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  • c# Most efficient way to combine two objects

    - by Dested
    I have two objects that can be represented as an int, float, bool, or string. I need to perform an addition on these two objects with the results being the same thing c# would produce as a result. For instance 1+"Foo" would equal the string "1Foo", 2+2.5 would equal the float 5.5, and 3+3 would equal the int 6 . Currently I am using the code below but it seems like incredible overkill. Can anyone simplify or point me to some way to do this efficiently? private object Combine(object o, object o1) { float left = 0; float right = 0; bool isInt = false; string l = null; string r = null; if (o is int) { left = (int)o; isInt = true; } else if (o is float) { left = (float)o; } else if (o is bool) { l = o.ToString(); } else { l = (string)o; } if (o1 is int) { right = (int)o1; } else if (o is float) { right = (float)o1; isInt = false; } else if (o1 is bool) { r = o1.ToString(); isInt = false; } else { r = (string)o1; isInt = false; } object rr; if (l == null) { if (r == null) { rr = left + right; } else { rr = left + r; } } else { if (r == null) { rr = l + right; } else { rr = l + r; } } if (isInt) { return Convert.ToInt32(rr); } return rr; }

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  • Most efficient way to combine two objects in C#

    - by Dested
    I have two objects that can be represented as an int, float, bool, or string. I need to perform an addition on these two objects with the results being the same thing c# would produce as a result. For instance 1+"Foo" would equal the string "1Foo", 2+2.5 would equal the float 5.5, and 3+3 would equal the int 6 . Currently I am using the code below but it seems like incredible overkill. Can anyone simplify or point me to some way to do this efficiently? private object Combine(object o, object o1) { float left = 0; float right = 0; bool isInt = false; string l = null; string r = null; if (o is int) { left = (int)o; isInt = true; } else if (o is float) { left = (float)o; } else if (o is bool) { l = o.ToString(); } else { l = (string)o; } if (o1 is int) { right = (int)o1; } else if (o is float) { right = (float)o1; isInt = false; } else if (o1 is bool) { r = o1.ToString(); isInt = false; } else { r = (string)o1; isInt = false; } object rr; if (l == null) { if (r == null) { rr = left + right; } else { rr = left + r; } } else { if (r == null) { rr = l + right; } else { rr = l + r; } } if (isInt) { return Convert.ToInt32(rr); } return rr; }

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  • Optional Member Objects

    - by David Relihan
    Okay, so you have a load of methods sprinkled around your systems main class. So you do the right thing and refactor by creating a new class and perform move method(s) into a new class. The new class has a single responsibility and all is right with the world again: class Feature { public: Feature(){}; void doSomething(); void doSomething1(); void doSomething2(); }; So now your original class has a member variable of type object: Feature _feature; Which you will call in the main class. Now if you do this many times, you will have many member-objects in your main class. Now these features may or not be required based on configuration so in a way it's costly having all these objects that may or not be needed. Can anyone suggest a way of improving this? At the moment I plan to test in the newly created class if the feature is enabled - so the when a call is made to method I will return if it is not enabled. I could have a pointer to the object and then only call new if feature is enabled - but this means I will have to test before I call a method on it which would be potentially dangerous and not very readable. Would having an auto_ptr to the object improve things: auto_ptr<Feature> feature; Or am I still paying the cost of object invokation even though the object may\or may not be required. BTW - I don't think this is premeature optimisation - I just want to consider the possibilites.

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  • Moving objects colliding when using unalligned collision avoidance (steering)

    - by James Bedford
    I'm having trouble with unaligned collision avoidance for what I think is a rare case. I have set two objects to move towards each other but with a slight offset, so one of the objects is moving slightly upwards, and one of the objects is moving slightly downwards. In my unaligned collision avoidance steering algorithm I'm finding the points on the object's forward line and the other object's forward line where these two lines are the closest. If these closest points are within a collision avoidance distance, and if the distance between them is smaller than the two radii of the two object's bounding spheres, then the objects should steer away in the appropriate direction. The problem is that for my case, the closest points on the lines are calculated to be really far away from the actual collision point. This is because the two forward lines for each object are moving away from each other as the objects pass. The problem is that because of this, no steering takes place, and the two objects partially collide. Does anyone have any suggestions as to how I can correctly calculate the point of collision? Perhaps by somehow taking into account the size of the two objects?

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  • PHP memory_limit local value does not match php.ini value

    - by Buttle Butkus
    CentOS system. Summary: changed memory_limit in master and local php.ini and yet no change in the local value for a particular virtual host. Trying to improve performance, I set the memory_limit to 1024M in /etc/php.ini phpinfo() shows Master and Local values for other virtual hosts on the server as 1024M. Changing the value in /etc/php.ini changes all values, except one. One site is stuck with a local value of 256M. I thought I found the problem: there is a php.ini file (which I didn't know about) in that site's root, and it had memory_limit = 256M I changed it to 1024M. Problem solved? No. And now I don't know where to look. Obviously, I've restarted apache (/etc/init.d/httpd restart), and that usually does the trick. I also turned off APC cache, though I don't think it would cache ini files. And finally, I tried adding this to the virtual host in httpd.conf: php_value memory_limit 536870912 (yes, that would be 5 GB) And that had no effect whatsoever. What else could be the problem? Thanks.

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  • How to use the Value of a Selected Value from a DropDownList populated with AJAX/PHP

    - by mouthpiec
    Hi, I have form with two dropdownlists (lets say A and B). When I select a value from A, B is being populated accordingly using AJAX In the same page I have a button, that when pressed, posts the values of the selected items of the dropdownlists to another PHP page. The problem I am having is that the selected value of B is returned as Blank/Empty. Is there a way to store the selected value of a dropdownlist populated using AJAX? Code below: (Main FORM) <form name="NewBar" method="post" onsubmit="return validateFormOnSubmit(this)" action="AssignContactDetailToBar_f.php"> <tr> <td width="150"><b>Bar:</b></td> <td> <select name = "bar" onChange="getContact('AssignContactDetailToBar_f_getContacts.php?bar='+this.value)" size = 1 style = "width:190px"> <option value = "">---Select---</option> <?php while ($data = mysql_fetch_array($r_getBarsDetails)) { echo "<option value=\"".$data['bar_id']."\">".$data['bar_name']." (".$data['town_name'].")</option>"; } ?> </td> </tr> <tr> <td width="150"><b>Contact Person:</b></td> <td> <div id="persondiv"><select name = "person" size = 1 style = "width:190px"> <option value = "">--Select Bar--</option> </td> </tr> <tr> <td> <input name="security" type="text" size="15"> </td> <td> <input type="submit" name="Submit" value="Submit"> </td> </tr> </form> FORM to populate the 2nd Dropdownlist <select name="person" size = 1 style = "width:190px"> <option value = "">--Select Person--</option> <?php while($data=mysql_fetch_array($result)) { echo "<option value=\"".$data['person_id']."\">".$data['person_name']." ".$data['person_surname']." (".$data['town_name'].")</option>"; } ?> if you would like to see the complete code download from here

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  • How to get the value of the input element of live of Value

    - by Aruna
    HI, i am having a Input hidden element like in my JQuery i am setting the value for the above input type after some ajax call like EDIT::: $.ajax({ type: "POST", url: "http://localhost/FormBuilder/index.php/forms/saveForm/", async: false, data: "formname="+formname+"&status="+status, success: function(msg){$("#FormID").val(msg); }//success });//ajax Now somewhere in the code after this i want to fetch the value of this FIeld.How to get this value on live of value for this input type.. EDIT::: i am retriving like by var FORMID=$("#FormID").val();//but shows null How to get the value of it on live of this Input element

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  • Core Data Model Design Question - Changing "Live" Objects also Changes Saved Objects

    - by mwt
    I'm working on my first Core Data project (on iPhone) and am really liking it. Core Data is cool stuff. I am, however, running into a design difficulty that I'm not sure how to solve, although I imagine it's a fairly common situation. It concerns the data model. For the sake of clarity, I'll use an imaginary football game app as an example to illustrate my question. Say that there are NSMO's called Downs and Plays. Plays function like templates to be used by Downs. The user creates Plays (for example, Bootleg, Button Hook, Slant Route, Sweep, etc.) and fills in the various properties. Plays have a to-many relationship with Downs. For each Down, the user decides which Play to use. When the Down is executed, it uses the Play as its template. After each down is run, it is stored in history. The program remembers all the Downs ever played. So far, so good. This is all working fine. The question I have concerns what happens when the user wants to change the details of a Play. Let's say it originally involved a pass to the left, but the user now wants it to be a pass to the right. Making that change, however, not only affects all the future executions of that Play, but also changes the details of the Plays stored in history. The record of Downs gets "polluted," in effect, because the Play template has been changed. I have been rolling around several possible fixes to this situation, but I imagine the geniuses of SO know much more about how to handle this than I do. Still, the potential fixes I've come up with are: 1) "Versioning" of Plays. Each change to a Play template actually creates a new, separate Play object with the same name (as far as the user can tell). Underneath the hood, however, it is actually a different Play. This would work, AFAICT, but seems like it could potentially lead to a wild proliferation of Play objects, esp. if the user keeps switching back and forth between several versions of the same Play (creating object after object each time the user switches). Yes, the app could check for pre-existing, identical Plays, but... it just seems like a mess. 2) Have Downs, upon saving, record the details of the Play they used, but not as a Play object. This just seems ridiculous, given that the Play object is there to hold those just those details. 3) Recognize that Play objects are actually fulfilling 2 functions: one to be a template for a Down, and the other to record what template was used. These 2 functions have a different relationship with a Down. The first (template) has a to-many relationship. But the second (record) has a one-to-one relationship. This would mean creating a second object, something like "Play-Template" which would retain the to-many relationship with Downs. Play objects would get reconfigured to have a one-to-one relationship with Downs. A Down would use a Play-Template object for execution, but use the new kind of Play object to store what template was used. It is this change from a to-many relationship to a one-to-one relationship that represents the crux of the problem. Even writing this question out has helped me get clearer. I think something like solution 3 is the answer. However if anyone has a better idea or even just a confirmation that I'm on the right track, that would be helpful. (Remember, I'm not really making a football game, it's just faster/easier to use a metaphor everyone understands.) Thanks.

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  • Debugging Key-Value-Observing overflow.

    - by Paperflyer
    I wrote an audio player. Recently I started refactored some of the communication flow to make it fully MVC-compliant. Now it crashes, which in itself is not surprising. However, it crashes after a few seconds inside the Cocoa key-value-observing routines with a HUGE stack trace of recursive calls to NSKeyValueNotifyObserver. Obviously, it is recursively observing a value and thus overflowing the NSArray that holds pending notifications. According to the stack trace, the program loops from observeValueForKeyPath to setMyValue and back. Here is the according code: - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ([keyPath isEqual:@"myValue"] && object == myModel && [self myValue] != [myModel myValue]) { [self setMyValue:[myModel myValue]; } } and - (void)setMyValue:(float)value { myValue = value; [myModel setMyValue:value]; } myModel changes myValue every 0.05 seconds and if I log the calls to these two functions, they get called only every 0.05 seconds just as they should be, so this is working properly. The stack trace looks like this: -[MyDocument observeValueForKeyPath:ofObject:change:context:] NSKeyValueNotifyObserver NSKeyValueDidChange -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] -[MyDocument setMyValue:] _NSSetFloatValueAndNotify …repeated some ~8k times until crash Do you have any idea why I could still be spamming the KVO queue?

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  • C++ Pointers, objects, etc

    - by Zeee
    It may be a bit confusing, but... Let's say I have a vector type in a class to store objects, something like vector, and I have methods on my class that will later return Operators from this vector. Now if any of my methods receives an Operator, will I have any trouble to insert it directly into the vector? Or should I use the copy constructor to create a new Operator and put this new one on the vector?

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  • Passing variables to shopping cart with Javascript

    - by albatross
    This question is an extension of this one: http://stackoverflow.com/questions/2359238/calculate-order-price-by-date-selection-value I'm trying to make a conference registration page based off the previous page, which passes the variables(name, email, price) to my organization's outdated shopping cart using javascript. I'm also using Seminar Registration by CSSTricks (http://css-tricks.com/examples/SeminarRegTutorial/) Currently, my proceed to payment button produces an 'element is undefined' error on line 298(same thing on unresolved previous question, linked above^): switch (document.Information.amount.value) { Any help would be greatly appreciated. I'm at my wits end with this. Here is the page: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Seminar Registration Form with jQuery</title> <link rel="stylesheet" type="text/css" href="css/style.css" media="screen" /> <script src="js/jquery-1.2.6.js" type="text/javascript" charset="utf-8"></script> <script src="js/form-fun.jquery.js" type="text/javascript" charset="utf-8"></script> <!--[if IE]> <style type="text/css"> legend { position: relative; top: -30px; } fieldset { margin: 30px 10px 0 0; } </style> <script type="text/javascript"> $(function(){ $("#step_2 legend").css({ opacity: 0.5 }); $("#step_3 legend").css({ opacity: 0.5 }); }); </script> <![endif]--> </head> <body> <div id="page-wrap"> <h1>Conference <span>Registration</span></h1> <form action="#" method="post"> <fieldset id="step_1"> <legend>Step 1</legend> <label for="num_attendees"> How cool are you? </label> <select id="amount"> <option id="0" value="0">Please Choose</option> <option id="prof" value="90.00">Professional</option> <option id="grad" value="55.00">Graduate Student</option> </select> <br /> <div id="attendee_1_wrap" class="name_wrap push"> <h3>Who are you?</h3> <p> <label for="FirstName"> First Name: </label> <input type="text" id="FirstName" class="name_input"></input> </p> <p> <label for="LastName"> Last Name: </label> <input type="text" id="LastName" class="name_input"></input> </p> <p> <label for="OfficialTitle"> Official Title: </label> <input type="text" id="OfficialTitle" class="name_input"></input> </p> <h3>How do we find you?</h3> <label for="email">Email: </label> <input id="email" name="email" class="required email" /> </p> <p> <label for="Address">Street Address: </label><input name="Address" id="Address" type="text" size="20" maxlength="75" /> </p> <p> <label for="City">City: </label><input name="City" id="City" /> </p> <p> <label for="State">State: </label><select name="State" id="State"> <option selected value="IL">IL</option> <option value="AL">AL</option> <option value="AK">AK</option> <option value="AZ">AZ</option> <option value="AR">AR</option> <option value="CA">CA</option> <option value="CO">CO</option> <option value="CT">CT</option> <option value="DE">DE</option> <option value="DC">DC</option> <option value="FL">FL</option> <option value="GA">GA</option> <option value="HI">HI</option> <option value="ID">ID</option> <option value="IN">IN</option> <option value="IA">IA</option> <option value="KS">KS</option> <option value="KY">KY</option> <option value="LA">LA</option> <option value="ME">ME</option> <option value="MD">MD</option> <option value="MA">MA</option> <option value="MI">MI</option> <option value="MN">MN</option> <option value="MS">MS</option> <option value="MO">MO</option> <option value="MT">MT</option> <option value="NE">NE</option> <option value="NV">NV</option> <option value="NH">NH</option> <option value="NJ">NJ</option> <option value="NM">NM</option> <option value="NY">NY</option> <option value="NC">NC</option> <option value="ND">ND</option> <option value="OH">OH</option> <option value="OK">OK</option> <option value="OR">OR</option> <option value="PA">PA</option> <option value="RI">RI</option> <option value="SC">SC</option> <option value="SD">SD</option> <option value="TN">TN</option> <option value="TX">TX</option> <option value="UT">UT</option> <option value="VT">VT</option> <option value="VA">VA</option> <option value="WA">WA</option> <option value="WV">WV</option> <option value="WI">WI</option> <option value="WY">WY</option> </select> </p> <p> <label for="Zip">Zip Code: </label><input name="Zip" id="Zip" type="text" value="" size="5" maxlength="10" /> </p> <p> <label for="Phone">Telephone: </label><input name="Phone" id="Phone" type="text" value="" size="10" maxlength="13" /> </p> </div> </fieldset> <fieldset id="step_2"> <legend>Step 2</legend> <p> Do you work in Higher Education? </p> <input type="radio" id="company_name_toggle_on" name="company_name_toggle_group"></input> <label for="company_name_toggle_on">Yes</label> &emsp; <input type="radio" id="company_name_toggle_off" name="company_name_toggle_group"></input> <label for="company_name_toggle_off">No</label> <div id="company_name_wrap"> <label for="company_name"> Which School? </label> <input type="text" id="company_name"></input> </div> <div class="push"> <p> Will anyone in your group require special accommodations? </p> <input type="radio" id="special_accommodations_toggle_on" name="special_accommodations_toggle"></input> <label for="special_accommodations_toggle_on">Yes</label> &emsp; <input type="radio" id="special_accommodations_toggle_off" name="special_accommodations_toggle"></input> <label for="special_accommodations_toggle_off">No</label> </div> <div id="special_accommodations_wrap"> <label for="special_accomodations_text"> Please explain below: </label> <textarea rows="10" cols="10" id="special_accomodations_text"></textarea> </div> </fieldset> <fieldset id="step_3"> <legend>Step 3</legend> <label for="rock"> Are you ready to rock? </label> <input type="checkbox" id="rock"></input> <p> <INPUT onclick="javascript:PaymentButtonClick()" type=button value="Proceed to payment" name=PaymentButton> <img src="images/visa1.gif" /> <img src="images/mastercard1.gif" /> </p> </fieldset> </form> </div> <FORM name="emailForm" action="mailform.asp" method=post"> <INPUT type="hidden" value="Conference Registration" name="mf_subject"> <INPUT type="hidden" value="Yes" name="mf_email_results"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffa0" size="20" name="num_attendees"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffa0" size="17" name="FirstName"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffa0" size="22" name="LastName"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffff" size="64" name="OfficialTitle"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffff" size="40" name="email"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffff" size="48" name="Address"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffa0" size="17" name="City"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffa0" size="17" name="State"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffa0" size="17" name="Zip"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffa0" size="17" name="Phone"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffa0" size="17" name="company_name"> <INPUT type="hidden" title="" style="BACKGROUND-COLOR: #ffffff" size="20" name="special_accomodations_text"> <INPUT type="hidden" value="[email protected]" name="mf_from"> <INPUT type="hidden" value="[email protected]" name="mf_to"> </FORM> <FORM name="addform" action="https://webcluster.niu.edu/CreditCard/servlet/Shopping_Cart_Add_Item_Servlet" method="post"> <INPUT type="hidden" value="orient" name="Dept_ID"> <INPUT type="hidden" value="Orientation" name="Product_Name"> <INPUT type="hidden" value="z000000" name="Product_Code"> <INPUT type="hidden" value="" name="amount"> <INPUT type="hidden" value="/orientation/index.shtml" name="return_link"> <INPUT type="hidden" value="http://www.niu.edu" name="return_server"> <INPUT type="hidden" value="1" name="quantity"> <INPUT type="hidden" value="0" name="tax"> <INPUT type="hidden" value="0" name="ship"> <INPUT type="hidden" value="DQ83225" name="sale_id"> <INPUT type="hidden" value="XXXXXX" name="sale_acct"> </FORM> <SCRIPT language="Javascript"> function PaymentButtonClick() { switch (document.Information.amount.value) { case 'prof': document.Information.amount.value = 90.00; break; case 'grad': document.Information.amount.value = 55.00; break; } document.addform.Product_Name.value = document.Information.FirstName.value + ","+ document.Information.LastName.value+","+ document.Information.OfficialTitle.value+","+ document.Information.email.name+","+","+ document.Information.Address.value+ "," + document.Information.City.value+ "," + document.Information.State.value+ "," + document.Information.Zip.value+ "," + document.Information.Phone.value+ "," + document.Information.company_name.value+ "," + document.Information.special_accomodations_text.value; document.addform.Product_Code.value = document.Information.LastName.value; if ((document.Information.UCheck.checked==true) && (document.Information.altDate1.value != "") && (document.Information.altDate1.value != "x")) { if (document.Information.StudentLastName.value != "" || document.Information.StudentFirstName.value != "" || document.Information.StudentID.value != "" ) { document.addform.submit(); } else { alert("Please enter missing information"); } } } </SCRIPT> </body> </html>

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  • wpf DependencyProperty Not accepting default value for short

    - by biju
    Hi, I was trying to use tis depencency property in my code but it gives me error says that Default value type does not match type of property 'MyProperty'.But short should accept 0 as default value.Ans also if i try to give null as default value it works..even if its a non nullabel type.How come this happens.. public short MyProperty { get { return (short)GetValue(MyPropertyProperty); } set { SetValue(MyPropertyProperty, value); } } // Using a DependencyProperty as the backing store for MyProperty. This enables animation, styling, binding, etc... public static readonly DependencyProperty MyPropertyProperty = DependencyProperty.Register("MyProperty", typeof(short), typeof(Window2), new UIPropertyMetadata(0));

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  • Why do transfer objects need to implement Serializable?

    - by smaye81
    I realized today that I have blindly just followed this requirement for years without ever really asking why. Today, I ran across a NotSerializableException with a model object I created from scratch and I realized enough is enough. I was told this was because of session replication between load-balanced servers, but I know I've seen other objects at session scope that do not implement Serializable. Is this the real reason?

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  • .NET - getting form field key/value pairs?

    - by AverageJoe719
    Hi there, I've got a form with textboxes and I want to run some server side validation code on the values after the form is submitted. I was planning to grab all the textbox controls on the page and adding them to a list, then running a for each loop that says for each control in the list query the database where fieldValidation.Name = Control.Name. This would return to me an object and an associated function where i coudl then input the Control.Value and actually perform the validation. My friend told me building the list is not necessary because all languages have a way to get key/value pairs from forms (he doesn't know .NET so coudln't help me). I may be searching the wrong term here but I have not been able to find a result, or maybe I misunderstood my friend. Is there some kind of dictionary or key/value pair automatically generated upon form submissions that contains the value that was submitted and...I guess also the control? Or am I just misunderstanding him. If he was just saying populate a key/value pair based on the form submissions, how does that help me in this situation over a list that contains the control? Thanks =)

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  • Auto Generate Objects in DBIx::Class ORM in Perl

    - by Sam
    Hello, I started learning DBIx::class and I reach the point where you have to create the Objects that represents tables. Should this classes be created manually ( hard coding all the fields and relationships.....) or there is a way to generate them automatically using the database schema. I read something about loaders, but i did not know where they are really used. Please advice. Thanks

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  • JQuery returns wrong value for IE Compatibility

    - by o-logn
    Hey , I'm using JQuery and there seems to be a problem when I run IE in compatibility mode (and generally any IE less than version 8). I'm trying to use attr("value") for a button control. In IE8, and other browsers, this works fine and the result of this code: alert($(this).attr("value")); is simply the value of set in the button attribute (e.g. Home, Settings, Help etc..) However, when this is run in IE compatibility view, I get the entire HTML as the output value: <SPAN class=ui-button-text>Home</SPAN> This causes my checks to fail. Is there a way to return just the Home section across all browsers? Thanks

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  • Managing many objects at once.

    - by Jeff
    Hi, I want to find a way to efficiently keep track of a lot of objects at once. One practical example I can think of would be a particle system. How are hundreds of particles kept track of? I think I'm on the right track, I found the term 'instancing' and I also learned about flyweights. Hopefully somebody can shed some light on this and share some techniques with me. Thanks.

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  • Can a single argument constructor with a default value be subject to implicit type conversion

    - by Richard
    I understand the use of the explicit keyword to avoid the implicit type conversions that can occur with a single argument constructor, or with a constructor that has multiple arguments of which only the first does not have a default value. However, I was wondering, does a single argument constructor with a default value behave the same as one without a default value when it comes to implicit conversions?

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  • using KVO to filter an NSTableView using NSPredicate (with arrays)

    - by KingRufus
    My UI is not updating when I expect it to. The application displays "projects" using a view similar to iTunes -- a source list on the left lets you filter a list (NSTableView) on the right. My filters update properly when they are examining any simple field (like name, a string), but not for arrays (like tags). I'm removing a tag from one of my objects (from an NSMutableArray field called "tags") and I expect it to disappear from the list because it no longer matches the predicate that is bound to my table's NSArrayController. ProjectBrowser.mm: self.filter = NSPredicate* srcPredicate = [NSPredicate predicateWithFormat:@"%@ IN %K", selectedTag, @"tags"]; Project.mm: [self willChangeValueForKey:@"tags"]; [tags removeAllObjects]; [self didChangeValueForKey:@"tags"]; I've also tried this, but the result is the same: [[self mutableArrayValueForKey:@"tags"] removeAllObjects]; Interface Builder setup: a ProjectBrowser object is the XIB's File Owner an NSArrayController (Project Controller) has its Content Array bound to "File's Owner".projects Project Controller's filter predicate is bound to "File's Owner".filter NSTableView's column is bound to "Project Controller".name

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  • Hadoop: Processing large serialized objects

    - by restrictedinfinity
    I am working on development of an application to process (and merge) several large java serialized objects (size of order GBs) using Hadoop framework. Hadoop stores distributes blocks of a file on different hosts. But as deserialization will require the all the blocks to be present on single host, its gonna hit the performance drastically. How can I deal this situation where different blocks have to cant be individually processed, unlike text files ?

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  • Designing Business Objects to indicate constraints such as Max Length

    - by JR
    Is there a standard convention when designing business objects for providing consumers with a way to discover constraints such as a property's maximum length? It could be used up in the UI layer to, for example, set a Textbox's MaxLength property according to the maximum length limit back in the business object. Is there a standard design approach for this?

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  • Retrieving all objects in code upfront for performance reasons

    - by ming yeow
    How do you folks retrieve all objects in code upfront? I figure you can increase performance if you bundle all the model calls together? This makes for a bigger deal, especially if your DB cannot keep everything in memory def hitDBSeperately { get X users ...code get Y users... code get Z users... code } Versus: def hitDBInSingleCall { get X+Y+Z users code for X code for Y... }

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