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  • Passing enums to functions in C++

    - by rocknroll
    Hi all, I have a header file with all the enums listed (#ifndef #define #endif construct has been used to avoid multiple inclusion of the file) that I use in multiple cpp files in my application.One of the enums in the files is enum StatusSubsystem {ENABLED,INCORRECT_FRAME,INVALID_DATA,DISABLED}; There are functions in the application delcared as ShowStatus(const StatusSubsystem&); Earlier in the application when I made calls to the above function like ShowStatus(INCORRECT_FRAME); my application used to compile perfectly. But after some code was added The compilation halts giving the following error: File.cpp:71: error: invalid conversion from `int' to `StatusSubsystem' File.cpp:71: error: initializing argument 1 of `void Class::ShowStatus(const StatusSubsystem&) I checked the code for any conflicting enums in the new code and it looked fine. My Question is what is wrong with the function call that compiler shows as erroneous? For your reference the function definition is: void Class::ShowStatus(const StatusSubsystem& eStatus) { QPalette palette; mStatus=eStatus;//store current Communication status of system if(eStatus==DISABLED) { //select red color for label, if it is to be shown disabled palette.setColor(QPalette::Window,QColor(Qt::red)); mLabel->setText("SYSTEM"); } else if(eStatus==ENABLED) { //select green color for label,if it is to be shown enabled palette.setColor(QPalette::Window,QColor(Qt::green)); mLabel->setText("SYSTEM"); } else if(eStatus==INCORRECT_FRAME) { //select yellow color for label,to show that it is sending incorrect frames palette.setColor(QPalette::Window,QColor(Qt::yellow)); mLabel->setText("SYSTEM(I)"); } //Set the color on the Label mLabel->setPalette(palette); } A strange side effect of this situation is it compiles when I cast all the calls to ShowStatus() as ShowStatus((StatusSubsystem)INCORRECT_FRAME); Though this removes any compilation error, but a strange thing happens. Though I make call to INCORRECT_FRAME above but in function definition it matches with ENABLED. How on earth is that possible? Its like while passing INCORRECT_FRAME by reference, it magically converts to ENABLED, which should be impossible. This is driving me nuts. Can you find any flaw in what I am doing? or is it something else? The application is made using C++,Qt-4.2.1 on RHEL4. Thanks.

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  • How to write my own global lock / unlock functions for PostgreSQL

    - by rafalmag
    I have postgresql (in perlu) function getTravelTime(integer, timestamp), which tries to select data for specified ID and timestamp. If there are no data or if data is old, it downloads them from external server (downloading time ~300ms). Multiple process use this database and this function. There is an error when two process do not find data and download them and try to do an insert to travel_time table (id and timestamp pair have to be unique). I thought about locks. Locking whole table would block all processes and allow only one to proceed. I need to lock only on id and timestamp. pg_advisory_lock seems to lock only in "current session". But my processes uses their own sessions. I tried to write my own lock/unlock functions. Am I doing it right? I use active waiting, how can I omit this? Maybe there is a way to use pg_advisory_lock() as global lock? My code: CREATE TABLE travel_time_locks ( id_key integer NOT NULL, time_key timestamp without time zone NOT NULL, UNIQUE (id_key, time_key) ); ------------ -- Function: mylock(integer, timestamp) DROP FUNCTION IF EXISTS mylock(integer, timestamp) CASCADE; -- Usage: SELECT mylock(1, '2010-03-28T19:45'); -- function tries to do a global lock similar to pg_advisory_lock(key, key) CREATE OR REPLACE FUNCTION mylock(id_input integer, time_input timestamp) RETURNS void AS $BODY$ DECLARE rows int; BEGIN LOOP BEGIN -- active waiting here !!!! :( INSERT INTO travel_time_locks (id_key, time_key) VALUES (id_input, time_input); EXCEPTION WHEN unique_violation THEN CONTINUE; END; EXIT; END LOOP; END; $BODY$ LANGUAGE 'plpgsql' VOLATILE COST 1; ------------ -- Function: myunlock(integer, timestamp) DROP FUNCTION IF EXISTS myunlock(integer, timestamp) CASCADE; -- Usage: SELECT myunlock(1, '2010-03-28T19:45'); -- function tries to do a global unlock similar to pg_advisory_unlock(key, key) CREATE OR REPLACE FUNCTION myunlock(id_input integer, time_input timestamp) RETURNS integer AS $BODY$ DECLARE BEGIN DELETE FROM ONLY travel_time_locks WHERE id_key=id_input AND time_key=time_input; RETURN 1; END; $BODY$ LANGUAGE 'plpgsql' VOLATILE COST 1;

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  • Calling back a functions value

    - by Jason Kelly
    I need your help, I cannot, for the life of me, figure this out. I've had my head wrapped around it only to no avail. Ideally, i'd like to setup two functions. 1 function: select_date() to interact with the user to select a date from the jQuery Date picker. If the dialog is closed then return as null. Then a second function: test() to check wether or not a date was picked/selected.' Here's my delema, when the function test() is executed, an alert box pops up and says "undefined" which means, I never get to select a date and it always being "undefined" I dont see what I am doing wrong here and everything seems logical to me. <!DOCTYPE html> <html> <head> <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.js"></script> <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/jquery-ui.js"></script> <script type="text/javascript"> function select_date() { var sdate $('#dd').dialog({ autoOpen: true, modal: true, overlay: { opacity: 0.5, background: 'black' }, title: "title", height: 265, width: 235, draggable: false, resizable: false }); $('#d1').datepicker({ onSelect: function () { $("#dd").dialog("close"); } }); return sdate } function test() { var x = select_date() alert(x) } </script> <style type="text/css"> #d1 {font-size:64%;} </style> </head> <body> <div id="dd"> <div id="d1"> </div> </div> <a href="javascript:test()">test</a> </body> </html>

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  • validation functions in google apps script is not working properly

    - by chocka
    I create a i/p form in google site using Apps Script and i did the validation using the Apps Script coding. Validation functions available in Apps script is not satisfying all the possibility of checking the error. function validate(e) { var app = UiApp.getActiveApplication(); var flag=0; var text = app.getElementById('name'); var textrequired = app.getElementById('namerequired'); var number = app.getElementById('number'); var numberrequired = app.getElementById('numberrequired'); var email = app.getElementById('email'); var emailrequired = app.getElementById('emailrequired'); var submit = app.getElementById('submit_button'); var valid = app.createClientHandler() .validateNumber(number) .validateNotInteger(text) .validateEmail(email) .forTargets(submit).setEnabled(true) .forTargets(number,text,email).setStyleAttribute("color","black") .forTargets(numberrequired,textrequired,emailrequired).setText('*').setStyleAttribute("color", "red").setVisible(true); var invalidno = app.createClientHandler().validateNotNumber(number).validateMatches(number, '').forTargets(number).setStyleAttribute("color", "red").forTargets(submit).setEnabled(false).forTargets(numberrequired).setText('Please Enter a Valid No.').setStyleAttribute("color", "red").setVisible(true); var validno = app.createClientHandler().validateNumber(number).forTargets(number).setStyleAttribute("color","black").forTargets(numberrequired).setText('*').setStyleAttribute("color", "red").setVisible(true); var invalidText=app.createClientHandler().validateNumber(text).validateMatches(text, '').forTargets(text).setStyleAttribute("color", "red").forTargets(submit).setEnabled(false).forTargets(textrequired).setText('Please Enter a Valid Name.').setStyleAttribute("color", "red").setVisible(true); var validText=app.createClientHandler().validateNotNumber(text).forTargets(text).setStyleAttribute("color","black").forTargets(textrequired).setText('*').setStyleAttribute("color", "red").setVisible(true); var invalidemail=app.createClientHandler().validateNotEmail(email).validateMatches(email, '').forTargets(email).setStyleAttribute("color", "red").forTargets(submit).setEnabled(false).forTargets(emailrequired).setText('Please Enter a Valid Mail-Id.').setStyleAttribute("color", "red").setVisible(true); var validemail=app.createClientHandler().validateEmail(email).forTargets(email).setStyleAttribute("color","black").forTargets(emailrequired).setText('*').setStyleAttribute("color", "red").setVisible(true); number.addKeyPressHandler(invalidno).addKeyPressHandler(validno).addKeyPressHandler(valid).addKeyPressHandler(invalidText).addKeyPressHandler(invalidemail); text.addKeyPressHandler(invalidText).addKeyPressHandler(validText).addKeyPressHandler(valid).addKeyPressHandler(invalidno).addKeyPressHandler(invalidemail); email.addKeyPressHandler(invalidemail).addKeyPressHandler(validemail).addKeyPressHandler(valid).addKeyPressHandler(invalidno).addKeyPressHandler(invalidText); if (text == ''){flag = 1;} if (email == ''){flag = 1;} if (number == ''){flag = 1;} if(flag == 1){submit.setEnabled(false);} return app; } I just placed my Validation function using Apps Script. I don't know why its not satisfying all the possibilities of the validation. And also i have to do is to enable the submit button after all the fields satisfy the validation. After once it enabled, if i make any error in any field it will not get disable correctly. I wrote the coding correctly i think so. Please take a look at my validation function and give me some suggestion to make it possible. Please guide me, Thanks & Regards, chocka.

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  • How to call a set of variables functions based on class on a group of elements

    - by user1547007
    I have the following html code: <i class="small ele class1"></i> <i class="medium ele class1"></i> <i class="large ele class1"></i> <div class="clear"></div> <i class="small ele class2"></i> <i class="medium ele class2"></i> <i class="large ele class2"></i> <div class="clear"></div> <i class="small ele class3"></i> <i class="medium ele class3"></i> <i class="large ele class3"></i> <div class="clear"></div> <i class="small ele class4"></i> <i class="medium ele class4"></i> <i class="large ele class4"></i>? And my javascript looks like so: var resize = function(face, s) { var bb = face.getBBox(); console.log(bb); var w = bb.width; var h = bb.height; var max = w; if (h > max) { max = h; } var scale = s / max; var ox = -bb.x+((max-w)/2); var oy = -bb.y+((max-h)/2); console.log(s+' '+h+' '+bb.y); face.attr({ "transform": "s" + scale + "," + scale + ",0,0" + "t" + ox + "," + oy }); } $('.ele').each(function() { var s = $(this).innerWidth(); var paper = Raphael($(this)[0], s, s); var face = $(this).hasClass("class1") ? class1Generator(paper) : class4Generator(paper); /*switch (true) { case $(this).hasClass('class1'): class1Generator(paper); break; case $(this).hasClass('class2'): class2Generator(paper) break; case $(this).hasClass('class3'): class3Generator(paper) break; case $(this).hasClass('class4'): class4Generator(paper) break; }*/ resize(face, s); }); my question is, how could I make this line of code more scalable? I tried using a switch but The script below is calling two functions if one of the elements has a class, but what If i have 10 classes? I don't think is the best solution I created a jsFiddle http://jsfiddle.net/7uUgz/6/ //var face = $(this).hasClass("awesome") ? awesomeGenerator(paper) : awfulGenerator(paper);

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  • PHP resized image functions and S3 upload functions - but how to merge the two?

    - by chocolatecoco
    I am using S3 to store images and I am resizing and compressing images before it gets uploaded using PHP. I'm using this class for storing the images to an S3 bucket - http://undesigned.org.za/2007/10/22/amazon-s3-php-class This all works fine if I'm not doing any file processing before the file is uploaded because it reads the file upload from the $_FILES array. The problem is I am resizing and compressing the image before storing to the S3 bucket. So I'm no longer able to read from the $_FILES array. The functions for resizing: public function resizeImage($newWidth, $newHeight, $option="auto") { // *** Get optimal width and height - based on $option $optionArray = $this->getDimensions($newWidth, $newHeight, $option); $optimalWidth = $optionArray['optimalWidth']; $optimalHeight = $optionArray['optimalHeight']; // *** Resample - create image canvas of x, y size $this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight); imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height); // *** if option is 'crop', then crop too if ($option == 'crop') { $this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight); } } The script I am using to store the file after resizing and compressing to a local directory: public function saveImage($savePath, $imageQuality="100") { // *** Get extension $extension = strrchr($savePath, '.'); $extension = strtolower($extension); switch($extension) { case '.jpg': case '.jpeg': if (imagetypes() & IMG_JPG) { imagejpeg($this->imageResized, $savePath, $imageQuality); } break; case '.gif': if (imagetypes() & IMG_GIF) { imagegif($this->imageResized, $savePath); } break; case '.png': // *** Scale quality from 0-100 to 0-9 $scaleQuality = round(($imageQuality/100) * 9); // *** Invert quality setting as 0 is best, not 9 $invertScaleQuality = 9 - $scaleQuality; if (imagetypes() & IMG_PNG) { imagepng($this->imageResized, $savePath, $invertScaleQuality); } break; // ... etc default: // *** No extension - No save. break; } imagedestroy($this->imageResized); } with this PHP code to invoke it: $resizeObj = new resize("$images_dir/$filename"); $resizeObj -> resizeImage($thumbnail_width, $thumbnail_height, 'crop'); $resizeObj -> saveImage($images_dir."/tb_".$filename, 90); How do I modify the code above so I can pass it through this function: $s3->putObjectFile($thefile, "s3bucket", $s3directory, S3::ACL_PUBLIC_READ)

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  • What's the most efficient query?

    - by Aaron Carlino
    I have a table named Projects that has the following relationships: has many Contributions has many Payments In my result set, I need the following aggregate values: Number of unique contributors (DonorID on the Contribution table) Total contributed (SUM of Amount on Contribution table) Total paid (SUM of PaymentAmount on Payment table) Because there are so many aggregate functions and multiple joins, it gets messy do use standard aggregate functions the the GROUP BY clause. I also need the ability to sort and filter these fields. So I've come up with two options: Using subqueries: SELECT Project.ID AS PROJECT_ID, (SELECT SUM(PaymentAmount) FROM Payment WHERE ProjectID = PROJECT_ID) AS TotalPaidBack, (SELECT COUNT(DISTINCT DonorID) FROM Contribution WHERE RecipientID = PROJECT_ID) AS ContributorCount, (SELECT SUM(Amount) FROM Contribution WHERE RecipientID = PROJECT_ID) AS TotalReceived FROM Project; Using a temporary table: DROP TABLE IF EXISTS Project_Temp; CREATE TEMPORARY TABLE Project_Temp (project_id INT NOT NULL, total_payments INT, total_donors INT, total_received INT, PRIMARY KEY(project_id)) ENGINE=MEMORY; INSERT INTO Project_Temp (project_id,total_payments) SELECT `Project`.ID, IFNULL(SUM(PaymentAmount),0) FROM `Project` LEFT JOIN `Payment` ON ProjectID = `Project`.ID GROUP BY 1; INSERT INTO Project_Temp (project_id,total_donors,total_received) SELECT `Project`.ID, IFNULL(COUNT(DISTINCT DonorID),0), IFNULL(SUM(Amount),0) FROM `Project` LEFT JOIN `Contribution` ON RecipientID = `Project`.ID GROUP BY 1 ON DUPLICATE KEY UPDATE total_donors = VALUES(total_donors), total_received = VALUES(total_received); SELECT * FROM Project_Temp; Tests for both are pretty comparable, in the 0.7 - 0.8 seconds range with 1,000 rows. But I'm really concerned about scalability, and I don't want to have to re-engineer everything as my tables grow. What's the best approach?

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  • Semi-generic function

    - by Fredrik Ullner
    I have a bunch of overloaded functions that operate on certain data types such as int, double and strings. Most of these functions perform the same action, where only a specific set of data types are allowed. That means I cannot create a simple generic template function as I lose type safety (and potentially incurring a run-time problem for validation within the function). Is it possible to create a "semi-generic compile time type safe function"? If so, how? If not, is this something that will come up in C++0x? An (non-valid) idea; template <typename T, restrict: int, std::string > void foo(T bar); ... foo((int)0); // OK foo((std::string)"foobar"); // OK foo((double)0.0); // Compile Error Note: I realize I could create a class that has overloaded constructors and assignment operators and pass a variable of that class instead to the function.

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  • How can multiple variables be passed to a function cleanly in C?

    - by aquanar
    I am working on an embedded system that has different output capabilities (digital out, serial, analog, etc). I am trying to figure out a clean way to pass many of the variables that will control those functions. I don't need to pass ALL of them too often, but I was hoping to have a function that would read the input data (in this case from a TCP network), and then parse the data (IE, the 3rd byte contains the states of 8 of the digital outputs (according to which bit in that byte is high or low)), and put that into a variable where I can then use elsewhere in the program. I wanted that function to be separate from the main() function, but to do so would require passing pointers to some 20 or so variables that it would be writing to. I know I could make the variables global, but I am trying to make it easier to debug by making it obvious when a function is allowed to edit that variable, by passing it to the function. My best idea was a struct, and just pass a pointer to it, but wasn't sure if there was a more efficient way, especially since there is only really 1 function that would need to access all of them at once, while most others only require parts of the information that will be stored in this bunch of state variables. So anyway, is there a clean way to send many variables between functions at once that need to be edited?

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  • EXCEL generate a character in one column of a row, only if other columns in the same row are not bl

    - by Simon
    My speadsheet keeps track of when patients leave a specific floor of the hospital. There are columns in which where each patient goes is documented (1 column for "home", another column for "rehab facility", another for "other floor", etc.). Only when the patient leaves the hospital altogether does it count as a discharge, in which case the “discharge” column needs to have something in it. What formula can I use to generate, say, an "x" in the "discharge" column if certain "where they went" columns in the same row contain something, but not if there is nothing in any of them? Currently, to accomplish this I am using =IF(OR(M30,N30,O30,P30,Q30,R30,S30),"x") in row 3 of the "discharge" column (rows 1 and 2 are headings), and I have used "fill down" in all subsequent rows. To suppress the "FALSE" this formula yields when the condition is not true, I have applied conditonal formatting to the entire column that if the value=FALSE then the font is white (same colour as background). Is there a more efficient, elegant and idiot-proof way of doing this? The conditional formatting of text colour could potentially confuse everyone but the person who built the spreadsheet (me).

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  • manuplating matrix operation(transpose, negation, addition, and mutipication) using functions in c

    - by user292489
    i was trying to manuplate matrices in my input file using functions. my input file is, A 3 3 1 2 3 4 5 6 7 8 9 B 3 3 1 0 0 0 1 0 0 0 1 C 2 3 3 5 8 -1 -2 -3 D 3 5 0 0 0 1 0 1 0 1 0 1 0 1 0 0 1 E 1 1 10 F 3 10 1 0 2 0 3 0 4 0 5 0 0 2 3 -1 -3 -4 -3 8 3 7 0 0 0 4 6 5 8 2 -1 10 i am having trouble in impementing the funcitons that i declared. i assumed my program will perform those operations: transpose, negate, add, and mutiply matices according to the users choise: /* once this program is compliled and excuted, it will perform the basic matrix operations: negation, transpose,a\ ddition, and multiplication. */ #include <stdio.h> #include <stdlib.h> #define MAX 10 int readmatrix(FILE *input, char martixname[6],int , mat[10][10], int i, int j); void printmatrix(char matrixname[6], int mat[10][10], int i, int j); void Negate(char matrixname[6], int mat[10][10], int i, int j); void add(char matrixname[6], int mat[10][10],int i, int k); void multiply(char matrixname[], int mat[][10], char A[], int i, int k); void transpose (char matrixname[], int mat[][10], char A[], int); void printT(int mat[][10], int); int selctoption(); char selectmatrix(); int main(int argc, char *argv[]) { char matrixtype[6]; int mat[][10]; FILE *filein; int size; int optionop; int matrixop; int option; if (argc != 2) { printf("Usage: excutable input.\n"); exit (0); } filein = fopen(argv[1], "r"); if (!filein) { printf("ERROR: input file not found.\n"); exit (0); } size = readmatrix (filein, matrixtype); printmatrix(matrix[][10], size); option = selectoption(); matrixtype = selectmatrix(); //printf("You have: %5.2f ", deposit); optionop = readmatrix(option, matrix[][10], size); if (choiceop == 6) { printf("Thanks for using the matrix operation program.\n"); exit(0); } printf("Please select from the following matrix operations:\n") printf("\t1. Print matrix\n"); printf("\t2. Negate matrix\n"); printf("\t3. Transpose matrix\n"); printf("\t4. Add matrices\n"); printf("\t5. Multiply matrices\n"); printf("\t6. Quit\n"); fclose(filein); return 0; } do { printf("Please select option(1-%d):", optionop); scanf("%d", &matrixop); }while(matrixop <= 0 || matrixop > optionop); void readmatrix (FILE *in, int mat[][10], char A[], int i, int j) { int i=0,j = 0; while (fscanf(in, "%d", &mat[i][j]) != EOF) return 0; } // i would apprtaite anyones feedback. //thank you!

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  • finishing some functions in this code

    - by osabri
    i have problem to finish some functions in this code program lab4; var inFile : text; var pArray : array[1..10]of real; //array of 10 integer values containing patterns to search in a given set of numbers var rArray : array[1..10]of integer; //array containing result of pattern search, each index in rArray coresponds to number of occurences of //pattern from pArray in sArray. var sArray : array[1..100] of real; //array containing data read from file var accuracy : real; (****************************************************************************) function errMsg:integer; begin if ParamCount < 3 then begin writeln('Too few arguments'); writeln('Usage: ./lab4 lab4.txt <accuracy> <pattern_1> <pattern_2> <pattern_n>'); errMsg:=-1; end else if ParamCount > 12 then begin writeln('Too many arguments'); writeln('Maximum number of patterns is 10'); errMsg:=-1; end else begin assign(inFile,ParamStr(1)); {$I-} reset(inFile); if ioresult<>0 then begin writeln('Cannot open ',ParamStr(1)); errMsg:=-1; end else errMsg:=0; end; end; (****************************************************************************) procedure readPattern; var errPos,idx:integer; begin if errMsg=0 then begin for idx:=1 to ParamCount-2 do begin Val(ParamStr(idx+2),pArray[idx],errPos); writeln('pArray:',pArray[idx]:2:2); end; end; end; (****************************************************************************) procedure getAccuracy; //Function should get the accuracy as the first param (after the program name) begin (here where i stopped : (( ) end; (****************************************************************************) function readSet:integer; //Function returns number of elements read from file var idx,errPos:integer; var sChar: string; begin if errMsg=0 then begin idx:=1; repeat begin readln(inFile,sChar); VAL(sChar,sArray[idx],errPos); writeln('sArray:',sArray[idx]:2:2); idx:=idx+1; end until eof(inFile)=TRUE; end; readSet:=idx-1; end; (****************************************************************************) procedure searchPattern(sNumber:integer); //Function should search and count pattern(patterns) occurence in a given set what the best solution for this part?? (****************************************************************************) procedure dispResult; //Function should display the result of pattern(patterns) search begin (****************************************************************************) begin readPattern; getAccuracy; searchPattern(readSet); dispResult; end.

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  • C# Memoization of functions with arbitrary number of arguments

    - by Lirik
    I'm trying to create a memoization interface for functions with arbitrary number of arguments, but I'm failing miserably. The first thing I tried is to define an interface for a function which gets memoized automatically upon execution: class EMAFunction:IFunction { Dictionary<List<object>, List<object>> map; class EMAComparer : IEqualityComparer<List<object>> { private int _multiplier = 97; public bool Equals(List<object> a, List<object> b) { List<object> aVals = (List<object>)a[0]; int aPeriod = (int)a[1]; List<object> bVals = (List<object>)b[0]; int bPeriod = (int)b[1]; return (aVals.Count == bVals.Count) && (aPeriod == bPeriod); } public int GetHashCode(List<object> obj) { // Don't compute hash code on null object. if (obj == null) { return 0; } // Get length. int length = obj.Count; List<object> vals = (List<object>) obj[0]; int period = (int) obj[1]; return (_multiplier * vals.GetHashCode() * period.GetHashCode()) + length;; } } public EMAFunction() { NumParams = 2; Name = "EMA"; map = new Dictionary<List<object>, List<object>>(new EMAComparer()); } #region IFunction Members public int NumParams { get; set; } public string Name { get; set; } public object Execute(List<object> parameters) { if (parameters.Count != NumParams) throw new ArgumentException("The num params doesn't match!"); if (!map.ContainsKey(parameters)) { //map.Add(parameters, List<double> values = new List<double>(); List<object> asObj = (List<object>)parameters[0]; foreach (object val in asObj) { values.Add((double)val); } int period = (int)parameters[1]; asObj.Clear(); List<double> ema = TechFunctions.ExponentialMovingAverage(values, period); foreach (double val in ema) { asObj.Add(val); } map.Add(parameters, asObj); } return map[parameters]; } public void ClearMap() { map.Clear(); } #endregion } Here are my tests of the function: private void MemoizeTest() { DataSet dataSet = DataLoader.LoadData(DataLoader.DataSource.FROM_WEB, 1024); List<String> labels = dataSet.DataLabels; Stopwatch sw = new Stopwatch(); IFunction emaFunc = new EMAFunction(); List<object> parameters = new List<object>(); int numRuns = 1000; long sumTicks = 0; parameters.Add(dataSet.GetValues("open")); parameters.Add(12); // First call for(int i = 0; i < numRuns; ++i) { emaFunc.ClearMap();// remove any memoization mappings sw.Start(); emaFunc.Execute(parameters); sw.Stop(); sumTicks += sw.ElapsedTicks; } Console.WriteLine("Average ticks not-memoized " + (sumTicks/numRuns)); sumTicks = 0; // Repeat call for (int i = 0; i < numRuns; ++i) { sw.Start(); emaFunc.Execute(parameters); sw.Stop(); sumTicks += sw.ElapsedTicks; } Console.WriteLine("Average ticks memoized " + (sumTicks/numRuns)); } The performance is confusing me... I expected the memoized function to be faster, but it didn't work out that way: Average ticks not-memoized 106,182 Average ticks memoized 198,854 I tried doubling the data instances to 2048, but the results were about the same: Average ticks not-memoized 232,579 Average ticks memoized 446,280 I did notice that it was correctly finding the parameters in the map and it going directly to the map, but the performance was still slow... I'm either open for troubleshooting help with this example, or if you have a better solution to the problem then please let me know what it is.

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  • CodePlex Daily Summary for Thursday, December 30, 2010

    CodePlex Daily Summary for Thursday, December 30, 2010Popular ReleasesVarddienis - Windows Sidebar sikriks: Varddienis 0.9.5.0: Pievienota "Svetku" funkcija; Tiek paraditi Latvijas valsts svetki, atceres un atzimejamas dienas. Pievienoti “Atrie taustini” jeb isceli (laujot atrak izmantot Varddiena iespejas); Pievienota jauna poga - "Isceli", kas lauj lietotajam apskatit Varddieni pieejamos iscelus, un to taustinus. Nelielas izmainas: Nedaudz uzlabots JavaScript kods, Izmainits lidojošo logu aizveršanas krustinš – tagad tas klust dzeltens, ja uz ta uzbrauc ar peli; Ieverojami parkartoti un samazinati sik...SQL Monitor - tracking sql server activities: SQL Monitor 3.0 alpha 8: 1. added truncate table/defrag index/check db functions 2. improved alert 3. fixed problem with alert causing config file corrupted(hopefully)People's Note: People's Note 0.20: Version 0.20 is all about polishing the UI and supporting other developers. Several screens got better handling of the "close" button and the Escape key. The ink note screen got more traditional sketching colours, instead of the primaries. It also got a greater brush size. Messages for network errors have been improved. The Evernote API library got a Win32 target. Readme.txt was updated with additional instructions. To install: copy the appropriate CAB file onto your WM device and run i...ASP.NET Comet Ajax Library (Reverse Ajax - Server Push): Object Cache Sample: Object cache sample for Windows Forms Applications. This sample project demonstrates the usage of PCache class.Analysis Services Stored Procedure Project: 1.3.5 Release: This release includes the following fixes and new functionality: Updates to GetCubeLastProcessedDate to work with perspectives Fixes to reports that call Discover functions improving drillthrough functions against perspectives improving ExecuteDrillthroughAndFixColumns logic fixing situation where MDX query calling certain ASSP sprocs which opened external connections caused deadlock to SSAS processing small fix to Partition code when DbColumnName property doesn't exist changes...DocX: DocX v1.0.0.11: Building Examples projectTo build the Examples project, download DocX.dll and add it as a reference to the project. OverviewThis version of DocX contains many bug fixes, it is a serious step towards a stable release. Added1) Unit testing project, 2) Examples project, 3) To many bug fixes to list here, see the source code change list history.Cosmos (C# Open Source Managed Operating System): 71406: This is the second release supporting the full line of Visual Studio 2010 editions. Changes since release 71246 include: Debug info is now stored in a single .cpdb file (which is a Firebird database) Keyboard input works now (using Console.ReadLine) Console colors work (using Console.ForegroundColor and .BackgroundColor)AutoLoL: AutoLoL v1.5.0: Added the all new Masteries Browser which replaces the Quick Open combobox AutoLoL will now attemt to create file associations for mastery (*.lolm) files Each Mastery Build can now contain keywords that the Masteries Browser will use for filtering Changed the way AutoLoL detects if another instance is already running Changed the format of the mastery files to allow more information stored in* Dialogs will now focus the Ok or Cancel button which allows the user to press Return to clo...Paint.NET PSD Plugin: 1.6.0: Handling of layer masks has been greatly improved. Improved reliability. Many PSD files that previously loaded in as garbage will now load in correctly. Parallelized loading. PSD files containing layer masks will load in a bit quicker thanks to the removal of the sequential bottleneck. Hidden layers are no longer made visible on save. Many thanks to the users who helped expose the layer masks problem: Rob Horowitz, M_Lyons10. Please keep sending in those bug reports and PSD repro files!Razor Templating Engine: Razor Templating Engine v1.2: Changes: ADDED: Standard namespaces imports for all templates: System, System.Collections.Generic, System.Linq (Changeset 5635) ADDED: Methods for Precompilation (Changeset 3283) CHANGED: Refactored precompilation to be exposed per-TemplateService. (Changeset 3440) CHANGED: Added more descriptive compilation exception message. (Changeset 3629) FIXED: Forced reference to Microsoft.CSharp to correct support for testing frameworks. (Changeset 3689) FIXED: Added support for nested anonymous obj...Facebook C# SDK: 4.1.1: From 4.1.1 Release: Authentication bug fix caused by facebook change (error with redirects in Safari) Authenticator fix, always returning true From 4.1.0 Release Lots of bug fixes Removed Dynamic Runtime Language dependencies from non-dynamic platforms. Samples included in release for ASP.NET, MVC, Silverlight, Windows Phone 7, WPF, WinForms, and one Visual Basic Sample Changed internal serialization to use Json.net BREAKING CHANGE: Canvas Session is no longer supported. Use Signed...Catel - WPF and Silverlight MVVM library: 1.0.0: And there it is, the final release of Catel, and it is no longer a beta version!EnhSim: EnhSim 2.2.7 ALPHA: 2.2.7 ALPHAThis release supports WoW patch 4.03a at level 85 To use this release, you must have the Microsoft Visual C++ 2010 Redistributable Package installed. This can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=A7B7A05E-6DE6-4D3A-A423-37BF0912DB84 To use the GUI you must have the .NET 4.0 Framework installed. This can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992 - Mongoose has bee...LINQ to Twitter: LINQ to Twitter Beta v2.0.19: Mono 2.8, Silverlight, OAuth, 100% Twitter API coverage, streaming, extensibility via Raw Queries, and added documentation. Bug fixes.Euro for Windows XP: ChangeRegionalSettings 1..0: *Flickr Wallpaper Rotator (for Windows desktop): Wallpaper Flickr 1.1: Some minor bugfixes (mostly covering when network connection is flakey, so I discovered them all while at my parents' house for Christmas).NoSimplerAccounting: NoSimplerAccounting 6.0: -Fixed a bug in expense category report.NHibernate Mapping Generator: NHibernate Mapping Generator 2.0: Added support for Postgres (Thanks to Angelo)NewLife XCode: XCode v6.5.2010.1223 ????（????v3.5??）: XCode v6.5.2010.1223 ????，??： NewLife.Core ??? NewLife.Net ??? XControl ??? XTemplate ????，??C#?????? XAgent ???? NewLife.CommonEnitty ??????（???，XCode??????） XCode?? ?????????，??????????????????，?????95% XCode v3.5.2009.0714 ??，?v3.5?v6.0???????????????，?????????。v3.5???????????，??????????????。 XCoder ??XTemplate?????????，????????XCode??? XCoder_Src ???????（????XTemplate????），??????????????????Umbraco CMS: Umbraco 4.6 Beta - codename JUNO: The Umbraco 4.6 beta (codename JUNO) release contains many new features focusing on an improved installation experience, a number of robust developer features, and contains more than 89 bug fixes since the 4.5.2 release. Improved installer experience Updated Starter Kits (Simple, Blog, Personal, Business) Beautiful, free, customizable skins included Skinning engine and Skin customization (see Skinning Documentation Kit) Default dashboards on install with hide option Updated Login t...New ProjectsAlquerque.net: Quer mostrar todo seu potencial? Destacar sua idéia inovadora? Desenvolva uma solução na plataforma .NET e prove que você está preparado para o mercado!Buccaneer: Buccaneer is a very extensive version of the windows explorer, which can be even furter extended with selfmade plugins. It is developed in c#.Chianti: Project Chianticomputing pi with a webcam: computing pi with a webcam and a spinning plate using buffon's methodConfree for Outlook: Confree lets you create audio conferences from Claro / Telmex directly from Outlook.Esurfing: EsurfingFoursquare Helper for WebMatrix: The Foursquare Helper for WebMatrix makes it simple to integrate Foursquare in your site. With a few lines of code you'll be able to show an "Add to My Foursquare" button or show any user's badges in your site.GetSatisfaction Helper for WebMatrix: The GetSatisfaction Helper for WebMatrix allows you to easily integrate GetSatistaction feedback functionality into your site. It provides a set of widgets for your users to share their ideas, questions, problems, and praises.GoodStore: ??????????，??B/S??，asp.net?sqlserver???，???????，?????????。。。Groupon Helper for WebMatrix: The Groupon Helper for WebMatrix allows you to easily add a Groupon badge to your WebMatrix site. When the helper is in place, it can query the Groupon API to get the deals for a given location, for you to display them in new, different ways. HarrierSight: An extensible application for analyze of spatial dataiPlay: iPlay is a WPF application built using MVVM for generating iTunes playlists randomly and displaying the status of iTunes in a user friendly way. It's secondary purpose is to explore the capabilities of WPF and MVVM in a contextual way.iSun Studio CMS: SNS Kiiro: An easy to use collaboration and project management application built for SharePoint. Kiiro lets your team collaborate on projects, documents, discussions, tasks and issues all within a simple, easy-to-use interface.Kiva7: The Kiva7 app is a Windows Phone 7 app for www.kiva.com. It shows all information on your loans and allows you to search for new loans. LeanEngine Framework: The LeanEngine framework makes it easier and faster for developers to develop .Net data centric applications. It's developed in C# language.MedSpeech: Guardado de grabaciones sobre los estudios radiologicos para luego poder realizar reportes de estos.Open Gran Turismo: Open Gran Turismo is an opensource car racing game highly customizable developed in XNA and BEPU physics. Opt.Net: Command line options and arguments parsing library for .NET 3.5 and 4.0 programs. Uses reflection to convert command line arguments and options into property values on an object that the application defines. Will support command pattern programs as well.Plancast Helper for WebMatrix: The Plancast Helper for WebMatrix provides an easy way to integrate Plancast on your WebMatrix site. With a few lines of code you'll able to show your Plancast plans or the ones from your friends. Polldaddy Helper for WebMatrix: The Polldaddy helper makes easy to add Poll widgets, ratings and surveys to your WebMatrix site in a few lines of code. It also provides access to the Polldaddy API, wrapping some of the API methods to retrieve Poll data.Scribd Helper for WebMatrix: The Scribd Helper for WebMatrix allows you to easily add Scribd documents to your site. When the helper is in place, it interacts with the Scribd API and with Scribd Reader to easily list your documents, enabling users to view them without having to leave your site. SharePoint 2010 Custom List Form Demo: This example will show you how to create a custom list form for SharePoint 2010 in Visual Studio 2010 using SharePoint Designer 2010 and VS2010... See my blog for a "Walkthrough": http://ikarstein.wordpress.comTdd unit test bar for Windows Phone development: a simple application which launches NUnit-Console on your Windows Phone unit tests every time you build, using a SilverLight version of NUnit. The output is then colored for better readability: Green bar if success, Red bar if failure.Techne: Techne is a program which will take a user input of a color or picture and then using motors to pipette paint will manually create the colors described by the user and draw a picture. The goal is to continually expand the system into performing more complicated tasks.TelerikTest1: ????Telerik??111111111TriExporterNET: TriExporter .NET Twitter Helper for WebMatrix: The Twitter Helper for WebMatrix makes it simple to integrate several Twitter social features in your site. For example, you can display Twitter widgets like "Follow Me" and "Tweet" Buttons, and access the Timeline Resources exposed by the Twitter API in a few lines of code.windows azure backup: If you need to have a backup of your files using Windows Azure, then this is the project to download. It incorporates an "admin" user and his backups. Can upload/retrieve files from local hard drive. Made with ASP.NET MVC.WP7PrintHelper: This project is aimed at the Windows Phone 7 developers that need to print from an App they are developing. The project provides a WCF service that runs on any desktop or server, and a print dialog dll that runs on the Windows 7 phone. It is developed in Framework 4.0 Client C#Wufoo Helper for WebMatrix: The Wufoo Helper for WebMatrix provides an easy way to integrate Wufoo forms and data into your WebMatrix site. It allows you to add Wufoo forms in your pages and integrate the data submitted in your forms by using Web Hooks.

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  • C++ non-member functions for nested template classes

    - by beldaz
    I have been writing several class templates that contain nested iterator classes, for which an equality comparison is required. As I believe is fairly typical, the comparison is performed with a non-member (and non-friend) operator== function. In doing so, my compiler (I'm using Mingw32 GCC 4.4 with flags -O3 -g -Wall) fails to find the function and I have run out of possible reasons. In the rather large block of code below there are three classes: a Base class, a Composed class that holds a Base object, and a Nested class identical to the Composed class except that it is nested within an Outer class. Non-member operator== functions are supplied for each. These classes are in templated and untemplated forms (in their own respective namespaces), with the latter equivalent to the former specialised for unsigned integers. In main, two identical objects for each class are compared. For the untemplated case there is no problem, but for the templated case the compiler fails to find operator==. What's going on? #include <iostream> namespace templated { template<typename T> class Base { T t_; public: explicit Base(const T& t) : t_(t) {} bool equal(const Base& x) const { return x.t_==t_; } }; template<typename T> bool operator==(const Base<T> &x, const Base<T> &y) { return x.equal(y); } template<typename T> class Composed { typedef Base<T> Base_; Base_ base_; public: explicit Composed(const T& t) : base_(t) {} bool equal(const Composed& x) const {return x.base_==base_;} }; template<typename T> bool operator==(const Composed<T> &x, const Composed<T> &y) { return x.equal(y); } template<typename T> class Outer { public: class Nested { typedef Base<T> Base_; Base_ base_; public: explicit Nested(const T& t) : base_(t) {} bool equal(const Nested& x) const {return x.base_==base_;} }; }; template<typename T> bool operator==(const typename Outer<T>::Nested &x, const typename Outer<T>::Nested &y) { return x.equal(y); } } // namespace templated namespace untemplated { class Base { unsigned int t_; public: explicit Base(const unsigned int& t) : t_(t) {} bool equal(const Base& x) const { return x.t_==t_; } }; bool operator==(const Base &x, const Base &y) { return x.equal(y); } class Composed { typedef Base Base_; Base_ base_; public: explicit Composed(const unsigned int& t) : base_(t) {} bool equal(const Composed& x) const {return x.base_==base_;} }; bool operator==(const Composed &x, const Composed &y) { return x.equal(y); } class Outer { public: class Nested { typedef Base Base_; Base_ base_; public: explicit Nested(const unsigned int& t) : base_(t) {} bool equal(const Nested& x) const {return x.base_==base_;} }; }; bool operator==(const Outer::Nested &x, const Outer::Nested &y) { return x.equal(y); } } // namespace untemplated int main() { using std::cout; unsigned int testVal=3; { // No templates first typedef untemplated::Base Base_t; Base_t a(testVal); Base_t b(testVal); cout << "a=b=" << testVal << "\n"; cout << "a==b ? " << (a==b ? "TRUE" : "FALSE") << "\n"; typedef untemplated::Composed Composed_t; Composed_t c(testVal); Composed_t d(testVal); cout << "c=d=" << testVal << "\n"; cout << "c==d ? " << (c==d ? "TRUE" : "FALSE") << "\n"; typedef untemplated::Outer::Nested Nested_t; Nested_t e(testVal); Nested_t f(testVal); cout << "e=f=" << testVal << "\n"; cout << "e==f ? " << (e==f ? "TRUE" : "FALSE") << "\n"; } { // Now with templates typedef templated::Base<unsigned int> Base_t; Base_t a(testVal); Base_t b(testVal); cout << "a=b=" << testVal << "\n"; cout << "a==b ? " << (a==b ? "TRUE" : "FALSE") << "\n"; typedef templated::Composed<unsigned int> Composed_t; Composed_t c(testVal); Composed_t d(testVal); cout << "c=d=" << testVal << "\n"; cout << "d==c ? " << (c==d ? "TRUE" : "FALSE") << "\n"; typedef templated::Outer<unsigned int>::Nested Nested_t; Nested_t e(testVal); Nested_t f(testVal); cout << "e=f=" << testVal << "\n"; cout << "e==f ? " << (e==f ? "TRUE" : "FALSE") << "\n"; // Above line causes compiler error: // error: no match for 'operator==' in 'e == f' } cout << std::endl; return 0; }

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  • Autoconf -- including a static library (newbie)

    - by EB
    I am trying to migrate my application from manual build to autoconf, which is working very nicely so far. But I have one static library that I can't figure out how to integrate. That library will NOT be located in the usual library locations - the location of the binary (.a file) and header (.h file) will be given as a configure argument. (Notably, even if I move the .a file to /usr/lib or anywhere else I can think of, it still won't work.) It is also not named traditionally (it does not start with "lib" or "l"). Manual compilation is working with these (directory is not predictable - this is just an example): gcc ... -I/home/john/mystuff /home/john/mystuff/helper.a (Uh, I actually don't understand why the .a file is referenced directly, not with -L or anything. Yes, I have a half-baked understanding of building C programs.) So, in my configure.ac, I can use the relevant configure argument to successfully find the header (.h file) using AC_CHECK_HEADER. Inside the AC_CHECK_HEADER I then add the location to CPFLAGS and the #include of the header file in the actual C code picks it up nicely. Given a configure argument that has been put into $location and the name of the needed files are helper.h and helper.a (which are both in the same directory), here is what works so far: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"]) Where I run into difficulties is getting the binary (.a file) linked in. No matter what I try, I always get an error about undefined references to the function calls for that library. I'm pretty sure it's a linkage issue, because I can fuss with the C code and make an intentional error in the function calls to that library which produces earlier errors that indicate that the function prototypes have been loaded and used to compile. I tried adding the location that contains the .a file to LDFLAGS and then doing a AC_CHECK_LIB but it is not found. Maybe my syntax is wrong, or maybe I'm missing something more fundamental, which would not be surprising since I'm a newbie and don't really know what I'm doing. Here is what I have tried: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location"; AC_CHECK_LIB(helper)]) No dice. AC_CHECK_LIB is looking for -lhelper I guess (or libhelper?) so I'm not sure if that's a problem, so I tried this, too (omit AC_CHECK_LIB and include the .a directly in LDFLAGS), without luck: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location/helper.a"]) To emulate the manual compilation, I tried removing the -L but that doesn't help: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS $location/helper.a"]) I tried other combinations and permutations, but I think I might be missing something more fundamental....

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  • Autoconf -- building with static library (newbie)

    - by EB
    I am trying to migrate my application from manual build to autoconf, which is working very nicely so far. But I have one static library that I can't figure out how to integrate. That library will NOT be located in the usual library locations - the location of the binary (.a file) and header (.h file) will be given as a configure argument. (Notably, even if I move the .a file to /usr/lib or anywhere else I can think of, it still won't work.) It is also not named traditionally (it does not start with "lib" or "l"). Manual compilation is working with these (directory is not predictable - this is just an example): gcc ... -I/home/john/mystuff /home/john/mystuff/helper.a (Uh, I actually don't understand why the .a file is referenced directly, not with -L or anything. Yes, I have a half-baked understanding of building C programs.) So, in my configure.ac, I can use the relevant configure argument to successfully find the header (.h file) using AC_CHECK_HEADER. Inside the AC_CHECK_HEADER I then add the location to CPFLAGS and the #include of the header file in the actual C code picks it up nicely. Given a configure argument that has been put into $location and the name of the needed files are helper.h and helper.a (which are both in the same directory), here is what works so far: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"]) Where I run into difficulties is getting the binary (.a file) linked in. No matter what I try, I always get an error about undefined references to the function calls for that library. I'm pretty sure it's a linkage issue, because I can fuss with the C code and make an intentional error in the function calls to that library which produces earlier errors that indicate that the function prototypes have been loaded and used to compile. I tried adding the location that contains the .a file to LDFLAGS and then doing a AC_CHECK_LIB but it is not found. Maybe my syntax is wrong, or maybe I'm missing something more fundamental, which would not be surprising since I'm a newbie and don't really know what I'm doing. Here is what I have tried: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location"; AC_CHECK_LIB(helper)]) No dice. AC_CHECK_LIB is looking for -lhelper I guess (or libhelper?) so I'm not sure if that's a problem, so I tried this, too (omit AC_CHECK_LIB and include the .a directly in LDFLAGS), without luck: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location/helper.a"]) To emulate the manual compilation, I tried removing the -L but that doesn't help: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS $location/helper.a"]) I tried other combinations and permutations, but I think I might be missing something more fundamental....

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  • How can I use UML to model a relationship between two classes, where one has functions exposed as friend to the other?

    - by user1796528
    I have a two classes: ------------ --------------- X Y ------------ --------------- relation ------------ ------------------ --------------- A() C() B() D() E() ------------ --------------- I want to inherit just these two functions from X class, where they are defined with the friend access modifier. My class will be: --------------- Y --------------- --------------- C() A() D() --------------- Y class uses some functions of X class namely A and D. How can I model this relationship in a UML class diagram?

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  • Do I have to deliver my utility and helper code to clients?

    - by deviDave
    Over the years I've created a bunch of Java utility and helper libraries which I just attach to new projects. Then, when I deliver code to my clients, I send all the code except for the libraries themselves (not JARs but source code files). A client complained that he could not compile the project as some libraries were missing. I tried explaining him about my own libraries, but he was not satisfied. How do you handle such situations? I am still apporting changes to these libraries often and I cannot compile JARs each time I start working on some new project. How to overcome this issue - not to share private libraries (personal intellectual property) and have happy clients?

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  • Does OO, TDD, and Refactoring to Smaller Functions affect Speed of Code?

    - by Dennis
    In Computer Science field, I have noticed a notable shift in thinking when it comes to programming. The advice as it stands now is write smaller, more testable code refactor existing code into smaller and smaller chunks of code until most of your methods/functions are just a few lines long write functions that only do one thing (which makes them smaller again) This is a change compared to the "old" or "bad" code practices where you have methods spanning 2500 lines, and big classes doing everything. My question is this: when it call comes down to machine code, to 1s and 0s, to assembly instructions, should I be at all concerned that my class-separated code with variety of small-to-tiny functions generates too much extra overhead? While I am not exactly familiar with how OO code and function calls are handled in ASM in the end, I do have some idea. I assume that each extra function call, object call, or include call (in some languages), generate an extra set of instructions, thereby increasing code's volume and adding various overhead, without adding actual "useful" code. I also imagine that good optimizations can be done to ASM before it is actually ran on the hardware, but that optimization can only do so much too. Hence, my question -- how much overhead (in space and speed) does well-separated code (split up across hundreds of files, classes, and methods) actually introduce compared to having "one big method that contains everything", due to this overhead? UPDATE for clarity: I am assuming that adding more and more functions and more and more objects and classes in a code will result in more and more parameter passing between smaller code pieces. It was said somewhere (quote TBD) that up to 70% of all code is made up of ASM's MOV instruction - loading CPU registers with proper variables, not the actual computation being done. In my case, you load up CPU's time with PUSH/POP instructions to provide linkage and parameter passing between various pieces of code. The smaller you make your pieces of code, the more overhead "linkage" is required. I am concerned that this linkage adds to software bloat and slow-down and I am wondering if I should be concerned about this, and how much, if any at all, because current and future generations of programmers who are building software for the next century, will have to live with and consume software built using these practices. UPDATE: Multiple files I am writing new code now that is slowly replacing old code. In particular I've noted that one of the old classes was a ~3000 line file (as mentioned earlier). Now it is becoming a set of 15-20 files located across various directories, including test files and not including PHP framework I am using to bind some things together. More files are coming as well. When it comes to disk I/O, loading multiple files is slower than loading one large file. Of course not all files are loaded, they are loaded as needed, and disk caching and memory caching options exist, and yet still I believe that loading multiple files takes more processing than loading a single file into memory. I am adding that to my concern.

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  • How to determine if the variable is a function in Python?

    - by bodacydo
    Since functions are values in Python, how do I determine if the variable is a function? For example: boda = len # boda is the length function now if ?is_var_function(boda)?: print "Boda is a function!" else: print "Boda is not a function!" Here hypothetical ?is_var_function(x)? should return true if x is a callable function, and false if it is not. Please advise! Thanks, Boda Cydo.

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  • Issue with my wordpress functions.php script

    - by iMayne
    Hello peeps. Im having an issues when activating my theme in wordpress. I got this error message: "Parse error: syntax error, unexpected $end in C:\xampp\htdocs\xampp\wordpress\wp-content\themes\xit\functions.php on line 223". Whats wrong, I totally dont understand. The script of the php is: <?php if ( function_exists('register_sidebar') ) register_sidebar(array( 'before_widget' => '', 'after_widget' => '', 'before_title' => '<h2>', 'after_title' => '</h2>', )); function content($num) { $theContent = get_the_content(); $output = preg_replace('/<img[^>]+./','', $theContent); $limit = $num+1; $content = explode(' ', $output, $limit); array_pop($content); $content = implode(" ",$content)."..."; echo $content; } function post_is_in_descendant_category( $cats, $_post = null ) { foreach ( (array) $cats as $cat ) { // get_term_children() accepts integer ID only $descendants = get_term_children( (int) $cat, 'category'); if ( $descendants && in_category( $descendants, $_post ) ) return true; } return false; } //custom comments function mytheme_comment($comment, $args, $depth) { $GLOBALS['comment'] = $comment; ?> <li <?php comment_class(); ?> id="li-comment-<?php comment_ID() ?>"> <div id="comment-<?php comment_ID(); ?>"> <div class="comment-author vcard"> <div class="comment-meta commentmetadata"> <?php echo get_avatar($comment,$size='32',$default='http://www.gravatar.com/avatar/61a58ec1c1fba116f8424035089b7c71?s=32&d=&r=G' ); ?> <?php printf(__('%1$s at %2$s'), get_comment_date(), get_comment_time()) ?> <br /><?php printf(__('<strong>%s</strong> says:'), get_comment_author_link()) ?><?php edit_comment_link(__('(Edit)'),' ','') ?></div> </div> <?php if ($comment->comment_approved == '0') : ?> <em><?php _e('Your comment is awaiting moderation.') ?></em> <br /> <?php endif; ?> <div class="text"><?php comment_text() ?></div> <div class="reply"> <?php comment_reply_link(array_merge( $args, array('depth' => $depth, 'max_depth' => $args['max_depth']))) ?> </div> </div> <?php } add_action('admin_menu', 'xit_theme_page'); function xit_theme_page () { if ( count($_POST) > 0 && isset($_POST['xit_settings']) ) { $options = array ( 'style','logo_img','logo_alt','logo_txt', 'logo_tagline', 'tagline_width', 'contact_email','ads', 'advertise_page', 'twitter_link', 'facebook_link', 'flickr', 'about_tit', 'about_txt', 'analytics'); foreach ( $options as $opt ) { delete_option ( 'xit_'.$opt, $_POST[$opt] ); add_option ( 'xit_'.$opt, $_POST[$opt] ); } } add_theme_page(__('Xit Options'), __('Xit Options'), 'edit_themes', basename(__FILE__), 'xit_settings'); } function xit_settings () {?> <div class="wrap"> <h2>XIT Options Panel</h2> <form method="post" action=""> <table class="form-table"> <!-- General settings --> <tr> <th colspan="2"><strong>General Settings</strong></th> </tr> <tr valign="top"> <th scope="row"><label for="style">Theme Color Scheme</label></th> <td> <select name="style" id="style"> <option value="pink.css" <?php if(get_option('xit_style') == 'pink.css'){?>selected="selected"<?php }?>>pink.css</option> <option value="blue.css" <?php if(get_option('xit_style') == 'blue.css'){?>selected="selected"<?php }?>>blue.css</option> <option value="orange.css" <?php if(get_option('xit_style') == 'orange.css'){?>selected="selected"<?php }?>>orange.css</option> </select> </td> </tr> <tr valign="top"> <th scope="row"><label for="logo_img">Logo image (full path to image)</label></th> <td> <input name="logo_img" type="text" id="logo_img" value="<?php echo get_option('xit_logo_img'); ?>" class="regular-text" /> </td> </tr> <tr valign="top"> <th scope="row"><label for="logo_alt">Logo image ALT text</label></th> <td> <input name="logo_alt" type="text" id="logo_alt" value="<?php echo get_option('xit_logo_alt'); ?>" class="regular-text" /> </td> </tr> <tr valign="top"> <th scope="row"><label for="logo_txt">Text logo</label></th> <td> <input name="logo_txt" type="text" id="logo_txt" value="<?php echo get_option('xit_logo_txt'); ?>" class="regular-text" /> <br /><em>Leave this empty if you entered an image as logo</em> </td> </tr> <tr valign="top"> <th scope="row"><label for="logo_tagline">Logo Tag Line</label></th> <td> <input name="logo_tagline" type="text" id="logo_tagline" value="<?php echo get_option('xit_logo_tagline'); ?>" class="regular-text" /> </td> </tr> <tr valign="top"> <th scope="row"><label for="tagline_width">Tag Line Box Width (px)</label><br /><em style="font-size:11px">Default width: 300px</em></th> <td> <input name="tagline_width" type="text" id="tagline_width" value="<?php echo get_option('xit_tagline_width'); ?>" class="regular-text" /> </td> </tr> <tr valign="top"> <th scope="row"><label for="contact_email">Email Address for Contact Form</label></th> <td> <input name="contact_email" type="text" id="contact_email" value="<?php echo get_option('xit_contact_email'); ?>" class="regular-text" /> </td> </tr> <tr valign="top"> <th scope="row"><label for="twitter_link">Twitter link</label></th> <td> <input name="twitter_link" type="text" id="twitter_link" value="<?php echo get_option('xit_twitter_link'); ?>" class="regular-text" /> </td> </tr> <tr valign="top"> <th scope="row"><label for="facebook_link">Facebook link</label></th> <td> <input name="facebook_link" type="text" id="facebook_link" value="<?php echo get_option('xit_facebook_link'); ?>" class="regular-text" /> </td> </tr> <tr valign="top"> <th scope="row"><label for="flickr">Flickr Photostream</label></th> <td> <select name="flickr" id="flickr"> <option value="yes" <?php if(get_option('xit_flickr') == 'yes'){?>selected="selected"<?php }?>>Yes</option> <option value="no" <?php if(get_option('xit_flickr') == 'no'){?>selected="selected"<?php }?>>No</option> </select> <br /><em>Make sure you have FlickrRSS plugin activated if you choose to enable Flickr Photostream</em> </td> </tr> <!-- Sidebar ABout Box--> <tr> <th colspan="2"><strong>Sidebar About Box</strong></th> </tr> <tr valign="top"> <th scope="row"><label for="about_tit">Title</label></th> <td> <input name="about_tit" type="text" id="about_tit" value="<?php echo get_option('xit_about_tit'); ?>" class="regular-text" /> </td> </tr> <tr valign="top"> <th scope="row"><label for="about_txt">Text</label></th> <td> <textarea cols="60" rows="5" name="about_txt" type="text" id="about_txt" class="regular-text" /><?php echo get_option('xit_about_txt'); ?></textarea> </td> </tr> <!-- Ads Box Settings --> <tr> <th colspan="2"><strong>Ads Box Settings</strong></th> </tr> <tr> <th><label for="ads">Ads Section Enabled:</label></th> <td> <select name="ads" id="ads"> <option value="yes" <?php if(get_option('xit_ads') == 'yes'){?>selected="selected"<?php }?>>Yes</option> <option value="no" <?php if(get_option('xit_ads') == 'no'){?>selected="selected"<?php }?>>No</option> </select> <br /><em>Make sure you have AdMinister plugin activated and have the position "Sidebar" created within the plugin.</em> </td> </tr> <tr valign="top"> <th scope="row"><label for="advertise_page">Advertise Page</label></th> <td> <?php wp_dropdown_pages("name=advertise_page&show_option_none=".__('- Select -')."&selected=" .get_option('xit_advertise_page')); ?> </td> </tr> <!-- Google Analytics --> <tr> <th><label for="ads">Google Analytics code:</label></th> <td> <textarea name="analytics" id="analytics" rows="7" cols="70" style="font-size:11px;"><?php echo stripslashes(get_option('xit_analytics')); ?></textarea> </td> </tr> </table> <p class="submit"> <input type="submit" name="Submit" class="button-primary" value="Save Changes" /> <input type="hidden" name="xit_settings" value="save" style="display:none;" /> </p> </form> </div> <? }?> <?php function get_first_image() { global $post, $posts; $first_img = ''; ob_start(); ob_end_clean(); $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches); $first_img = $matches [1] [0]; if(empty($first_img)){ //Defines a default image $first_img = "/images/default.jpg"; } return $first_img; } ?> The last line is line 223.

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  • Why does a PHP function with no parameters require parentheses?

    - by MarkRobinson
    I just spent 3 hours wondering why I couldn't start a session, then realised that I used: session_start; when I should have used: session_start(); I received no error messages at all! Perhaps then, I thought, it's a lazy way to differentiate functions from variables - but then remembered that it can't be as variables require a $ Can anyone tell me why parentheses are required then, and also why no error is given when they aren't used?

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  • How would I duplicate the Rank function in a Sql Server Compact Edition SELECT statement?

    - by AMissico
    It doesn't look like SQL Server Compact Edition supports the RANK() function. (See Functions (SQL Server Compact Edition) at http://msdn.microsoft.com/en-us/library/ms174077(SQL.90).aspx). How would I duplicate the RANK() function in a SQL Server Compact Edition SELECT statement. (Please use Northwind.sdf for any sample select statements, as it is the only one I can open with SQL Server 2005 Management Studio.)

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