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  • Does it should be in a namespace?

    - by Knowing me knowing you
    Do I have to put code from .cpp in a namespace from corresponding .h or it's enough to just write using declaration? //file .h namespace a { /*interface*/ class my { }; } //file .cpp using a::my; // Can I just write in this file this declaration and // after that start to write implementation, or // should I write: namespace a //everything in a namespace now { //Implementation goes here } Thanks.

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  • Cannot change font size /type in plots

    - by Sameet Nabar
    I recently had to re-install my operating system (Ubuntu). The only thing I did differently is that I installed Matlab on a separate partition, not the main Ubuntu partition. After re-installing, the fonts in my plots are no longer configurable. For example, if I ask the title font to be bold, it doesn't happen. I ran the sample code below on my computer and then on my colleague's computer and the 2 results are attached. This cannot be a problem with the code; rather in the settings of Matlab. Could somebody please tell me what settings I need to change? Thanks in advance for your help. Regards, Sameet. x1=-pi:.1:pi; x2=-pi:pi/10:pi; y1=sin(x1); y2=tan(sin(x2)) - sin(tan(x2)); [AX,H1,H2]=plotyy(x1,y1,x2,y2); xlabel ('Time (hh:mm)'); ylabel (AX(1), 'Plot1'); ylabel (AX(2), 'Plot2'); axes(AX(2)) set(H1,'linestyle','none','marker','.'); set(H2,'linestyle','none','marker','.'); title('Plot Title','FontWeight','bold'); set(gcf, 'Visible', 'off'); [legh, objh] = legend([H1 H2],'Plot1', 'Plot2','location','Best'); set(legend,'FontSize',8); print -dpng Trial.png; Bad image: http://imageshack.us/photo/my-images/708/trial1u.png/ Good image: http://imageshack.us/photo/my-images/87/trial2.png/

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  • What can be done to improve time synchronization on networks with sporadic internet access?

    - by anregen
    I'm looking for advice setting up time servers for a very non-typical network. I support many closed networks that have occasional access to the internet. A network would get access most days for a few hours, but would frequently go 1-3 weeks blacked-out. The computers/servers on this network are mostly *nix-based, but not all the same flavor. The entire network is mobile, so when it connects, it will have very different hops/latency to internet time servers. The servers on the closed network are powered-off frequently (at least daily). Right now, my gut tells me to use NTP (because I hate re-learning all the stuff that someone else already got working pretty well). But I have several issues, and am looking for someone with experience in this type of strange situation. I currently have no solution in place, I'm simply letting the internal clocks drift. This results in errors of ~600s in a majority of networks. I have seen mismatch worse than 10,000s. Is there something "better" than NTP in this situation? I know NTP likes to have very frequent, consistent access to servers that give nearly identical answers. I won't have that. How many internal NTP servers should I configure, so that during periods of internet blackout, I have internal time that is consistent within the closed network? There is no human access. No matter how large the mismatch, the server(s) must attempt to correct itself. Discrete steps are very bad. No matter how large the mismatch, the correction must be "slewed", not "stepped". I understand that this could take many hours to correct.

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  • How to approach copying objects with smart pointers as class attributes?

    - by tomislav-maric
    From the boost library documentation I read this: Conceptually, smart pointers are seen as owning the object pointed to, and thus responsible for deletion of the object when it is no longer needed. I have a very simple problem: I want to use RAII for pointer attributes of a class that is Copyable and Assignable. The copy and assignment operations should be deep: every object should have its own copy of the actual data. Also, RTTI needs to be available for the attributes (their type may also be determined at runtime). Should I be searching for an implementation of a Copyable smart pointer (the data are small, so I don't need Copy on Write pointers), or do I delegate the copy operation to the copy constructors of my objects as shown in this answer? Which smart pointer do I choose for simple RAII of a class that is copyable and assignable? (I'm thinking that the unique_ptr with delegated copy/assignment operations to the class copy constructor and assignment operator would make a proper choice, but I am not sure) Here's a pseudocode for the problem using raw pointers, it's just a problem description, not a running C++ code: // Operation interface class ModelOperation { public: virtual void operate = (); }; // Implementation of an operation called Special class SpecialModelOperation : public ModelOperation { private: // Private attributes are present here in a real implementation. public: // Implement operation void operate () {}; }; // All operations conform to ModelOperation interface // These are possible operation names: // class MoreSpecialOperation; // class DifferentOperation; // Concrete model with different operations class MyModel { private: ModelOperation* firstOperation_; ModelOperation* secondOperation_; public: MyModel() : firstOperation_(0), secondOperation_(0) { // Forgetting about run-time type definition from input files here. firstOperation_ = new MoreSpecialOperation(); secondOperation_ = new DifferentOperation(); } void operate() { firstOperation_->operate(); secondOperation_->operate(); } ~MyModel() { delete firstOperation_; firstOperation_ = 0; delete secondOperation_; secondOperation_ = 0; } }; int main() { MyModel modelOne; // Some internal scope { // I want modelTwo to have its own set of copied, not referenced // operations, and at the same time I need RAII to work for it, // as soon as it goes out of scope. MyModel modelTwo (modelOne); } return 0; }

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  • iPhone - extending a class delegate

    - by Digital Robot
    OK, I know how to create a class extension, using something like that: on .h @interface UIButton (myExtensionName) // my extended methods @end and then on .m @implementation UIButton (myExtensionName) // my implementations @end But how do I declare the extended delegates I may create? If this was a normal class I would do @protocol myExtensionName <NSObject> // my delegate declarations @end but how do I do that on a class extension? thanks

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  • Interop type cannot be embedded

    - by Jan
    I am creating an web application on the .net 4.0 framework (beta2 ) in C#. When I try to use a assembly called "ActiveHomeScriptLib", I get the following error: Interop type 'ActiveHomeScriptLib.ActiveHomeClass' cannot be embedded. Use the applicable interface instead. When I change the framework to version 3.5, I don't have any errors. What is an Interop Type and why does this only occur when I use the 4.0 framework.

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  • Web site backup in PHP?

    - by Pekka
    Does anybody know a clean PHP-based solution that can backup remote web sites using FTP? Must haves: Recursive FTP backups Possible to run through a cron job Easy to configure (easy adding of multiple sites) Local storage of backup files is sufficient Would be nice: Backed up sites are stored as zip files A nice interface to manage things Provides notification when backup has succeeded or failed Does incremental backups Does MySQL Database backups I need this to be PHP (or Perl) based because it's going to be used on shared hosting packages that do not allow usage of the standard GNU/Linux tools available.

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  • Best ways to write a method that updates two objects in a multithreaded java environment?

    - by DanielHonig
    Suppose we have a class called AccountService that manages the state of accounts. AccountService is defined as interface AccountService{ public void debit(account); public void credit(account); public void transfer(Account account, Account account1); } Given this definition, what is the best way to implement transfer() so that you can guarantee that transfer is an atomic operation. I'm interested in answers that reference Java 1.4 code as well as answers that might use resources from java.util.concurrent in Java 5

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  • how to capture the right click event using getMouse()

    - by Leyond
    I am trying to use graphics.py to write a user graphics interface. The problem is that how can I capture the right click event? It seems that the function getMouse() could just returns where the mouse was left-clicked as a Point object. from graphics import * def main(): win = GraphWin("My Circle", 100, 100) c = Circle(Point(50,50), 10) c.draw(win) win.getMouse() # pause for click in window win.close() main() I want to know how can I capture the right-click event in the window, thanks.

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  • iPhone XML SOAP requests or .NET Web Services

    - by CocoaNewBee
    I've been trying to to consume SOAP requests (.NET web services) and have found some pretty good tools that I wanted to share: 1) http://grabalife.com/2009/10/19/using-net-web-services-and-dataset-objects-in-your-iphone-app/ Really easy clean way to perform all the call needed for consuming the services. 2) http://code.google.com/p/mac-soapclient/ SOAP Client uses WSDL files you provide to dynamically create a graphical user interface for any given SOAP-based web service Hopefully that will help someone as much as me!!! Happy coding !

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  • connecting to a network using route command

    - by ami
    I have a computer with an external IP(192.168.223.220) and also an internal address (10.1.1.20) in order to connect to some servers that don't have external addresses only 10.1.1.xx . in order to connect to these servers from other machines I used the following command "route ADD 10.1.1.0 MASK 255.255.255.0 192.168.223.220" and than I was able to connect to the servers using there 10.1.1.xx address. The problem is that the hard disk of main server(192.168.223.220) died and was replaced and after the that I am not able to connect to the servers as before, the route command succeeds and I can ping 10.1.1.20 but not the other servers. Thanks I am using Windows XP and the print outs are D:\AurosHome\Scriptsipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : N100-master Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Local Area Connection 3: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Intel(R) PRO/1000 EB Network Connection with I/O Acceleration #2 Physical Address. . . . . . . . . : 00-30-48-34-BA-B9 Dhcp Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : 192.168.225.180 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.225.254 DNS Servers . . . . . . . . . . . : 192.168.225.2 Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Intel(R) PRO/1000 EB Network Connection with I/O Acceleration Physical Address. . . . . . . . . : 00-30-48-34-BA-B8 Dhcp Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : 10.1.1.20 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : Ethernet adapter Local Area Connection 2: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Mellanox IPoIB Adapter Physical Address. . . . . . . . . : 00-02-C9-25-34-0D D:\AurosHome\Scriptsroute print Interface List 0x1 ........................... MS TCP Loopback interface 0x2 ...00 30 48 34 ba b9 ...... Intel(R) PRO/1000 EB Network Connection with I/O Acceleration #2 - Packet Sche duler Miniport 0x3 ...00 30 48 34 ba b8 ...... Intel(R) PRO/1000 EB Network Connection with I/O Acceleration - Packet Schedul er Miniport 0x10005 ...00 02 c9 25 34 0d ...... Mellanox IPoIB Adapter - Packet Scheduler Miniport =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.225.254 192.168.225.180 10 10.1.1.0 255.255.255.0 10.1.1.20 10.1.1.20 10 10.1.1.20 255.255.255.255 127.0.0.1 127.0.0.1 10 10.255.255.255 255.255.255.255 10.1.1.20 10.1.1.20 10 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 192.168.225.0 255.255.255.0 192.168.225.180 192.168.225.180 10 192.168.225.180 255.255.255.255 127.0.0.1 127.0.0.1 10 192.168.225.255 255.255.255.255 192.168.225.180 192.168.225.180 10 224.0.0.0 240.0.0.0 10.1.1.20 10.1.1.20 10 224.0.0.0 240.0.0.0 192.168.225.180 192.168.225.180 10 255.255.255.255 255.255.255.255 10.1.1.20 10.1.1.20 1 255.255.255.255 255.255.255.255 10.1.1.20 10005 1 255.255.255.255 255.255.255.255 192.168.225.180 192.168.225.180 1 Default Gateway: 192.168.225.254 Persistent Routes: None

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  • what are the devises will be listed

    - by barbgal
    Hi.. please let me know what are the devices wil be listed using the below code guid = GUID_DEVINTERFACE_VOLUME; // Get device Information handle for Volume interface hDevInfo = SetupDiGetClassDevs( &guid, NULL, NULL, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT ); Thank you

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  • MSI Parameter Inspection

    - by Ben Breen
    With a windows MSI file, is there a way to grab all the possible installation parameters in .NET code? I need to make a generic user interface to configure multiple MSI files not known until run-time – then install them together in one go.

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  • Persistence scheme & state data for low memory situations (iphone)

    - by Robin Jamieson
    What happens to state information held by a class's variable after coming back from a low memory situation? I know that views will get unloaded and then reloaded later but what about some ancillary classes & data held in them that's used by the controller that launched the view? Sample scenario in question: @interface MyCustomController: UIViewController { ServiceAuthenticator *authenticator; } -(id)initWithAuthenticator:(ServiceAuthenticator *)auth; // the user may press a button that will cause the authenticator // to post some data to the service. -(IBAction)doStuffButtonPressed:(id)sender; @end @interface ServiceAuthenticator { BOOL hasValidCredentials; // YES if user's credentials have been validated NSString *username; NSString *password; // password is not stored in plain text } -(id)initWithUserCredentials:(NSString *)username password:(NSString *)aPassword; -(void)postData:(NSString *)data; @end The app delegate creates the ServiceAuthenticator class with some user data (read from plist file) and the class logs the user with the remote service. inside MyAppDelegate's applicationDidFinishLaunching: - (void)applicationDidFinishLaunching:(UIApplication *)application { ServiceAuthenticator *auth = [[ServiceAuthenticator alloc] initWithUserCredentials:username password:userPassword]; MyCustomController *controller = [[MyCustomController alloc] initWithNibName:...]; controller.authenticator = auth; // Configure and show the window [window addSubview:..]; // make everything visible [window makeKeyAndVisible]; } Then whenever the user presses a certain button, 'MyCustomController's doStuffButtonPressed' is invoked. -(IBAction)doStuffButtonPressed:(id)sender { [authenticator postData:someDataFromSender]; } The authenticator in-turn checks to if the user is logged in (BOOL variable indicates login state) and if so, exchanges data with the remote service. The ServiceAuthenticator is the kind of class that validates the user's credentials only once and all subsequent calls to the object will be to postData. Once a low memory scenario occurs and the associated nib & MyCustomController will get unloaded -- when it's reloaded, what's the process for resetting up the 'ServiceAuthenticator' class & its former state? I'm periodically persisting all of the data in my actual model classes. Should I consider also persisting the state data in these utility style classes? Is that the pattern to follow?

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  • Multiple Inheritance Debates II: according to Stroutroup

    - by asksuperuser
    I know very well about the traditional arguments about why Interface Inheritance is prefered to multiple inheritance, there has been already a post here : http://stackoverflow.com/questions/191691/should-c-include-multiple-inheritance But according to Stroutroup the real reason why Microsoft and Sun decided to get rid off multiple inheritance is that they have vested interest to do so: instead of putting features in the languages, they put in frameworks so that people then become tied to their platform instead of people having the same capability at a language standard level. What do you think ?

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  • Java Interfaces Methodology

    - by Amir Rachum
    Hi all, I've been programming in Java for a few courses in the University and I have the following question: Is it methodologically accepted that every class should implement an interface? Is it considered bad practice not to do so? Can you describe a situation where it's not a good idea to use interfaces? Thanks.

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  • NoSuchMethodErrors say the darndest things

    - by keynan21
    So, I'm working in eclipse were everything compiles and runs correctly. However, when compiling under ant for the build server, A large number of tests fail with a NoSuchMethodError saying: class A implements B interface B extends C C requires method getSyncID() // standard getter for an int field. A.java contains getSyncID() A.class contains getSyncID() and yet the Error is still thrown. Does anyone know how the hell this could happen? how to fix it.

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  • Creating a Calender in PHP

    - by Chris T
    Are there any APIs/Libraries that make it easy to generate a calender for a certain month/year? I need to have some sort of admin interface for a "event planner" part of a CMS for a local youth group and I'm at a loss as to how to generate a decent calender.

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  • Recipes/tutorials/libraries for GUI-like terminal navigation (vim/lynx-style)?

    - by qgi
    Several console based applications like vim or lynx offer a rich user interface which enables the user to navigate freely around the console, manipulate data directly on screen, access menus and much more, similar to "modern" gui applications. How is that being achieved in principal on Unix/Linux with C++? Do you directly manipulate some kind of character buffer or is the screen constantly cleared and reprinted to stdout? Is there a set of libraries to implement such behavior or even some kind of a "modern" event-driven GUI toolkit for the console?

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  • Accessing PCI Device from user space programs

    - by crissangel
    I have a device which would be interface with my processor through pcie. I have written driver for it using the existing pci file operations. Now my problem is how do I access it from user space programs? PCI File operations do not have IOCTL support and hence I cant make an ioctl call unlike other char devices. I cannot use pci_config_read_byte etc. functions as they are meant for kernel space(included in linux/pci.h).

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  • -[CCScene setOffsetx:]: unrecognized selector sent to instance

    - by Alexander Sharunov
    please help me, i'm very new in objective-c i've got 2 simplest classes (bellow first, second) i would like to set the offsetx properties of self.rolypoly object in second class like a self.rolypoly.offsetx=1 or run use [self.rolypoly setOffx]; to do somethings, but i always have the errors: trying [self.rolypoly setOffx]; in second class -[CCScene setOffx:]: unrecognized selector sent to instance 0x91d0b70' or trying self.rolypoly.offsetx=1; in second class -[CCScene setOffsetx:]: unrecognized selector sent to instance 0x808bfc0' first class //************************************************************ #import <Foundation/Foundation.h> #import "cocos2d.h" @interface RolyPoly : CCLayer { CCAction *_walkAction; CCSprite *_rolypoly; int offsetx; int offsety; } @property (nonatomic, retain) CCSprite *rolypoly; @property (nonatomic, retain) CCAction *walkAction; @property (nonatomic, assign) int offsetx; @property (nonatomic, assign) int offsety; +(id) scene; -(void) setOffx; @end //************************************************************ #import "GameLayer.h" #import "RolyPoly.h" @implementation RolyPoly @synthesize rolypoly = _rolypoly; @synthesize walkAction = _walkAction; @synthesize offsetx = _offsetx; @synthesize offsety = _offsety; +(id) scene { CCScene *scene = [CCScene node]; RolyPoly *layer = [RolyPoly node]; [scene addChild: layer]; return scene; } -(id) init { if ((self = [super init])) { [self scheduleUpdate]; } return self; } -(void) setOffx { NSLog(@"setOffx"); } -(void) update:(ccTime)delta { } - (void) dealloc { self.rolypoly = nil; self.walkAction = nil; [super dealloc]; } @end second class //************************************************************ #import <Foundation/Foundation.h> #import "cocos2d.h" #import "RolyPoly.h" @interface GameLayer : CCLayer { RolyPoly *_rolypoly; } // returns a CCScene that contains the HelloWorldLayer as the only child +(CCScene *) scene; @property (nonatomic, assign) RolyPoly * rolypoly; @end //************************************************************ #import "GameLayer.h" #import "RolyPoly.h" // HelloWorldLayer implementation @implementation GameLayer @synthesize rolypoly = _rolypoly; +(CCScene *) scene { CCScene *scene = [CCScene node]; GameLayer *layer = [GameLayer node]; [scene addChild: layer]; return scene; } -(id) init { if( (self=[super init])) { CGSize screenSize = [[CCDirector sharedDirector] winSize]; self.rolypoly = [RolyPoly scene]; [self addChild:self.rolypoly z:1]; [self.rolypoly setOffx]; [self scheduleUpdate]; } return self; } - (void)update:(ccTime)dt { } - (void) dealloc { [super dealloc]; } @end

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  • @property objective-c syntax

    - by okami
    I'm looking for the syntax of the getter/setter. Which is the setter and which is the getter?? Is the readwrite attribute the getter? Is the assign the setter? @interface SomeClass : NSObject { NSString *str; NSDate *date; } @property (readwrite, assign) NSString *str; @property (readwrite, assign) NSDate *date;

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