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  • Are raw C++ pointers first class objects?

    - by Shailesh Kumar
    According to Wikipedia: An object is first-class when it: can be stored in variables and data structures can be passed as a parameter to a subroutine can be returned as the result of a subroutine can be constructed at runtime has intrinsic identity (independent of any given name) Somebody had once told me that raw pointers are not first class objects while smart pointers like std::auto_ptr are. But to me, a raw pointer (to an object or to a function) in C++ does seem to me to satisfy the conditions stated above to qualify as a first class object. Am I missing something?

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  • Capacity Planner errors

    - by Gabrie
    Hi Performing a discovery at customer site and although systems do get discovered, I get a lot (100000+) of these errors in the log: 02/01/2010 10:45:48:1:2200: Module = vcpDiscover Function = GetObfuscatedName Source = vcpDiscover Error = Method '~' of object '~' failed(-2147467259:0:5003251) 02/01/2010 10:45:48:1:2200: Module = vcpDiscover Function = GetObfuscatedName Source = vcpDiscover Error = Method '~' of object '~' failed(-2147467259:0:5003251) Any tips? Using latest version, just downloaded it. Gabrie

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  • StructureMap 'conditional singleton' for Lucene.Net IndexReader

    - by Gareth D
    I have a threadsafe object that is expensive to create and needs to be available through my application (a Lucene.Net IndexReader). The object can become invalid, at which point I need to recreate it (IndexReader.IsCurrent is false, need a new instance using IndexReader.Reopen). I'd like to able to use an IoC container (StructureMap) to manage the creation of the object, but I can't work out if this scenario is possible. It feels like some kind of "conditional singleton" lifecycle. Does StructureMap provide such a feature? Any alternative suggestions?

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  • Creating a function that will handle objects with common properties

    - by geocine
    Take this as an example I have trimmed this example for readability and you may not find the use of this concept here. class Teacher() { public Name {get; set;} public Salt {get; set;} public Department{get; set;} } class Student() { public Name {get; set;} public Salt {get; set;} public Section{get; set;} } public string GetEncryptedName(object Person) { //return encrypted name based on Name and Salt property return encrypt(object.Salt,object.Name) } callig the function GetEncryptedName(Teacher) GetEncryptedName(Student) How do you implement this kind of stuff?

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  • FaceBook like error

    - by user1150440
    I am using the following code in Page_Load Dim metaTagDesc As New HtmlMeta() 'Create a new instance of META tag object Dim metaTagKeywords As New HtmlMeta() Dim metaTagKeywords1 As New HtmlMeta() Dim metaTagKeywords2 As New HtmlMeta() metaTagDesc.Attributes.Add("property", "og:title") ' Add attributes to the META tag object for identification metaTagDesc.Attributes.Add("content", _table.Rows(0).Item(2)) metaTagKeywords.Attributes.Add("property", "og:type") metaTagKeywords.Attributes.Add("content", "website") metaTagKeywords1.Attributes.Add("property", "og:url") metaTagKeywords1.Attributes.Add("content", "http://citizen.tricedeals.com/Reports/" & _table.Rows(0).Item(0)) metaTagKeywords2.Attributes.Add("property", "og:image") metaTagKeywords2.Attributes.Add("content", "http://citizen.tricedeals.com/ProfilePictures/" & _table.Rows(0).Item(1) & ".jpg") Page.Header.Controls.Add(metaTagDesc) Page.Header.Controls.Add(metaTagKeywords) Page.Header.Controls.Add(metaTagKeywords1) Page.Header.Controls.Add(metaTagKeywords2) But i keep getting this error..."Your og:type object name has disallowed characters in it. It must match [a-z][a-z0-9._]*" Why?

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  • Constructor/Destructor involving a class and a struct

    - by Bogdan Maier
    I am working on a program and need to make an array of objects, specifically I have a 31x1 array where each position is an object, (each object is basically built out of 6 ints). Here is what I have but something is wrong and i could use some help thank you. 31x1 struct header" const int days=31; struct Arr{ int days; int *M; }; typedef Arr* Array; 31x1 matrix constructor: void constr(){ int *M; M = new Expe[31]; // Expe is the class class header: class Expe { private: //0-HouseKeeping, 1-Food, 2-Transport, 3-Clothing, 4-TelNet, 5-others int *obj; } Class object constructor: Expe::Expe() { this->obj=new int[6]; } help please... because i`m pretty lost.

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  • Is there a way to extend controllers in sails.js

    - by alarner
    Often times I will want to perform some action on every page of my web application or make some method available to all of my controllers. In the past with object oriented MVC frameworks I would have all of my controllers extend a root controller, placing everything I wanted done on every page in the constructor of that root controller. How would I accomplish something similar with sails.js / javascript?

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  • Delete NSManageObject at the event tableView:commiteEditingStyle:forRowAtIndexPath:

    - by David.Chu.ca
    I got exception when I tried to delete one NSManageObject at the event of tableView:commiteEditingStyle:forRowAtIndexPath:. Here is the part of my codes: - (void)tableView:(..)tableView commitEditingStyle:(..)editingStyle forRowAtIndexPath:(..)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { [managedObjectContext deleteObject: [fetchedResultController objectAtIndexPath:indexPath]]; ... } } The exception was thrown at the line of deleteObject:(method of my local NSManagedObjectContext). This is the exception message: uncaught exception 'NSObjectInaccessibleException', reason: 'The NSManagedObject with ID:0x3d07a30 <x-coredata://0D2CC9CB-042B-496D-B3FE-5F1ED64EAB97/paymentType/p2> has been invalidated.' I tried to get entity object first and then to delete it. The entity looks OK but still the exception was at delete: NSManagedObject *entityToDelete = [fetchedResultsController objectAtIndexPath:indexPath]; [mangedObjectContext deleteObject:entityToDelete]; // Exception again. I am not sure if the entity object retrieved from the fetchedResultsController(NSFetchedResultsController type) cannot be deleted? If so, is there any other way to get the entity object for deleting?

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  • iPhone objective-c autoreleasing leaking

    - by okami
    I do this: NSString *fullpath = [[NSBundle mainBundle] pathForResource:@"text_file" ofType:@"txt"]; Why the following message appear? Is my code leaking? 2010-03-31 13:44:18.649 MJIPhone[2175:207] *** _NSAutoreleaseNoPool(): Object 0x3909ba0 of class NSPathStore2 autoreleased with no pool in place - just leaking Stack: (0x1656bf 0xc80d0 0xcf2ad 0xcee0e 0xd3327 0x2482 0x2426) 2010-03-31 13:44:18.653 MJIPhone[2175:207] *** _NSAutoreleaseNoPool(): Object 0x390b0b0 of class NSPathStore2 autoreleased with no pool in place - just leaking Stack: (0x1656bf 0xc80d0 0xc7159 0xd0c6f 0xd3421 0x2482 0x2426) 2010-03-31 13:44:18.672 MJIPhone[2175:207] *** _NSAutoreleaseNoPool(): Object 0x390d140 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0x1656bf 0xc6e62 0xcec1b 0xd4386 0x24ac 0x2426)

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  • Stopping looping thread in Java

    - by halfwarp
    I'm using a thread that is continuously reading from a queue. Something like: public void run() { Object obj; while(true) { synchronized(objectsQueue) { if(objectesQueue.isEmpty()) { try { objectesQueue.wait(); } catch (InterruptedException e) { e.printStackTrace(); } obj = objectesQueue.poll(); } } // Do something with the Object obj } } What is the best way to stop this thread? I see two options: 1 - Since Thread.stop() is deprecated, I can implement a stopThisThread() method that uses a n atomic check-condition variable. 2 - Send a Death Event object or something like that to the queue. When the thread fetches a death event it exists. I prefer the 1st way, however, I don't know when to call the stopThisThread() method, as something might be on it's way to the queue and the stop signal can arrive first (not desirable). Any suggestions?

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  • Zipping only files using powershell

    - by SteB
    I'm trying to zip all the files in a single directory to a different folder as part of a simple backup routine. The code runs ok but doesn't produce a zip file: $srcdir = "H:\Backup" $filename = "test.zip" $destpath = "K:\" $zip_file = (new-object -com shell.application).namespace($destpath + "\"+ $filename) $destination = (new-object -com shell.application).namespace($destpath) $files = Get-ChildItem -Path $srcdir foreach ($file in $files) { $file.FullName; if ($file.Attributes -cne "Directory") { $destination.CopyHere($file, 0x14); } } Any ideas where I'm going wrong?

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  • What is the correct method to load an XML file and re-write it as a CVS? (C# Only)

    - by codesmack
    Hello, I have a XML file that I want to load into an unknown object type. (I say unknown object type because I am not sure what direction to go) Once I have the data loaded I need to do some processing on certain elements that are now loaded into the new object. For sake of example, we can say that the xml file is full of elements named and within the car element I need to process the element. Then once this is all done I need to write the file as a CSV file. I would like to do this is the most direct way possible. (The less code the better) I am using VS 2008 C# Thank you, CodeSmack

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  • number with sign in combobox dataprovider

    - by gauravgr8
    Hi, I am trying to display country codes(+91, +60, +01) in the combobox. Although the dataprovider(array) contains + sign but is removed. I am not getting how to show it with sign. <mx:Array id="countryArray"> <mx:Object label="India" data="+91" /> <mx:Object label="Malaysia" data="+60" /> <mx:Object label="Usa" data="+01" /> </mx:Array> Is this the problem with dataprovider? How can I treate them as text not numbers? Please help. Thanks in advance.

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  • Best way to test instance methods without running __init__

    - by KenFar
    I've got a simple class that gets most of its arguments via init, which also runs a variety of private methods that do most of the work. Output is available either through access to object variables or public methods. Here's the problem - I'd like my unittest framework to directly call the private methods called by init with different data - without going through init. What's the best way to do this? So far, I've been refactoring these classes so that init does less and data is passed in separately. This makes testing easy, but I think the usability of the class suffers a little. EDIT: Example solution based on Ignacio's answer: import types class C(object): def __init__(self, number): new_number = self._foo(number) self._bar(new_number) def _foo(self, number): return number * 2 def _bar(self, number): print number * 10 #--- normal execution - should print 160: ------- MyC = C(8) #--- testing execution - should print 80 -------- MyC = object.__new__(C) MyC._bar(8)

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  • How to change the coordinate of a point that is inside a GraphicsPath?

    - by Ben
    Is there anyway to change the coordinates of some of the points within a GraphicsPath object while leaving the other points where they are? The GraphicsPath object that gets passed into my method will contain a mixture of polygons and lines. My method would want to look something like: void UpdateGraphicsPath(GraphicsPath gPath, RectangleF regionToBeChanged, PointF delta) { // Find the points in gPath that are inside regionToBeChanged // and move them by delta. // gPath.PathPoints[i].X += delta.X; // Compiles but doesn't work } GraphicsPath.PathPoints seems to be readonly, so does GraphicsPath.PathData.Points. So I am wondering if this is even possible. Perhaps generating a new GraphicsPath object with an updated set of points? How can I know if a point is part of a line or a polygon? If anyone has any suggestions then I would be grateful.

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  • How do you determine how coarse or fine-grained a 'responsibility' should be when using the single r

    - by Mark Rogers
    In the SRP, a 'responsibility' is usually described as 'a reason to change', so that each class (or object?) should have only one reason someone should have to go in there and change it. But if you take this to the extreme fine-grain you could say that an object adding two numbers together is a responsibility and a possible reason to change. Therefore the object should contain no other logic, because it would produce another reason for change. I'm curious if there is anyone out there that has any strategies for 'scoping', the single-responsibility principle that's slightly less objective?

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  • C# memory / allocation cleanup

    - by Number8
    Some near-code to try to illustrate the question, when are objects marked as available to be garbage-collected -- class ToyBox { public List<Toy> Toys = new List<Toy>(); } class Factory { public ToyBox GetToys() { ToyBox tb = new ToyBox(); tb.Toys.Add(new Toy()); tb.Toys.Add(new Toy()); return tb; } } main() { ToyBox tb = Factory.GetToys(); // After tb is used, does all the memory get cleaned up when tb goes out of scope? } Factory.GetToys() allocates memory. When is that memory cleaned up? I assume that when Factoy.GetToys() returns the ToyBox object, the only reference to the ToyBox object is the one in main(), so when that reference goes out of scope, the Toy objects and the ToyBox object are marked for garbage collection. Is that right? Thanks for any insights...

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  • python dictionary conversion from string?

    - by shahjapan
    if I've string like "{ partner_name = test_partner}" OR " { partner_name : test_partner } its an example string will be very complex with several special characters included like =, [ , ] , { , } what will be the best way to convert it into a python object - so I can process it I tried with eval but it requires " ' " for string, but how can we add this special character \' before starting and ending of every word, I tried regular express re.findal('\w+') but it fails when my string contains ' _ ' or like characters as it will separate the string by ' _ ' Object of this question is my application needs, user friendly language as input - and I thought Json Dict will be good - but user is lazzy to put " ' " before and after of each string... then I thought for yaml but its also complex, if anybody can suggest better user friendly input which I use as python object - then please help me out.

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  • python dictionary with constant value-type

    - by s.kap
    hi there, I bumped into a case where I need a big (=huge) python dictionary, which turned to be quite memory-consuming. However, since all of the values are of a single type (long) - as well as the keys, I figured I can use python (or numpy, doesn't really matter) array for the values ; and wrap the needed interface (in: x ; out: d[x]) with an object which actually uses these arrays for the keys and values storage. I can use a index-conversion object (input -- index, of 1..n, where n is the different-values counter), and return array[index]. I can elaborate on some techniques of how to implement such an indexing-methods with reasonable memory requirement, it works and even pretty good. However, I wonder if there is such a data-structure-object already exists (in python, or wrapped to python from C/++), in any package (I checked collections, and some Google searches). Any comment will be welcome, thanks.

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  • In a binary search Tree

    - by user1044800
    In a binary search tree that takes a simple object.....when creating the getter and setter methods for the left, right, and parent. do I a do a null pointer? as in this=this or do I create the object in each method? Code bellow... This is my code: public void setParent(Person parent) { parent = new Person( parent.getName(), parent.getWeight()); //or is the parent supposed to be a null pointer ???? This is the code it came from: public void setParent(Node parent) { this.parent = parent; } Their code takes a node from the node class...my set parent is taking a person object from my person class.....

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  • SearchView - Choose between two target Activities according to the query result

    - by vitorgreati
    My application has to do the following: - if the user enters a query that matches exactly an object in my database, a Activity that shows this object should appear; - if the query doesn't match an exact object, a ArrayList with related objects will be returned and an Activity will display this list. So, as I'm using a SearchView on my ActionBar, I want to know how to open the right Activity based on the result of the query, something like this: if(objectFound) openActivityThatShowsThisObject(); else openActivityWithRelatedResults(); I saw in other question that I could use a facade Activity, but I don't know if that is a good approach. Any help will be appreciated, thanks!

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  • Java generic return tpye

    - by Colby77
    Hi, I'd like to write a method that can accept a type param (or whatever the method can figure out the type from) and return a value of this type so I don't have to cast the return type. Here is a method: public Object doIt(Object param){ if(param instanceof String){ return "string"; }else if(param instanceof Integer){ return 1; }else{ return null; } } When I call this method, and pass in it a String, even if I know the return type will be a String I have to cast the return Object. This is similar to the int param. How shall I write this method to accept a type param, and return this type?

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  • c#: sms appears to have been sent, but stuck in phone outbox

    - by I__
    i wrote code to send an SMS using my gsm phone which is attached to the computer through com port. the code is below. the problem is i do see that it is in the outbox of the phone and it actually appears to have been sent, but when i contact the recipient they say that i have not received the message. i test the phone, and i create and send a message using only the phone and it works perfectly, however when i do this with my code, it APPEARS to have been sent, and i am getting all the correct AT COMMAND responses from the phone, but the message is actually NOT sent. here is the code: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Threading; using System.IO.Ports; namespace WindowsFormsApplication1 { public partial class Form1 : Form { SerialPort serialPort1; int m_iTxtMsgState = 0; const int NUM_MESSAGE_STATES = 4; const string RESERVED_COM_1 = "COM1"; const string RESERVED_COM_4 = "COM4"; public Form1() { InitializeComponent(); this.Closing += new CancelEventHandler(Form1_Closing); } private void Form1_Load(object sender, EventArgs e) { serialPort1 = new SerialPort(GetUSBComPort()); if (serialPort1.IsOpen) { serialPort1.Close(); } serialPort1.Open(); //ThreadStart myThreadDelegate = new ThreadStart(ReceiveAndOutput); //Thread myThread = new Thread(myThreadDelegate); //myThread.Start(); this.serialPort1.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived); } private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e) { serialPort1.Close(); } private void SendLine(string sLine) { serialPort1.Write(sLine); sLine = sLine.Replace("\u001A", ""); consoleOut.Text += sLine; } public void DoWork() { ProcessMessageState(); } public void ProcessMessageState() { switch (m_iTxtMsgState) { case 0: m_iTxtMsgState = 1; SendLine("AT\r\n"); //NOTE: SendLine must be the last thing called in all of these! break; case 1: m_iTxtMsgState = 2; SendLine("AT+CMGF=1\r\n"); break; case 2: m_iTxtMsgState = 3; SendLine("AT+CMGW=" + Convert.ToChar(34) + "+9737387467" + Convert.ToChar(34) + "\r\n"); break; case 3: m_iTxtMsgState = 4; SendLine("A simple demo of SMS text messaging." + Convert.ToChar(26)); break; case 4: m_iTxtMsgState = 5; break; case 5: m_iTxtMsgState = NUM_MESSAGE_STATES; break; } } private string GetStoredSMSID() { return null; } /* //i dont think this part does anything private void serialPort1_DataReceived_1(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) { string response = serialPort1.ReadLine(); this.BeginInvoke(new MethodInvoker(() => textBox1.AppendText(response + "\r\n"))); } */ void sp_DataReceived(object sender, SerialDataReceivedEventArgs e) { try { Thread.Sleep(500); char[] msg; msg = new char[613]; int iNumToRead = serialPort1.BytesToRead; serialPort1.Read(msg, 0, iNumToRead); string response = new string(msg); this.BeginInvoke(new MethodInvoker(() => textBox1.AppendText(response + "\r\n"))); serialPort1.DiscardInBuffer(); if (m_iTxtMsgState == 4) { int pos_cmgw = response.IndexOf("+CMGW:"); string cmgw_num = response.Substring(pos_cmgw + 7, 4); SendLine("AT+CMSS=" + cmgw_num + "\r\n"); //stop listening to messages received } if (m_iTxtMsgState < NUM_MESSAGE_STATES) { ProcessMessageState(); } } catch { } } private void button1_Click(object sender, EventArgs e) { m_iTxtMsgState = 0; DoWork(); } private void button2_Click(object sender, EventArgs e) { string[] sPorts = SerialPort.GetPortNames(); foreach (string port in sPorts) { consoleOut.Text += port + "\r\n"; } } private string GetUSBComPort() { string[] sPorts = SerialPort.GetPortNames(); foreach (string port in sPorts) { if (port != RESERVED_COM_1 && port != RESERVED_COM_4) { return port; } } return null; } }

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