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• Getting started with C++ ( the paradigm shift from Python )

  - by orokusaki

  I want to learn C++ so that i can develop C++ Python modules for server-related stuff. I'm a purely dynamic languages developer (Python, PHP, Ruby, etc). I want to learn a fast language, and if I'm going to do this, I'd rather learn a really fast language like C++. Before I even get started though, I understand that suddenly working with static types, a different syntax, and compiling code will be quite the paradigm shift. Is there any advice that a C++ dev who also has dynamic languages experience can give me to me to help me make that shift faster?

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• Javascript: How to filter object array based on attributes?

  - by JGreig

  I have the following JavaScript JSON array of real estate home objects: var json = { 'homes' : [ { "home_id":"1", "price":"925", "sqft":"1100", "num_of_beds":"2", "num_of_baths":"2.0", }, { "home_id":"2", "price":"1425", "sqft":"1900", "num_of_beds":"4", "num_of_baths":"2.5", }, // ... (more homes) ... ]} var xmlhttp = eval('(' + json + ')'); homes = xmlhttp.homes; What I would like to do is be able to perform a filter on the object to return a subset of "home" objects. For example, I want to be able to filter based on: price, sqft, num_of_beds, and num_of_baths. Question: How can I perform something in javascript like the pseudo-code below: var newArray = homes.filter( price <= 1000 & sqft >= 500 & num_of_beds >=2 & num_of_baths >= 2.5); Note, the syntax does not have to be exactly like above. This is just an example.

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• Get/Set nested property values

  - by Daniel Deer

  I'll try to be more descriptive here. A Few Q's: using: var foo = new Foo() { Bar = new Bar() { Value = "Value" } }; var value = DataBinder.Eval(foo, "Bar.Value"); Or: This one It is possible to retrieve an internal nested property using property path syntax. Is there a way to set/trigger a nested property (a regular property not DependencyProperty) easily with some kind of simple mechanisms as described here? I want to acheive something like: string newValue = "Hello World!"; DataBinder.EvalSet(foo, "Bar.Value", NewValue); Is there any mechanism that support both property path (for nested objects) and XPATHs (if the objects are XPATH navigable of course) ? again, that supports get and set options. Thanks, DD

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• Letting user carry on after three attempts

  - by sMilbz

  In my spelling game there is a grid that is populated with words. The words are hidden and the aim of the game is to spell the word that is highlighted with the aid of a sound and a picture. To highlight a word you press the "next" button. At the moment if you spell the word correctly it says "well done" and you can advance to the next word, but if you spell it incorrectly you have to keep attempting the word until it is complete. As the game is designed for children I do not think this is the best approach, so I would like to make it so you can advance after 3 incorrect attempts. I have played around with the script so much trying to put counters on incorrect attempts and then making the button active but cannot seem to get it to work. Can someone please help me? Here is the script for the button var noExist = $('td[data-word=' + listOfWords[rndWord].name + ']').hasClass('wordglow2'); if (noExist) { $('.minibutton').click(); } else { $('.minibutton').click('disable'); $("#mysoundclip").attr('src', listOfWords[rndWord].audio); audio.play(); $("#mypic").attr('src', listOfWords[rndWord].pic); pic.show(); } }); "wordglow2" is the style applied if the word is spelt correctly. Here is a fiddle to help understand... http://jsfiddle.net/smilburn/ZAfVZ/4/

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• applying a var to an if statement jquery

  - by Dirty Bird Design

  Need to apply a var to a statement if its conditions are met, this syntax isn't throwing errors but its not working. <script type="text/javascript"> $(document).ready(function(){ var action_is_post = false; //stuff here $(this).ready(function () { if ($("#stepDesc0").is(".current")) { action_is_post = true; } }); //stuff here </script> should I use something other than .ready? Do I even need the $(this).ready(function ()... part? I need it to apply the var when #stepDesc0 has the class current.

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• XPath to compare two distinct attributes of two elements

  - by user364902

  Suppose I have this XML: <x> <e s="1" t="A"/> <e s="2" t="A"/> <e s="1" t="B"/> </x> Is there any way to write an xpath to find any nodes named "e" which have the same value of @s as another node but a different value of @t for the same node. The first part is easy: //e[@s = //e/@s] as is the second part: //e[@t != //e[@t]] But I don't see any way to construct an xpath that compares two different attributes for two separate elements "e". Is there a way within the xpath syntax, or is it hopeless?

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• [WordPress] Need help with remove_action()

  - by gabriel

  I'm trying to remove the unsightly embedded <STYLE> tag the built-in Recent Comments widget puts in my <HEAD>, but I can't seem to get the syntax right. It originally calls add_action( 'wp_head', array(&$this, 'recent_comments_style') ); to add it (in wp-includes/default-widgets.php, line 609), and I'm trying to undo it. I think it should be something like this: remove_action('wp_head', 'WP_Widget_Recent_Comments::recent_comments_style'); but with all the variations I've tried I still can't get it right. Does anyone know how to achieve this? Possibly Helpful: Function Reference: remove_action

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• How to get a dynamic attribute name in cfloop over query in ColdFusion

  - by Kip

  I'm inside a cfloop over a query. I want to get an attribute, but I won't know what that attribute will be until runtime. Using #qryResult[MyAttr]# fails with the error "Complex object types cannot be converted to simple values." What is the syntax for doing this? Here is a simplified example: <cfquery datasource="TestSource" name="qryResult"> SELECT * FROM MyTable </cfquery> <cfloop query="qryResult"> <cfset MyAttr="autoid" /> <cfoutput> Test 1: #qryResult.autoid# <br/> <!--- succeeds ---> Test 2: #qryResult[MyAttr]# <br/> <!--- fails ---> </cfoutput> </cfloop>

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• jQuery broken function after added new function

  - by Kyle Sevenoaks

  What's wrong here? The alert function was working until I added this new function to it. Is there anything I am doing wrong? It just simply doesn't fire the alert anymore. <input value="1" type="checkbox" name="salgsvilkar" id="checkbox2" style="float:left;" /> {literal} <script src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript"> $(function() { //checkbox $("#scrollwrap").click(function(){ $("#scrollwrap").toggleClass('highlight'); });? }); $(function(){ //button $("#fullfor_btn").click(function(e){ if(!$("#checkbox2").is(':checked') == false) { alert("Please accept the terms of sale."); e.preventDefault(); } }); }); </script> {/literal} <button type="submit" class="submit" name="{$method}" id="fullfor_btn" title="Fullfør bestillingen nå" value="">&nbsp;</button>

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• How to get the required value displayed from the given array?

  - by Parth

  From below array i want the value of "_sql" to be displayed or we can I want to echo the "_sql" value, so what should be the syntax to display it in PHP code? JTableMenu Object ( [lft] => [rgt] => [home] => [_tbl] => #__menu [_tbl_key] => id [_db] => JDatabaseMySQL Object ( [name] => mysql [_nullDate] => 0000-00-00 00:00:00 [_nameQuote] => ` [_sql] => INSERT INTO `jos_menu` ( `id`,`menutype`,`name`,`alias`,`link`,`type`,`published`,`componentid`,`parent`,`ordering`,`checked_out`,`checked_out_time`,`brow............ [_errorNum] => 0 ) )

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• Cakephp, Retreive Data for HABTM Models using conditional find

  - by ion

  There are 2 Models: Project & Category that are bind with HABTM relationship. I would like to perform a search from projects controller that can do the following: FIND all DISTINCT Project.scedule WHERE Category.slug != 'uncategorised' Apologies for the syntax, I'm no sequel expert. What I have managed to do is to retrieve all projects that do not belong to Category uncategorised into an array however I'm not sure as to how to search again the array result for DISTINCT Project.schedule values (needed to fill out a form drop down) I hope I made myself clear.

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• How do you escape parentheses in a Binding indexer

  - by Chris S

  I have the following XAML: <Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource MyDataKey}}"> <TextBox Name="_myId" Text="{Binding MyDictionary[(Textbox.Name)]" /> </Grid> But it thinks the key in my dictionary is called "(Textbox.Name)", instead of "_myId". The format below works, where I have a property in my class called "_myId": <TextBox Name="_myId" Text="{Binding (Textbox.Name)" /> I've tried using ^ and \ to escape the brackets. Is this syntax supported? I'm trying to avoid duplication of the name in two attributes.

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• R scatterplot overplotting color

  - by rgeekay

  So far I have this: qplot(df[[1]], as.numeric(rownames(df)), group=df[[2]], color=df[[2]], ylab="") I want to use different colors for the points in the 2 groups - perhaps a lighter shade for the what's in black now and a darker - say, red for what's in blue. Also, I want to use hexbin kind of thing for group=0 but not for group=1. I'm not able to get the syntax to get this working. In the current plot 0 is in black and 1 is in blue. Added: I worked on it some more, and by using factor and scale_colour_manual, I got the grey color for 0 and red for 1: > palette1 [1] "grey" "red" "blue" "violet" "black" fy=factor(y, labels=c('grey', 'red')) qplot(x, seq(1:length(x)),col=fy, ylab="") + geom_point() + scale_colour_manual(values=palette1) Pending questions are: How to first plot all the grey and then red on top (some of the red is now hidden because the grey is plotted over). How to apply the hexbin logic for group0 i.e. the grey points only and not for the red.

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• if exists, update, else insert new record

  - by I__

  i am inserting values into a table if the record exists already replace it, and if it does not exist then add a new one. so far i have this code: INSERT INTO table_name VALUES (value1, value2, value3,...) where pk="some_id"; but i need something like this if not pk="some_id" exists then INSERT INTO table_name VALUES (value1, value2, value3,...) where pk="some_id"; else update table_name where pk="some_id" what would be the correct SQL syntax for this? please note that i am using sql access and that i guess it can be a combination of vba and sql

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• Function return type style

  - by JB

  I'm learning c++0x, at least the parts supported by the Visual C++ Express 2010 Beta. This is a question about style rather than how it works. Perhaps it's too early for style and good practice to have evolved yet for a standard that isn't even released yet... In c++0x you can define the return type of a method using - type at the end of the function instead of putting the type at the start. I believe this change in syntax is required due to lambdas and some use cases of the new decltype keyword, but you can use it anywhere as far as I know. // Old style int add1(int a, int b) { return a + b; } // New style return type auto add2(int a, int b) -> int { return a + b; } My question really then, is given that some functions will need to be defined in the new way is it considered good style to define all functions in this way for consistency? Or should I stick to only using it when necessary?

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• VB.NET logical expression evaluator

  - by Tim

  I need to test a logical expression held in a string to see if it evaluate to TRUE or FALSE.(the strig is built dynamically) For example the resulting string may contain "'dog'<'cat' OR (14 AND 4<6)". There are no variables in the string, it will logically evaluate. It will only contain simple operators = < < = <= and AND , OR and Open and Close Brackets, string constants and numbers. (converted to correct syntax && || etc.) I currently acheive this by creating a jscipt function and compiling it into a .dll. I then reference the .dll in my VB.NET project. class ExpressionEvaluator { function Evaluate(Expression : String) { return eval(Expression); } } Is there a simpler method using built in .NET functions or Lamdba expressions.

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• best way to filter out non-representational elements

  - by nonano

  Hi there, I am using phpQuery in order to apply some twaks to editorial content. As its syntax is the same as jQuery, I consider this a dom scripting issue. To get rid of elements which are not representing anything, but wrapping other stuff (like the div in <div><p>blah</p></div> I came up with this selector: ['div:not([align][class][id][style][title][dir][lang][onclick][ondblclick][onmousedown] [onmouseup][onmouseover][onmousemove][onmouseout][onkeypress][onkeydown][onkeyup])'] which looks quite monstrous for a selector simply aming on Divs which just do not have any (valid) attribute. I guess there must be a more straight-forward way to accomplish that, right? Edit: Oh, and I just noticed that it even doesn't do wat I intended to ...

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• Listing C/C++ functions (Code analysis in Unix)

  - by Jond

  Whether we're maintaining unfamiliar code or checking out the implementation details of an Apache module it can help if we can quickly traverse the code and build up an overview of what we're looking at. Grep serves most of my daily needs but there are some cases where it just wont do. Here's a common example of how it can help. To find the definition of a PHP function I'm interested in I can type this at the command line: grep -r "function myfunc" . This could be adapted very quickly to C or C++ if we know the return type, but things become more complicated if, say, I want to list every method that my class provides: grep "function " ./src/mine.class.php Since there's no single keyword that denotes a function or method in C++ and because it's generally more complex syntax, I think I'd need some kind of static code analysis tool, smart use of the C Preprocessor or blind faith the coder followed strict code guidelines (# of whitespace, position of curlies etc) to get these sorts of results. What would you recommend? p.s. be nice, this is my first post ;-) :p

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• query in query builder in a Table Adapter

  - by Sony

  I am working with the datasets of .net I have an Oracle Query which is working fine . but I copy the query as sql statement within Table Adapter wizard and after I clicked the Query Builder button ,there is SQL syntax error. The query is below: SELECT lead_id, NAME, ADDRESS, CITY, EMAIL, PHONE, PINCODE, STATE, QUALIFICATION, DOB, status FROM (SELECT l.lead_id, l.NAME, l.ADDRESS, l.CITY, l.EMAIL, l.PHONE, l.PINCODE, l.STATE, l.QUALIFICATION, l.DOB, CASE WHEN s.status IS NULL THEN 'Not Updated !' ELSE s.status END status, row_number() over(PARTITION BY l.lead_id ORDER BY t .CREATED_DATE DESC) rn FROM LEADS l JOIN Leads lc ON l.USER_ID = lc.USER_ID AND l.USER_ID = :iuser_id AND(l.CREATED_DATE BETWEEN (TO_DATE(:ifrom_date , 'dd-mm-yyyy') ) AND (TO_DATE (:ito_date, 'dd-mm-yyyy' ) )) LEFT JOIN LEADTRANSACTION t ON l.lead_id = t .lead_id LEFT JOIN STATUS s ON s.STATUS_ID = t .STATUS_ID) WHERE rn = 1;

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• jQuery child of clicked element

  - by Tom

  Hi, I've got a list of links which have a click event attached to them, I need to get the ID from the child A link. So in the example below if I clicked the first list element I'd need google retuned. I've tried '$this a' but can't quite work out the syntax. jQuery: $("ul li").click(function(event){ $("input").val($(this).html()); } ); html: <ul> <li><a href="http://www.google.com" id="google">Google</a> </ul>

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• antlr: How to rewrite only specific

  - by user1293945

  I am sure antlr can solve my problem, but can't figure out how to implement it, even high level. I rapidly got caught into syntax problems of antlr itself. My grammar is quite simple and made of following tokens and rules. Don't really need to go in their details here. The evaluator resolves to expressions, which finally resolve to IDENT: evaluator : expression EOF! ; ... ... term : PARTICIPANT_TYPE(IDENT | '('! expression ')'! | max | min | if_ | NUMBER)+ ; Now, I would like to analyse and rewrite the 'term', so that IDENT tokens (and them only) get re-written with the PARTICIPANT_TYPE. All the others should simply remain the same.

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• .NET application with an Oracle Database

  - by Pavitar

  I have to code a desktop application and some dynamic web content. I'm planning to develop it in .NET with an Oracle database, though my dilemma is that my professor says that if I do so, there would be a lot of support issues later on. He says .NET is more compatible with MS SQL and MS Access, and so is the trend, everyone does it.Is it true? I have learnt Oracle so I know of a few features which I wouldn't be able to implement on SQL comfortably because of lack of knowledge of SQL databases.I would love to learn the new syntax but again, I don't have much time to spare.

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• WebView not responding when called from a method

  - by AragornSG

  I have an app with tabbar and webview. I'm trying to make the app come back to default url each time user taps the bar. Right now I'm intercepting taps and launching a method, however it's not affecting my webview. The same syntax for calling webview from awakeFromNib works, so I don't have a clue what's up. I suspect it's something to do with how I call the method, but I don't know what. Here is the code: #import "SecondViewController.h" @implementation SecondViewController - (void)awakeFromNib { NSString *loadURL = [NSString stringWithFormat:@"http://pageurl"]; // [secondView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadURL]]]; SecondViewController *ptr = [[SecondViewController alloc] init]; [ptr goToPage]; } - (void) goToPage { NSLog(@"go to page"); NSString *newURL = [NSString stringWithFormat:@"http://pageurl"]; [secondView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:newURL]]]; } Thanks fot your help!

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• Rails - Displaying Large Set of Data in a Table / Start new column after X rows

  - by ChrisWesAllen

  Hi, I trying to display a large set of checkboxes in my rails app and didnt knwo the syntax for displaying like 15 rows then after starting a new column. I have a model with about 120 entries. Currently, I have it being displayed in the view as.... <% for interest in Interest.find(:all) %> <%= check_box_tag Blah Blah Blah %> <%= interest.name %> <% end %> How can I make it so it makes a table and after every 15 or so rows make a new column???

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• Access SQL query to SELECT from one table and INSERT into another

  - by typoknig

  Below is my query. Access does not like it, giving me the error Syntax error (missing operator) in query expression 'answer WHERE question = 1'. Hopefully you can see what I am trying to do. Please pay particular attention to 3rd, 4th, and 5th lines under the SELECT statement. INSERT INTO Table2 (respondent,1,2,3-1,3-2,3-3,4,5) SELECT respondent, answer WHERE question = 1, answer WHERE question = 2, answer WHERE answer = 'text 1' AND question = 3, answer WHERE answer = 'text 2' AND question = 3, answer WHERE answer = 'text 3' AND question = 3, answer WHERE question = 4, longanswer WHERE question 5 FROM Table1 GROUP BY respondent;

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