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  • What is an overloaded operator in c++?

    - by Jeff
    I realize this is a basic question but I have searched online, been to cplusplus.com, read through my book, and I can't seem to grasp the concept of overloaded operators. A specific example from cplusplus.com is: // vectors: overloading operators example #include <iostream> using namespace std; class CVector { public: int x,y; CVector () {}; CVector (int,int); CVector operator + (CVector); }; CVector::CVector (int a, int b) { x = a; y = b; } CVector CVector::operator+ (CVector param) { CVector temp; temp.x = x + param.x; temp.y = y + param.y; return (temp); } int main () { CVector a (3,1); CVector b (1,2); CVector c; c = a + b; cout << c.x << "," << c.y; return 0; } from http://www.cplusplus.com/doc/tutorial/classes2/ but reading through it I'm still not understanding them at all. I just need a basic example of the point of the overloaded operator (which I assume is the "CVector CVector::operator+ (CVector param)"). There's also this example from wikipedia: Time operator+(const Time& lhs, const Time& rhs) { Time temp = lhs; temp.seconds += rhs.seconds; if (temp.seconds >= 60) { temp.seconds -= 60; temp.minutes++; } temp.minutes += rhs.minutes; if (temp.minutes >= 60) { temp.minutes -= 60; temp.hours++; } temp.hours += rhs.hours; return temp; } from "http://en.wikipedia.org/wiki/Operator_overloading" The current assignment I'm working on I need to overload a ++ and a -- operator. Thanks in advance for the information and sorry about the somewhat vague question, unfortunately I'm just not sure on it at all.

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  • Java: Cannot listen to port, BindException

    - by bguiz
    Hi, I am developing an application in Netbeans, and it is using JavaDB. I can connect to it and execute queries without issues, but for some reason, the "Output - JavaDB Database Process" pane within Netbeans keeps displaying Security manager installed using the Basic server security policy. Could not listen on port 1527 on host localhost: java.net.BindException: Address already in use How do I find out what process is already using, or bound to, that port number?

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  • Control characters as delimiters

    - by Gio Borje
    I have a nodejs TCP server and a client. Basic network communication happens. Client sends "data + STX_CHARACTER + data + ETX_CHARACTER" (just an example). How do I split the string using the STX Control Character as a delimiter or how do I reference the character at all in Javascript.

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  • Lisp: Determine if a list contains a predicate

    - by justkt
    As part of a homework assignment in Lisp, I am to use apply or funcall on any predicates I find. My question (uncovered in the coursework) is: how do I know when I've found a predicate in my list of arguments? I've done some basic google searching and come up with nothing so far. We're allowed to use Lisp references for the assignment - even a pointer to a good online resource (and perhaps a specific page within one) would be great!

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  • What's the best way to mix Ruby and other languages? (Especially C++)

    - by Andy
    Hi, I'm learning Ruby, and I'm starting to play with building extensions in C. I have Programming Ruby The Pragmatic Programmers' Guide and so I can follow that for the basic nuts and bolts. What I was wondering is if there already existed some nifty frameworks/whatever to help interoperability between Ruby and other languages, with C++ being the most important for me. I've tried googling, but the results focus on language comparisons, rather than language interoperability. TIA, Andy

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  • Small Command line scripter (like Autocad commands) one line editor

    - by Objectsberg
    Basically I don't know from where to start, I need to add a line script for my application that is not so complicated, just to execute pre-defined commands, for instance: command New Invoice -- create new invoice command customer profile -- open customer form where cust id = CustID command run End-Of-Day - run the end of day process command scr 1020 -- open form id = 1020 How can I start? I have no problem of recommending any third party components (parsers,evaluators,etc..). whats missing is the basic structure no details, just a theory for implementation. Thanks, Objectberg

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  • How does the Ableton warp algorithm work exactly?

    - by pepperdreamteam
    I'm looking for any documentation or definitive information on Ableton's warp feature. I understand that it has something to do with finding transients, aligning them with an even rhythm and shifting audio samples accordingly. I'm hoping to find ways to approximate warping with more basic audio editing tools. I understand that this is ableton's unique device, really any information about how it works would be helpful. So...does anyone have any 411?

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  • Labeling a chart in VB.NET (VS 2008)

    - by typoknig
    Hi all, I have created a basic chart in VB.NET (VS 2008) and it is working good, but I would like to label the axies of the chart. The method "AxisLabel" is not what I am looking for. I want to put the word "Dollars" vertically on the far left hand side of my chart (just left of the numbers labeling the "y" axis) and the word "Months" horizontally at the bottom of the chart but above the legend (just below the numbers labeling the "x" axis). Check the picture out...

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  • Learning Javascript vs. jQuery

    - by Maen
    I got the Wrox.Beginning.JavaScript.3rd.Edition and wanted to start learning it from scratch, then my boss came along and said that why bother, learn jQuery. Can I understand jQuery and work with it although I am a newbie and have limited knowledge in ASP.net, vb.net, some C#, and basic HTML?!

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  • Reg Google app engine datastore -primarykey

    - by megala
    hi, I created table in google Big table datastore ,In that the i set primary key using @annotations as follows @Id @Column(name = "groupname") private String groupname; @Basic private String groupdesc; I worked corretly,but it override the previous record,how to solve this for eg if i entered groupname=group1 groupdesc=groupdesc than it accept after that i enter same groupname it override previous record for eg groupname=group1 groupdesc=groups this record override previous one.

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  • Catch all DOM events on a page (without Firebug et. al.)

    - by Morten Bergfall
    How would I go about creating a cross-browser script, that would intercept all events firing on a page/browser window/DOM-tree (regardless of browser)? What I'm hoping to accomplish is basically to get a better understanding of the different handling of events in different browsers; I know the basic theory, but need to see to believe...

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  • Learning to read GCC assembler output

    - by porgarmingduod
    I'm considering picking up some very rudimentary understanding of assembly. My current goal is simple: VERY BASIC understanding of GCC assembler output when compiling C/C++ with the -S switch. Just enough to do simple things such as looking at a single function and verifying whether GCC optimizes away things I expect to disappear. Does anyone have/know of a truly concise introduction to assembly, relevant to GCC and specifically for the purpose of reading, and a list of the most important instructions anyone casually reading assembly should know?

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  • In partial view: "The model item passed into the dictionary is of type"

    - by Dave
    I lack understanding of some basic MVC concepts, despite all my searching. I created an MVC project in Visual Studio, which contains the partial view _LogOnPartial.shtml. I just want to access information within the view pertaining to the user, to put in a user dropdown menu. When I try to put this at the top of the partial view cshtml page I get the above error: @model MyProject_MVC.Models.UserRepository When I try this I also get an error: @Html.Partial("_LogOnPartial", MyProject_MVC.Models.UserRepository) 'MyProject_MVC.Models.UserRepository' is a 'type', which is not valid in the given context

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  • drupal (CMS) or codeigniter (MVC) for creating a new web application?

    - by ajsie
    im going to create a new web application that is very customized. it will contain images, that are fully searchable - in a very, very customized way. when you click on the pictures you can add comments and so on. it requires users to be registered, but the registration/login process will be highly customized too. at the moment im using CodeIgniter for this. But i've read a lot of posts about CMS like Drupal and it sounds like i could let it handle basic stuff, maybe design and other front end work. i have no experience with CMS, in fact, i just started to use a MVC framework like CI and was impressed of how much easier it gets to start developing. so i wonder, if i'm going to create this kind of application, could i use drupal and then add the usual stuff, as i was going to do with CodeIgniter, like controllers, views, models, config files, my own libraries and so on? how does it work on a system like Drupal. how do you code PHP with it as with any MVC framework. it sounds like it has a lot of modules, i just wonder, if i can use it as a MVC framework but have the benefit of having all these basic stuff and design ready to use? cause then it sounds like the best "library" to provide for a web application from scratch. or is it difficult to create a customized app with it? i guess it has modules like images and users, but then how could i customize these so that every image has tags on it and country information, or have every user subscribing to changes to an image, that email will be sent to users and so on? cause i guess its easy to install a module. the question is, how do i customize it. maybe i don't need all that table columns. maybe i want to add/remove business logic. what are the pros and cons with using Drupal for this? is it even the right way to go? can you make a Stackoverflow with Drupal? Facebook? Twitter? Youtube? assuming that you know php of course. share your thoughts cause im totally new on creating a web application! thanks

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  • C++ DLL Export: Decorated/Mangled names

    - by Bob
    Created basic C++ DLL and exported names using Module Definition file (MyDLL.def). After compilation I check the exported function names using dumpbin.exe I expect to see: SomeFunction but I see this instead: SomeFunction = SomeFunction@@@23mangledstuff#@@@@ Why? The exported function appears undecorated (especially compared to not using the Module Def file), but what's up with the other stuff? If I use dumpbin.exe against a DLL from any commercial application, you get the clean: SomeFunction and nothing else......

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  • How to disable a container and its children in Swing

    - by Fuzzy76
    I cannot figure out a way to disable a container AND its children in Swing. Is Swing really missing this basic feature? If I do setEnabled(false) on a container, its children are still enabled. My GUI structure is pretty complex, and doing a traversion of all elements below the container is not an option. Neither is a GlassPane on top of the container (the container is not the entire window).

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  • xcode compile console application - c programming

    - by Alan
    Is it possible to use Xcode using iPhone 3.1.3 SDK to compile a standard C program that will work on the iphone? I'm trying to use xcode to compile a basic 'hello world' but to no avail. Do I need to obtain an additional application template or am I just missing something?

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  • Open Source Simple Speech Recognition in C++ in Windows

    - by Cenoc
    Hey Everyone, I was wondering, are there any basic speech recognition tools out there? I just want something that can distinguish the difference between "yes" and "no" and is reasonably simple to implement. Most of the stuff out there seems to make you start from scratch, and I'm looking for something more high level. Thanks!

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  • CakePHP ACO based on each entry

    - by Randuin
    I'm trying to make a blogging system but obviously certain users in certain groups should only be able to edit/delete their own posts/comments. How would I go about doing this in CakePHP? I followed the manual's basic Acl guide to setup my current Auth system.

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  • jquery javascript module architecture on a website

    - by stephan
    I want to write a module on one html site - I will never leave the site I think about two possible concurrent basic approaches: We go into the module by use only a specific function (with specific params - everything which will happen, happen there - logic, exception handling etc) We go in by using one handler-fct, which manages some kind of action & a dataArray (depending on the action also fcts will be called - but not directly maybe for exception handling) So what you prefer?!

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  • Extending AdapterView

    - by Ander Webbs
    Hi, i'm trying to make (for learning purposes) my own implementation of a simple AdapterView where items comes from an basic Adapter (ImageAdapter from sdk samples). Actual code is like this: public class MyAdapterView extends AdapterView<ImageAdapter> implements AdapterView.OnItemClickListener{ private ImageAdapter mAdapter; public MyAdapterView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initThings(); } private void initThings(){ setOnItemClickListener(this); } @Override public ImageAdapter getAdapter() { // TODO Auto-generated method stub return mAdapter; } @Override public void setAdapter(ImageAdapter adapter) { // TODO Auto-generated method stub mAdapter=adapter; requestLayout(); } View obtainView(int position) { View child = mAdapter.getView(position, null, this); return child; } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); for(int i=0;i<mAdapter.getCount();i++){ View child = obtainView(i); child.layout(10, 70*i, 70, 70); addViewInLayout(child, i, null, true); } this.invalidate(); } @Override public void onItemClick(AdapterView<?> parent, View v, int position, long id) { Log.d("MYEXAMPLES","Clicked an item!"); } } This isn't a coding masterpiece, it just displays a pseudo-listview with pictures. I know i could've used ListView, GridView, Spinner, etc. but i'm relative new to android and i'm trying to figure out some things on it. Well, the question here is: Why is my onItemClick not firing? Using the same ImageAdapter with a GridView, everything works ok, but when i use with above class, i get nothing. Inside AdapterView.java there is code for those click, longclick, etc events... so why can't i just fire them? Maybe i'm misunderstanding basic things on how AdapterView works? Should I extend other base classes instead? And why? Hoping to find more experienced guidance on here, thanks in advance.

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  • Kickstarting an Ubuntu Server 10.04 installation (DHCP fails)

    - by William
    I'm trying to automate the network installation of Ubuntu 10.04 LTS with an anaconda kickstart and everything seems to running except for the initial DHCP autoconfiguration. The installer attempts to configure the install via DHCP but fails on its first attempt. This brings me to a prompt where I can retry DHCP and it seems to always work on the second attempt. My issue is that this is not really automated if I have to hit retry for DHCP. Is there something I can add to the kickstart file so that it will automatically retry or better yet not fail the first time? Thanks. Kickstart: # System language lang en_US # Language modules to install langsupport en_US # System keyboard keyboard us # System mouse mouse # System timezone timezone America/New_York # Root password rootpw --iscrypted $1$unrsWyF2$B0W.k2h1roBSSFmUDsW0r/ # Initial user user --disabled # Reboot after installation reboot # Use text mode install text # Install OS instead of upgrade install # Use Web installation url --url=http://10.16.0.1/cobbler/ks_mirror/ubuntu-10.04-x86_64/ # System bootloader configuration bootloader --location=mbr # Clear the Master Boot Record zerombr yes # Partition clearing information clearpart --all --initlabel # Disk partitioning information part swap --size 512 part / --fstype ext3 --size 1 --grow # System authorization infomation auth --useshadow --enablemd5 %include /tmp/pre_install_ubuntu_network_config # Always install the server kernel. preseed --owner d-i base-installer/kernel/override-image string linux-server # Install the Ubuntu Server seed. preseed --owner tasksel tasksel/force-tasks string server # Firewall configuration firewall --disabled # Do not configure the X Window System skipx %pre wget "http://10.16.0.1/cblr/svc/op/trig/mode/pre/system/Test-D" -O /dev/null # Network information # Start pre_install_network_config generated code # Start of code to match cobbler system interfaces to physical interfaces by their mac addresses # Start eth0 # Configuring eth0 (00:1A:64:36:B1:C8) if ip -o link show | grep -i 00:1A:64:36:B1:C8 then IFNAME=$(ip -o link show | grep -i 00:1A:64:36:B1:C8 | cut -d" " -f2 | tr -d :) echo "network --device=$IFNAME --bootproto=dhcp" >> /tmp/pre_install_ubuntu_network_config fi # End pre_install_network_config generated code %packages openssh-server

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