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• Why is my slot not being called?

  - by Jen

  I have this class: class CustomEdit : public QTextEdit { Q_GADGET public: CustomEdit(QWidget* parent); public slots: void onTextChanged (); }; CustomEdit::CustomEdit(QWidget* parent) : QTextEdit(parent) { connect( this, SIGNAL(textChanged()), this, SLOT(onTextChanged())); } void CustomEdit::onTextChanged () { // ... do stuff } The onTextChanged method is never called when I type text into the edit control. What am I missing?

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• linq selecting into custom object

  - by user276640

  what is wrong with such code public List<SearchItem> Search(string find) { return (from i in _dataContext.News where i.Text.Contains(find) select new SearchItem { ControllerAction = "test", id = i.Id.ToString(), LinkText = "test" }).ToList(); } public struct SearchItem { public string ControllerAction; public string LinkText; public string id; }

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• Zend Controller Action Helper Problem not able to add helper

  - by snakeyyy

  Trying to make a controller helper to have similar functionality in some controllers using the preDispatch method. Error: Fatal error: Class 'Helper_Action_Test' not found in /var/www/zend.dev/application/Bootstrap.php on line 9` Application layout /Application /Helpers **/Actions** this is where i will save the classes /Views /modules /configs /layouts /Bootstrap.php In the Bootstrap I have added: protected function _initActionHelpers(){ Zend_Controller_Action_HelperBroker::addHelper(new Helper_Action_Test()); } In the helper file I have: class Helper_Action_Test extends Zend_Controller_Action_Helper_Abstract{ public function preDispatch() { echo 'Test'; } } Any ideas?

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• How do I get my dependenices inject using @Configurable in conjunction with readResolve()

  - by bmatthews68

  The framework I am developing for my application relies very heavily on dynamically generated domain objects. I recently started using Spring WebFlow and now need to be able to serialize my domain objects that will be kept in flow scope. I have done a bit of research and figured out that I can use writeReplace() and readResolve(). The only catch is that I need to look-up a factory in the Spring context. I tried to use @Configurable(preConstruction = true) in conjunction with the BeanFactoryAware marker interface. But beanFactory is always null when I try to use it in my createEntity() method. Neither the default constructor nor the setBeanFactory() injector are called. Has anybody tried this or something similar? I have included relevant class below. Thanks in advance, Brian /* * Copyright 2008 Brian Thomas Matthews Limited. * All rights reserved, worldwide. * * This software and all information contained herein is the property of * Brian Thomas Matthews Limited. Any dissemination, disclosure, use, or * reproduction of this material for any reason inconsistent with the * express purpose for which it has been disclosed is strictly forbidden. */ package com.btmatthews.dmf.domain.impl.cglib; import java.io.InvalidObjectException; import java.io.ObjectStreamException; import java.io.Serializable; import java.lang.reflect.InvocationTargetException; import java.util.HashMap; import java.util.Map; import org.apache.commons.beanutils.PropertyUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.BeanFactoryAware; import org.springframework.beans.factory.annotation.Configurable; import org.springframework.util.StringUtils; import com.btmatthews.dmf.domain.IEntity; import com.btmatthews.dmf.domain.IEntityFactory; import com.btmatthews.dmf.domain.IEntityID; import com.btmatthews.dmf.spring.IEntityDefinitionBean; /** * This class represents the serialized form of a domain object implemented * using CGLib. The readResolve() method recreates the actual domain object * after it has been deserialized into Serializable. You must define * &lt;spring-configured/&gt; in the application context. * * @param <S> * The interface that defines the properties of the base domain * object. * @param <T> * The interface that defines the properties of the derived domain * object. * @author <a href="mailto:[email protected]">Brian Matthews</a> * @version 1.0 */ @Configurable(preConstruction = true) public final class SerializedCGLibEntity<S extends IEntity<S>, T extends S> implements Serializable, BeanFactoryAware { /** * Used for logging. */ private static final Logger LOG = LoggerFactory .getLogger(SerializedCGLibEntity.class); /** * The serialization version number. */ private static final long serialVersionUID = 3830830321957878319L; /** * The application context. Note this is not serialized. */ private transient BeanFactory beanFactory; /** * The domain object name. */ private String entityName; /** * The domain object identifier. */ private IEntityID<S> entityId; /** * The domain object version number. */ private long entityVersion; /** * The attributes of the domain object. */ private HashMap<?, ?> entityAttributes; /** * The default constructor. */ public SerializedCGLibEntity() { SerializedCGLibEntity.LOG .debug("Initializing with default constructor"); } /** * Initialise with the attributes to be serialised. * * @param name * The entity name. * @param id * The domain object identifier. * @param version * The entity version. * @param attributes * The entity attributes. */ public SerializedCGLibEntity(final String name, final IEntityID<S> id, final long version, final HashMap<?, ?> attributes) { SerializedCGLibEntity.LOG .debug("Initializing with parameterized constructor"); this.entityName = name; this.entityId = id; this.entityVersion = version; this.entityAttributes = attributes; } /** * Inject the bean factory. * * @param factory * The bean factory. */ public void setBeanFactory(final BeanFactory factory) { SerializedCGLibEntity.LOG.debug("Injected bean factory"); this.beanFactory = factory; } /** * Called after deserialisation. The corresponding entity factory is * retrieved from the bean application context and BeanUtils methods are * used to initialise the object. * * @return The initialised domain object. * @throws ObjectStreamException * If there was a problem creating or initialising the domain * object. */ public Object readResolve() throws ObjectStreamException { SerializedCGLibEntity.LOG.debug("Transforming deserialized object"); final T entity = this.createEntity(); entity.setId(this.entityId); try { PropertyUtils.setSimpleProperty(entity, "version", this.entityVersion); for (Map.Entry<?, ?> entry : this.entityAttributes.entrySet()) { PropertyUtils.setSimpleProperty(entity, entry.getKey() .toString(), entry.getValue()); } } catch (IllegalAccessException e) { throw new InvalidObjectException(e.getMessage()); } catch (InvocationTargetException e) { throw new InvalidObjectException(e.getMessage()); } catch (NoSuchMethodException e) { throw new InvalidObjectException(e.getMessage()); } return entity; } /** * Lookup the entity factory in the application context and create an * instance of the entity. The entity factory is located by getting the * entity definition bean and using the factory registered with it or * getting the entity factory. The name used for the definition bean lookup * is ${entityName}Definition while ${entityName} is used for the factory * lookup. * * @return The domain object instance. * @throws ObjectStreamException * If the entity definition bean or entity factory were not * available. */ @SuppressWarnings("unchecked") private T createEntity() throws ObjectStreamException { SerializedCGLibEntity.LOG.debug("Getting domain object factory"); // Try to use the entity definition bean final IEntityDefinitionBean<S, T> entityDefinition = (IEntityDefinitionBean<S, T>)this.beanFactory .getBean(StringUtils.uncapitalize(this.entityName) + "Definition", IEntityDefinitionBean.class); if (entityDefinition != null) { final IEntityFactory<S, T> entityFactory = entityDefinition .getFactory(); if (entityFactory != null) { SerializedCGLibEntity.LOG .debug("Domain object factory obtained via enity definition bean"); return entityFactory.create(); } } // Try to use the entity factory final IEntityFactory<S, T> entityFactory = (IEntityFactory<S, T>)this.beanFactory .getBean(StringUtils.uncapitalize(this.entityName) + "Factory", IEntityFactory.class); if (entityFactory != null) { SerializedCGLibEntity.LOG .debug("Domain object factory obtained via direct look-up"); return entityFactory.create(); } // Neither worked! SerializedCGLibEntity.LOG.warn("Cannot find domain object factory"); throw new InvalidObjectException( "No entity definition or factory found for " + this.entityName); } }

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• const object and const constructor

  - by Muhammad alaa

  Is there any way to know if an object is a const object or regular object, for instance consider the following class class String { String(const char* str); }; if user create a const object from String then there is no reason to copy the passed native string and that because he will not make any manipulation on it, the only thing he will do is get string size, string search and other functions that will not change the string.

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• Howto: Limit access to my facebook appliation

  - by Simon Schmincke

  Hey, I developed an application for my masters class, that I want to limit ONLY to my masters class. Can I somehow limit the access? Or even connect the limit to the users in a group? Thanks Simon

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• std::ostream interface to an OLE IStream

  - by PaulH

  I have a Visual Studio 2008 C++ application using IStreams. I would like to use the IStream connection in a std::ostream. Something like this: IStream* stream = /*create valid IStream instance...*/; IStreamBuf< WIN32_FIND_DATA > sb( stream ); std::ostream os( &sb ); WIN32_FIND_DATA d = { 0 }; // send the structure along the IStream os << d; To accomplish this, I've implemented the following code: template< class _CharT, class _Traits > inline std::basic_ostream< _CharT, _Traits >& operator<<( std::basic_ostream< _CharT, _Traits >& os, const WIN32_FIND_DATA& i ) { const _CharT* c = reinterpret_cast< const _CharT* >( &i ); const _CharT* const end = c + sizeof( WIN32_FIND_DATA ) / sizeof( _CharT ); for( c; c < end; ++c ) os << *c; return os; } template< typename T > class IStreamBuf : public std::streambuf { public: IStreamBuf( IStream* stream ) : stream_( stream ) { setp( reinterpret_cast< char* >( &buffer_ ), reinterpret_cast< char* >( &buffer_ ) + sizeof( buffer_ ) ); }; virtual ~IStreamBuf() { sync(); }; protected: traits_type::int_type FlushBuffer() { int bytes = std::min< int >( pptr() - pbase(), sizeof( buffer_ ) ); DWORD written = 0; HRESULT hr = stream_->Write( &buffer_, bytes, &written ); if( FAILED( hr ) ) { return traits_type::eof(); } pbump( -bytes ); return bytes; }; virtual int sync() { if( FlushBuffer() == traits_type::eof() ) return -1; return 0; }; traits_type::int_type overflow( traits_type::int_type ch ) { if( FlushBuffer() == traits_type::eof() ) return traits_type::eof(); if( ch != traits_type::eof() ) { *pptr() = ch; pbump( 1 ); } return ch; }; private: /// data queued up to be sent T buffer_; /// output stream IStream* stream_; }; // class IStreamBuf Yes, the code compiles and seems to work, but I've not had the pleasure of implementing a std::streambuf before. So, I'd just like to know if it's correct and complete. Thanks, PaulH

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• Go - Using a container/heap to implement a priority queue

  - by Seth Hoenig

  In the big picture, I'm trying to implement Dijkstra's algorithm using a priority queue. According to members of golang-nuts, the idiomatic way to do this in Go is to use the heap interface with a custom underlying data structure. So I have created Node.go and PQueue.go like so: //Node.go package pqueue type Node struct { row int col int myVal int sumVal int } func (n *Node) Init(r, c, mv, sv int) { n.row = r n.col = c n.myVal = mv n.sumVal = sv } func (n *Node) Equals(o *Node) bool { return n.row == o.row && n.col == o.col } And PQueue.go: // PQueue.go package pqueue import "container/vector" import "container/heap" type PQueue struct { data vector.Vector size int } func (pq *PQueue) Init() { heap.Init(pq) } func (pq *PQueue) IsEmpty() bool { return pq.size == 0 } func (pq *PQueue) Push(i interface{}) { heap.Push(pq, i) pq.size++ } func (pq *PQueue) Pop() interface{} { pq.size-- return heap.Pop(pq) } func (pq *PQueue) Len() int { return pq.size } func (pq *PQueue) Less(i, j int) bool { I := pq.data.At(i).(Node) J := pq.data.At(j).(Node) return (I.sumVal + I.myVal) < (J.sumVal + J.myVal) } func (pq *PQueue) Swap(i, j int) { temp := pq.data.At(i).(Node) pq.data.Set(i, pq.data.At(j).(Node)) pq.data.Set(j, temp) } And main.go: (the action is in SolveMatrix) // Euler 81 package main import "fmt" import "io/ioutil" import "strings" import "strconv" import "./pqueue" const MATSIZE = 5 const MATNAME = "matrix_small.txt" func main() { var matrix [MATSIZE][MATSIZE]int contents, err := ioutil.ReadFile(MATNAME) if err != nil { panic("FILE IO ERROR!") } inFileStr := string(contents) byrows := strings.Split(inFileStr, "\n", -1) for row := 0; row < MATSIZE; row++ { byrows[row] = (byrows[row])[0 : len(byrows[row])-1] bycols := strings.Split(byrows[row], ",", -1) for col := 0; col < MATSIZE; col++ { matrix[row][col], _ = strconv.Atoi(bycols[col]) } } PrintMatrix(matrix) sum, len := SolveMatrix(matrix) fmt.Printf("len: %d, sum: %d\n", len, sum) } func PrintMatrix(mat [MATSIZE][MATSIZE]int) { for r := 0; r < MATSIZE; r++ { for c := 0; c < MATSIZE; c++ { fmt.Printf("%d ", mat[r][c]) } fmt.Print("\n") } } func SolveMatrix(mat [MATSIZE][MATSIZE]int) (int, int) { var PQ pqueue.PQueue var firstNode pqueue.Node var endNode pqueue.Node msm1 := MATSIZE - 1 firstNode.Init(0, 0, mat[0][0], 0) endNode.Init(msm1, msm1, mat[msm1][msm1], 0) if PQ.IsEmpty() { // make compiler stfu about unused variable fmt.Print("empty") } PQ.Push(firstNode) // problem return 0, 0 } The problem is, upon compiling i get the error message: [~/Code/Euler/81] $ make 6g -o pqueue.6 Node.go PQueue.go 6g main.go main.go:58: implicit assignment of unexported field 'row' of pqueue.Node in function argument make: *** [all] Error 1 And commenting out the line PQ.Push(firstNode) does satisfy the compiler. But I don't understand why I'm getting the error message in the first place. Push doesn't modify the argument in any way.

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• Can extension methods be applied to interfaces?

  - by Greg

  Hi, Is it possible to apply an extension method to an interface? (C# question) That is for example to achieve the following: create an ITopology interface create an extension method for this interface (e.g. public static int CountNodes(this ITopology topologyIf) ) then when creating a class (e.g. MyGraph) which implements ITopology, then it would automatically have the Count Nodes extension. This way the classes implementing the interface would not have to have a set class name to align with what was defined in the extension method.

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• Generate java code in Eclipse?

  - by drozzy

  Does anyone know what approach one can take to automatically generate Java source code, from for example an xml or json file, in eclipse? One great example of what I am thinking of doing is what Google Android sdk does: they have an R class generated automatically from the resources. Every time a resource file is saved in Eclipse R class is automatically regenerated. Thanks!

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• how can i inherit from both QWidget and QThread?

  - by rashid

  I have a class like this class GUI : public QWidget, public QThread When I do the above i get errors about connect signals. The error says "Reference to "connect" is ambiguous". Is there a way to inherit from both? Thank you

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• adjusting table content with javascript by enumerating rows

  - by Tom

  I have a table row with 4 columns on my ecommerce site and I want to replace the content of 1st column if total amount in last column (TD class "total") is over 10 EUR. How can I do this with javascript only, I guess somehow to enumerate through the table rows and look for a correct row (one with the last column class as total) and then access the content of 1st column on this row but how?

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• change attributes of SVG graph without refresh

  - by Mike Hudak

  Hello, I have a simple SVG graph generated by GraphViz: <?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <!-- Generated by graphviz version 2.26.3 (20100126.1600) --> <!-- Title: G Pages: 1 --> <svg width="138pt" height="168pt" viewBox="0.00 0.00 138.00 168.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <g id="graph1" class="graph" transform="scale(1 1) rotate(0) translate(4 164)"> <title>G</title> <polygon fill="white" stroke="white" points="-4,5 -4,-164 135,-164 135,5 -4,5"/> <!-- Node1 --> <g id="node1" class="node"><title>Node1</title> <a xlink:href="http://localhost/viz/applet.php" xlink:title="Internet"> <image xlink:href="images/cloud.png" width="130px" height="77px" preserveAspectRatio="xMinYMin meet" x="0" y="-159.5"/> <text text-anchor="middle" x="65" y="-116.4" font-family="Times New Roman,serif" font-size="14.00">&#39;.$Internet.&#39;</text> </a> </g> <!-- Node2 --> <g id="node2" class="node"><title>Node2</title> <a xlink:href="http://localhost/viz/applet.php"> <image xlink:href="images/file server.png" width="44px" height="45px" preserveAspectRatio="xMinYMin meet" x="43" y="-45.5"/> </a> </g> <!-- Node1&#45;&gt;Node2 --> <g id="edge2" class="edge"><title>Node1&#45;&gt;Node2</title> <a xlink:title="Bandwidth: 1544kbps&#10;Using link: 12%&#10;VOIP calls: 4&#10;Packet rate: 10000&#10;Packet loss: 2"> <path fill="none" stroke="black" d="M65,-82.2678C65,-73.5404 65,-64.358 65,-55.8964"/> <polygon fill="black" stroke="black" points="68.5001,-55.6524 65,-45.6524 61.5001,-55.6525 68.5001,-55.6524"/> </a> </g> </g> </svg> I want to change some atributes: for example " VOIP calls: 4 " -changing "4" to value from Database(LDAP) without refreshing whole SVG graph <a xlink:title="Bandwidth: 1544kbps&#10;Using link: 12%&#10;VOIP calls: 4&#10;Packet rate: 10000&#10;Packet loss: 2"> Thank you for your answers

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• Map entries become vectors when piped thru a macro

  - by Gavin Grover

  In Clojure, a map entry created within a macro is preserved... (class (eval `(new clojure.lang.MapEntry :a 7))) ;=> clojure.lang.MapEntry ...but when piped thru from the outside context collapses to a vector... (class (eval `~(new clojure.lang.MapEntry :a 7))) ;=> clojure.lang.PersistentVector This behavior is defined inside LispReader.syntaxQuote(Object form) condition if(form instanceof IPersistentCollection). Does anyone know if this is intended behavior or something that will be fixed?

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• protobuf-net NOT faster than binary serialization?

  - by Ashish Gupta

  I wrote a program to serialize a 'Person' class using XMLSerializer, BinaryFormatter and ProtoBuf. I thought protobuf-net should be faster than the other two. Protobuf serialization was faster than XMLSerialization but much slower than the binary serialization. Is my understanding incorrect? Please make me understand this. Thank you for the help. Following is the output:- Person got created using protocol buffer in 347 milliseconds Person got created using XML in 1462 milliseconds Person got created using binary in 2 milliseconds Code below using System; using System.Collections.Generic; using System.Linq; using System.Text; using ProtoBuf; using System.IO; using System.Diagnostics; using System.Runtime.Serialization.Formatters.Binary; namespace ProtocolBuffers { class Program { static void Main(string[] args) { string XMLSerializedFileName = "PersonXMLSerialized.xml"; string ProtocolBufferFileName = "PersonProtocalBuffer.bin"; string BinarySerializedFileName = "PersonBinary.bin"; var person = new Person { Id = 12345, Name = "Fred", Address = new Address { Line1 = "Flat 1", Line2 = "The Meadows" } }; Stopwatch watch = Stopwatch.StartNew(); watch.Start(); using (var file = File.Create(ProtocolBufferFileName)) { Serializer.Serialize(file, person); } watch.Stop(); Console.WriteLine(watch.ElapsedMilliseconds.ToString()); Console.WriteLine("Person got created using protocol buffer in " + watch.ElapsedMilliseconds.ToString() + " milliseconds " ); watch.Reset(); watch.Start(); System.Xml.Serialization.XmlSerializer x = new System.Xml.Serialization.XmlSerializer(person.GetType()); using (TextWriter w = new StreamWriter(XMLSerializedFileName)) { x.Serialize(w, person); } watch.Stop(); Console.WriteLine(watch.ElapsedMilliseconds.ToString()); Console.WriteLine("Person got created using XML in " + watch.ElapsedMilliseconds.ToString() + " milliseconds"); watch.Reset(); watch.Start(); using (Stream stream = File.Open(BinarySerializedFileName, FileMode.Create)) { BinaryFormatter bformatter = new BinaryFormatter(); //Console.WriteLine("Writing Employee Information"); bformatter.Serialize(stream, person); } watch.Stop(); Console.WriteLine(watch.ElapsedMilliseconds.ToString()); Console.WriteLine("Person got created using binary in " + watch.ElapsedMilliseconds.ToString() + " milliseconds"); Console.ReadLine(); } } [ProtoContract] [Serializable] public class Person { [ProtoMember(1)] public int Id {get;set;} [ProtoMember(2)] public string Name { get; set; } [ProtoMember(3)] public Address Address {get;set;} } [ProtoContract] [Serializable] public class Address { [ProtoMember(1)] public string Line1 {get;set;} [ProtoMember(2)] public string Line2 {get;set;} } }

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• Is lock() type-cast safe?

  - by Andy

  public class A { } public class B:A { } void foo() { A a = new B(); B b = a as B; } for a given instance setup, will lock(a) be equivalent to lock(b) ?

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• SerialVersionUID with "private static final long" still gets InvalidClassException

  - by Buggieboy

  I have compiled and jarred the various projects in my Java application, generating serialVersionUIDs automatically through Eclipse for all my classes derived from Serializable. I read the answers to this question, and verified that serialVersionUids are all private static final long. Nevertheless, I get an error like this when I try to run: java.io.InvalidClassException: com.acme.product.Widget; local class incompatible: stream classdesc serialVersionUID = 5226096973188250357, local class serialVersionUID = -5432967318654384362 What am I missing?

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• Generic IBindingListView Implementations

  - by Brad Leach

  Can anyone suggest a good implementation of a generic collection class that implements the IBindingListView & IBindingList interfaces and provides Filtering and Searching capabilities? I see my current options as: Using a class that someone else has written and tested Inheriting from BindingList, and implementing the IBindingListView interfaces Write a custom collection from scratch, implementing IBindingListView and IBindingList. Obviously, the first option is my preferred choice. Thanking you.

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• Binary file reading problem

  - by ScReYm0

  Ok i have problem with my code for reading binary file... First i will show you my writing code: void book_saving(char *file_name, struct BOOK *current) { FILE *out; BOOK buf; out = fopen(file_name, "wb"); if(out != NULL) { printf_s("Writting to file..."); do { if(current != NULL) { strcpy(buf.catalog_number, current->catalog_number); strcpy(buf.author, current->author); buf.price = current->price; strcpy(buf.publisher, current->publisher); strcpy(buf.title, current->title); buf.price = current->year_published; fwrite(&buf, sizeof(BOOK), 1, out); } current = current->next; }while(current != NULL); printf_s("Done!\n"); fclose(out); } } and here is my "version" for reading it back: int book_open(struct BOOK *current, char *file_name) { FILE *in; BOOK buf; BOOK *vnext; int count; int i; in = fopen("west", "rb"); printf_s("Reading database from %s...", file_name); if(!in) { printf_s("\nERROR!"); return 1; } i = fread(&buf,sizeof(BOOK), 1, in); while(!feof(in)) { if(current != NULL) { current = malloc(sizeof(BOOK)); current->next = NULL; } strcpy(current->catalog_number, buf.catalog_number); strcpy(current->title, buf.title); strcpy(current->publisher, buf.publisher); current->price = buf.price; current->year_published = buf.year_published; fread(&buf, 1, sizeof(BOOK), in); while(current->next != NULL) current = current->next; fclose(in); } printf_s("Done!"); return 0; } I just need to save my linked list in binary file and to be able to read it back ... please help me. The program just don't read it or its crash every time different situation ...

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• How does .NET compiler compare two strings?

  - by Pankaj

  string a="I am comparing 2 string"; string b="I am comparing 2 string"; if(a==b) return true; else return false; How does a .NET compiler compare two strings? Does a string work like a struct(int)? string is class so a=b means we are comparing 2 object, but i want to compare 2 values.

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• ggplot geom_bar - to many bars

  - by Andreas

  I am sorry for the non-informative title. exstatus <- structure(list(org = structure(c(2L, 1L, 7L, 3L, 6L, 2L, 2L, 7L, 2L, 1L, 2L, 2L, 4L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 8L, 4L, 2L, 2L, 5L, 7L, 8L, 6L, 2L, 7L, 2L, 2L, 7L, 2L, 2L, 2L, 2L, 4L, 2L, 2L, 1L, 2L, 2L, 7L, 2L, 7L, 2L, 4L, 7L, 2L, 4L, 2L, 2L, 2L, 7L, 7L, 2L, 7L, 2L, 7L, 1L, 7L, 5L, 2L, 2L, 1L, 7L, 3L, 5L, 3L, 2L, 2L, 2L, 7L, 4L, 2L, 7L, 2L, 4L, 2L, 2L, 2L, 4L, 6L, 2L, 4L, 4L, 7L, 2L, 2L, 2L, 7L, 6L, 2L, 2L, 1L, 2L, 2L, 4L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 6L, 2L, 7L, 7L, 2L, 7L, 8L, 7L, 8L, 6L, 7L, 2L, 2L, 2L, 7L, 2L, 7L, 2L, 7L, 2L, 7L, 2L, 4L, 2L, 7L, 2L, 4L, 8L, 2L, 3L, 4L, 2L, 7L, 3L, 8L, 8L, 6L, 2L, 2L, 2L, 7L, 7L, 7L, 7L, 2L, 2L, 2L, 2L, 7L, 2L, 4L, 7L, 7L, 8L, 2L, 7L, 2L, 2L, 2L, 2L, 1L, 7L, 7L, 2L, 1L, 7L, 2L, 7L, 7L, 2L, 2L, 7L, 2L, 2L, 7L, 7L, 2L, 7L, 2L, 7L, 5L, 2L), .Label = c("gl", "il", "gm", "im", "gk", "ik", "tv", "tu"), class = "factor"), art = structure(c(2L, 1L, 3L, 1L, 2L, 2L, 2L, 3L, 2L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 3L, 2L, 2L, 2L, 1L, 3L, 3L, 2L, 2L, 3L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 2L, 2L, 3L, 2L, 3L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 2L, 3L, 2L, 3L, 1L, 3L, 1L, 2L, 2L, 1L, 3L, 1L, 1L, 1L, 2L, 2L, 2L, 3L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 1L, 2L, 2L, 2L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 2L, 2L, 3L, 3L, 2L, 3L, 3L, 3L, 3L, 2L, 3L, 2L, 2L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 2L, 2L, 3L, 2L, 2L, 3L, 2L, 1L, 2L, 2L, 3L, 1L, 3L, 3L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 3L, 3L, 3L, 2L, 3L, 2L, 2L, 2L, 2L, 1L, 3L, 3L, 2L, 1L, 3L, 2L, 3L, 3L, 2L, 2L, 3L, 2L, 2L, 3L, 3L, 2L, 3L, 2L, 3L, 1L, 2L), .Label = c("Finish", "Attending", "Something"), class = "factor"), type = structure(c(2L, 2L, 5L, 3L, 1L, 2L, 2L, 5L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 4L, 3L, 2L, 2L, 1L, 5L, 4L, 1L, 2L, 5L, 2L, 2L, 5L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 5L, 2L, 5L, 2L, 3L, 5L, 2L, 3L, 2L, 2L, 2L, 5L, 5L, 2L, 5L, 2L, 5L, 2L, 5L, 1L, 2L, 2L, 2L, 5L, 3L, 1L, 3L, 2L, 2L, 2L, 5L, 3L, 2L, 5L, 2L, 3L, 2L, 2L, 2L, 3L, 1L, 2L, 3L, 3L, 5L, 2L, 2L, 2L, 5L, 1L, 2L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 2L, 5L, 5L, 2L, 5L, 4L, 5L, 4L, 1L, 5L, 2L, 2L, 2L, 5L, 2L, 5L, 2L, 5L, 2L, 5L, 2L, 3L, 2L, 5L, 2L, 3L, 4L, 2L, 3L, 3L, 2L, 5L, 3L, 4L, 4L, 1L, 2L, 2L, 2L, 5L, 5L, 5L, 5L, 2L, 2L, 2L, 2L, 5L, 2L, 3L, 5L, 5L, 4L, 2L, 5L, 2L, 2L, 2L, 2L, 2L, 5L, 5L, 2L, 2L, 5L, 2L, 5L, 5L, 2L, 2L, 5L, 2L, 2L, 5L, 5L, 2L, 5L, 2L, 5L, 1L, 2L), .Label = c("short", "long", "between", "young", "old"), class = "factor")), .Names = c("org", "art", "type"), row.names = c(NA, -192L), class = "data.frame") and then the plot ggplot(exstatus, aes(x=type, fill=art))+ geom_bar(aes(y=..count../sum(..count..)),position="dodge") The problem is that the two rightmost bars ("young", "old") are too thick - "something" takes up the whole width - whcih is not what I intended. I am sorry that I can not explain it better.

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• Is it good practice to generally make heavyweight classes non-copyable?

  - by Emile Cormier

  I have a Shape class containing potentially many vertices, and I was contemplating making copy-constructor/copy-assignment private to prevent accidental needless copying of my heavyweight class (for example, passing by value instead of by reference). To make a copy of Shape, one would have to deliberately call a "clone" or "duplicate" method. Is this good practice? I wonder why STL containers don't use this approach, as I rarely want to pass them by value.

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• In Ruby, how does coerce() actually work?

  - by Jian Lin

  It is said that when we have a class Point and knows how to perform point * 3 like the following: class Point def initialize(x,y) @x, @y = x, y end def *(c) Point.new(@x * c, @y * c) end end point = Point.new(1,2) p point p point * 3 Output: #<Point:0x336094 @x=1, @y=2> #<Point:0x335fa4 @x=3, @y=6> but then, 3 * point is not understood: Point can't be coerced into Fixnum (TypeError) So we need to further define an instance method coerce: class Point def coerce(something) [self, something] end end p 3 * point Output: #<Point:0x3c45a88 @x=3, @y=6> So it is said that 3 * point is the same as 3.*(point) that is, the instance method * takes an argument point and invoke on the object 3. Now, since this method * doesn't know how to multiply a point, so point.coerce(3) will be called, and get back an array: [point, 3] and then * is once again applied to it, is that true? point * 3 which is the same as point.*(3) and now, this is understood and we now have a new Point object, as performed by the instance method * of the Point class. The question is: 1) who invokes point.coerce(3) ? Is it Ruby automatically, or is it some code inside of * method of Fixnum by catching an exception? Or is it by case statement that when it doesn't know one of the known types, then call coerce? 2) Does coerce always need to return an array of 2 elements? Can it be no array? Or can it be an array of 3 elements? 3) And is the rule that, the original operator (or method) * will then be invoked on element 0, with the argument of element 1? (element 0 and element 1 are the two elements in that array returned by coerce) Who does it? Is it done by Ruby or is it done by code in Fixnum? If it is done by code in Fixnum, then it is a "convention" that everybody follows when doing a coerce? So could it be the code in * of Fixnum do something like this: if (something.typeof? ...) else if ... # other type else if ... # other type else # if it is not a type I know array = something.coerce(self) return array[0].*(array[1]) end

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• Sorting a List of Strings Alphabetically In C

  - by user308583

  Basically im creating a list which contains names(strings), but as i add a struct to my list, i want to place it alphabetically. im just having trouble especially with reassigning the pointers as i add How can i do this in C? thanks.

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• Getting jQuery slideshow animation to stop on click

  - by hollyb

  I have a slide show built with jQuery that pauses on hover. It has a group of thumbnails sitting on top of the image that advances the image when clicked, otherwise the slideshow just auto-rotates through all the images. There is also a +/- to expand and contract a caption related to each image. I want to have the slideshow's automatic advancing to stop if one of the thumbnails is clicked, or the +/-. Basically, just stop whenever a user clicks anywhere within the gallery (div class=".homeImg"). I'm having a major brain fart in getting this working properly and could use some advice. Here's the jQuery: $(document).ready(function() { $(".main_image .desc").show(); //Show image info $(".main_image .block").animate({ opacity: 0.85 }, 1 ); //Set Opacity //Click and Hover events for thumbnail list $(".image_thumb ul li:first").addClass('active'); // * Adds a class 'last' to the last li to let the rotator know when to return to the first $(".image_thumb ul li:last").addClass('last'); $(".image_thumb ul li").click(function(){ //Set Variables var imgAlt = $(this).find('img').attr("alt"); //Get Alt Tag of Image var imgTitle = $(this).find('a').attr("href"); //Get Main Image URL var imgDesc = $(this).find('.block').html(); //Get HTML of block var imgDescHeight = $(".main_image").find('.block').height(); //Calculate height of block if ($(this).is(".active")) { //If it's already active, then… return false; // Don't click through } else { //Animate $(".main_image img").animate({ opacity: 0}, 800 ); $(".main_image .block").animate({ opacity: 0, marginBottom: -imgDescHeight }, 800, function() { $(".main_image .block").html(imgDesc).animate({ opacity: 0.85, marginBottom: "0" }, 250 ); $(".main_image img").attr({ src: imgTitle , alt: imgAlt}).animate({ opacity: 1}, 250 ); }); } $(".image_thumb ul li").removeClass('active'); //Remove class of 'active' on all lists $(this).addClass('active'); //add class of 'active' on this list only return false; }) .hover(function(){ $(this).addClass('hover'); }, function() { $(this).removeClass('hover'); }); //Toggle teaser $("a.collapse").click(function(){ $(".main_image .block").slideToggle(); $("a.collapse").toggleClass("show"); return false; // added to remove # browser jump }); // If we are hovering over the image area, pause the clickNext function pauseClickNext = false; $(".homeImg").hover( function () { pauseClickNext = true; }, function () { pauseClickNext = false; } ); // Define function to click the next li var clickNext = function(){ if(!pauseClickNext) { /// find the next li after .active var $next_li = $("li.active").next("li"); if($("li.active").hasClass("last") ){ $(".image_thumb ul li:first").trigger("click"); } else { $next_li.trigger("click"); } } }; // Time between image transition setInterval(clickNext, 6000); });

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