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  • including a std::map within a struct? Is it ok?

    - by user553514
    class X_class{ public: struct extra {int extra1; int extra2; int extra3; }; enum a { n,m}; struct x_struct{ char b; char c; int d; int e; std::map <int, extra> myExtraMap; }; }; in my code I define : x_struct myStruct; why do I get compile errors compiling the above class? The error either says: 1) expected ; before < on the line --- where I defined the map (above) if I eliminate std:: or 2) error: invalid use of ::; error: expected ; before < token

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  • How to iterate a list inside a list in java?

    - by user2142786
    Hi i have two value object classes . package org.array; import java.util.List; public class Father { private String name; private int age ; private List<Children> Childrens; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public List<Children> getChildrens() { return Childrens; } public void setChildrens(List<Children> childrens) { Childrens = childrens; } } second is for children package org.array; public class Children { private String name; private int age ; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } } and i want to print there value i nested a list inside a list here i am putting only a single value inside the objects while in real i have many values . so i am nesting list of children inside father list. how can i print or get the value of child and father both. here is my logic. package org.array; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class ArrayDemo { public static void main(String[] args) { List <Father> fatherList = new ArrayList<Father>(); Father father = new Father(); father.setName("john"); father.setAge(25); fatherList.add(father); List <Children> childrens = new ArrayList<Children>(); Children children = new Children(); children.setName("david"); children.setAge(2); childrens.add(children); father.setChildrens(childrens); fatherList.add(father); Iterator<Father> iterator = fatherList.iterator(); while (iterator.hasNext()) { System.out.println(iterator.toString()); } } }

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  • access a property via string with array in php?

    - by sprugman
    (This is in drupal, but I don't really think that matters.) I have a big list of properties that I need to map between two objects, and in one, the value that I need to map is buried inside an array. I'm hoping to avoid hard-coding the property names in the code. If I have a class like this: class Product { public $colors, $sizes; } I can access the properties like this: $props = array('colors', 'sizes'); foreach ($props as $p) { $this->$p = $other_object->$p; } As far as I can tell, if each of the properties on the left are an array, I can't do this: foreach ($props as $p) { $this->$p[0]['value'] = $other_object->$p; } Is that correct, or am I missing some clever way around this?

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  • Using a method defined in appliciaton_controller.rb in application_controller.rb

    - by E.E.33
    I want to change my layout based on whether or not the current user is an admin. So I made a simple method to check if current user is admin, I then call that method in application controller. I keep getting the following error: undefined method `is_admin?' for ApplicationController:Class My code looks like this: class ApplicationController < ActionController::Base protect_from_forgery helper_method :current_user, :is_admin? if is_admin? layout 'admin' end ..... protected ..... def is_admin? if current_user.user_role == 'admin' return true end end end How should I be doing this? Thanks

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  • Build divs JS functions included in JS or jQuery from ajax & php data

    - by dstonek
    If a user checks a form checkbox I want to create a new div. Dynamic data is loaded from ajax and php. I am asking how to create it with JS or jQuery. A simplified version will look something like <div id="ajaxSRC1" class="CLASS"> <a href="javascript:void(0)" onmouseover="return myFunction('ajaxSRC5', 'ajaxSRC6')"> <img src="ajaxSRC2" width="ajaxSRC3" height="ajaxSRC4" alt="..." /> </a> </div>

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  • Button height rendering inconsistency in Firefox - why are input elements taller?

    - by George Edison
    Consider the following two elements: <button type="submit" class="button">Test</button> <a href="#" class="button">Test 2</a> ...which use the following style definition: .button { background-color: yellow; color: white; border: 1px solid orange; display: inline-block; font-size: 24pt; padding: 2px 16px; text-decoration: none; } This produces two buttons beside each other with an equal height in Chrome. However, Firefox renders the button on the left with a height 1px greater than the button on the right (the <a>): (I've enlarged the image above by 2x.) What do I need to do to get the two buttons to have the same height? It seems like the font-size is causing the problem - but I need that attribute. Fiddle: http://jsfiddle.net/FfRPY/

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  • Java Programming Help

    - by user215049
    hi, im a bit confused on this and i dont know how to solve this question that i have been asked, id be grateful if you could assist me on this question, maybe try to tell me what needs to be done, and how. the question is: Write a method called countChars which takes an InputStream as a parameter, reads the stream and returns the number of characters it contains as an int. Any IOExceptions which might occur in the method should be passed back to the method's caller. Note that the method header should show that it is possible that an exception might occur. i attempted this question with the following code: public class countChars { public int countChars(int InputStream) { return InputStream; } } and i get an error message saying : Main.java:26: cannot find symbol symbol : method countChars(java.io.InputStream) location: class Main s1 = "" + countChars(f1); ^ 1 error

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  • question about copy constructor

    - by lego69
    I have this class: class A { private: int player; public: A(int initPlayer = 0); A(const A&); A& operator=(const A&); ~A(); void foo() const; }; and I have function which contains this row: A *pa1 = new A(a2); can somebody please explain what exactly is going on, when I call A(a2) compiler calls copy constructor or constructor, thanks in advance

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  • jquery problem where the returned data from an XML file seems inaccessible

    - by squeaker
    Hi all, I'm using an xml file to generate some links which i would like to then be able to click on to populate an input box: $(xmlResponse).find('types').each(function(){ var id = $(this).attr('id'); var type = $(this).find('type').text(); $('<span title=\"'+type+'\" class=\"type\">'+type+'</span>').appendTo('#types'); }); $('span.type').click(function() { var title = $(this).attr('title'); $("input[name='type']").val(title); }); But for some reason clicking on the liks does not populate the input box. It does work if the span is hard coded into the page for example: <span title="text to populate" class="type">test</span> I'm guessing that the XML is not getting loaded into the DOM in the right way (or something like that) Any Ideas?

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  • Why would you use a MyObject[] internally, but expose a List<MyObject>?

    - by timmyd
    I have come across a class that has an immutable property: MyObject[] allObjs The property is initialized like this: List<MyObject> objs = createAllMyObjects(); allObjs = objs.toArray(new MyObject[objs.size()]); When it is exposed through the accessor, it's done as a List: public List<MyObject> getAllMyObjects() { return Collections.unmodifiableList(Arrays.asList(allObjs)); } Why would a programmer do this? Is there a benefit that I don't know about? Performance is not a concern, as the array of objs will only ever number in a few dozen elements. It seems that we are going round and round in circles. The class is a sort of factory, so it's got a private constructor and exposes only static methods (not sure if this could be a reason for the madness).

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  • Optimal strategy to make a C++ hash table, thread safe

    - by Ajeet
    (I am interested in design of implementation NOT a readymade construct that will do it all.) Suppose we have a class HashTable (not hash-map implemented as a tree but hash-table) and say there are eight threads. Suppose read to write ratio is about 100:1 or even better 1000:1. Case A) Only one thread is a writer and others including writer can read from HashTable(they may simply iterate over entire hash table) Case B) All threads are identical and all could read/write. Can someone suggest best strategy to make the class thread safe with following consideration 1. Top priority to least lock contention 2. Second priority to least number of locks My understanding so far is thus : One BIG reader-writer lock(semaphore). Specialize the semaphore so that there could be eight instances writer-resource for case B, where each each writer resource locks one row(or range for that matter). (so i guess 1+8 mutexes) Please let me know if I am thinking on the correct line, and how could we improve on this solution.

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  • Can I use accepts_nested_attributes_for with checkboxes in a _form to select potential 'links' from a list

    - by Ryan
    In Rails 3: I have the following models: class System has_many :input_modes # name of the table with the join in it has_many :imodes, :through => :input_modes, :source => 'mode', :class_name => "Mode" has_many :output_modes has_many :omodes, :through => :output_modes, :source => 'mode', :class_name => 'Mode' end class InputMode # OutputMode is identical belongs_to :mode belongs_to :system end class Mode ... fields, i.e. name ... end That works nicely and I can assign lists of Modes to imodes and omodes as intended. What I'd like to do is use accepts_nested_attributes_for or some other such magic in the System model and build a view with a set of checkboxes. The set of valid Modes for a given System is defined elsewhere. I'm using checkboxes in the _form view to select which of the valid modes is actually set in imodes and omodes . I don't want to create new Modes from this view, just select from a list of pre-defined Modes. Below is what I'm currently using in my _form view. It generates a list of checkboxes, one for each allowed Mode for the System being edited. If the checkbox is ticked then that Mode is to be included in the imodes list. <% @allowed_modes.each do |mode| %> <li> <%= check_box_tag :imode_ids, mode.id, @system.imodes.include?(modifier), :name => 'imode_ids[]' %> <%= mode.name %> </li> <% end %> Which passes this into the controller in params: { ..., "imode_ids"=>["2", "14"], ... } In the controller#create I extract and assign the Modes that had their corresponding checkboxes ticked and add them to imodes with the following code: @system = System.new(params[:system]) # Note the the empty list that makes sure we clear the # list if none of the checkboxes are ticked if params.has_key?(:imode_ids) imodes = Mode.find(params[:imode_ids]) else imodes = [] end @system.imodes = imodes Once again that all works nicely but I'll have to copy that cludgey code into the other methods in the controller and I'd much prefer to use something more magical if possible. I feel like I've passed off the path of nice clean rails code and into the forest of "hacking around" rails; it works but I don't like it. What should I have done?

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  • div inside a href tag

    - by kc rajput
    i want to make a div click able and inside this i have another div and this also should be click able or link. html is <a href="#"><div class="box"> <div class="plus"><img src="aaa.jpg"/></div> </div></a> css .box{ float:left; width:100px; height:100px; } .plus{ float:left; width:30px; height:30px; } can i make both divs to link and for different-different url. and is this proper way use div inside a href ?

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  • How to get suggestions in NetBeans for included files

    - by Flexx
    i have a problem to get suggestions for classes which are included in included files. E.g. content of file 'Header.php' is: //File 'Header.php': include('User.php'); //Class file When I now include the Header.php in my file 'Example.php', i do not get any suggestions: //File 'Example.php': include('Header.php'); User:: After typing User:: I exspect Methods and Vars of class User as suggestions, but there arent any. If I would include 'User.php' directly in my 'Example.php' it works, but that doesn't help me. How to solve this problem?

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  • The difference between delete and delete [] in C++

    - by Ilya Melamed
    I've written a class that contains two pointers, one is char* color_ and one in vertexesset* vertex_ where vertexesset is a class I created. In the destractor I've written at start delete [] color_; delete [] vertex_; When It came to the destructor it gave me a segmentation fault. Then I changed the destructor to: delete [] color_; delete vertex_; And now it works fine. What is the difference between the two?

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  • Data binding of itemscontrol in Silverlight 3.0

    - by jmkarthik
    I am trying to define an itemscontrol and data bind it to a List and the code is as below. XAML Item Class public class Item { public string val; } XAML.cs public MainPage() { InitializeComponent(); List<Item> items = new List<Item>(); Item item1 = new Item(); item1.val = "iasl;fdj1"; items.Add(item1); Item item2 = new Item(); item2.val = "iasfdkasdkljf2"; items.Add(item2); ic.ItemsSource = items; } The items are displayed when I run this. Am I missing something?

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  • css selector on IE

    - by user121196
    I'm using .class1.class2 .class3 selector, works fine in FF, but on IE7, it doesn't work. In the css below, the second style is always shown in IE. any solution? <STYLE type="text/css"> .test1.test2 .test3{ width:90px; height:100px; } .test4.test2 .test3{ width:900px; height:100px; } </style> <div class="test1 test2"> <button value="test" class="test3"/> </div>

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  • iOS: Releasing Object Thats In Use (ARC)

    - by RileyE
    I have an object that I have created that subscribes to some NSNotificationCenter notifications, but it is being released, since I don't have a pointer to the instantiation. The instantiation has a delegate that will call a method back to another class I have, so I felt it unnecessary to also have a pointer to it, since the pointer doesn't serve any purpose. Basically, I have an instantiation of a class, DelegateListener (name is just for example purposes), which subscribes to some of the default NSNotificationCeneter's notifications. This instantiation isn't assigned to any pointer after the instantiation ends. The instantiation, however, has a property, delegate. I assign a value to that delegate during the instantiation. That delegate implements methods that I want the DelegateListener to call when the notifications that it subscribed to fire. The problem with this is that the instantiation of DelegateListener that I create gets released, unless if I assign it to a retained pointer. Is there a way to avoid this automatic release of my DelegateListener instantiation within ARC?

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  • open multipl divs with jQuery tabs

    - by user1667419
    I want to tab on a tab and open 2 divs. Like: <div id="tabs"> <ul> <li class="tab1"><a href="#tab1">tab1</a></li> <li class="tab2"><a href="#tab2">tab2</a></li> </ul> <div id="tab1">this is tab1</div> <div id="tab2">this is tab2</div> <div id="tab3">this is tab3</div> </div> If I want to click tab1 tab, it shows both 'this is tab1' and 'this is tab3'. How can I achieve? Cheers.

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  • jQuery code .val(); not working in FF

    - by SzamDev
    Hi I have this code function calculateTotal() { var total = 0; $(".quantity").each(function() { if (!isNaN(this.value) && this.value.length != 0) { total += parseFloat(this.value); } }); $("#total_quantity").val(total); } <input onchange="calculateTotal();" name="sol1" type="text" class="result_form_textbox_small quantity" id="sol1" /> <input name="total_quantity" type="text" class="result_form_textbox_small" id="total_quantity" /> This code is working in IE very good but it's not working in FF. What is the proplem? Thanks in advance.

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  • Efficient implementation of exclusive execution

    - by n0weak
    I have an ObjectManager class that is used to process payments. It is wrapped over the Order entities, so new instance has to be created when processing is required. I need to prevent the situation when several ObjectManager instances are dealing with the same order simultaneously (it happend once because of some errors on the remote payment processing center, somehow they called our callback urls twice). I'd love to get an advice how to implement it more efficiently. For now, I am thinking about something like that: public class OrderManager{ private static final CopyOnWriteArrayList<Integer> LOCKER = new CopyOnWriteArrayList<Integer>(); private static synchronized boolean tryLock(Integer key) { return LOCKER.addIfAbsent(key); } private static void releaseLock(Integer key) { LOCKER.remove(key); } public void processPayment(Integer orderId) throws Exception{ if (!tryLock(orderId)) { return; } try { //operate } finally { releaseLock(orderId); } } //remainder omitted }

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  • Question About Classic MVC

    - by kernix
    Hello, In classic MVC the model notifies the view about changes made on it. In C# this means I have to subclass the View I'm interested in and in the subclassed class register to the model's event. For example, if I were to implement MVC using C# and Winforms, I had to subclass TextBox class and then register inside the MyTextBox's constructor for the model events. Am I correct? How was this issued in Smalltalk? Does one also need to subclass every View in order to register the model's events, or is there some way to dynamically add events to the views on the fly? Thanks

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  • c++ possible errors

    - by lego69
    hello I've got error a1 was not declared in this scope, can somebody please explain me my fault my header: #ifndef QUIZ_H_ #define QUIZ_H_ #include "quiz.cpp" class A { private: int player; public: A(int initPlayer); ~A(); void foo(); }; #endif /* QUIZ_H_ */ implementation of class functions: #include "quiz.h" #include <iostream> using std::cout; using std::endl; A::A(int initPlayer = 0){ player = initPlayer; } A::~A(){ } void A::foo(){ cout << player; } my main #include "quiz.h" int main() { quiz(7); return 0; } function quiz: #include "quiz.h" void quiz(int i) { A a1(i); a1.foo(); }

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