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• Storing expression template functors

  - by UncaughtException

  Hello guys, at the moment I'm really interested in expression templates and want to code a library for writing and differentiating mathematical functions with a lambda-style syntax. At the moment, I'm able to write (_x * _x)(2); and get the correct result 4. But I would really like to do something like MathFunction f = _x * _x; f(2);, but I don't have any ideas on how to cope with the recursive expression templates on the right side. Is it possible to achieve this without using the 'auto'-Keyword instead of MathFunction or having to make the operator() virtual? Thanks for your help!

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• C# Event routing in code behind

  - by Nate

  I'm building a WPF MVVM-ish application. I want to be able to display an event log containing items in a collection that exists in my viewmodel. I want any of the objects in the model to be able to add data to the event log. Therefore every object needs to be able to pass data back to one central collection for databinding in the view. I could implement an event in every one of my data classes and manually pass the events up the object heirarchy but this seems super clumsy. On the visual tree a Routed Event would take care of this, is there some equivelent in the model scope? Any other ideas?

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• Replacing whitespace with sed in a CSV (to use w/ postgres copy command)

  - by Wells

  I iterate through a collection of CSV files in bash, running: iconv --from-code=ISO-8859-1 --to-code=UTF-8 ${FILE} | \ sed -e 's/\"//g' | \ sed -e 's/, /,/g' \ > ${FILE}.utf8 Running iconv to fix UTF-8 characters, then the first sed call removes the double quote characters, and the final sed call is supposed to remove leading and trailing whitespace around the commas. HOWEVER, I still have a line like this in the saved file: FALSE,,,, 2.40,, The COPY command in postgres is kind of dumb, so it thinks " 2.40" is not valid syntax for a numeric value. Where am I going wrong w/ my processing of the CSV file? Thanks!

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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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• How do I Reload Ajax Call Parameters without Reloading the webpage

  - by Snowright

  I'm working with Extjs 2.2.1 with Alfresco 3.2 enterprise. I would like to update the ticket that handles authentication to the alfresco server on components that have been loaded during login. This ticket expires after a set time and this is why I will need to update the ticket. Options that do not seem viable for me(but please let me know if I'm wrong): Reload the components to reload the call parameters - I can't do this because it resets whatever the user was previously working on (ie. Tree panel gets reloaded, grid filters reset, etc). The actual webpage never reloads as everything uses ajax calls to update things on the page. Create a global variable that stores the ticket and attach it as a call parameter with any ajax calls - Any components that were loaded during login will still use the original ticket to make calls to the server.

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• Best way to check for nullable bool in a condition expression (if ...)

  - by FireSnake

  I was wondering what was the most clean and understandable syntax for doing condition checks on nullable bools. Is the following good or bad coding style? Is there a way to express the condition better/more cleanly? bool? nullableBool = true; if (nullableBool ?? false) { ... } else { ... } especially the if (nullableBool ?? false) part. I don't like the if (x.HasValue && x.Value) style ... (not sure whether the question has been asked before ... couldn't find something similar with the search)

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• Transitioning from C++ to C#

  - by Jim

  I am very experienced in C and C++ but am having problems finding current opportunities. I decided to switch to C# but noticed that while the syntax is very similar, the programming styles are very different (we don't have IEnumerable etc in C). So the problem I am having now is having 20 years of experience but is only a junior when it comes to interviewing for a C# job. Most of the problems are me not being able to answer questions like 1) How do you do XYZ in Sql Server? 2) What's the use of in Spring.NET In other words, the phone interviewers don;t care if you know DB programming or not - they want to know if you know SQL Server. I am frustrated because the guys who are doing the interviews seem to be so narrow sighted in knowing ONLY C#, .NET and SQL Server, that I don't know how to get past them.

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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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• why i'm permanently logged off my be

  - by Fixus

  Hello i have a problem with BE in my system. I'm permanently and automaticly logged out it after some time. 10-15 seconds, sometimes faster, sometimes slower. It's not connected with beeing idle cause I can be logged off even when I'm checking page tree or saving records I've set lock ip on 1 but it didn't help. The problem is most common under Firefox or Chome, what is strange under internet explorer i don't see it as often Other strange thing is that I see it on my live version but when I'm working on my local copy it doen not occure TYPO3 version 4.6.4

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• Help with PHP MySQL join

  - by kester martinez

  Please help me to understand proper join syntax. I have table named inventory which has: trans_id trans_items items -> item_id trans_user employees -> person_id trans_date trans_comment trans_inventory As you can see above, trans_items is a foreign key in items table, and trans_user is a foreign key in employees table. Now what I want to do is to display in HTML the inventory table, but instead of displaying the item id, I want the ITEM NAME to be displayed. Here is what I have done. Please note I'm using CodeIgniter. public function getData(array $inputs) { $this->db->select('trans_items, trans_user, trans_date, trans_inventory, trans_comment'); $this->db->from('inventory'); $this->db->order_by('trans_date desc'); return $this->db->get()->result_array(); }

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• Drawing up a session value within SQL query? PHP and MySQL

  - by Derek

  Hi, on one of my web pages I want my manager user to view all activities assigned to them (personally). In order to do this, I need something like this: $sql = "SELECT * FROM activities WHERE manager = $_SESSION['SESS_FULLNAME']"; Now obviously this syntax is all wrong, but because I am new to this stuff, is there a way I can call up the full name from the user's session within a query? This is so that when I call up the database values to be displayed within the web page, only the activities for the manager who is logged in is displayed. For example, the activities table has a manager column of a full name entry. Any help is much appreciated. Thanks.

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• not working function with no errors

  - by aya

  hello.. I've implemented a function to display an avl tree after inserting nodes into it like this template void AVLtree::display() const { display(Proot); } template void AVLtree::display(Node * ptr) const { if(ptr==0) return ; cout<value<<" "; display(ptr-Pleft); display(ptr-Pright); } after compiling,there were no errors ,the program worked but nothing were printed on the screen help me please....!! thanks

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• How do I "merge" two separate git repositories of the same website without losing commit data?

  - by PHLAK

  I have two separate git repositories for the same version of a single website. domain.com-1.0 domain.com-2.0 Version 2.0 was completely redone from the ground up. There is no bridge between the two repositories. I would now like to merge the two into a single repository, but maintain the separation. I have already tagged domain.com-1.0 in it's repo and now want to clean the working tree and move domain-2.0 and all it's commit history into 1.0's repo. Is this possible or is there a better way of accomplishing this? Note: domain.com-1.0 will not be developed on anymore and is "being retired".

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• How to Print the contents of a textbox in C++/CLI?

  - by Smoka

  I'm still learning C++ coding. I'm having troubles getting say ResultsBox-Text to printer successfully. What is the proper way to print in C++/CLI? I think im missing something simple. Ive tried multiple different routes/syntax's that ive read online/ in books. All of which got me to a dead end. Please even a rundown on the method of printing in any C based language might point me the right way. Thank you.

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• adding a background color to search term results

  - by turborogue

  I'm trying to add a background color to a user submitted search result when a user enters a search term on a page (which is basically one big table). This is a text based search. I'm using jquery to show/hide the table rows that do not have the search term as text within the TR, but I'd ideally like to take the additional step of taking the search term (the entered value), and matching any of those text terms in the remaining (showing) rows and adding say a yellow background to the word(s). I know my syntax is currently wrong, just not sure what is correct:) Hopefully this is clear...any help is greatly appreciated! html of form: jquery: $("#searchsubmit").click(function () { var searchexp = document.getElementById('searchbox').value; $("table tr").hide(); $("table tr.header").show(); $('tr:contains('+ searchexp +')').show(); $(searchexp).css('background-color','yellow'); });

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• Retreiving data from grid view cell to a text box

  - by Bader

  Hello , i am trying to retrieve a cell data to a textbox , that will happen when i select any row in the grid view , the textbox will take the new value i already enabled auto post back to the textbox here is my code protected void GridView2_SelectedIndexChanged(object sender, EventArgs e) { TextBox3.Text = GridView2.Rows[GridView2.SelectedIndex].Cells[2].Text; } however , there is not error in the syntax , it doesn't retrieve any thing in the textbox , any suggestions ? i am using using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; using System.Data.Sql; i work in C# , Visual studio 2010 express web developer

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• jQuery blockUI and AJAX POST

  - by oompahloompah

  I am using jQuery BlockUI in a project. For a particular user action, I want to block the UI, and then POST data to the server. When the timeout event occurs OR the server returns, I want to unblock the page. I can't seem to implement this behaviour. This is what I have so far (not working) $(document).ready(function(){ $('#test').click(function(event){ $.blockUI({ message: $('#syntax-chk') }); $.ajax({ type: 'POST', url: 'www.example.com', data: somedata, dataType: "json" }); setTimeout(function() { $.unblockUI({ onUnblock: function(){ alert('onUnblock'); } }); }, 2000); }); can anyone spot what I may be doing wrong?

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• Centering images php

  - by peak

  I'm trying to center an image in php. I'm currently using this line of code echo '<img src="newimage.jpg" width="110" height="120" class="centre">'; However, this seems to have no effect. I've also tried using something like this, img.center { display: block; margin-left: auto; margin-right: auto; } <img src="newimage.jpg" alt="Suni" class="center" /> but this merely gives me a syntax error, how do I go about fixing this? Thanks

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• Can you pass parameters for OnAction in MS Project VBA?

  - by Anne Schuessler

  The way I can define a method to be executed with OnAction in VBA with Microsoft Project is as follows (and works correctly): .OnAction = "Macro ""DoSomething""" ... where DoSomething is the method to execute. I would like to pass a parameter to that method but can't find a way to pass it with this syntax. Does anybody have an idea how to do this? I'm getting the feeling that this is an impossible task, but maybe there's some VBA secret I'm not aware of. Please note that VBA in MS Project seems to have its quirks and is slightly different than VBA for Excel or Access. This seems to be the case for the OnAction property which needs the extra Macro keyword to work correctly. If I'm wrong here please enlighten me.

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• Should I pass the BrainBench Design patterns certification?

  - by Fedyashev Nikita

  I have found Design patterns certification at the Brainbehch. I have heard from people who passed it, that there are many Language-specific patterns questions, mostly from Java and C++. I think that this certification can: force me to improve my skills on Object oriented design and design patterns; improve and structure my knowledge of the domain; give real estimate of my knowledge, which is useful issue itself The only confusion I have about this certification, is that I have to learn C++/Java language specific design patterns, while I mostly do PHP development and don't want to switch to C++/Java. I'm familiar with Java & C++ syntax, read lots of books about different subjects with code snippets in this programming languages. I think, that if I pass well all concepts except language specific patterns at certification, it won't be very good, because this concepts will gain quite low results. What would you recommend in this particular circumstance?

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• Why Does TFS Allow Orphaned Content and How Do I Get Rid of It?

  - by Chad

  My TfsVersionControl database has grown to 40+ GB in size. We recently did a TFS Destroy on a folder tree that should have cleared up at least 10 GB but instead it seemed to have no effect. When I look at the tables in TfsVersionControl, I am first shocked to see that there are no foreign keys at all in the database. Running a few queries, I see that there is some orphaning going on: tbl_Content has 13.9 GB of records that don't have a related tbl_File record tbl_File and tbl_Content have 2.4 GB that don't have a related tbl_Namespace record The cleanup job seems to be running nightly (prc_DeleteUnusedContent) and running it against the database manually doesn't remove any orphans. I see in the log for the cleanup job that it failed on 3/16, which is the morning after I destroyed the large amount of data. The error was due to a full transaction log. Could that error be the reason I'm left with all this orphaned data that can't be deleted? How can I permanently destroy this unneeded content?

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• Why Are Ruby Programmers So Full of Themselves? [closed]

  - by Pierreten

  I've noticed this culture surrounding Ruby where developers truly believe that they are somehow more gifted than developers of other languages, regardless of experience and talent (even when that isn't the case, I've met some extremely junior Ruby developers come up with some pretty basic constructs, and pass them off as some sort of revolutionary idea). The derision of strongly typed languages seems to be a common theme as well; regardless of its merits. Is there something particular to the Ruby syntax in general that is to account for this? Is there a socialogical component to it?

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• What could possibly cause this error(when declaring an object inside a class) ? //noobie question

  - by M4design

  I'm battling with this assignment :) I've got two classes: Ocean and Grid. When I declare an object of the Grid inside the Ocean: unsigned int sharkCount; Grid grid; The compiler/complainer says: error C2146: syntax error : missing ';' before identifier 'grid' Can you possibly predict what produces this error with the limited info' I provided? It seems that as if the Ocean doesn't like the Grid class. Could this be because of the poor implementation of the grid class. BTW the Grid has a default constructor. Yet the error happens in compiling time!. Thanks. EDIT: They're each in separate header file, and I've included the Grid.h in the Ocean.h.

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• A tool to determine jar dependencies based on existing code?

  - by geoffeg

  Is there a tool that can determine .jar dependencies given a directory of .jar files and a separate directory of java source code? I need to generate Eclipse .classpath files based on an existing code base that doesn't have any dependencies defined. To be more specific, I've been given a large codebase consisting of a dozen or so J2EE-style projects and a single directory of jar files. My client uses a custom development and build framework that is just too arcane for me to use and get any real work done. The projects do not have any information about their dependencies, either between projects or to jar libraries. I would expect this tool would have to spin through each jar file, indexing the classes available in that file and then go through each file in the project source code tree and match up the dependencies, possibly writing out a .classpath file with the required jar files. I realize this is a rather simplistic view of the operation, as duplicate classes among the jar files and such might make things more difficult.

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• Is file_get_contents multi line?

  - by Abs

  Hello all, Does file_get_contents maintain line breaks? I thought it did but I have tried this: if($conn){ $tsql = file_get_contents('scripts/CreateTables/SLR05_MATCH_CREATETABLES.sql'); $row = sqlsrv_query($conn, $tsql); print_r(sqlsrv_errors()); } The errors I get is that SQL Server complains that there is incorrect syntax. I get the same errors when I run the SQL Script without any line breaks, which suggests file_get_contents removes them? When I run the script normally (open the file in SQL Server Management Studio) and execute it, it works perfectly. So is there something that I can use that maintains line breaks etc? Or is there another problem here in using queries from a file with the SQL Server PHP Driver from Microsoft? Thanks all for any help

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