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C++ Storing variables and inheritance

- by Kaa

Hello Everyone, Here is my situation: I have an event driven system, where all my handlers are derived from IHandler class, and implement an onEvent(const Event &event) method. Now, Event is a base class for all events and contains only the enumerated event type. All actual events are derived from it, including the EventKey event, which has 2 fields: (uchar) keyCode and (bool)isDown. Here's the interesting part: I generate an EventKey event using the following syntax: Event evt = EventKey(15, true); and I ship it to the handlers: EventDispatch::sendEvent(evt); // void EventDispatch::sendEvent(const Event &event); (EventDispatch contains a linked list of IHandlers and calls their onEvent(const Event &event) method with the parameter containing the sent event. Now the actual question: Say I want my handlers to poll the events in a queue of type Event, how do I do that? x Dynamic pointers with reference counting sound like too big of a solution. x Making copies is more difficult than it sounds, since I'm only receiving a reference to a base type, therefore each time I would need to check the type of event, upcast to EventKey and then make a copy to store in a queue. Sounds like the only solution - but is unpleasant since I would need to know every single type of event and would have to check that for every event received - sounds like a bad plan. x I could allocate the events dynamically and then send around pointers to those events, enqueue them in the array if wanted - but other than having reference counting - how would I be able to keep track of that memory? Do you know any way to implement a very light reference counter that wouldn't interfere with the user? What do you think would be a good solution to this design? I thank everyone in advance for your time. Sincerely, Kaa

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Insert Query for table

- by shanks

How to add data from one table to another table with new data in sql

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Can we solve the table row background image problem, in chrome, in multi celled tables??

- by Ya'el

It is frequently asked – but I haven’t seen a good answer yet (and I looked). If you set a background image in CSS to a table row- the image will repeat itself in every cell. If you set the position: relative (for the row) and set the background-image: none (for the cells) it solves the problem on IE but not on chrome! I can't use background positioning since there are many calls and their size varies. (And the picture is not symmetrical- It's a fade out from one side. Anybody?? Example for the css code : tr { height: 30px; position:relative;} tr.green {background: url('green_30.png') no-repeat left top;} tr.orange {background: url('oranger_30.png') no-repeat left top;} tr.red {background: url('red_30.png') no-repeat left top;} td {background-image:none;} The HTML is basic - A multi cell table. The goal is to have different colors fade into every row, but it could be any non-pattern image.

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Can I change properties of inherited controls at design time?

- by Jeff Stock

I am using visual inheritance and was wondering if there is a way to change the properties of inherited controls at design time, preferably in the form designer. If not, then in the designer code. I have my control declared as Public in the base class. I can access it in the child form code, but not in the form designer. Is this just not possible?

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Using list() to extract a data.table inside of a function

- by Nathan VanHoudnos

I must admit that the data.table J syntax confuses me. I am attempting to use list() to extract a subset of a data.table as a data.table object as described in Section 1.4 of the data.table FAQ, but I can't get this behavior to work inside of a function. An example: require(data.table) ## Setup some test data set.seed(1) test.data <- data.table( X = rnorm(10), Y = rnorm(10), Z = rnorm(10) ) setkey(test.data, X) ## Notice that I can subset the data table easily with literal names test.data[, list(X,Y)] ## X Y ## 1: -0.8356286 -0.62124058 ## 2: -0.8204684 -0.04493361 ## 3: -0.6264538 1.51178117 ## 4: -0.3053884 0.59390132 ## 5: 0.1836433 0.38984324 ## 6: 0.3295078 1.12493092 ## 7: 0.4874291 -0.01619026 ## 8: 0.5757814 0.82122120 ## 9: 0.7383247 0.94383621 ## 10: 1.5952808 -2.21469989 I can even write a function that will return a column of the data.table as a vector when passed the name of a column as a character vector: get.a.vector <- function( my.dt, my.column ) { ## Step 1: Convert my.column to an expression column.exp <- parse(text=my.column) ## Step 2: Return the vector return( my.dt[, eval(column.exp)] ) } get.a.vector( test.data, 'X') ## [1] -0.8356286 -0.8204684 -0.6264538 -0.3053884 0.1836433 0.3295078 ## [7] 0.4874291 0.5757814 0.7383247 1.5952808 But I cannot pull a similar trick for list(). The inline comments are the output from the interactive browser() session. get.a.dt <- function( my.dt, my.column ) { ## Step 1: Convert my.column to an expression column.exp <- parse(text=my.column) ## Step 2: Enter the browser to play around browser() ## Step 3: Verity that a literal X works: my.dt[, list(X)] ## << not shown >> ## Step 4: Attempt to evaluate the parsed experssion my.dt[, list( eval(column.exp)] ## Error in `rownames<-`(`*tmp*`, value = paste(format(rn, right = TRUE), (from data.table.example.R@1032mCJ#7) : ## length of 'dimnames' [1] not equal to array extent return( my.dt[, list(eval(column.exp))] ) } get.a.dt( test.data, "X" ) What am I missing? Update: Due to some confusion as to why I would want to do this I wanted to clarify. My use case is when I need to access a data.table column when when I generate the name. Something like this: set.seed(2) test.data[, X.1 := rnorm(10)] which.column <- 'X' new.column <- paste(which.column, '.1', sep="") get.a.dt( test.data, new.column ) Hopefully that helps.

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HTML Email template Table help needed

- by user1870691

I need help setting up an email newsletter template as one of the columns is not being displayed properly, the column containing heading 2 is not being displayed properly it is being displayed towards right side of the page instead of aligning with the template elements. Here is the code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> </head> <body>                                         <table border="0" align="center" cellpadding="0" cellspacing="0" class="cont-bg" bgcolor="#f1f1f1" style="background-color: #f1f1f1; padding: 27px 0px 0px; width: 100%; background-position: initial initial; background-repeat: initial initial;"> <tbody> <tr> <td align="center" valign="top" width="1133">                                                                                                                                  <table border="0" align="center" cellpadding="0" cellspacing="0" style="width: 650px;"> <tbody> <tr> <td align="left" valign="top">                                                                   <table border="0" align="center" cellpadding="0" cellspacing="0" style="width: 650px; height: 682px;"> <tbody> <tr> <td colspan="2" align="right" valign="top" mc:edit="view" style="font: normal 12px arial, helvetica, sans-serif; color: #000000; padding-bottom: 22px;">You can’t see this email?<a href="#"> View it in your browser.</a></td> </tr> <tr> <td width="287" align="left" valign="top" bgcolor="#ffffff" style="background: #fff;">                                    <p align="left"><br /> <img src="commstellogo.png" width="208" height="45" border="0" align="left" /></p> </td>  <td width="363" height="94" align="left" valign="middle" bgcolor="#ffffff" style="background: #fff;">                                      <table border="0" cellspacing="0" cellpadding="0" style="width: 340px;"> <tbody> <tr> <td align="right" valign="top" mc:edit="date" style="font: bold 18px arial, helvetica, sans-serif; color: #2f2f2f; text-transform: uppercase; padding-bottom: 8px;">01727 260 101</td> </tr> <tr> <td align="left" valign="top">                                                                                                                  <table border="0" cellspacing="0" cellpadding="0" style="width: 340px;"> <tbody> <tr> <td width="16" align="left" valign="top"><img mc:edit="h-icin" src="images/home-icon.png" width="16" height="19" alt="" /></td> <td width="64" align="left" valign="middle" mc:edit="h-text" style="font: bold 12px arial, helvetica, sans-serif; color: #414141; padding-left: 9px;"><a href="#" style="color: #414141;">Home</a></td> <td width="16" align="left" valign="top"><img mc:edit="s-icon" src="images/setting.png" width="16" height="19" alt="" /></td> <td width="79" align="left" valign="middle" mc:edit="s-text" style="font: bold 12px arial, helvetica, sans-serif; color: #414141; padding-left: 9px;"><a href="#" style="color: #414141;">Services</a></td> <td width="16" align="left" valign="top"><img mc:edit="a-icon" src="images/about-us.png" width="16" height="19" alt="" /></td> <td width="77" align="left" valign="middle" mc:edit="a-text" style="font: bold 12px arial, helvetica, sans-serif; color: #414141; padding-left: 9px;"><a href="#" style="color: #414141;">About us</a></td> <td width="18" align="left" valign="top"><img mc:edit="s-icon" src="images/support.png" width="16" height="19" alt="" /></td> <td width="54" align="right" valign="middle" mc:edit="s-text" style="font: bold 12px arial, helvetica, sans-serif; color: #414141; padding-left: 9px;"><a href="#">Contact</a></td> </tr> </tbody> </table> </td> </tr> </tbody> </table> </td> </tr> <tr> <td colspan="2" align="left" valign="top" height="548">                        <table border="0" cellspacing="0" cellpadding="0" style="width: 650px;"> <tbody> <tr> <td align="left" valign="top"><img mc:edit="banner-image" src="#" width="649" height="356" alt="" style="display: block;" /></td> </tr> <tr> <td align="left" valign="top" bgcolor="#2f2f2f" style="padding: 25px 0px 18px 20px; background: #2f2f2f;">                                                       <table border="0" cellspacing="0" cellpadding="0" style="width: 611px;"> <tbody> <tr> <td align="left" valign="top" mc:edit="banner-title" style="font: normal 24px arial, helvetica, sans-serif; color: #fff; padding-bottom: 8px;">Heading Area</td> </tr> <tr> <td align="left" valign="top" mc:edit="banner-text" style="font: normal 12px arial, helvetica, sans-serif; color: #fff; line-height: 18px; padding: 0px 0px 12px 4px;">Vivamus interdum mauris urna. 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Aliquam pretium elit varius metus hendrerit volutpat.</td> </tr> <tr> <td align="left" valign="top"><a href="#><img mc:edit="banner-read-more" src="#" width="128" height="31" alt="" /></a></td> </tr> </tbody> </table> </td> </tr> </tbody> </table>            </td> </tr> </tbody> </table>               </td> </tr> <tr></tr> <tr> <td width="330" align="left" valign="top">                                                                                                                                  <table border="0" cellspacing="0" cellpadding="0" style="width: 320px;"> <tbody> <tr> <td align="left" valign="top"><img mc:edit="two-coulmn-image1" src="businesstelephone.png" width="320" height="172" alt="" style="display: block;" /></td> </tr> <tr> <td align="left" valign="top" bgcolor="#2f2f2f" style="padding: 15px 0px 18px 20px; background: #2f2f2f;">                                                                      <table border="0" cellspacing="0" cellpadding="0" style="width: 288px;"> <tbody> <tr> <td align="left" valign="top" mc:edit="banner-title" style="font: normal 24px arial, helvetica, sans-serif; color: #fff; padding-bottom: 5px;">Heading 2</td> </tr> <tr> <td align="left" valign="top" mc:edit="banner-text" style="font: normal 12px arial, helvetica, sans-serif; color: #fff; line-height: 18px; padding: 0px 0px 12px 4px;">Praesent viverra dui in orci pulvinar convallis. Nunc interdum, metus eget adipiscing rutrum, leo quam accumsan tellus, eget . It's easy and hassle free!</td> </tr> <tr> <td align="left" valign="top"><a href="#"><img mc:edit="read-more" src="#" width="128" height="31" alt="" /></a></td> </tr> </tbody> </table>    </td> </tr> </tbody> </table>                                                                             </td> <td width="320" align="left" valign="top">                                                                                                                                               <table border="0" cellspacing="0" cellpadding="0" style="width: 320px;"> <tbody> <tr> <td align="left" valign="top"><img mc:edit="two-coulmn-image2" src="mobiles.png" width="320" height="172" alt="" style="display: block;" /></td> </tr> <tr> <td align="left" valign="top" bgcolor="#2f2f2f" style="padding: 15px 0px 18px 20px; background: #2f2f2f;">                                                                      <table border="0" cellspacing="0" cellpadding="0" style="width: 288px;"> <tbody> <tr> <td align="left" valign="top" mc:edit="banner-title" style="font: normal 24px arial, helvetica, sans-serif; color: #fff; padding-bottom: 5px;">Heading 3</td> </tr> <tr> <td align="left" valign="top" mc:edit="banner-text" style="font: normal 12px arial, helvetica, sans-serif; color: #fff; line-height: 18px; padding: 0px 0px 12px 4px;">Nunc vel massa metus, vel varius mi. Sed sagittis consectetur nisi, sed imperdiet ipsum interdum non. Nunc consectetur odio et turpis eleifend semper. Pellentesque lorem purus</td> </tr> <tr> <td align="left" valign="top"><a href="#"><img mc:edit="read-more-1" src="images/read-more.png" width="128" height="31" alt="" /></a></td> </tr> </tbody> </table>                </td> </tr> </tbody> </table>                                                   </td> </tr>  <tr> <td> </td> </tr> </tbody> </table> </td> </tr> <tr> <td align="left" valign="top">           <table border="0" cellspacing="0" cellpadding="0" style="width: 687px;"> <tbody> <tr> <td align="center" valign="top" bgcolor="#ffffff" style="background: #fff; padding: 28px 0px 27px 0px;" width="687">                                      <table border="0" align="center" cellpadding="0" cellspacing="0" style="width: 675px;"> <tbody> <tr> <td align="center" valign="top" mc:edit="un-sp-text" style="font: normal 12px arial, helvetica, sans-serif; color: #737373; line-height: 18px;" width="675">                                    <p align="center"><b>Copyright © 2012 Company - Registered & Dales 07765116</b></p> </td> </tr> <tr> <td align="center" valign="top" mc:edit="c-right-text" style="font: bold 12px arial, helvetica, sans-serif; color: #737373; line-height: 18px;" width="675">                                                <p align="center">Company Address<br /> T: 023227 000 201  E: <a href="#">[email protected]</a>  W: <a href="#">company</a></p> </td> </tr> </tbody> </table> </td> </tr> <tr> <td align="center" valign="top" style="padding: 20px 0px 35px 0px;" width="687">                        <p align="center">If you wish to unsubscribe from this email, please click here</p> </td> </tr> </tbody> </table> </td> </tr> </tbody> </table>              </body> </html>

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Multiple Foreign keys to a single table and single key pointing to more than one table

- by user1216775

I need some suggestions from the database design experts here. I have around six foreign keys into a single table (defect) which all point to primary key in user table. It is like: defect (.....,assigned_to,created_by,updated_by,closed_by...) If I want to get information about the defect I can make six joins. Do we have any better way to do it? Another one is I have a states table which can store one of the user-defined set of values. I have defect table and task table and I want both of these tables to share the common state table (New, In Progress etc.). So I created: task (.....,state_id,type_id,.....) defect(.....,state_id,type_id,...) state(state_id,state_name,...) importance(imp_id,imp_name,...) There are many such common attributes along with state like importance(normal, urgent etc), priority etc. And for all of them I want to use same table. I am keeping one flag in each of the tables to differentiate task and defect. What is the best solution in such a case? If somebody is using this application in health domain, they would like to assign different types, states, importances for their defect or tasks. Moreover when a user selects any project I want to display all the types,states etc under configuration parameters section.

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Inaccessible item using C++ inheritance

- by shinjuo

I am working on C++ project that uses inheritance. I seem to have an error in visual studio in the below file administrator.h. It says that salariedemploye:salary on line 17 is inaccessible and I am not sure why. Admin.cpp #include namespace SavitchEmployees { Administrator::Administrator( ):SalariedEmployee(), salary(0) { //deliberately empty } Administrator::Administrator(const string& theName, const string& theSsn, double theAnnualSalary) :SalariedEmployee(theName, theSsn),salary(theAnnualSalary) { //deliberately empty } void Administrator::inputAdminData() { cout << " Enter the details of the administrator " << getName() << endl; cout << " Enter the admin title" << endl; getline(cin, adminTitle); cout << " Enter the area of responsibility " << endl; getline(cin, workingArea); cout << " Enter the immediate supervisor's name " << endl; getline(cin, supervisorName); } void Administrator::outputAdminData() { cout << "Name: " << getName() << endl; cout << "Title: " << adminTitle << endl; cout << "Area of responsibility: " << workingArea << endl; cout << "Immediate supervisor: " << supervisorName << endl; } void Administrator::printCheck() { setNetPay(salary); cout << "\n___________________________________\n" << "Pay to the order of " << getName() << endl << "The sum of" << getNetPay() << "Dollars\n" << "______________________________________\n" << "Check Stub Not negotiable \n" << "Employee Number: " << getSsn() << endl << "Salaried Employee(Administrator). Regular Pay: " << salary << endl << "______________________________________\n"; } } admin.h #include <iostream> #include "salariedemployee.h" using std::endl; using std::string; namespace SavitchEmployees { class Administrator : public SalariedEmployee { public: Administrator(); Administrator(const string& theName, const string& theSsn, double salary); double getSalary() const; void inputAdminData(); void outputAdminData(); void printCheck(); private: string adminTitle;//administrator's title string workingArea;//area of responsibility string supervisorName;//immediate supervisor }; } #endif SalariedEmployee.cpp namespace SavitchEmployees { SalariedEmployee::SalariedEmployee():Employee(),salary(0) { //deliberately empty } SalariedEmployee::SalariedEmployee(const string& theName, const string& theNumber, double theWeeklyPay) :Employee(theName, theNumber), salary(theWeeklyPay) { //deliberately empty } double SalariedEmployee::getSalary() const { return salary; } void SalariedEmployee::setSalary(double newSalary) { salary = newSalary; } void SalariedEmployee::printCheck() { setNetPay(salary); cout << "\n___________________________________\n" << "Pay to the order of " << getName() << endl << "The sum of" << getNetPay() << "Dollars\n" << "______________________________________\n" << "Check Stub NOT NEGOTIABLE \n" << "Employee Number: " << getSsn() << endl << "Salaried Employee. Regular Pay: " << salary << endl << "______________________________________\n"; } } Salariedemplyee.h #ifndef SALARIEDEMPLOYEE_H #define SALARIEDEMPLOYEE_H #include <string> #include "employee.h" namespace SavitchEmployees{ class SalariedEmployee : public Employee{ public: SalariedEmployee(); SalariedEmployee(const string& theName, const string& theSsn, double theWeeklySalary); double getSalary() const; void setSalary(double newSalary); void printCheck(); private: double salary; }; } #endif employee.cpp namespace SavitchEmployees { Employee::Employee():name("No name yet"),ssn("No number yet"),netPay(0){} Employee::Employee(const string& theName, const string& theSsn):name(theName),ssn(theSsn),netPay(0){} string Employee::getName() const { return name; } string Employee::getSsn() const { return ssn; } double Employee::getNetPay() const { return netPay; } void Employee::setName(const string& newName) { name = newName; } void Employee::setSsn(const string& newSsn) { ssn = newSsn; } void Employee::setNetPay(double newNetPay) { netPay = newNetPay; } void Employee::printCheck() const { cout << "\nERROR: pringCheck function called for an \n" << "Undifferentiated employee. Aborting the program!\n" << "Check with the author of this program about thos bug. \n"; exit(1); } }

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How to determine if class meets single responsibility principle ?

- by user1483278

Single Responsibility Principle is based on high cohesion principle. The difference between the two is that highly cohesive classes feature a set of responsibilities that are strongly related, while classes adhering to SRP have just one responsibility. But how do we determine whether particular class features a set of responsibilities and is thus just highly cohesive, or whether it has only one responsibility and is thus adhering to SRP? Namely, isn't it more or less subjective, since some may find class very granular ( and as such will consider a class as adhering to SRP ), while others may find it not granular enough?

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sfdisk restore partition table if two hardisk have different sizes

- by MA1

What will happen if i try to restore the partition table of a larger hard disk to smaller hard disk, for example: partition table of 250GB hard disk to a 80GB hard disk using sfdisk like this. sfdisk /dev/sda < PartitionTable250.txt Will sfdisk detect it? I think there will be no problem if the partition table of a smaller hard disk is going to be restored on a larger hard disk?

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Single sign-on for SharePoint to MySite?

- by Chris W

I've got a fairly simple SharePoint 2010 farm set up: 2 WFE servers with Network Load Balancing hosting the main portal site. As per Microsoft's best practice recommendations I've set up My Sites in a separate web application. As some of the user base are not using domain joined PCs they have to login once for the portal (http://portal) and then again when the access My Sites since they're crossing in to a separate web application on a separate host (http://mysite). Portal & MySite are both hosted on the same physical WFE servers. Is there an easy way to set up some thing to stop this happening and just have them login once? I understand that there's plans for us to deploy ISA in the not too distant future - could we use ISA to manage authentication to the two sites so that the users only need to log in once?

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single sign-on integrating SVN

- by ramdaz

I need to authenticate my windows users on to a Linux Server which will act as a primary authentication source. Users need to be authenticated and use their access to run SVN or Mercurial ( with something like Tortoise SVN client), or some versioning system. The versioning system need to be authenticated against the Linux Server's authentication source, and users need to use their Windows login username and password to server. I'd have attempted to do this normally on Samba. But is there a better choice? Also how do you create a roaming profile? That is anyone should be able to access their SVN from any PC as long as they use their right Windows username and password

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Capitalizing on JavaScript's prototypal inheritance

- by keithjgrant

JavaScript has a class-free object system in which objects inherit properties directly from other objects. This is really powerful, but it is unfamiliar to classically trained programmers. If you attempt to apply classical design patterns directly to JavaScript, you will be frustrated. But if you learn to work with JavaScript's prototypal nature, your efforts will be rewarded. ... It is Lisp in C's clothing. -Douglas Crockford What does this mean for a game developer working with canvas and HTML5? I've been looking over this question on useful design patterns in gaming, but prototypal inheritance is very different than classical inheritance, and there are surely differences in the best way to apply some of these common patterns. For example, classical inheritance allows us to create a moveableEntity class, and extend that with any classes that move in our game world (player, monster, bullet, etc.). Sure, you can strongarm JavaScript to work that way, but in doing so, you are kind of fighting against its nature. Is there a better approach to this sort of problem when we have prototypal inheritance at our fingertips?

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Jquery Session & Table Filtering

- by Bry4n

This is my Jquery <script type="text/javascript"> $(function() { var from = $.session("from"); var to = $.session("to"); var $th = $('#theTable').find('th'); // had to add the classes here to not grab the "td" inside those tables var $td = $('#theTable').find('td.bluedata,td.yellowdata'); $th.hide(); $td.hide(); if (to == "Select" || from == "Select") { // shortcut - nothing set, show everything $th.add($td).show(); return; } var filterArray = new Array(); filterArray[0] = to; filterArray[1] = from; $.each(filterArray, function(i){ if (filterArray[i].toString() == "Select") { filterArray[i] = ""; } }); $($th).each(function(){ if ($( this,":eq(0):contains('" + filterArray[0].toString() + "')") != null && $(this,":eq(1):contains('" + filterArray[1].toString() + "')") != null) { $(this).show(); } }); $($td).each(function(){ if ($( this,":eq(0):contains('" + filterArray[0].toString() + "')") != null && $(this,":eq(1):contains('" + filterArray[1].toString() + "')") != null) { $(this).show(); } }); }); </script> This is my table <table border="1" id="theTable"> <tr class="headers"> <th class="bluedata"height="20px" valign="top">63rd St. & Malvern Av. Loop<BR/></th> <th class="yellowdata"height="20px" valign="top">52nd St. & Lansdowne Av.<BR/></th> <th class="bluedata"height="20px" valign="top">Lancaster & Girard Avs<BR/></th> <th class="yellowdata"height="20px" valign="top">40th St. & Lancaster Av.<BR/></th> <th class="bluedata"height="20px" valign="top">36th & Market Sts<BR/></th> <th class="bluedata"height="20px" valign="top">6th & Market Sts<BR/></th> <th class="yellowdata"height="20px" valign="top">Juniper Station<BR/></th> </tr> <tr> <td class="bluedata"height="20px" title="63rd St. & Malvern Av. Loop"> <table width="100%"><tr><td>12:17am</td></tr><tr><td>12:17am</td></tr><tr><td>12:47am</td></tr></table> </td> <td class="yellowdata"height="20px" title="52nd St. & Lansdowne Av."> <table width="100%"><tr><td>12:17am</td></tr><tr><td>12:17am</td></tr><tr><td>12:47am</td></tr></table> </td> <td class="bluedata"height="20px" title="Lancaster & Girard Avs"> <table width="100%"><tr><td>12:17am</td></tr><tr><td>12:17am</td></tr><tr><td>12:47am</td></tr></table> </td> <td class="yellowdata"height="20px" title="40th St. & Lancaster Av."> <table width="100%"><tr><td>12:17am</td></tr><tr><td>12:17am</td></tr><tr><td>12:47am</td></tr></table> </td> <td class="bluedata"height="20px" title="36th & Market Sts"> <table width="100%"><tr><td>12:17am</td></tr><tr><td>12:17am</td></tr><tr><td>12:47am</td></tr></table> </td> <td class="bluedata"height="20px" title="6th & Market Sts"> <table width="100%"><tr><td>12:17am</td></tr><tr><td>12:17am</td></tr><tr><td>12:47am</td></tr></table> </td> <td class="bluedata"height="20px" title="Juniper Station"> <table width="100%"><tr><td>12:17am</td></tr><tr><td>12:17am</td></tr><tr><td>12:47am</td></tr></table> </td> </tr> </table> I have asked questions on here before and I have had success in converting textbox values to dropdown changes. However this is a bit different. I am using the sessions plugin (which works fine). On one page I have a set of normal drop downs, on submit you get taken to a separate page which runs the function above, however the rows/columns all show and they don't seem to filter at all.

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IE8 isn't resizing tbody or thead when a column is hidden in a table with table-layout:fixed

- by tom

IE 8 is doing something very strange when I hide a column in a table with table-layout:fixed. The column is hidden, the table element stays the same width, but the tbody and thead elements are not resized to fill the remaining width. It works in IE7 mode (and FF, Chrome, etc. of course). Has anyone seen this before or know of a workaround? Here is my test page - toggle the first column and use the dev console to check out the table, tbody and thead width: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>bug</title> <style type="text/css"> table { table-layout:fixed; width:100%; border-collapse:collapse; } td, th { border:1px solid #000; } </style> </head> <body> <table> <thead> <tr> <th id="target1">1</th> <th>2</th> <th>3</th> <th>4</th> </tr> </thead> <tbody> <tr> <td id="target2">1</td> <td>2</td> <td>3</td> <td>4</td> </tr> </tbody> </table> <a href="#" id="toggle">toggle first column</a> <script type="text/javascript"> function toggleFirstColumn() { if (document.getElementById('target1').style.display=='' || document.getElementById('target1').style.display=='table-cell') { document.getElementById('target1').style.display='none'; document.getElementById('target2').style.display='none'; } else { document.getElementById('target1').style.display='table-cell'; document.getElementById('target2').style.display='table-cell'; } } document.getElementById('toggle').onclick = function(){ toggleFirstColumn(); return false; }; </script> </body> </html>

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java inheritance keyword super()

- by gucciv12

requirement: Given the class 'ReadOnly' with the following behavior: A (protected) integer instance variable named 'val'. A constructor that accepts an integer and assigns the value of the parameter to the instance variable 'val'. A method name 'getVal' that returns the value of 'val'. Write a subclass named 'ReadWrite' with the following additional behavior: Any necessary constructors. a method named 'setVal' that accepts an integer parameter and assigns it the the 'val' instance variable. a method 'isDirty' that returns true if the setVal method was used to override the value of the 'val' variable. Code class ReadWrite extends ReadOnly { super(int val); void setVal(int val){this.val = val;} boolean isDirty() {if (setVal()(return true)) else return false;}} More Hints: ? You should be using: modified ? You should be using: private ? You should be using: public

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Static variables in static method in base class and inheritance

- by Adal

I have these C++ classes: class Base { protected: static int method() { static int x = 0; return x++; } }; class A : public Base { }; class B : public Base { }; Will the x static variable be shared among A and B, or will each one of them have it's own independent x variable (which is what I want)?

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[PHP] Singleton class and using inheritance

- by Saif Bechan

I have am working on a web application that makes use of helper classes. These classes hold functions to various operation such as form handling. Sometimes I need these classes at more than one spot in my application, The way I do it now is to make a new Object. I can't pass the variable, this will be too much work. I was wondering of using singleton classes for this. This way I am sure only one instance is running at a time. My question however is when I use this pattern, should I make a singleton class for all the objects, this would b a lot of code replication. Could I instead make a super class of superHelper, which is a singleton class, and then let every helper extend it. Would this sort of set up work, or is there another alternative? And if it works, does someone have any suggestions on how to code such a superHelper class. Thank you guys

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Inheritance of templates in WPF

- by Alxandr

I'm trying to make sure that every child of a given element (MPF.MWindow) gets custom templates. For instance, the button should get the template defined in resMButton.xaml. As of now I'm using the following code on: (resMWindow.xaml) <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:MPF"> <Style x:Key="SystemKeyAnimations" TargetType="{x:Type Button}"> <Setter Property="Opacity" Value="0.5" /> <Setter Property="Background" Value="Transparent" /> <Style.Triggers> <EventTrigger RoutedEvent="Mouse.MouseEnter"> <BeginStoryboard> <Storyboard> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="Opacity"> <SplineDoubleKeyFrame KeyTime="00:00:00.2" Value="1.0" /> </DoubleAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger> <EventTrigger RoutedEvent="Mouse.MouseLeave"> <BeginStoryboard> <Storyboard> <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="Opacity"> <SplineDoubleKeyFrame KeyTime="00:00:00.2" Value="0.5" /> </DoubleAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger> </Style.Triggers> </Style> <Style TargetType="{x:Type local:MWindow}">  <Setter Property="WindowStyle" Value="None" /> <Setter Property="AllowsTransparency" Value="True" /> <Setter Property="Background" Value="Transparent" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type local:MWindow}"> <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" x:Name="ChromeBorder"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="4" /> <ColumnDefinition /> <ColumnDefinition Width="4" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="4" /> <RowDefinition /> <RowDefinition Height="4" /> </Grid.RowDefinitions> <Thumb Grid.Row="0" Grid.Column="1" x:Name="TopThumb" Cursor="SizeNS" BorderThickness="4" BorderBrush="Transparent" /> <Thumb Grid.Row="2" Grid.Column="1" x:Name="BottomThumb" Cursor="SizeNS" BorderThickness="4" BorderBrush="Transparent" /> <Thumb Grid.Row="1" Grid.Column="0" x:Name="LeftThumb" Cursor="SizeWE" BorderThickness="4" BorderBrush="Transparent" /> <Thumb Grid.Row="1" Grid.Column="2" x:Name="RightThumb" Cursor="SizeWE" BorderThickness="4" BorderBrush="Transparent" /> <Thumb Grid.Row="0" Grid.Column="0" x:Name="TopLeftThumb" Cursor="SizeNWSE" BorderThickness="5" BorderBrush="Transparent" /> <Thumb Grid.Row="0" Grid.Column="2" x:Name="TopRightThumb" Cursor="SizeNESW" BorderThickness="5" BorderBrush="Transparent" /> <Thumb Grid.Row="2" Grid.Column="0" x:Name="BottomLeftThumb" Cursor="SizeNESW" BorderThickness="5" BorderBrush="Transparent" /> <Thumb Grid.Row="2" Grid.Column="2" x:Name="BottomRightThumb" Cursor="SizeNWSE" BorderThickness="5" BorderBrush="Transparent" /> <Grid Grid.Row="1" Grid.Column="1"> <Grid.RowDefinitions> <RowDefinition Height="20" /> <RowDefinition /> </Grid.RowDefinitions> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <StackPanel Orientation="Horizontal" Grid.Column="1"> <Button Command="local:WindowCommands.Minimize" Style="{StaticResource ResourceKey=SystemKeyAnimations}"> <Button.Template> <ControlTemplate> <Canvas Width="10" Height="10" Margin="5" Background="Transparent"> <Line X1="0" X2="10" Y1="5" Y2="5" Stroke="White" StrokeThickness="2" /> </Canvas> </ControlTemplate> </Button.Template> </Button> <Button Command="local:WindowCommands.Maximize" x:Name="MaximizeButton" Style="{StaticResource ResourceKey=SystemKeyAnimations}"> <Button.Template> <ControlTemplate> <Canvas Width="10" Height="10" Margin="5" Background="Transparent"> <Rectangle Width="10" Height="10" Stroke="White" StrokeThickness="2" /> </Canvas> </ControlTemplate> </Button.Template> </Button> <Button Command="ApplicationCommands.Close" Style="{StaticResource ResourceKey=SystemKeyAnimations}"> <Button.Template> <ControlTemplate> <Canvas Width="10" Height="10" Margin="5" Background="Transparent"> <Line X1="0" X2="10" Y1="0" Y2="10" Stroke="White" StrokeThickness="2" /> <Line X1="10" X2="0" Y1="0" Y2="10" Stroke="White" StrokeThickness="2" /> </Canvas> </ControlTemplate> </Button.Template> </Button> </StackPanel> <ContentControl x:Name="TitleContentControl"> <TextBlock Text="{TemplateBinding Title}" Foreground="DarkGray" Margin="5,0" /> </ContentControl> </Grid> <ContentPresenter Content="{TemplateBinding Content}" Grid.Row="1"> <ContentPresenter.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/MPF;component/Themes/resMWindowContent.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </ContentPresenter.Resources> </ContentPresenter> </Grid> </Grid> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary> As you can see during the ContentPresenter which gets the content of the window I merge in a dicrionary called resMWindowContent.xaml. The resMWindowContent.xaml looks as following: <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:MPF"> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/MPF;component/Themes/resMButton.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> It simply merges in the resMButton.xaml dictionary (this is done because in the feature I will have MTextBox, mList... and I want to separate them). The resMButton.xaml looks as following: <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:MPF"> <Style TargetType="{x:Type Button}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Button}"> <Grid Background="Transparent"> <Rectangle Stroke="{TemplateBinding BorderBrush}" StrokeThickness="{TemplateBinding BorderThickness}" Fill="{TemplateBinding Background}" /> <ContentPresenter Content="{TemplateBinding Content}" Margin="3" /> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary> A simple template drawing a square button. However, it isn't applied at all. My buttons remain normal, and I don't understand what I'm doing wrong. I just want every button inside the MWindow to get a special style (and in time every textbox and so forth). How do I achieve this? One note though: It's important that the styles doesn't apply to elements outside an MWindow.

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C# Interface Inheritance (Basics)

- by anton

Why does the following produce a compiler error: public interface OwnSession : ISession { } [...] OwnSession s = SessionFactory.OpenSession(); // compiler error (in german unfortunately) [...] "SessionFactory" returns a "ISession" on "OpenSession()" (NHibernate)

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Python: Inheritance of a class attribute (list)

- by Sano98

Hi everyone, inheriting a class attribute from a super class and later changing the value for the subclass works fine: class Unit(object): value = 10 class Archer(Unit): pass print Unit.value print Archer.value Archer.value = 5 print Unit.value print Archer.value leads to the output: 10 10 10 5 which is just fine: Archer inherits the value from Unit, but when I change Archer's value, Unit's value remains untouched. Now, if the inherited value is a list, the shallow copy effect strikes and the value of the superclass is also affected: class Unit(object): listvalue = [10] class Archer(Unit): pass print Unit.listvalue print Archer.listvalue Archer.listvalue[0] = 5 print Unit.listvalue print Archer.listvalue Output: 10 10 5 5 Is there a way to "deep copy" a list when inheriting it from the super class? Many thanks Sano

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Tricky model inheritance - Django

- by RadiantHex

Hi folks, I think this is a bit tricky, at least for me. :) So I have 4 models Person, Singer, Bassist and Ninja. Singer, Bassist and Ninja inherit from Person. The problem is that each Person can be any of its subclasses. e.g. A person can be a Singer and a Ninja. Another Person can be a Bassist and a Ninja. Another one can be all three. How should I organise my models? Help would be much appreciated!

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problem with template inheritance

- by amiad

I'm trying to understand whay i get an error on this code: (the error is under g++ unix compiler. VS is compiling OK) template<class T> class A { public: T t; public: A(const T& t1) : t(t1) {} virtual void Print() const { cout<<*this<<endl;} friend ostream& operator<<(ostream& out, const A<T>& a) { out<<"I'm "<<typeid(a).name()<<endl; out<<"I hold "<<typeid(a.t).name()<<endl; out<<"The inner value is: "<<a.t<<endl; return out; } }; template<class T> class B : public A<T> { public: B(const T& t1) : A<T>(t1) {} const T& get() const { return t; } }; int main() { A<int> a(9); a.Print(); B<A<int> > b(a); b.Print(); (b.get()).Print(); return 0; } This code is giving the following error: main.cpp: In member function 'const T& B::get() const': main.cpp:23: error: 't' was not declared in this scope It did compiled when i changed the code of B to this: template<class T> class B : public A<T> { public: B(const T& t1) : A<T>(t1) {} const T& get() const { return A<T>::t; } }; I just cant understand what is the problem with the first code... It doesn't make sense that i really need to write "A::" every time...

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Misunderstanding I have about javascript prototype inheritance

- by Ilya

Simple questions. function p() { function A() { this.random = "random"; } A.prototype.newfunc = function(){ alert("5");} function B() { } B.prototype = new A(); var bObj = new B(); } Q1: When I set B's prototype, I don't get how B's prototype property will update when/if A's prototype is updated. I mean, to me it just inherits/copies all those properties. It's not like it's: B.prototype = A.prototype where B and A are one in the same. Q2: After A is being returned and intialized to the prototype object of B, how does JS know not to include that prototype property? What I mean is, we never have this type of situation occuring as the JS interpreter knows just to chop off the property of A's prototype: B.prototype = new A(); //any A object has an associated prototype object B.prototype.prototype;//after initialization we no longer have the separate prototype property of A

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CSS inheritance: applying selector for itself and every descendant

- by Cawas

Get a custom user CSS and type this .answered-accepted { color: white !important; background: #090 !important; } Now go to answers.unity3d and look for an accepted answer. The design looks bad, because the <strong> in there overrides the customization. The fix I've found is this: .answered-accepted, .answered-accepted * { color: white !important; background: #090 !important; } Now it looks fine on the website, but the code looks ugly!! How can I do this without repeating the class name?

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