData["UrlTemplate"] = urlValue; // set list of items for the display count dropdown var itemCounts = new SelectList(pageItemCountItems, itemCount); ViewData["DisplayCount"] = itemCounts; return View(_repository.GetGuildCharacters(date, realm, guild, (pageIndex - 1) * itemCount, itemCount)); } and my Index view contains the fallowing <%=Html.SimplePager(int.Parse(ViewData["pageIndex"].ToString()), int.Parse(ViewData["pageCount"].ToString()), ViewData["urlTemplate"].ToString(), "nav-menu")%> <% using (Html.BeginForm()) { %> <%= Html.DropDownList("ddlDisplayCount", (SelectList)ViewData["DisplayCount"], new { onchange = "this.form.submit();" })%> <% }%>

    Read the article

  • Using xsl:variable in a xsl:foreach select statment

    - by Nefariousity
    I'm trying to iterate through an xml document using xsl:foreach but I need the select=" " to be dynamic so I'm using a variable as the source. Here's what I've tried: ... <xsl:template name="SetDataPath"> <xsl:param name="Type" /> <xsl:variable name="Path_1">/Rating/Path1/*</xsl:variable> <xsl:variable name="Path_2">/Rating/Path2/*</xsl:variable> <xsl:if test="$Type='1'"> <xsl:value-of select="$Path_1"/> </xsl:if> <xsl:if test="$Type='2'"> <xsl:value-of select="$Path_2"/> </xsl:if> <xsl:template> ... <!-- Set Data Path according to Type --> <xsl:variable name="DataPath"> <xsl:call-template name="SetDataPath"> <xsl:with-param name="Type" select="/Rating/Type" /> </xsl:call-template> </xsl:variable> ... <xsl:for-each select="$DataPath"> ... The foreach threw an error stating: "XslTransformException - To use a result tree fragment in a path expression, first convert it to a node-set using the msxsl:node-set() function." When I use the msxsl:node-set() function though, my results are blank. I'm aware that I'm setting $DataPath to a string, but shouldn't the node-set() function be creating a node set from it? Am I missing something? When I don't use a variable: <xsl:for-each select="/Rating/Path1/*"> I get the proper results. Here's the XML data file I'm using: <Rating> <Type>1</Type> <Path1> <sarah> <dob>1-3-86</dob> <user>Sarah</user> </sarah> <joe> <dob>11-12-85</dob> <user>Joe</user> </joe> </Path1> <Path2> <jeff> <dob>11-3-84</dob> <user>Jeff</user> </jeff> <shawn> <dob>3-5-81</dob> <user>Shawn</user> </shawn> </Path2> </Rating> My question is simple, how do you run a foreach on 2 different paths?

    Read the article

  • Silverlight ItemsControl vertical scrollbar, using a wrappanel as ControlTemplate

    - by Orestes C.A.
    I have a collection of elements, each one with a name and a subcollection of image blobs. I want to display an Accordion, with each item representing each of the MainElements. inside each element, I display the images in the subcollecion of said MainElement. The Accordion gets resized by the user, so I use a wrappanel for presenting the images. When the accordion is wide enough, the images reorder themselves fitting as many as posible in each row. the problem comes when the wrappanel only displays one image per row (because there's no space enough for more), the image list continues, but I can't see all the images, because they don't fit inside the control's height. I need a vertical scrollbar to be displayed inside the AccordionItem so I can scroll down the image list. So, here's my code: <layoutToolkit:Accordion Width="Auto" Height="Auto" ItemsSource="{Binding MainElementCollection}"> <layoutToolkit:Accordion.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding MainElementName}" /> </DataTemplate> </layoutToolkit:Accordion.ItemTemplate> <layoutToolkit:Accordion.ContentTemplate> <DataTemplate> <ItemsControl ItemsSource="{Binding SubElementCollection}" ScrollViewer.VerticalScrollBarVisibility="Auto" > <ItemsControl.Template> <ControlTemplate> <controlsToolkit:WrapPanel /> </ControlTemplate> </ItemsControl.Template> <ItemsControl.ItemTemplate> <DataTemplate> <Grid> <Image Margin="2" Width="150" Source="{Binding PreviewImage, Converter={StaticResource ImageConverter}}" /> </Grid> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> </DataTemplate> </layoutToolkit:Accordion.ContentTemplate> </layoutToolkit:Accordion> http://www.silverlightshow.net/tips/How-to-add-scrollbars-to-ItemsControl.aspx suggests that I should surround my wrappanel with a scrollviewer, like this <ItemsControl.Template> <ControlTemplate> <scrollviewer> <controlsToolkit:WrapPanel /> </scrollviewer> </ControlTemplate> </ItemsControl.Template> But then my wrappanel gets really small and I can only see a small vertical scrollbar Any ideas? Thanks a lot. Edit: I figured thatthe wrappanel loses its width when used in the controltemplate It should be used as follows: <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <controlsToolkit:WrapPanel ScrollViewer.VerticalScrollBarVisibility="Visible" /> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> Anyway, I tried adding the ScrollViewer.VerticalScrollBarVisibility="Visible" line but I'm stuck again.

    Read the article

  • Why isn't the Spring AOP XML schema properly loaded when Tomcat loads & reads beans.xml

    - by chrisbunney
    I'm trying to use Spring's Schema Based AOP Support in Eclipse and am getting errors when trying to load the configuration in Tomcat. There are no errors in Eclipse and auto-complete works correctly for the aop namespace, however when I try to load the project into eclipse I get this error: 09:17:59,515 WARN XmlBeanDefinitionReader:47 - Ignored XML validation warning org.xml.sax.SAXParseException: schema_reference.4: Failed to read schema document 'http://www.springframework.org/schema/aop/spring-aop-2.5.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not . Followed by: SEVERE: StandardWrapper.Throwable org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 39 in XML document from /WEB-INF/beans.xml is invalid; nested exception is org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'aop:config'. Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'aop:config'. Based on this, it seems the schema is not being read when Tomcat parses the beans.xml file, leading to the <aop:config> element not being recognised. My beans.xml file is as follows: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jaxws="http://cxf.apache.org/jaxws" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <!--import resource="classpath:META-INF/cxf/cxf.xml" /--> <!--import resource="classpath:META-INF/cxf/cxf-extension-soap.xml" /--> <!--import resource="classpath:META-INF/cxf/cxf-servlet.xml" /--> <!-- NOTE: endpointName attribute maps to wsdl:port@name & should be the same as the portName attribute in the @WebService annotation on the IWebServiceImpl class --> <!-- NOTE: serviceName attribute maps to wsdl:service@name & should be the same as the serviceName attribute in the @WebService annotation on the ASDIWebServiceImpl class --> <!-- NOTE: address attribute is the actual URL of the web service (relative to web app location) --> <jaxws:endpoint xmlns:tns="http://iwebservices.ourdomain/" id="iwebservices" implementor="ourdomain.iwebservices.IWebServiceImpl" endpointName="tns:IWebServiceImplPort" serviceName="tns:IWebService" address="/I" wsdlLocation="wsdl/I.wsdl"> <!-- To have CXF auto-generate WSDL on the fly, comment out the above wsdl attribute --> <jaxws:features> <bean class="org.apache.cxf.feature.LoggingFeature" /> </jaxws:features> </jaxws:endpoint> <aop:config> <aop:aspect id="myAspect" ref="aBean"> </aop:aspect> </aop:config> </beans> The <aop:config> element in my beans.xml file is copy-pasted from the Spring website to try and remove any possible source of error Can anyone shed any light on why this error is occurring and what I can do to fix it?

    Read the article

  • C++ invalid reference problem

    - by Karol
    Hi all, I'm writing some callback implementation in C++. I have an abstract callback class, let's say: /** Abstract callback class. */ class callback { public: /** Executes the callback. */ void call() { do_call(); }; protected: /** Callback call implementation specific to derived callback. */ virtual void do_call() = 0; }; Each callback I create (accepting single-argument functions, double-argument functions...) is created as a mixin using one of the following: /** Makes the callback a single-argument callback. */ template <typename T> class singleArgumentCallback { protected: /** Callback argument. */ T arg; public: /** Constructor. */ singleArgumentCallback(T arg): arg(arg) { } }; /** Makes the callback a double-argument callback. */ template <typename T, typename V> class doubleArgumentCallback { protected: /** Callback argument 1. */ T arg1; /** Callback argument 2. */ V arg2; public: /** Constructor. */ doubleArgumentCallback(T arg1, V arg2): arg1(arg1), arg2(arg2) { } }; For example, a single-arg function callback would look like this: /** Single-arg callbacks. */ template <typename T> class singleArgFunctionCallback: public callback, protected singleArgumentCallback<T> { /** Callback. */ void (*callbackMethod)(T arg); public: /** Constructor. */ singleArgFunctionCallback(void (*callback)(T), T argument): singleArgumentCallback<T>(argument), callbackMethod(callback) { } protected: void do_call() { this->callbackMethod(this->arg); } }; For user convenience, I'd like to have a method that creates a callback without having the user think about details, so that one can call (this interface is not subject to change, unfortunately): void test3(float x) { std::cout << x << std::endl; } void test5(const std::string& s) { std::cout << s << std::endl; } make_callback(&test3, 12.0f)->call(); make_callback(&test5, "oh hai!")->call(); My current implementation of make_callback(...) is as follows: /** Creates a callback object. */ template <typename T, typename U> callback* make_callback( void (*callbackMethod)(T), U argument) { return new singleArgFunctionCallback<T>(callbackMethod, argument); } Unfortunately, when I call make_callback(&test5, "oh hai!")->call(); I get an empty string on the standard output. I believe the problem is that the reference gets out of scope after callback initialization. I tried using pointers and references, but it's impossible to have a pointer/reference to reference, so I failed. The only solution I had was to forbid substituting reference type as T (for example, T cannot be std::string&) but that's a sad solution since I have to create another singleArgCallbackAcceptingReference class accepting a function pointer with following signature: void (*callbackMethod)(T& arg); thus, my code gets duplicated 2^n times, where n is the number of arguments of a callback function. Does anybody know any workaround or has any idea how to fix it? Thanks in advance!

    Read the article

  • I'm trying to run some PHP scripts as CLI instead of over HTTP. How do I make them play nice?

    - by gnfti
    Hi everyone. I'm using some PHP scripts from FeedForAll to join together RSS feeds (RSSmesh) and display them as HTML (RSS2HTML). Because I intend to run these scripts fairly intensively and don't want the resulting HTTP requests and bandwidth to count towards my hosting quota, I am in the process of moving to running them on the web host's server in an umbrella PHP "batch" script, and call this script via cron (this is a Linux server, by the way). Here's a (working) sample request over HTTP: http://www.mydomain.com/a/rss2htmlcore/rss2html2.php?XMLFILE=http://www.mydomain.com/a/myapp/xmlcache/feed.xml&TEMPLATE=template.html This will produce the desired HTML output. An example of how I want this to work on the command line: /srv/customers/mycustomer#/mydomain.com/www/a/rss2htmlcore/rss2html2-cli.php /srv/customers/mycustomer#/mydomain.com/www/a/myapp/xmlcache/feed.xml /srv/customers/mycustomer#/mydomain.com/www/a/template.html This is with the correct shebang line added to "rss2html2-cli.php". I could just as well specify the executable ("/usr/local/bin/php") in the request, I doubt it makes a difference because I am able to run another script (that I wrote myself) either way without problems. Now, RSS2HTML and RSSmesh are different in that, for starters, they include secondary files -- for example, both include an XML parser script -- and I suspect that this is where I am getting a bit in over my head. Right now I'm calling exec() from the "umbrella" batch script, like so: exec("/srv/customers/mycustomer#/mydomain.com/www/a/rss2htmlcore/rss2html2-cli.php /srv/customers/mycustomer#/mydomain.com/www/a/myapp/xmlcache/feed.xml /srv/customers/mycustomer#/mydomain.com/www/a/template.html", $output) But no output is being produced. What's the best way to go about this and what "gotchas" should I keep in mind? Is exec() the right way to approach this? It works fine for the other (simple) script but that writes its own output. For this I want to get the output and write it to a file from within the umbrella script if possible. I've also tried output buffering but to no avail. Do I need to pay attention to anything specific with regard to the includes? Right now they're specified in the scripts as include_once("FeedForAll_XMLParser.inc.php"); and the specified files are indeed in the same folder. Further info: -This is a Linux server. -I have no direct access to the shell, so I can't test things directly on a command line, everything is via crontab. -I will admit that support for the FeedForAll scripts leaves a lot to be desired, but I'd like to keep using their scripts if at all possible, if only because I know them and have been using them for a while. I have looked into Simplepie, but the FFA scripts do some things that I've seen no obvious solutions for with Simplepie, like limiting the number of items per individual feed (RSSmesh) or limiting the description length (RSS2HTML). -Yahoo! Pipes is out, they cache their data for too long for my application. Should you want to take a look at the code, here are the scripts as txt files. RSS2HTML2 and RSSmesh are the FeedForAll scripts, FeedForAll_XMLParser... is the included parser. Note that I have not yet amended these to handle $argv etc. I have however in "scraper-universal-rss-cli", which works fine with CLI. If anyone has any thoughts to share on this it would be very much appreciated. Thank you in advance.

    Read the article

  • Psychology researcher wants to learn new language

    - by user273347
    I'm currently considering R, matlab, or python, but I'm open to other options. Could you help me pick the best language for my needs? Here are the criteria I have in mind (not in order): Simple to learn. I don't really have a lot of free time, so I'm looking for something that isn't extremely complicated and/or difficult to pick up. I know some C, FWIW. Good for statistics/psychometrics. I do a ton of statistics and psychometrics analysis. A lot of it is basic stuff that I can do with SPSS, but I'd like to play around with the more advanced stuff too (bootstrapping, genetic programming, data mining, neural nets, modeling, etc). I'm looking for a language/environment that can help me run my simpler analyses faster and give me more options than a canned stat package like SPSS. If it can even make tables for me, then it'll be perfect. I also do a fair bit of experimental psychology. I use a canned experiment "programming" software (SuperLab) to make most of my experiments, but I want to be able to program executable programs that I can run on any computer and that can compile the data from the experiments in a spreadsheet. I know python has psychopy and pyepl and matlab has psychtoolbox, but I don't know which one is best. If R had something like this, I'd probably be sold on R already. I'm looking for something regularly used in academe and industry. Everybody else here (including myself, so far) uses canned stat and experiment programming software. One of the reasons I'm trying to learn a programming language is so that I can keep up when I move to another lab. Looking forward to your comments and suggestions. Thank you all for your kind and informative replies. I appreciate it. It's still a tough choice because of so many strong arguments for each language. Python - Thinking about it, I've forgotten so much about C already (I don't even remember what to do with an array) that it might be better for me to start from scratch with a simple program that does what it's supposed to do. It looks like it can do most of the things I'll need it to do, though not as cleanly as R and MATLAB. R - I'm really liking what I'm reading about R. The packages are perfect for my statistical work now. Given the purpose of R, I don't think it's suited to building psychological experiments though. To clarify, what I mean is making a program that presents visual and auditory stimuli to my specifications (hundreds of them in a preset and/or randomized sequence) and records the response data gathered from participants. MATLAB - It's awesome that cognitive and neuro folk are recommending MATLAB, because I'm preparing for the big leap from social and personality psychology to cognitive neuro. The problem is the Uni where I work doesn't have MATLAB licenses (and 3750 GBP for a compiler license is not an option for me haha). Octave looks like a good alternative. PsychToolbox is compatible with Octave, thankfully. SQL - Thanks for the tip. I'll explore that option, too. Python will be the least backbreaking and most useful in the short term. R is well suited to my current work. MATLAB is well suited to my prospective work. It's a tough call, but I think I am now equipped to make a more well-informed decision about where to go next. Thanks again!

    Read the article

  • Rendering form on the fly from XML in flex

    - by kartikkowligi
    Hi, I have an xml code something like this <root> <render> <head> <transition id="fadeIn" type="fade" subtype="" dur="3s"/> <transition id="fadeOut" type="fade" subtype="" dur="3s"/> <layout> <root-layout width="480px" height="360px" backgroundColor="0"/> <region id="rootRegion" dur="15s"> <region id="background" soundLevel="100%" top="0px" left="0px" width="480px" height="360px" z-index="0"/> <region id="foreground" soundLevel="100%" top="0%" left="0%" width="480px" height="360px" z-index="1"/> </region> </layout> </head> <body> <par region="background" begin="0s"> <img> <meta name="assetsource" content="stock"/> <src>http://s3.amazonaws.com/JivoxStockImage/000003296736.jpg</src> <width>102.49999999999999%</width> <height>97.5%</height> <left>0%</left> <top>0%</top> <clipBegin/> <clipEnd/> <begin>0s</begin> <dur>15</dur> </img> <audio> <meta name="assetsource" content="stock"/> <src>http://audio.mp3</src> <clipBegin/> <clipEnd/> <begin>0s</begin> <dur>15s</dur> </audio> </par> <par region="foreground" begin="0s"> <img> <meta name="assettype" content="user"/> <src>http://image.png</src> <width>20%</width> <height>20%</height> <left>41.5%</left> <top>25.555555555555557%</top> <begin>2s</begin> <dur>10s</dur> <id>BA6B7CF0BD9080CAD7A02199483224EA61A6E08A</id> </img> </par> </body> </render> <form> <map formId="BA6B7CF0BD9080CAD7A02199483224EA61A6E08A" type="image" label="Logo" /> <map formId="F635A9123082A15834389030382683C55EB29E75" type="text" label="Company Name" /> </form> </root> Here I need to match formId in 'form' with that of 'id' in 'render' and create the form dynamically in flex. I am able to get the xml file via the httpservice. All I need to know is how to match it and render the form dynamically!!

    Read the article

  • XSLT: look for a word and it's context

    - by farhad
    Hello! I need to search a word and it's context into an xml. For example <line>hello world, my name is farhad and i'm having trouble with xslt</line> looking for 'and', context of 3 words: <line>hello world, my <span class="context">name is farhad <span class="word">and</span> i'm having</span> trouble with xslt</line> How can i do? I wrote some xslt to find the word, but i can't go back 3 words to set span. This is my xslt: <xsl:variable name="delimiters">[,.;!?\s"()]+</xsl:variable> <xsl:template match="/"> <xsl:apply-templates select="//line"/> </xsl:template> <xsl:template match="line"> <line> <xsl:for-each select="tokenize(.,'\s')"> <xsl:choose> <!-- se l'ultimo carattere è di punteggiatura, prendo la sottostringa senza la punteggiatura --> <xsl:when test="compare(replace(.,$delimiters,'$1'),'red') = 0"> <span class="word"> <xsl:value-of select="."/> </span> </xsl:when> <xsl:otherwise> <xsl:value-of select="."/> <xsl:choose> <xsl:when test="position()=last()"> <xsl:text></xsl:text> </xsl:when> <xsl:otherwise> <xsl:text> </xsl:text> </xsl:otherwise> </xsl:choose> </xsl:otherwise> </xsl:choose> </xsl:for-each> </line><xsl:text> </xsl:text> </xsl:template> This is an example xml: http://pastebin.com/eAVM9CDQ . I have to search for context also on preceding tags, for example: <line>hello world,</line> <line>my name</line> <line>is farhad </line> <line>and i'm having</line> <line>trouble with xslt</line> so, looking for 'and', context of 3 words: <line>hello world,</line> <line>my <span class="context">name</line> <line>is farhad </line> <line><span class="word">and</span> i'm having</span></line> <line>trouble with xslt</line> with problems of overlapping, but now it's not a problem (i think i know how manage it). How can i search a word and its context? Thank you very much.

    Read the article

  • STL operator= behavior change with Visual Studio 2010?

    - by augnob
    Hi, I am attempting to compile QtScriptGenerator (gitorious) with Visual Studio 2010 (C++) and have run into a compile error. In searching for a solution, I have seen occasional references to compile breakages introduced since VS2008 due to changes in VS2010's implementation of STL and/or c++0x conformance changes. Any ideas what is happening below, or how I could go about fixing it? If the offending code appeared to be QtScriptGenerator's, I think I would have an easier time fixing it.. but it appears to me that the offending code may be in VS2010's STL implementation and I may be required to create a workaround? PS. I am pretty unfamiliar with templates and STL. I have a background in embedded and console projects where such things have until recently often been avoided to reduce memory consumption and cross-compiler risks. C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xutility(275) : error C2679: binary '=' : no operator found which takes a right-hand operand of type 'rpp::pp_output_iterator<_Container>' (or there is no acceptable conversion) with [ _Container=std::string ] c:\qt\qtscriptgenerator\generator\parser\rpp\pp-iterator.h(75): could be 'rpp::pp_output_iterator<_Container> &rpp::pp_output_iterator<_Container>::operator =(const char &)' with [ _Container=std::string ] while trying to match the argument list '(rpp::pp_output_iterator<_Container>, rpp::pp_output_iterator<_Container>)' with [ _Container=std::string ] C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xutility(2176) : see reference to function template instantiation '_Iter &std::_Rechecked<_OutIt,_OutIt>(_Iter &,_UIter)' being compiled with [ _Iter=rpp::pp_output_iterator<std::string>, _OutIt=rpp::pp_output_iterator<std::string>, _UIter=rpp::pp_output_iterator<std::string> ] c:\qt\qtscriptgenerator\generator\parser\rpp\pp-internal.h(83) : see reference to function template instantiation '_OutIt std::copy<std::_String_iterator<_Elem,_Traits,_Alloc>,_OutputIterator>(_InIt,_InIt,_OutIt)' being compiled with [ _OutIt=rpp::pp_output_iterator<std::string>, _Elem=char, _Traits=std::char_traits<char>, _Alloc=std::allocator<char>, _OutputIterator=rpp::pp_output_iterator<std::string>, _InIt=std::_String_iterator<char,std::char_traits<char>,std::allocator<char>> ] c:\qt\qtscriptgenerator\generator\parser\rpp\pp-engine-bits.h(500) : see reference to function template instantiation 'void rpp::_PP_internal::output_line<_OutputIterator>(const std::string &,int,_OutputIterator)' being compiled with [ _OutputIterator=rpp::pp_output_iterator<std::string> ] C:\Program Files\Microsoft Visual Studio 10.0\VC\INCLUDE\xutility(275) : error C2582: 'operator =' function is unavailable in 'rpp::pp_output_iterator<_Container>' with [ _Container=std::string ] Here's some context.. pp-internal.h-- #ifndef PP_INTERNAL_H #define PP_INTERNAL_H #include <algorithm> #include <stdio.h> namespace rpp { namespace _PP_internal { .. 68 template <typename _OutputIterator> 69 void output_line(const std::string &__filename, int __line, _OutputIterator __result) 70 { 71 std::string __msg; 72 73 __msg += "# "; 74 75 char __line_descr[16]; 76 pp_snprintf (__line_descr, 16, "%d", __line); 77 __msg += __line_descr; 78 79 __msg += " \""; 80 81 if (__filename.empty ()) 82 __msg += "<internal>"; 83 else 84 __msg += __filename; 85 86 __msg += "\"\n"; 87 std::copy (__msg.begin (), __msg.end (), __result); 88 }

    Read the article

  • XSL to show highest number of copies in catalog.xml file

    - by SANJAY RAO
    In this the catalog.xml file. I have two books who have the same inventory (i.e. 20). I want to write an XSL file that will display the highest number of copies of a book in a catalog. If there are two or more books of the same inventory then they have to be displayed. <catalog> <Book> <sku>12345</sku> <title>Beauty Secrets</title> <condition>New</condition> <current_inventory>20</current_inventory> <price>99.99</price> </Book> <Book> <sku>54321</sku> <title>Picturescapes</title> <current_inventory>20</current_inventory> <condition>New</condition> <price>50.00</price> </Book> <Book> <sku>33333</sku> <title>Tourist Perspectives</title> <condition>New</condition> <current_inventory>0</current_inventory> <price>75.00</price> </Book> <Book> <sku>10001</sku> <title>Fire in the Sky</title> <condition>Used</condition> <current_inventory>0</current_inventory> <price>10.00</price> </Book> </catalog> Below is my catalog3.xsl file which is able to display only one out of the two books: <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > <xsl:variable name="max"/> <xsl:template match="/"> <html> <body> <h2>Titles of Books for which Most Copies are Available</h2> <table border="2"> <tr bgcolor="#9acd32"> <th>Title</th> <th>No of Copies</th> </tr> <xsl:apply-templates/> </table> </body> </html> </xsl:template> <xsl:template match="catalog"> <xsl:for-each select="Book"> <xsl:sort select="current_inventory" data-type="number" order="descending"/> <tr> <xsl:if test="position()= 1"> <p><xsl:value-of select="$max = "/></p> <td><xsl:value-of select="title"/></td> <td><xsl:value-of select="current_inventory"/></td> </xsl:if> </tr> </xsl:for-each> </xsl:template> </xsl:stylesheet> Could anybody correct me to achieve my goal of displaying all the copies having the same maximum inventory in the catalog. Thanks.

    Read the article

  • Firefox not running jQuery for XHTML output

    - by ScottSEA
    Okay, I did a crappy job of describing the issue in my previous post. I think the discussion got sidetracked from the core issue - so I'm going to try again. Mea Culpa to Elzo Valugi about the aforementioned thread. I have an XML file: <?xml version="1.0" encoding="utf-8"?> <?xml-stylesheet type="text/xsl" href="wtf.xsl"?> <Paragraphs> <Paragraph>Hi</Paragraph> </Paragraphs> Simple enough. I also have a stylesheet to create XHTML output: <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet version="1.0" xmlns="http://www.w3.org/1999/xhtml" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="xml" indent="yes" doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN" omit-xml-declaration="yes"/> <xsl:template match="/*"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>FF-JS-XHTML WTF</title> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="wtf.js"></script> </head> <body> <xsl:apply-templates /> </body> </html> </xsl:template> <xsl:template match="Paragraph"> <p> <xsl:apply-templates /> </p> </xsl:template> </xsl:stylesheet> Last but not least, I have the following jQuery in toto (wtf.js, from the script tag in the stylesheet): $(function() { alert('Hiya!'); $('<p>Hello</p>').appendTo('body'); }); Extremely simple, but sufficient for the demonstration. When I run this in Internet Explorer, I get the alert 'Hiya!' as well as the expected: Hi Hello but when I run it in Firefox (3.0.1), I still get the alert, but the jQuery does not insert the paragraph into the DOM, and I just get this: Hi If I change the stylesheet to method="html" it works fine, and I get (along with the alert): Hi Hello Why doesn't Firefox run the jQuery with an XHTML document? Has anyone any experience with this problem? EDIT: ADDITIONAL INFO I can successfully insert elements into the documents this way in Firefox (method="xml"): var frag = document.createDocumentFragment(); var p = document.createElement('p'); p.appendChild(document.createTextNode('Ipsum Lorem')); frag.appendChild(p); $('body').append(frag); but I'm running into a similar problem with the .remove() method. It is looking more and more that Firefox doesn't construct a DOM from XML that jQuery can relate to, or somesuch.

    Read the article

  • "Invalid form control" only in Google Chrome

    - by MFB
    The code below works well in Safari but in Chrome and Firefox the form will not submit. Chrome console logs the error An invalid form control with name='' is not focusable. Any ideas? Note that whilst the controls below do not have names, they should have names at the time of submission, populated by the Javascript below. The form DOES work in Safari. <form method="POST" action="/add/bundle"> <p> <input type="text" name="singular" placeholder="Singular Name" required> <input type="text" name="plural" placeholder="Plural Name" required> </p> <h4>Asset Fields</h4> <div class="template-view" id="template_row" style="display:none"> <input type="text" data-keyname="name" placeholder="Field Name" required> <input type="text" data-keyname="hint" placeholder="Hint"> <select data-keyname="fieldtype" required> <option value="">Field Type...</option> <option value="Email">Email</option> <option value="Password">Password</option> <option value="Text">Text</option> </select> <input type="checkbox" data-keyname="required" value="true"> Required <input type="checkbox" data-keyname="search" value="true"> Searchable <input type="checkbox" data-keyname="readonly" value="true"> ReadOnly <input type="checkbox" data-keyname="autocomplete" value="true"> AutoComplete <input type="radio" data-keyname="label" value="label" name="label"> Label <input type="radio" data-keyname="unique" value="unique" name="unique"> Unique <button class="add" type="button">+</button> <button class="remove" type="button">-</button> </div> <div id="target_list"></div> <p><input type="submit" name="form.submitted" value="Submit" autofocus></p> </form> <script> function addDiv() { var pCount = $('.template-view', '#target_list').length; var pClone = $('#template_row').clone(); $('select, input, textarea', pClone).each(function(idx, el){ $el = $(this); if ((el).type == 'radio'){ $el.attr('value', pCount + '_' + $el.data('keyname')); } else { $el.attr('name', pCount + '_' + $el.data('keyname')); }; }); $('#target_list').append(pClone); pClone.show(); } function removeDiv(elem){ var pCount = $('.template-view', '#target_list').length; if (pCount != 1) { $(elem).closest('.template-view').remove(); } }; $('.add').live('click', function(){ addDiv(); }); $('.remove').live('click', function(){ removeDiv(this); }); $(document).ready(addDiv); </script>

    Read the article

  • How does versioning work when using Boost Serialization for Derived Classes?

    - by Venkata Adusumilli
    When a Client serializes the following data: InternationalStudent student; student.id("Client ID"); student.firstName("Client First Name"); student.country("Client Country"); the Server receives the following: ID = "Client ID" Country = "Client First Name" instead of the following: ID = "Client ID" Country = "Client Country" The only difference between the Server and Client classes is the First Name of the Student. How can we make the Server ignore First Name recieved from the Client and process the Country? Server Side Classes class Student { public: Student(){} virtual ~Student(){} public: std::string id() { return idM; } void id(std::string id) { idM = id; } protected: friend class boost::serialization::access; protected: std::string idM; protected: template<class A> void serialize(A& archive, const unsigned int /*version*/) { archive & BOOST_SERIALIZATION_NVP(idM); } }; class InternationalStudent : public Student { public: InternationalStudent() {} ~InternationalStudent() {} public: std::string country() { return countryM; } void country(std::string country) { countryM = country; } protected: friend class boost::serialization::access; protected: std::string countryM; protected: template<class A> void serialize(A& archive, const unsigned int /*version*/) { archive & BOOST_SERIALIZATION_NVP(boost::serialization::base_object<Student>(*this)); archive & BOOST_SERIALIZATION_NVP(countryM); } }; Client Side Classes class Student { public: Student(){} virtual ~Student(){} public: std::string id() { return idM; } void id(std::string id) { idM = id; } std::string firstName() { return firstNameM; } void firstName(std::string name) { firstNameM = name; } protected: friend class boost::serialization::access; protected: std::string idM; std::string firstNameM; protected: template<class A> void serialize(A& archive, const unsigned int /*version*/) { archive & BOOST_SERIALIZATION_NVP(idM); if (version >=1) { archive & BOOST_SERIALIZATION_NVP(firstNameM); } } }; BOOST_CLASS_VERSION(Student, 1) class InternationalStudent : public Student { public: InternationalStudent() {} ~InternationalStudent() {} public: std::string country() { return countryM; } void country(std::string country) { countryM = country; } protected: friend class boost::serialization::access; protected: std::string countryM; protected: template<class A> void serialize(A& archive, const unsigned int /*version*/) { archive & BOOST_SERIALIZATION_NVP(boost::serialization::base_object<Student>(*this)); archive & BOOST_SERIALIZATION_NVP(countryM); } };

    Read the article

  • Feedback on iterating over type-safe enums

    - by Sumant
    In response to the earlier SO question "Enumerate over an enum in C++", I came up with the following reusable solution that uses type-safe enum idiom. I'm just curious to see the community feedback on my solution. This solution makes use of a static array, which is populated using type-safe enum objects before first use. Iteration over enums is then simply reduced to iteration over the array. I'm aware of the fact that this solution won't work if the enumerators are not strictly increasing. template<typename def, typename inner = typename def::type> class safe_enum : public def { typedef typename def::type type; inner val; static safe_enum array[def::end - def::begin]; static bool init; static void initialize() { if(!init) // use double checked locking in case of multi-threading. { unsigned int size = def::end - def::begin; for(unsigned int i = 0, j = def::begin; i < size; ++i, ++j) array[i] = static_cast<typename def::type>(j); init = true; } } public: safe_enum(type v = def::begin) : val(v) {} inner underlying() const { return val; } static safe_enum * begin() { initialize(); return array; } static safe_enum * end() { initialize(); return array + (def::end - def::begin); } bool operator == (const safe_enum & s) const { return this->val == s.val; } bool operator != (const safe_enum & s) const { return this->val != s.val; } bool operator < (const safe_enum & s) const { return this->val < s.val; } bool operator <= (const safe_enum & s) const { return this->val <= s.val; } bool operator > (const safe_enum & s) const { return this->val > s.val; } bool operator >= (const safe_enum & s) const { return this->val >= s.val; } }; template <typename def, typename inner> safe_enum<def, inner> safe_enum<def, inner>::array[def::end - def::begin]; template <typename def, typename inner> bool safe_enum<def, inner>::init = false; struct color_def { enum type { begin, red = begin, green, blue, end }; }; typedef safe_enum<color_def> color; template <class Enum> void f(Enum e) { std::cout << static_cast<unsigned>(e.underlying()) << std::endl; } int main() { std::for_each(color::begin(), color::end(), &f<color>); color c = color::red; }

    Read the article

  • How to create a HTML5 + SVG document using the PHP XSLTProcessor

    - by Kau-Boy
    For a little project about XML I try to use HTML5 as it has SVG and WAI-ARIA Support. I also want to use a XSL stylesheet for my document. But I can't get a valid HTML5 document with a nested SVG. Here are some version I tested so far: <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output indent="yes" method="xml"/> <xsl:template match="/"> <html xmlns="http://www.w3.org/1999/xhtml"> // content with the svg tag in the body </html> </xsl:template> </xsl:stylesheet> In combination with header('Content-Type: application/xml'); it works and produces this HTML output: <?xml version="1.0"?> <html xmlns="http://www.w3.org/1999/xhtml"> // content with the svg tag in the body </html> But it is not HTML5 and without a DOCTYPE I get a lot of errors on the W3 validator. So trying to get a HTML5 document I used the following XSL: <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output indent="yes" method="html"/> <xsl:template match="/"> <xsl:text disable-output-escaping='yes'>&lt;!DOCTYPE HTML></xsl:text> <html> // content with the svg tag in the body </html> </xsl:template> </xsl:stylesheet> But unfortunately that will produce thze following HTML output: <!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> .... </head> // content with the svg tag in the body </html> As you can see it's regular HTML5 but using it in combination with header('Content-Type: application/xml'); it fails because of the missing slash at the end of the meta tag (which was automatically created). Using header('Content-Type: image/xhtml+svg'); or header('Content-Type: text/html'); there is no XML parsing error, but the page will not show the SVG as a graph but as text (without the tags). Can anyone tell me how to avoid the meta tag to be inserted or how to set a propper Content-Type that will make the browser rendern the SVG. Or even any other hint to get this working. I would really like to keep HTML5 to be able to keep the WAI-ARIA Landmark Roles an the HTML5 tags like NAV and FOOTER.

    Read the article

  • Trying to write a std::iterator : Compilation error

    - by Naveen
    I am trying to write an std::iterator for the CArray<Type,ArgType> MFC class. This is what I have done till now: template <class Type, class ArgType> class CArrayIterator : public std::iterator<std::random_access_iterator_tag, ArgType> { public: CArrayIterator(CArray<Type,ArgType>& array_in, int index_in = 0) : m_pArray(&array_in), m_index(index_in) { } void operator++() { ++m_index; } void operator++(int) { ++m_index; } void operator--() { --m_index; } void operator--(int) { --m_index; } void operator+=(int n) { m_index += n; } void operator-=(int n) { m_index -= n; } typename ArgType operator*() const{ return m_pArray->GetAt(m_index); } typename ArgType operator->() const { return m_pArray->GetAt(m_index); } bool operator==(const CArrayIterator& other) const { return m_pArray == other.m_pArray && m_index == other.m_index; } bool operator!=(const CArrayIterator& other) const { return ! (operator==(other)); } private: CArray<Type,ArgType>* m_pArray; int m_index; }; I also provided two helper functions to create the iterators like this: template<class Type, class ArgType> CArrayIterator<Type,ArgType> make_begin(CArray<Type,ArgType>& array_in) { return CArrayIterator<Type,ArgType>(array_in, 0); } template<class Type, class ArgType> CArrayIterator<Type,ArgType> make_end(CArray<Type,ArgType>& array_in) { return CArrayIterator<Type,ArgType>(array_in, array_in.GetSize()); } To test the code, I wrote a simple class A and tried to use it like this: class A { public: A(int n): m_i(n) { } int get() const { return m_i; } private: int m_i; }; struct Test { void operator()(A* p) { std::cout<<p->get()<<"\n"; } }; int main(int argc, char **argv) { CArray<A*, A*> b; b.Add(new A(10)); b.Add(new A(20)); std::for_each(make_begin(b), make_end(b), Test()); return 0; } But when I compile this code, I get the following error: Error 4 error C2784: 'bool std::operator <(const std::_Tree<_Traits &,const std::_Tree<_Traits &)' : could not deduce template argument for 'const std::_Tree<_Traits &' from 'CArrayIterator' C:\Program Files\Microsoft Visual Studio 9.0\VC\include\xutility 1564 Vs8Console Can anybody throw some light on what I am doing wrong and how it can be corrected? I am using VC9 compiler if it matters.

    Read the article

< Previous Page | 372 373 374 375 376 377 378 379 380 381 382 383  | Next Page >