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  • How does a "Variables introduce state"?

    - by kunj2aan
    I was reading the "C++ Coding Standards" and this line was there: Variables introduce state, and you should have to deal with as little state as possible, with lifetimes as short as possible. Doesn't anything that mutates eventually manipulate state? What does "you should have to deal with little state as possible" mean? In an impure language such as C++, isn't state management really what you are doing? And what are other ways to "deal with as little state as possible" other than limiting variable lifetime?

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  • Characteristics and Common Usage Scenarios of SSIS Variables

    SQL Server Integration Services' primary purpose is to serve as a database development platform. As such, it is subject to standard best practices of software programming, which among other recommendations, advocate reusability. Realizing this objective in SSIS frequently involves the use of variables. Their characteristics and most common usage scenarios will be the primary subject of our presentation.

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  • Using Server Variables in ASP.NET 3.5

    If you are an ASP.NET developer you may notice from your day-to-day job in developing websites that there is some functionality that you need in order to complete specific website tasks. For example you may need to know the IP address of a specific visitor or the browser they re using or even where they re coming from. These questions can be answered by knowing how to use Server Variables in ASP.NET 3.5.... Cloud Servers in Demand - GoGrid Start Small and Grow with Your Business. $0.10/hour

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  • Google Analytics: Custom variables issue difference in data

    - by Bart
    We’ve set up tracking through custom variables in Google Analytics to measure which offices are getting the most traffic. The custom var consists out of the key (=office) and value = (office name). In our Custom Var tab in audience we get no data (actually we got 1 hit, but we think the data is way off). When we setup advanced segments with the filters on key and value we get the correct data. Now we are wondering why we aren’t getting that data in the custom var tab.

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  • Declaring variables in SQL

    - by Tim Hibbard
    I would like to blog more about the problems I encounter on a daily basis.  I find that taking 10 minutes or so to write a simple solution to my problems helps me retain that information. I always forget the specific syntax to declaring variables in T-SQL.  declare @startdate datetime; declare @enddate datetime;   set @startdate = '04/01/2010'; set @enddate = '04/30/2010';   select count(id) from triphistory where tripdate between @startdate and @enddate

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  • MATLAB is changing variables when I do not want it to.

    - by WVUstudent
    Here is my problem in a small bit of code used as an example, trial(0) function [] = trial(test) disp(test) if(test == 1) disp('test is one') test = 0; end disp(test) Matlab prints out this: 0 'test is one' 0 This is not my real code, there are over 500 lines of it, but this is a section of my code where the problem has risen. I have used the search function to see if I have been incrementing any variables anywhere, and have put in over 2 hours trying to see why MATLAB is changing my variables when I don't want it to.

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  • Is there a way to inspect all controller variables at once in Rails?

    - by m.u.sheikh
    I am exploring an big controller method, with about 10 or so instance variables. Some of them are set in before_filter methods, and some others inside the method itself. I want to inspect them with puts, but dont want to write all of them out example: puts "var1: #{@var1.inspect}....var15: #{@var15.inspect}" Is there a generic method that will display all the instance variables with an @ sign set so far in the current method? If not, what is the next best way to inspect all of them at once without having to write all of them in a puts statement?

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  • Windows 7 PATH not expanding

    - by trinithis
    I am using the following to create and edit environment variables for Windows 7. Control Panel\All Control Panel Items\System -> Advanced system settings -> Environment Variables Under System variables I have the following pertinant variables: PROG32=C:\Program Files (x86) REALDWG_SDK_DIR=%PROG32%\Autodesk\RealDWG 2011 Path=%REALDWG_SDK_DIR%;%PROG32%\Haskell\bin However, the following happens: C:\>echo %PROG32% C:\Program Files (x86) C:\>echo %Path% %REALDWG_SDK_DIR%;C:\Program Files (x86)\Haskell\bin Is it possible to have a chain of variables expand? If I rename Path to something else, I sometimes get the problem, and sometimes I don't.

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  • why the global variable value is not being set?

    - by masato-san
    I can't figure out why my global variable workRegionCode is not set properly. In function getWorkRegion(), after getting ajax callback, it attempt to set workRegionCode global variable. (inside of function setFirstIndexWorkRegionCode() ). The alert in setFirstIndexWorkRegionCode() outputs expected value like 401 or 123 etc. But then when getMachines() is called, the global variable workRegionCode is undefiend :( This js starts from window.onload() (please ignore those Japanese JSON key value and few Japanese variables. They are harmless) Code: var workRegionDropdown = document.getElementById("workRegionDropdown");; var machineDropdown = document.getElementById("machineDropdown"); //this is the global variable with problem..... var workRegionCode; //INIT window.onload = function() { getWorkRegions(); // alert("before: " + window.workRegionCode); getMachines(); // alert("after: " + window.workRegionCode); } function addWorkRegionToDropdown(jsonObject, dropdown) { for(var i=0, j=jsonObject.length; i<j; i++) { var option = document.createElement("option"); option.text = jsonObject[i].?????? + ":" + jsonObject[i].??????; option.value = jsonObject[i].??????; dropdown.options.add(option); } } function addMachineToDropdown(jsonObject, dropdown) { for(var i=0, j=jsonObject.length; i<j; i++) { var option = document.createElement("option"); option.text = jsonObject[i].???; option.value = jsonObject[i].???; dropdown.options.add(option); } } function getMachines() { //!!!!!!!!!!! workRegionCode is undefined.. why?!?!?! alert("inside of getMachines() ==> " + window.workRegionCode); var ajaxRequest = new XMLHttpRequest(); ajaxTimeout = setTimeout(function() {timeoutAjax(ajaxRequest, "showMessage")}, "5000"); ajaxRequest.onreadystatechange = function() { if(ajaxRequest.readyState == 4 ) { clearTimeout(ajaxTimeout); switch ( ajaxRequest.status ) { case 200: var jsonOut = JSON.parse(ajaxRequest.responseText); addMachineToDropdown(jsonOut.??, machineDropdown); break; default: document.getElementById("showMessage").innerHTML = ajaxRequest.responseText; } } } var aMonthAgo = new Date(); with(aMonthAgo) { setMonth(getMonth() - 1) } aMonthAgo = aMonthAgo.getYYYYMMDD(); var ??? = "29991231"; var url = "../resources/machine/list/" + window.workRegionCode + "/" + aMonthAgo + "/" + ???; ajaxRequest.open("GET", url, true); ajaxRequest.send(null) } function getWorkRegions() { var ajaxRequest = new XMLHttpRequest(); ajaxTimeout = setTimeout(function() {timeoutAjax(ajaxRequest, "showMessage")}, "5000"); ajaxRequest.onreadystatechange = function() { if(ajaxRequest.readyState == 4 ) { clearTimeout(ajaxTimeout); switch ( ajaxRequest.status ) { case 200: var jsonOut = JSON.parse(ajaxRequest.responseText); //set global variable workRegionCode setFirstIndexWorkRegionCode(jsonOut); addWorkRegionToDropdown(jsonOut.???, workRegionDropdown); default: document.getElementById("showMessage").innerHTML = ajaxRequest.responseText; } } } var url = "../resources/workshop/list"; ajaxRequest.open("GET", url, true); ajaxRequest.send(null) }//end getWorkRegions() function setFirstIndexWorkRegionCode(jsonString) { //here I set the value to work region code! window.workRegionCode = jsonString.???[0].??????; alert("??????: " + window.workRegionCode); }

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  • Prefer class members or passing arguments between internal methods?

    - by geoffjentry
    Suppose within the private portion of a class there is a value which is utilized by multiple private methods. Do people prefer having this defined as a member variable for the class or passing it as an argument to each of the methods - and why? On one hand I could see an argument to be made that reducing state (ie member variables) in a class is generally a good thing, although if the same value is being repeatedly used throughout a class' methods it seems like that would be an ideal candidate for representation as state for the class to make the code visibly cleaner if nothing else. Edit: To clarify some of the comments/questions that were raised, I'm not talking about constants and this isn't relating to any particular case rather just a hypothetical that I was talking to some other people about. Ignoring the OOP angle for a moment, the particular use case that I had in mind was the following (assume pass by reference just to make the pseudocode cleaner) int x doSomething(x) doAnotherThing(x) doYetAnotherThing(x) doSomethingElse(x) So what I mean is that there's some variable that is common between multiple functions - in the case I had in mind it was due to chaining of smaller functions. In an OOP system, if these were all methods of a class (say due to refactoring via extracting methods from a large method), that variable could be passed around them all or it could be a class member.

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  • Monitor ASP.NET Session State Variables

    - by Dave Johnson
    We are running a number of ASP.NET applications on W2K3 Server and IIS 6.0, and are looking for a way to be able to monitor ASP.NET session state variables (InProc) that are stored in memory. We are thinking there may be some memory optimization opportunities with some of these session state variables potentially consuming large amounts of RAM. Is there a way to accomplish this through IIS or Windows rather than instrumenting all of the individual Web apps with code to monitor the session state variables?

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  • Is there a difference between "." and "source" in bash, after all?

    - by ysap
    I was looking for the difference between the "." and "source" builtin commands and a few sources (e.g., in this discussion, and the bash manpage) suggest that these are just the same. However, following a problem with environment variables, I conducted a test. I created a file testenv.sh that contains: #!/bin/bash echo $MY_VAR In the command prompt, I performed the following: > chmod +x testenv.sh > MY_VAR=12345 > ./testenv.sh > source testenv.sh 12345 > MY_VAR=12345 ./testenv.sh 12345 [note that the 1st form returned an empty string] So, this little experiment suggests that there is a difference after all, where for the "source" command, the child environment inherits all the variables from the parent one, where for the "." it does not. Am I missing something, or is this is an undocumented/deprecated feature of bash? [ GNU bash, version 4.1.5(1)-release (x86_64-pc-linux-gnu) ]

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  • Update Variable in TeamCity powershell script

    - by Jake Rote
    I am try to update an enviroment variable in teamcity using powershell code. But it does not update the value of the variable. How can i do this? My current code is (It gets the currentBuildNumber fine: $currentBuildNumber = "%env.currentBuildNumber%" $newBuildNumber = "" Write-Output $currentBuildNumber If ($currentBuildNumber.StartsWith("%MajorVersion%") -eq "True") { $parts = $currentBuildNumber.Split(".") $parts[2] = ([int]::Parse($parts[2]) + 1) + "" $newBuildNumber = $parts -join "." } Else { $newBuildNumber = '%MajorVersion%.1' } //What I have tried $env:currentBuildNumber = $newBuildNumber Write-Host "##teamcity[env.currentBuildNumber '$newBuildNumber']" Write-Host "##teamcity[setParameter name='currentBuildNumber' value='$newBuildNumber']"

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  • SFML 2.0 Too Many Variables in Class Preventing Draw To Screen

    - by Josh
    This is a very strange phenomenon to me. I have a class definition for a game, but when I add another variable to the class, the draw method does not print everything to the screen. It will be easier understood showing the code and output. Code for good draw output: class board { protected: RectangleShape rect; int top, left; int i, j; int rowSelect, columnSelect; CircleShape circleArr[4][10]; CircleShape codeArr[4]; CircleShape keyArr[4][10]; //int pegPresent[4]; public: board(void); void draw(RenderWindow& Window); int mouseOver(RenderWindow& Window); void placePeg(RenderWindow& Window, int pegSelect); }; Screen: Code for missing draw: class board { protected: RectangleShape rect; int top, left; int i, j; int rowSelect, columnSelect; CircleShape circleArr[4][10]; CircleShape codeArr[4]; CircleShape keyArr[4][10]; int pegPresent[4]; public: board(void); void draw(RenderWindow& Window); int mouseOver(RenderWindow& Window); void placePeg(RenderWindow& Window, int pegSelect); }; Screen: As you can see, all I do is un-comment the protected array and most of the pegs are gone from the right hand side. I have checked and made sure that I didn't accidentally created a variable with that name already. I haven't used it anywhere. Why does it not draw the remaining pegs as it should? My only thought is that maybe I am declaring too many variables for the class, but that doesn't really make sense to me. Any thoughts and help is greatly appreciated.

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  • Parent Package Variable Configuration and Logging

    In SSIS, when we use 'parent package variable configuration' the order of event execution is quite different than the normal execution order. In this article we will see what the impact on execution order when we use 'parent package variable configuration'. SQL Backup Pro wins Gold Community Choice AwardFind out why the SQL Server Community voted SQL Backup Pro 'Best Backup and Recovery Product 2012'. Get faster, smaller, fully verified backups. Download a free trial now.

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  • How do I access variables with hyphenated names in Smarty?

    - by abeger
    I've got a PHP page that parses an XML file with SimpleXml, then passes that object to a Smarty template. My problem is that the XML file has hyphens in its tag names, e.g. video-player. In PHP, this is no problem, I just use $xml->{'video-player'} and everything's fine. Smarty, on the other hand, throws a fit when I try to use that syntax. The only solution I've come up with so far is to use a variable to store the name, e.g., { assign var=name value="video-player" } { $xml->$name } But this isn't terribly graceful to say the least. Is there another, better, approach to referring to a hyphenated variable name in Smarty?

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  • PHPMailer safe practices - Send escaped / sanitized variables or not ?

    - by FreekOne
    I'm using the PHPMailer-Lite class to build an email sending script and I'm not sure if I should use addslashses() on the $name variable when adding it to the constructor. If somebody's last name would be O'Riley (or any other name that contains characters which should normally be sanitized before handling) and I would send it unescaped, wouldn't it mess with the script/email sending ? Is it safe to send it unescaped ? As a side note, I would also like to avoid having my message body say "Hello, O\'Riley". Looking at the source, I saw that it only trims the whitespace and line ending (\r\n) characters from the received $name variable, so any advice on this would be more than welcome. Thank you all in advance !

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  • How to store local variables in jQuery click functions?

    - by Geuis
    I'm trying to figure out how to store external variable values in the functions created during jQuery's click() event. Here's a sample of the code I'm working with now. for(var i=0; i<3; i++){ $('#tmpid'+i).click(function(){ var gid = i; alert(gid); }); } <div id="tmpid0">1al</div> <div id="tmpid1">asd</div> <div id="tmpid2">qwe</div> So what's happening is that the events are attaching properly, but the value of 'gid' is always the last incremented value of 'i'. I'm not sure how to setup the private variable in this situation.

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  • PHP and Apache environment variables

    - by Simon
    Hello, I want to pass an environment variable in linux to apache on start up. export MYVAR=5 --I define my environment variable on the command line PassEnv MYVAR --set apache to import the variable in apache config file apachectl restart --when I restart apache I don't get an error message. However I have noticed that if I do not create the environment variable in my first step, I get a warning message, so must be working here echo $_SERVER['MYVAR'] --i try to access the environment variable within PHP but it is not defined I've observed that if I try to PassEnv an environment variable that already exits (one that I havn't created myself) it works fine. The SetEnv directive also works fine. I'd really like to pass an environment variable to apache on the fly without writing it in a file. Help much appreciated. I'm using CentOS, PHP5 and Apache2. Thanks.

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  • Why does the Java compiler complain about a local variable not having been initialized here?

    - by pele
    int a = 1, b; if(a > 0) b = 1; if(a <= 0) b = 2; System.out.println(b); If I run this, I receive: Exception in thread "main" java.lang.Error: Unresolved compilation problem: The local variable b may not have been initialized at Broom.main(Broom.java:9) I know that the local variables are not initialized and is your duty to do this, but in this case, the first if doesn't initialize the variable?

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