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  • c++ when to put method out side the class

    - by user63898
    i saw that some times in c++ applications using only namespace declarations with header and source file like this : #ifndef _UT_ #define _UT_ #include <string> #include <windows.h> namespace UT { void setRootPath(char* program_path, char* file_path); char * ConvertStringToCharP(std::string str); }; #endif //and then in UT.cpp #include "UT.h" namespace UT { char * ConvertStringToCharP(std::string str) { char * writable = new char[str.size() + 1]; std::copy(str.begin(), str.end(), writable); writable[str.size()] = '\0'; return writable; } void setRootPath(char* program_path, char* file_path) { //... } } is it better then defining classic class with static methods? or just simple class ? dose this method has something better for the compiler linker ? the methods in this namespace are called allot of times .

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  • C++ Add this pointer to a container by calling it in base class constructor

    - by vivekeviv
    class Base { public: Base (int a, int b); private: int a,b; }; class Derived1 { public: Derived1():base(1,2){} }; similarly Derived2, Derived 3 which doesnt contain any data members on its own Now i need to contain these derived objects in a singleton, so i was thinking to call this in base constructor like Base::Base(int a, int b) { CBaseMgr::GetInstance()->AddtoVector(this); } so now if i construct Derived d1, d2, d3 etc. will the Singleton's container contain all derived objects? My doubt is can i do this adding of objects to container in base ctor or should i do in derived ctor.?

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  • How to map a search object to a class with more fields with JPA annotations

    - by Moli
    Hi all, I'm a newbie with JPA. I need to map a search object to a table. The search object has only and id, name. The big object has more fileds id, name, adress and more. I use this as big object view plaincopy to clipboardprint? I use this as big object @Entity @Table(name="users") public class User { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; private String name; private String adress; private String keywords; } //this is my search object @XXX public class UserSearch { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; private String name; } What annotations I need to use to map the search object to the table users? I'm using spring+struts2+hibernate+JPA. Help is appreciated! Thanks!

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  • How to use a class as the base, but hide the class type publically?

    - by James
    I am currently just exposing the properties through a generic interface e.g. public interface IBaseClass { int ID { get; set; } } internal class MyBaseClass : IBaseClass { public MyBaseClass() { } public int ID { get; set; } } public class MyExposedClass : IBaseClass { private MyBaseClass _base = new MyBaseClass(); public int ID { get { return _base.ID; } set { _base.ID = value; } } } Then in my main application I can do: IBaseClass c = new MyExposedClass(); c.ID = 12345; But can't do: MyBaseClass b = new MyBaseClass(); This is my desired behaviour. However, I was just wondering if this is the correct approach? Or if there was a better way?

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  • How to get OMElement by name in mediate?

    - by luohao
    I have a response message like this: <message> <header> <TransactionID>1</TransactionID> <Timestamp>2012-05-22 10:10:36</Timestamp> <OpCode>BOSS_DELETE_USER_SME.CD</OpCode> <MsgType>RESP</MsgType> <ReturnCode>1016</ReturnCode> <ErrorMessage>uif return error message!</ErrorMessage> </header> </message> I need convert RetuenCode "1016" to "0" in extension class. How to get OMElement "ReturnCode" in mediate? My code is failed. SOAPEnvelope envelope = context.getEnvelope(); SOAPBody soapBody = envelope.getBody(); QName ReturnCode = new QName(null, "ReturnCode"); OMElement response = soapBody.getFirstChildWithName(ReturnCode);

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  • System File Checker vs Service Pack Reinstall

    - by Nixphoe
    When trying to repair slow workstations, I've found that running sfc /scannow helps quite a lot in a few of my environments running really old computers. I've also seen recommendations of reinstalling the last service pack after software installation to help keep the system stable. That makes sense as it would replace a lot of the dll files with the ones that would come with the service pack. They both seem to do the same thing, but SFC some times will ask for a disk, where the Service Pack will not. What is the main difference between the two?

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  • LVM vs RAID0 vs RAID "linear" - Combine 2 disks as one, data recovery?

    - by leto
    Hi there, given two 2TB USB external disks that have to be combined to one 4TB volume and formatted with one big Filesystem (XFS), I have a small question to ask. Does LVM provide better Data recovery, should one disk be unplugged/damaged by being able to recover the data of the still working disk or is everything lost? I would appreciate a solution where only the data of one disk is lost and I can recover the content of the other with the usual filesystem/lvm/raid tools. Is that possible with LVM or RAID "linear"? This is for storing unimportant files that can be retrieved from backup, but I want to save time :) Thank you in advance

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  • i try to combine GUI with class - no success

    - by Gold
    hi i made a class that make registration to my WinCE program. how i can from the class draw pannel + textbox, and catch the enter press from the textbox ? i try to do this: TextBox tb=new TextBox(); tb.Location=new Point(10,10); Panel pn=new Panel(); pn.Dock=DockStyle.Fill; pn.Controls.Add(tb); this.Controls.Add(pn); but i got error in: this.Controls.Add(pn); is there any simple sample code for this ? thank's in advance

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  • Ruby Koans 202: Why does the correct answer give a syntax error?

    - by hlh
    I'm working through the about_classes.rb file in the Ruby Koans, and have hit a brick wall with the "inside_a_method_self_refers_to_the_containing_object" test. Here's the code: class Dog7 attr_reader :name def initialize(initial_name) @name = initial_name end def get_self self end def to_s __ end def inspect "<Dog named '#{name}'>" end end def test_inside_a_method_self_refers_to_the_containing_object fido = Dog7.new("Fido") fidos_self = fido.get_self assert_equal <Dog named 'Fido'>, fidos_self end So, I'm trying to make the first half of the assert_equal evaluate to the second half (fidos_self). When I work it out in irb, fidos_self returns <Dog named 'Fido'>, but I keep receiving a syntax error for that answer. I've seen this similar post: Ruby Koans: Where are the quotes in this return value?, but his solution (putting fido instead of <Dog named 'Fido'>) causes my rake to abort, saying the stack level is too deep. This is driving me nuts. What am I missing here?

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  • Application.Current changes when using reflection to create an instance of another Application class

    - by markti
    Let's say I have the following Silverlight Applications: App1.xap App2.xap App3.xap Let's say that I start App1.xap as the default xap file. If I load App2.xap and App3.xap and instantiate an Application class within one of the other two XAPs. The Application.Current changes to be that new instance. System.Windows.Application obj = Activator.CreateInstance(type) as System.Windows.Application; I don't want the current application to change. I just want to get the merged Resource Dictionaries off the Application class.

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  • WPF Creating an instance of a class in xaml

    - by Cloverness
    Hi, I have a problem with creating the instance of a class in xaml file. I thought you can do it like this: in the resource part of the user control and then use it in the xaml file (for example bind to it). But even tough the class I created is located in the same namespace it says that: "The type was not found. Verfiy that all assemblies were built, etc". How to get it right? is there another method? Thanks for suggestions.

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  • USB Hub vs. Dockinstation USB vs. Laptop USB

    - by Will
    I recently had thougts about my current setup in my office, especially about the UBS ports distribution. Here's my setup: I have a Lenovo T410 docked to a Lenovo Dockingstation Series 3, that providey me with 6 USB ports, which I use all (3 ext. drives, mouse, keyboard, USB Hub of monitor). The USB hub on my ext. monitor (most probably powered by the ext. monitor's power supply) provides me with 2 USB ports, where I use one for my webcam and another for USB sticks. On my T410 itself I have 4 USB slots, that are usually not used, as don't want to mess with USB plugs when undocking my laptop, now and then I plug my printer on one of these, just because I don't have any UBS ports left. Now I'm wondering how fast each of these slots are: I assume that all the 6 USB ports from the dockinstation somehow go through the docking connector on the bottom of my laptop. Does this connector has such a big bandwidth for all these 6 USB ports to perform like if they were dedicated ports as the 4 ones on my laptop? Also how is generally the performance of USB hubs (like the one on my ext. monitor?)?

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  • Int property in class definition

    - by Daniel I-S
    I have the following class structure for custom UITableViewCells: NumericEntryCell - Contains method for controlling max value that can be entered into a textbox. SliderCell - inherits from NEC and contains methods for handling slider-control of textbox value TextOnlyCell - just contains a textbox CellA - inherits from SliderCell and has a max value of 28 CellB - inherits from TextOnlyCell and has a max value of 150. I want NumericEntryCell to contain a definition for a property that contains the maxValue. I want to be able to set a value for this in the initialize method of a child class (CellA or CellB). Currently I have an int maxValue declared in the interface of NEC. I declare a property for this with @property int maxValue and @synthesize it within the .m file. However, attempting to modify this property's value from CellA or CellB's initialize method has no effect - when I hit a breakpoint in the NEC method that uses this value, its value is always zero. How can I get this to work?

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  • More RAM vs. more servers

    - by user357972
    I was recently asked "Do you know when to decide between going for more RAM or more servers?" (in the context of scaling data mining applications). I had no idea, so what are some ways to decide? I have very little knowledge of architecture and scaling (my understanding of computer memory and what a server does is limited to the high-level basics), so tips on learning more about these things in general are also very welcome.

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  • C++ performance when accessing class members

    - by Dr. Acula
    I'm writing something performance-critical and wanted to know if it could make a difference if I use: int test( int a, int b, int c ) { // Do millions of calculations with a, b, c } or class myStorage { public: int a, b, c; }; int test( myStorage values ) { // Do millions of calculations with values.a, values.b, values.c } Does this basically result in similar code? Is there an extra overhead of accessing the class members? I'm sure that this is clear to an expert in C++ so I won't try and write an unrealistic benchmark for it right now

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  • Size of a class with 'this' pointer

    - by psvaibhav
    The size of a class with no data members is returned as 1 byte, even though there is an implicit 'this' pointer declared. Shouldn't the size returned be 4 bytes(on a 32 bit machine)? I came across articles which indicated that 'this' pointer is not counted for calculating the size of the object. But I am unable to understand the reason for this. Also, if any member function is declared virtual, the size of the class is now returned as 4 bytes. This means that the vptr is counted for calculating the size of the object. Why is the vptr considered and 'this' pointer ignored for calculating the size of object?

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  • DRY'er Object Initialization in Ruby

    - by Trevoro
    Hi, Is there a more 'DRY' way to do the following in ruby? #!/usr/bin/env ruby class Volume attr_accessor :name, :size, :type, :owner, :date_created, :date_modified, :iscsi_target, :iscsi_portal SYSTEM = 0 DATA = 1 def initialize(args={:type => SYSTEM}) @name = args[:name] @size = args[:size] @type = args[:type] @owner = args[:owner] @iscsi_target = args[:iscsi_target] @iscsi_portal = args[:iscsi_portal] end def inspect return {:name => @name, :size => @size, :type => @type, :owner => @owner, :date_created => @date_created, :date_modified => @date_modified, :iscsi_target => @iscsi_target, :iscsi_portal => @iscsi_portal } end def to_json self.inspect.to_json end end

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  • Windows 7 Upgrade vs Full Edition?

    - by Alex
    My dad already has a copy of Win 7 Pro (full). If I buy the upgrade edition of Win 7 Pro (student discount), could I use the full disk to install, then enter the new, upgrade key code to activate it? I can't seem to get a student discount for the full version.

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  • SSD: NTFS vs EXT4

    - by Joshua
    Always when I read about SSD usage under Linux, the advice is to disable journalling in Ext4 (or use Ext2), since it's too bad for your SSD. But in all articles about SSD tweaks for Windows, I never see any mentions that you should disable NTFS journalling, or that you should stick to FAT32. I know Ext4's journaling is more advanced, but is it so much more damaging to a SSD than that of NTFS? Or are Linux users just a little bit more cautious?

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  • Class views in Django

    - by Sebastjan Trepca
    Django view points to a function, which can be a problem if you want to change only a bit of functionality. Yes, I could have million keyword arguments and even more if statements in the function, but I was thinking more of an object oriented approach. For example, I have a page that displays a user. This page is very similar to page that displays a group, but it's still not so similar to just use another data model. Group also has members etc... One way would be to point views to class methods and then extend that class. Has anyone tried this approach or has any other idea?

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  • How to order my objects in a C++ class correctly

    - by Julen
    Hello, I have been coding regurlarly in C++ in the past months. I am getting used to it step by step... but there are things that confuse me about formatting. I know there is a lot of legacy from C that I supousee mixes with C++. This time I have doubts about how to order properly my members and functions within in a class. Also considering their access modifiers. How is the convention in this? Until know I am doing everything "public" and writing first constructor of class, then destructor, next members and finally functions. It this correct? What happens when introducing "private" and "protected" access modifiers or "virtual" functions? From the documents I have look in the Internet there is different ways of doing things. But my questions aims to get the knowledge from a community that develops in C++ that I want to blend into. ;-) Thanks a lot!!!

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  • HAProxy appsession vs cookie precedence

    - by user1139473
    I am trying to find the best solution for balancing and keeping persistence on our application behind HAProxy. Here is our basic configuration: https://gist.github.com/endzyme/1804046b23c37beba520 After playing around with taking members down and up and also reloading the haproxy (with -sf) I have noticed that appsession isn't 100% effective, it would appear that sometimes it doesn't always 'request-learn'. I also tried to add a cookie JSESSION prefix to balance in case request-learn didn't take. Unfortunately it would present scenarios where the prefix would list svr2 but it was balanced to a different server. I am assuming it's because the appsession table takes first then sticks on that before using the cookie parameter. I have not tested with using cookie as an inserted option (not prefix on existing cookie) but I am thinking it would yield similar results. My question is: Which one is checked first, appsession or cookie, and is it an immediate catch after it reads the first one, or a fall through? Also as a follow up - is it not recommended to use both in the same backend? Cookie as I understand takes less memory resources, is agnostic to reloads and has way better reliability of persistence. Appsession I assume takes less cpu resource, since it's reading not writing. (Bonus Question: is there a way to inspect appsession/cookie table map? socket show table doesn't show anything except stick-tables) Many thanks in advance, -Nick

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  • Push a detail view in UITableViewCell class

    - by luca
    My class inherit from UITableViewCell, i have make some custom transitions to push a new detail view when an image get selected. [UIView transitionWithView:self.masterView duration:0.5 options:UIViewAnimationOptionShowHideTransitionViews animations:^ { [self.masterView addSubview:self.detailImage]; } completion:nil]; My code works fine, the detailImage subview is shown with a transition, but this transition is not what i want exactly. What i want to perform is a simple transition from bottom to up. The list of UIViewAnimation doesn't contain such animation. Is there any way to use that transition without changing my class inheritance to UINavigationController ?

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  • Call function from object instantiated in one class in another

    - by Dk43
    I have two classes, both of which need to be able to call the same instance of entitymanager class Engine { EntityManager::Entitymanager EManager; } And I need to add an object to a vector contained by this particular instance of Engine. What I want to do is be able to add a bullet spawned by the player to the vector that contains all my entities. class Player : Entity { void SpawnBullet() {Engine::EManager.Add(BULLET);} } The above returns this error: error: object missing in reference to ‘Engine::EManager’ How do I resolve this? Any help or pointers in the right direction would be much appreciated!

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