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• Storing expression template functors

  - by UncaughtException

  Hello guys, at the moment I'm really interested in expression templates and want to code a library for writing and differentiating mathematical functions with a lambda-style syntax. At the moment, I'm able to write (_x * _x)(2); and get the correct result 4. But I would really like to do something like MathFunction f = _x * _x; f(2);, but I don't have any ideas on how to cope with the recursive expression templates on the right side. Is it possible to achieve this without using the 'auto'-Keyword instead of MathFunction or having to make the operator() virtual? Thanks for your help!

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• scripting subtlties [closed]

  - by jpmyob

  Possible Duplicates: When to use anonymous JavaScript functions? Is there any difference between var name = function() {} & function name() {} in Javascript? in javascript (and other scripting languages) what is the 'real' difference between these two syntax: a) function myFun(x) { yadda yadda } b) myFun(x) = function { yadda yadda } to a casual observer - no 'real' difference - you still call either as myFun()...and they still return the same thing, so if reference and return are identical - is it a preference or is there some difference in the code parsing engine that treats these two differently - and if so - when would you use one over the other???

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• Integer v/s int

  - by Siddhartha

  Read this on the oracle docs java.lang page: Frequently it is necessary to represent a value of primitive type as if it were an object. The wrapper classes Boolean, Character, Integer, Long, Float, and Double serve this purpose. I'm not sure I understand why these are needed. It says they have useful functions such as equals(). But if I can do (a==b), why would I ever want to declare them as Integer, use more memory and use equals()? How does the memory usage differ for the 2?

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• Infor PM (Business Intelligence solution)

  - by Andrew

  We are currently implementing the commercial Infor PM (Performance Management) package as a business intelligence tool. Infor PM website It is apparently used by over 1,000 companies around the world, but I have found scant information about it on the net except for what's on their own website. It covers the whole range of data warehousing and BI functions with: an OLAP environment an ETL tool a report writer (called Application Studio) an add-on to Excel to connect to the data in the cubes through a pivot table etc Does anyone have any experience with using this package? How does it compare to the big players in BI (Cognos, Microsoft SSAS, Business Objects, etc). Any pitfalls I should know about? On the other hand, does it do anything better than its competitors?

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• is DISPID_VALUE reliable for invokes on IDispatchs from scripts?

  - by Georg Fritzsche

  Continuing from this question, i am confused whether DISPID_VALUE on IDispatch::Invoke() for script functions and properties (JavaScript in my case) can be considered standard and reliable for invoking the actual function that is represented by the IDispatch? If yes, is that mentioned anywhere in MSDN? Please note that the question is about if that behaviour can be expected, not what some interfaces i can't know in advance might look like. A simple use case would be: // usage in JavaScript myObject.attachEvent("TestEvent", function() { alert("rhubarb"); }); // handler in ActiveX, MyObject::attachEvent(), C++ incomingDispatch->Invoke(DISPID_VALUE, IID_NULL, LOCALE_SYSTEM_DEFAULT, DISPATCH_METHOD, par, res, ex, err); edit: tried to clarify the question.

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• sigprocmask not working

  - by EpsilonVector

  I'm using sigprocmask as follows: void mask(){ sigset_t new_set,old_set; sigemptyset(&new_set); sigaddset(&new_set,SIGALRM); sigprocmask(SIG_BLOCK, &new_set, &old_set); } and to my surprise a function which prints a big list somehow gets interrupted by the signal, even though I invoke mask() at its beginning. It looks as if mask fails, since my function doesn't invoke any other functions and therefore nowhere in its run should an unmask() happen. What can cause sigprocmask to fail?

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• How I can move table to another filegroup ?

  - by denisioru

  Hello, I have MSSQL 2008 Ent and OLTP database with two big tables. How I can move this tables to another filegroup without service interrupting? Now, about 100-130 records inserted and 30-50 records updated each second in this tables. Each table have about 100M records and six fields (including one field geography). I looking for solution via google, but all solutions contain "create second table, insert rows from first table, drop first table, bla bla bla". Can I use partitioning functions for solving this problem? Thank you.

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• Codeigniter error logs show a 404 non-existing images directory...need to worry?

  - by user342199

  I've recently started logging my errors through codeIgniter. Since doing so, I have noticed a lot of 404 errors for directories that don't exist. For example: ERROR - 2010-05-15 21:06:26 -- 404 Page Not Found -- someController/images Where someController is, obviously, a controller. The problem is, there are no functions within that controller called images, nor are there any links to a directory by that name. Could this be that someone is trying to hack my site? If so, do I need to worry? If not, why is this happening? Thanks, and forgive the newby-ness.

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• Ajax, not sending querystring data

  - by Tom Gullen

  var http = false; // Creates xmlhttp object if (navigator.appName == "Microsoft Internet Explorer") { http = new ActiveXObject("Microsoft.XMLHTTP"); } else { http = new XMLHttpRequest(); } http.onreadystatechange = function() { if (http.readyState == 4) { alert(http.responseText); } } // Functions to calculate optimum layout etc. function compute() { var statusSpan = document.getElementById("cwStatus"); document.getElementById("fader").style.display = ""; document.getElementById("computingWait").style.display = ""; statusSpan.innerHTML = "<b>Status:</b> Realigning sattelites" http.open("GET", "alg.aspx?cr=8&cc=7&sq=3,3", true); http.send(null); } This code sort of works, but the querystring data isn't being passed through. It keeps returning an ASPX error page which only happens when there is no querystring data. Thanks for any help

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• qt custom widgets propertis are not getting updated properly in Qt designer

  - by user553911

  I have created a custom widget. The widget gets loaded fine,the properties appear in QT Designer, Only problem is every time I change the property of Alpha key,the numeric also gets set, Though the accessor functions are different,and the enums are differnet and values are different. Also whenever i check the Form-view code,the values would have got modified. Am i Missing something or this is a designer issue,Any workarounds would be appreciated class key { Q_PROPERTY(AlphKeycode_t AlphKeycode READ AlphKeycode WRITE setAlphKeycode); Q_PROPERTY(bool AlphKey READ isAlph WRITE setAlph); Q_ENUMS(AlphKeycode_t); Q_PROPERTY(NumKeycode_t NumKeycode READ NumeKeycode WRITE setNumKeycode); Q_PROPERTY(bool NumKey READ isNum WRITE setNum); Q_ENUMS(NumKeycode_t); } struct AlphData { QString label; bool isAlphabetic; }; struct NumData { QString label; bool isNumeric; }; AlphData AlphKeyData[] = { {"q",true }, } NumData NumKeyData[] = { {"1", false}, }

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• Wait for function to finish before executing the rest

  - by Wurlitzer

  When the user refreshes the page, defaultView() is called, which loads some UI elements. $.address.change() should execute when defaultView() has finished, but this doesn't happen all the time. $.address.change() cannot be in the success: callback, as it's used by the application to track URL changes. defaultView(); function defaultView() { $('#tout').fadeOut('normal', function() { $.ajax({ url: "functions.php", type: "GET", data: "defaultview=true", async: false, success: function (response) { $('#tout').html(response).fadeIn('normal'); } }); }); } $.address.change(function(hash) { hash = hash.value; getPage(hash); }); I'm at a loss as to how to make $.address.change() wait for defaultView() to finish. Any help would be appreciated.

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• What is the difference between an object's scope and it's context in javascript?

  - by DKinzer

  In the vernacular, scope and context have a lot in common. Which is why I get confused when I read references to both, such as in the quote below from an article on closures: Scope refers to where variables and functions are accessible, and in what context it is being executed. (@robertnyman) As far as I can tell, context is just a reference to an object. Can someone please explain what exactly is context, as used, for instance, in the jQuery syntax, $(selector, context). And is an object's scope the same at it's context?

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• Debugging ASP.NET in VS

  - by negligible

  A lot of what I'm doing at the moment is figuring out other peoples code and adding or adapting functions, so currently I am debugging more than I am writing code of my own. I'm still new to this, Junior Developer, and I am always finding new ways to improve what I am doing. For example I recently found This Guide which had some excellent tips, such as overriding the ToString() method in your classes so children are readable from their parents. So I am looking for any other tips or tricks to make my debugging more efficient, as I recognise it as a big part of programming, that you more experienced programmers may have picked up or found. Anything appreciated, I can read websites just fine so no need to explain it yourself if you have a good link!

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• Document/Scripts management for R code

  - by harshsinghal

  Hi useRs, I am looking for a solution that allows me to keep a track of a multitude of R scripts that I create for various projects and purposes. Some scripts are easily tracked to specific projects, whereas others are "convenience" functions created to serve a set of tasks. Is there a way I can create a central DB and query it to find which scripts match most appropriately? I could create a system using a DBMS manually, but are users aware of anything in general or specific to R, that comes in the form of a software tool (maybe FOSS) ?

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• Two buttons in a form, Both called

  - by coffeeaddict

  Here's my ASP.NET form. When I click one button it calls both jQuery functions. It's probably a rudimentary HTML question but I'm not sure why: <form id="form1" runat="server"> <div id="testDialog"> </div> <p><input type="button" id="invoke1" value="test 1" /></p> <input type="button" id="invoke2" value="test 2" /> </form> <script type="text/javascript"> $(function() { $("input:invoke1").click(function(){ showSomething("testDialog"); }); $("input:invoke2").click(function(){ showSomething2("test.aspx", options); }); }); </script>

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• Reordering Lists like playlists in the media player

  - by CrazyBS

  Hi, I have a list of items that are displayed using a ListView from a SQLCursor. The SQL table includes(as well as other things) a _id field and an order field. I use the order field to sort the list before it gets to the ListView. What I need is a widget like the MediaPlayer has in its playlist view. It allows you to click the icon and drag the item in the playlist around and put it into a new order. With that ability I can then retrieve the new order and update the SQL table with the new order. However, I am not having any luck finding any clues to help me add that functionality into my program. The question is whether I can use existing functions to help me, or do I need to manually program motion events and such until I get nearly the same functionality.

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• C++ conversion operator between types in other libraries

  - by Dave

  For convenience, I'd like to be able to cast between two types defined in other libraries. (Specifically, QString from the Qt library and UnicodeString from the ICU library.) Right now, I have created utility functions in a project namespace: namespace MyProject { const icu_44::UnicodeString ToUnicodeString(const QString& value); const QString ToQString(const icu_44::UnicodeString& value); } That's all well and good, but I'm wondering if there's a more elegant way. Ideally, I'd like to be able to convert between them using a cast operator. I do, however, want to retain the explicit nature of the conversion. An implicit conversion should not be possible. Is there a more elegant way to achieve this without modifying the source code of the libraries? Some operator overload syntax, perhaps?

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• What SQL ORM may i use to replace this old code

  - by acidzombie24

  Sorry since this question is specific to my problem. While learning reflections i did a mini SQL ORM in a week then minor tweaks while using it for another week. Since it has very little work put into it, its really only compatibility with sqlite. I havent had problems with the code so far but i would like to port it to something that supports TSQL or MySql. The example code is here which is outdated but has the most used functions in my class. What library can i port that code over too with the smallest about of pain. Note that it must support foreign keys.

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• How to explicitly terminate http connection from server with no response header

  - by Gagandip

  I am developing a server simulator for one of my client application. I am using GlassFish server. I have to simulate a http connection terminate condition in my server application. Is there a way by which I can explicitly terminate a connection from server side such that client does not receive any response header. Currently I have tried many options like closing the response outputStream. But in every case a http 200 OK message is delivered to the client application. I would like to consume the http-request and do not want to return anything to the client. I am using a simple conrtroller servlet and had overridden doGet() and doPost() functions.

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• copy C'tor with operator= | C++

  - by user2266935

  I've got this code here: class DerivedClass : public BaseClass { SomeClass* a1; Someclass* a2; public: //constructors go here ~DerivedClass() { delete a1; delete a2;} // other functions go here .... }; My first question is as follows: Can I write an "operator=" to "DerivedClass" ? (if your answer is yes, could you show me how?) My second question is: If the answer to the above is yes, could you show me how to make an "copy c'tor" using the "operator=" that you wrote beforehand (if that is even possible)? Your help would be much appreciated !

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• How should I build a gaming community

  - by Przystojny

  I've been wanting to build my own gaming community site (like http://fragbite.com) for a long time, I have started many times but just quitted after a couple days because it gets very messy I've been palying around with php and mysql off and on for 3 years but i've never gotten in to oop. i have tried but i usually end up with the "old php". I usually build my pages like so that i include a file on top of all pages with neccasary functions, html head etc. And I mix php and html together which I dont mind but if I eventually would get a designer he would not like it i think. I have tried both phpcake and codeigniter and all those popular mvc's but its just to much, like they do all the work. i want to do it myself. but i dont know where to start. What would you do if you were me? Is there maybe some non-oop mvc? (Sorry for my english)

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• What to do if exec() fails?

  - by Grigory

  Let's suppose we have a code doing something like this: int pipes[2]; pipe(pipes); pid_t p = fork(); if(0 == p) { dup2(pipes[1], STDOUT_FILENO); execv("/path/to/my/program", NULL); ... } else { //... parent process stuff } As you can see, it's creating a pipe, forking and using the pipe to read the child's output (I can't use popen here, because I also need the PID of the child process for other purposes). Question is, what should happen if in the above code, execv fails? Should I call exit() or abort()? As far as I know, those functions close the open file descriptors. Since fork-ed process inherits the parent's file descriptors, does it mean that the file descriptors used by the parent process will become unusable?

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• Manage widgets from page edit screen

  - by Greenie

  Hi there. I'm looking to find a way to integrate the widget control area into the page edit screen. For the site I'm making it would be perfect with the same drag and drop functionality. I want a list of the available widgets that I can drag and drop into the page widget area. The widgets will then only be shown on that particular page. I've looked through the wp-admin/widgets.php file and tried to use some code from there. I even tried just including widgets.php at the end of the post.php (which is basically what I want, but of course gave me funny results). Please don't suggest plug-ins like Widget Context or Widget Logic. Those are my fallback if I cant do this :) So I would like ideas and/or input on how to accomplish this. Preferably I'd like to do it in the functions.php file, or in a plug-in.

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• How are clientside security vulnerabilities generally discovered?

  - by Jehjoa

  I mean in operating systems or their applications. The only way I can think of is examine binaries for the use of dangerous functions like strcpy(), and then try to exploit those. Though with compiler improvements like Visual Studio's /GS switch this possibility should mostly be a thing of the past. Or am I mistaken? What other ways do people use to find vulnerabilities? Just load your target in a debugger, then send unexpected input and see what happens? This seems like a long and tedious process. Could anyone recommend some good books or websites on this subject? Thanks in advance.

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• Compiling C-dll for Python OR SWIG-module creation, how to continue ??

  - by ljuju

  I reference this file "kbdext.c" and its headerfile listed on http://www.docdroppers.org/wiki/index.php?title=Writing_Keyloggers (the listings are at the bottom). I've been trying to compile this into a dll for use in Python or Visual Basic, but have not succeeded. I'm not familiar with C or GCC to sort out the problems or do the dll compile correctly. (I also get an error about snprintf not being declared when doing a regular compile of all the files). What are the steps I should do to make all functions available for other languages and external apps? Or is it perhaps easier to use SWIG and make a python module, instead of compiling a DLL?

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