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• a class function with if(this==NULL) test got compiled?

  - by James

  I saw this code snippet during our lab and it actually compiles in MSVC2008 and G++. void LinkList< class T ::Insert(T n) { if (this == NULL) // some code here } As far as I know the this must not be null since you cannot call a class functions in c++ if it wasn't instantiated. Is this a valid code? if so what's the reason behind and where it can be useful?

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• Proper configuration for Windows SMTP Virtual Server to only send email from localhost, and tracking down source of spam emails

  - by ilasno

  We manage a server that is hosted on Amazon EC2, which has web applications that need to be able to send outgoing email. Recently we received a notice from Amazon about possible email abuse on that server, so i've been looking into it. It's Windows Server Datacenter (2003, i guess), and uses SMTP Virtual Server (you know, the one that requires IIS 6 for admin). The settings on the Access tab are as follows: - Authentication: Anonymous - Connection: Only from 3 ip addresses (127.0.0.1 and 2 others that refer to that server) - Relay: Only from 3 ip addresses (127.0.0.1 and 2 others that refer to that server) In the SMTP logs there are many entries like the following: 2012-02-08 23:43:56 64.76.125.151 OutboundConnectionCommand SMTPSVC1 FROM: 0 0 4 0 26364 SMTP - - - - 2012-02-08 23:43:56 64.76.125.151 OutboundConnectionResponse SMTPSVC1 250+ok 0 0 6 0 26536 SMTP - - - - 2012-02-08 23:43:56 64.76.125.151 OutboundConnectionCommand SMTPSVC1 TO: 0 0 4 0 26536 SMTP - - - - 2012-02-08 23:43:56 64.76.125.151 OutboundConnectionResponse SMTPSVC1 250+ok 0 0 6 0 26707 SMTP - - - - ([email protected] is sending quite a lot of emails :-/) Can anyone confirm if the SMTP server settings seem correct? I'm also wondering if a web application on the machine could be exposing a contact form or something that would allow this sort of abuse, looking into that (and how to look into that) further.

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• Overloading new, delete in C++

  - by user265260

  i came across this line is stroustrup An operator function must either be a member or take at least one argument of a user-defined type (functions redefining the new and delete operators need not). Dont operator new and operator delete take an user defined type as one of their arguments? what does it mean, am i missing something here

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• Find out why Xcode has decided to link to a particular library

  - by andygeers

  I'm using the Unity 3D engine to build an iPhone app, and when I go to generate my Xcode project for compilation, it includes a few fairly large libraries: Mono.Security.dll.s, System.dll.s, System.Core.dll.s, etc. I don't know if this question is really an Xcode question or a Unity question, but I'm trying to figure out why each of those libraries is being linked - which functions / classes are being referenced - ideally so that I can rewrite my code to remove as many of the dependencies as possible. Does anybody know a way to find this information out?

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• Specializating a template function that takes a universal reference parameter

  - by David Stone

  How do I specialize a template function that takes a universal reference parameter? foo.hpp: template<typename T> void foo(T && t) // universal reference parameter foo.cpp template<> void foo<Class>(Class && class) { // do something complicated } Here, Class is no longer a deduced type and thus is Class exactly; it cannot possibly be Class &, so reference collapsing rules will not help me here. I could perhaps create another specialization that takes a Class & parameter (I'm not sure), but that implies duplicating all of the code contained within foo for every possible combination of rvalue / lvalue references for all parameters, which is what universal references are supposed to avoid. Is there some way to accomplish this? To be more specific about my problem in case there is a better way to solve it: I have a program that can connect to multiple game servers, and each server, for the most part, calls everything by the same name. However, they have slightly different versions for a few things. There are a few different categories that these things can be: a move, an item, etc. I have written a generic sort of "move string to move enum" set of functions for internal code to call, and my server interface code has similar functions. However, some servers have their own internal ID that they communicate with, some use strings, and some use both in different situations. Now what I want to do is make this a little more generic. I want to be able to call something like ServerNamespace::server_cast<Destination>(source). This would allow me to cast from a Move to a std::string or ServerMoveID. Internally, I may need to make a copy (or move from) because some servers require that I keep a history of messages sent. Universal references seem to be the obvious solution to this problem. The header file I'm thinking of right now would expose simply this: namespace ServerNamespace { template<typename Destination, typename Source> Destination server_cast(Source && source); } And the implementation file would define all legal conversions as template specializations.

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• Get Asp.Net username from SQL Server 2008?

  - by jlnorsworthy

  With windows and sql server accounts, I can access the logged in user with functions like: user_name() or suser_sname(). Can I access the user that is logged into asp.net in the same way?

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• output with "Private`" Content in Mathematica Package

  - by madalina

  Hello everyone, I am trying to solve the following implementation problem in Mathematica 7.0 for some days now and I do not understand exactly what is happening so I hope someone can give me some hints. I have 3 functions that I implemented in Mathematica in a source file with extension *.nb. They are working okay to all the examples. Now I want to put these functions into 3 different packages. So I created three different packages with extension .*m in which I put all the desired Mathematica function. An example in the "stereographic.m" package which contain the code: BeginPackage["stereographic`"] stereographic::usage="The package stereographic...." formEqs::usage="The function formEqs[complexBivPolyEqn..." makePoly::usage="The function makePoly[algebraicEqn] ..." getFixPolys::usage="The function..." milnorFibration::usage="The function..." Begin["Private`"] Share[]; formEqs[complex_,{m_,n_}]:=Block[{complexnew,complexnew1, realeq, imageq, expreal, expimag, polyrealF, polyimagF,s,t,u,v,a,b,c,epsilon,x,y,z}, complexnew:=complex/.{m->s+I*t,n->u+I*v}; complexnew1:=complexnew/.{s->(2 a epsilon)/(1+a^2+b^2+c^2),t->(2 b epsilon)/(1+a^2+b^2+c^2),u->(2 c epsilon)/(1+a^2+b^2+c^2),v->(- epsilon+a^2 epsilon+b^2 epsilon+c^2 epsilon)/(1+a^2+b^2+c^2)}; realeq:=ComplexExpand[Re[complexnew1]]; imageq:=ComplexExpand[Im[complexnew1]]; expreal:=makePoly[realeq]; expimag:=makePoly[imageq]; polyrealF:=expreal/.{a->x,b->y,c->z}; polyimagF:=expimag/.{a->x,b->y,c->z}; {polyrealF,polyimagF} ] End[] EndPackage[] Now to test the function I load the package Needs["stereographic`"] everything is okay. But when I test the function for example with formEqs[x^2-y^2,{x,y}] I get the following ouput: {Private`epsilon^2 + 2 Private`x^2 Private`epsilon^2 + Private`x^4 Private`epsilon^2 - 6 Private`y^2 Private`epsilon^2 + 2 Private`x^2 Private`y^2 Private`epsilon^2 + Private`y^4 Private`epsilon^2 - 6 Private`z^2 Private`epsilon^2 + 2 Private`x^2 Private`z^2 Private`epsilon^2 + 2 Private`y^2 Private`z^2 Private`epsilon^2 + Private`z^4 Private`epsilon^2, 8 Private`x Private`y Private`epsilon^2 + 4 Private`z Private`epsilon^2 - 4 Private`x^2 Private`z Private`epsilon^2 - 4 Private`y^2 Private`z Private`epsilon^2 - 4 Private`z^3 Private`epsilon^2} Of course I do not understand why Private` appears in front of any local variable which I returned in the final result. I would want not to have this Private` in the computed output. Any idea or better explanations which could indicate me why this happens? Thank you very much for your help. Best wishes, madalina

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• Is there a full REPL for Erlang?

  - by Gabriel Cuvillier

  Is there a way to have a full interpreter in Erlang, not just a "shell". Since it is a dynamic language, not being able to define named functions in the interpreter is a little bit disappointing... I suspect that it is because compilation units (modules) must be explicitly compiled for their execution by the VM, but maybe a REPL acting as a dynamic/recompilable module exist?

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• Problem with the POSIX module

  - by planetp

  After moving my mod_perl site from Linux hosting to FreeBSD, I have this error in the logfile: Your vendor has not defined POSIX macro SIGRTMIN, used at ../../lib/POSIX.pm (autosplit into ../../lib/auto/POSIX/SigRt/_init.al) line 993\n The script just imports POSIX and utilizes some functions (ceil, etc) How can I solve this issue ?

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• 3D plotting in Matlab

  - by Jill

  I'm using the subplot and then surf functions to generate images in 3D in Matlab. How do I get rid of the axes and axis' gridlines and change the color to all yellow or all green or something like that? Thanks.

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• In flex how do I pass data retrieved from a remote object service to a modules interface?

  - by Dan G

  I found at this Adobe tutorial a nice "RemoteService" class that creates a RemoteObject and contains the functions for handling the result and fault events. If I wanted to use this approach, how could I pass the data from the result handler to interfaces that modules from the main application could use? I could put the RemoteService/RemoteObject in the modules, but (in my opinion- and I could be wrong) the best design seems to be using the remote calls in the main app and passing the data along to the modules.

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• Can an algorithmic process ever give true random numbers ?

  - by Arkapravo

  I have worked with random functions in python,ruby, MATLAB, Bash and Java. Nearly every programming language has a function to generate Random numbers. However, these apparently random sequences are termed as pseudo-random number sequences as the generation follows a deterministic approach, and the sequence seems to repeat (usually with a very large period). My question, can an algorithmic/programming process ever yield true random numbers ? The questions probably is more of theoretical computer science than just programming !

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• OpenCV performance in different languages

  - by h0b0

  I'm doing some prototyping with OpenCV for a hobby project involving processing of real time camera data. I wonder if it is worth the effort to reimplement this in C or C++ when I have it all figured out or if no significant performance boost can be expected. The program basically chains OpenCV functions, so the main part of the work should be done in native code anyway.

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• How to Convert Boolean to String

  - by tag

  I have a boolean variable which I want to convert to a string $res = true; I need it the converted value to also be in the format "true" "false" not "0" "1" $converted_res = "true"; $converted_res = "false"; I've tried: $converted_res = string($res); $converted_res = String($res); but it tells me string and String are not recognized functions. How do I convert this boolean to a string in the format "true" or "false" in php?

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• IIS6 site using integrated authentication (NTLM) fails when accessed with Win7 / IE8

  - by Ciove

  Hi, I'm having pretty similar problems as described in case 139099, but the fix there doesn't seem to work for me. Here's the details: Server: Win2003Srv R2 SP2 (stadalone, not a member of a domain). IIS6, TCP/443 (https). Anonymous access disabled. Integrated Windows authentication enabled. Local useraccouts Each useraccount has own virtual folder with change access and read access to site root. The 'adsutil NTAuthenticationProviders "NTLM"' -thing set to site root and useraccount's virtual folder. Client: Win7 Enterprise Member of a AD-Domain IE8 Allows three login attepts then fails. Using [webservername][username] in the logon window (Windows security) Logon using other browsers (Chrome and Firefox) works OK. The Web services log shows one 401.2 and two 401.1 events. The Security Event log shows two events, first is Fauilure Audit (680), The second event is Fauilure Audit (529) with these details: Logon Failure: Reason: Unknown user name or bad password User Name: [username] Domain: [webservername] Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: [MyWorkstation] Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: [999.999.999.999] Source Port: 20089 Any ideas appreciated.

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• adding javascript events to freemind maps

  - by pri_dev

  I have created freemind maps using the tool, right now in the process of integrating the map with my web application. I have some questions on the usage of freemind maps 1) Instead of using the freemindbrowser.html and the jar file to integrate a map with a website/ web app, can we do an export to Javascript from the tool and then integrate that exported file (.html) with the web site? 2) I want to be able to add javascript functions on events like node click, how do I do that? Thanks in Advance

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• How do you avoid an invalid search space in a genetic algorithm?

  - by Dave

  I am developing a GA for a school project and I've noticed that upon evaluating my functions for fitness, an individual is equivalent to its inverse. For example, the set (1, 1, -1, 1) is equivalent to (-1, -1, 1, -1). To shrink my search space and reach a solution more efficiently, how can I avoid my crossovers from searching in this second half of the search space?

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• What is a de-compiler how does it work?

  - by thyrgle

  So is a decompiler really a thing that gives gives the source of a compiled/interpreted piece of code? Because to me that sounds impossible. How would you get the names of the functions, variables, classes, etc if it is compiled. Or am I misinterpreting the definition? How does it work? And what is the general principal behind making one?

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• Dynamic content doesn't work when loaded with ajax

  - by Wurlitzer

  I'm trying to load some dynamic content after the user has logged in, using $.ajax, like so: $.ajax({ url: "functions.php", type: "GET", data: login_info, datatype: 'html', async: false, success: function (response) { $('#main').html(response); } }); The problem is, that some events don't work, when loaded this way. I fixed the buttons with the .live() method, but a sortable list for example, doesn't work. How can I somehow refresh the DOM, and let jquery know of these new added elements? Thanks!

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• Prototype's update not working with IE

  - by xain

  Hi, I'm having problems updating a div's content in IE using .update; I also tried with innerHTML with no success. My script works fine with firefox and chrome, but I need to make it work with IE too (neither 7 nor 8 accept the functions). Any hints ? Thanks in advance.

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• need a project design tool

  - by santosh

  I am looking for simple and easy to use tools through which I can get project's visual picture of folder/file tree stucture , its classes, functions and objects, relations between classes and files.

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• Making a Game Without Graphics?

  - by cam

  Is it possible or even constructive to make a game without any graphics (but is intended to become graphical) I'm not good with graphics at all, so I'd like to write the skeleton for the game then have a graphics programmer/artist fill in the rest. I could write up all the major classes, and their interactions, and all the major functions/parts of the game. If so, what should I do to make it easier to integrate graphics into the game later on (every drawn object should have a Draw, Rotate, Collide, etc method) ?

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• How do you port a SqlServer database to MySQL?

  - by Lieven Cardoen

  I have a SqlServer db that I would like to port to MySQL. What's the best way to to this. Things that need to be ported are: - Tables (and data) - FileStream -- MySQL equivalent? - Stored Procedures - Functions

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• C++ priority queue structure used ?

  - by John Retallack

  While searching for some functions in C++ STL documentation I read that push and pop for priority queues needs constant time. "Constant (in the priority_queue). Although notice that push_heap operates in logarithmic time." My question is what kind of data structure is used to mantain a priority queue with O(1) for push and pop ?

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• Calendar event correct PHP script

  - by Marin

  Hello everybody! I need somebody(If you have time:) ) to help me find a good Calendar event script that functions:)Please help me.Thank you in advance:) Ps:I am looking for a complete web application which will run on a WAMP environment and has a GUI based installer or minimal command line installation requirements

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