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  • Work with function references

    - by Ockonal
    Hello, I have another one question about functions reference. For example, I have such definition: typedef boost::function<bool (Entity &handle)> behaviorRef; std::map< std::string, ptr_vector<behaviorRef> > eventAssociation; The first question is: how to insert values into such map object? I tried: eventAssociation.insert(std::pair< std::string, ptr_vector<behaviorRef> >(eventType, ptr_vector<behaviorRef>(callback))); But the error: no matching function for call to ‘boost::ptr_vector<boost::function<bool(Entity&)> >::push_back(Entity::behaviorRef&)’ And I undersatnd it, but can't make workable code. The second question is how to call such functions? For example, I have one object of behaviorRef, how to call it with boost::bind with passing my own values?

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  • 2 dimensional arrays passed to a function in c++

    - by John Marcus
    I'm working on doing calculations in a two dimensional array but keep getting a nasty error. i call the function by : if(checkArray(array)) and try to pass it in like this: bool checkArray(double array[][10]) //or double *array[][10] to no avail the error is error: cannot convert ‘double ()[(((unsigned int)(((int)n) + -0x00000000000000001)) + 1)]’ to ‘double’ for argument ‘1’ to ‘bool checkArray(double*)’ code snippet //array declaration int n = 10; double array[n][n]; //function call to pass in array while(f != 25) { cout<<endl; cout<<endl; if(checkArray(array)) //this is the line of the error { cout<<"EXIT EXIT EXIT"<<endl; } f++; } //function declaration bool checkArray(double *array)//, double newArray[][10]) { double length = sizeof(array); for(int i = 0; i < length; i++) for(int j = 0; j < length;j++) { double temp = array[i][j]; } }

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  • Template problems: No matching function for call

    - by Nick Sweet
    I'm trying to create a template class, and when I define a non-member template function, I get the "No matching function for call to randvec()" error. I have a template class defined as: template <class T> class Vector { T x, y, z; public: //constructors Vector(); Vector(const T& x, const T& y, const T& z); Vector(const Vector& u); //accessors T getx() const; T gety() const; T getz() const; //mutators void setx(const T& x); void sety(const T& y); void setz(const T& z); //operations void operator-(); Vector plus(const Vector& v); Vector minus(const Vector& v); Vector cross(const Vector& v); T dot(const Vector& v); void times(const T& s); T length() const; //Vector<T>& randvec(); //operators Vector& operator=(const Vector& rhs); friend std::ostream& operator<< <T>(std::ostream&, const Vector<T>&); }; and the function in question, which I've defined after all those functions above, is: //random Vector template <class T> Vector<double>& randvec() { const int min=-10, max=10; Vector<double>* r = new Vector<double>; int randx, randy, randz, temp; const int bucket_size = RAND_MAX/(max-min +1); temp = rand(); //voodoo hackery do randx = (rand()/bucket_size)+min; while (randx < min || randx > max); r->setx(randx); do randy = (rand()/bucket_size)+min; while (randy < min || randy > max); r->sety(randy); do randz = (rand()/bucket_size)+min; while (randz < min || randz > max); r->setz(randz); return *r; } Yet, every time I call it in my main function using a line like: Vector<double> a(randvec()); I get that error. However, if I remove the template and define it using 'double' instead of 'T', the call to randvec() works perfectly. Why doesn't it recognize randvec()? P.S. Don't mind the bit labeled voodoo hackery - this is just a cheap hack so that I can get around another problem I encountered.

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  • C++ function will not return

    - by Mike
    I have a function that I am calling that runs all the way up to where it should return but doesn't return. If I cout something for debugging at the very end of the function, it gets displayed but the function does not return. fetchData is the function I am referring to. It gets called by outputFile. cout displays "done here" but not "data fetched" I know this code is messy but can anyone help me figure this out? Thanks //Given an inode return all data of i_block data char* fetchData(iNode tempInode){ char* data; data = new char[tempInode.i_size]; this->currentInodeSize = tempInode.i_size; //Loop through blocks to retrieve data vector<unsigned int> i_blocks; i_blocks.reserve(tempInode.i_blocks); this->currentDataPosition = 0; cout << "currentDataPosition set to 0" << std::endl; cout << "i_blocks:" << tempInode.i_blocks << std::endl; int i = 0; for(i = 0; i < 12; i++){ if(tempInode.i_block[i] == 0) break; i_blocks.push_back(tempInode.i_block[i]); } appendIndirectData(tempInode.i_block[12], &i_blocks); appendDoubleIndirectData(tempInode.i_block[13], &i_blocks); appendTripleIndirectData(tempInode.i_block[14], &i_blocks); //Loop through all the block addresses to get the actual data for(i=0; i < i_blocks.size(); i++){ appendData(i_blocks[i], data); } cout << "done here" << std::endl; return data; } void appendData(int block, char* data){ char* tempBuffer; tempBuffer = new char[this->blockSize]; ifstream file (this->filename, std::ios::binary); int entryLocation = block*this->blockSize; file.seekg (entryLocation, ios::beg); file.read(tempBuffer, this->blockSize); //Append this block to data for(int i=0; i < this->blockSize; i++){ data[this->currentDataPosition] = tempBuffer[i]; this->currentDataPosition++; } data[this->currentDataPosition] = '\0'; } void outputFile(iNode file, string filename){ char* data; cout << "File Transfer Started" << std::endl; data = this->fetchData(file); cout << "data fetched" << std::endl; char *outputFile = (char*)filename.c_str(); ofstream myfile; myfile.open (outputFile,ios::out|ios::binary); int i = 0; for(i=0; i < file.i_size; i++){ myfile << data[i]; } myfile.close(); cout << "File Transfer Completed" << std::endl; return; }

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  • Pipelined function calling another pipelined function.

    - by René Nyffenegger
    Here's a package with two pipelined functions: create or replace type tq84_line as table of varchar2(25); / create or replace package tq84_pipelined as function more_rows return tq84_line pipelined; function go return tq84_line pipelined; end tq84_pipelined; / Ant the corresponding package body: create or replace package body tq84_pipelined as function more_rows return tq84_line pipelined is begin pipe row('ist'); pipe row('Eugen,'); return; end more_rows; function go return tq84_line pipelined is begin pipe row('Mein'); pipe row('Name'); /* start */ for next in ( select column_value line from table(more_rows) ) loop pipe row(next.line); end loop; /* end */ pipe row('ich'); pipe row('weiss'); pipe row('von'); pipe row('nichts.'); end go; end tq84_pipelined; / The important thing is that go sort of calls more_rows with the for next in ... between /* start */ and /* end */ I can use the package as follows: select * from table(tq84_pipelined.go); This is all fine and dandy, but I hoped I could replace the lines between /* start */ and /* end */ with a simple call of more_rows. However, this is obviously not possible, as it generetes a PLS-00221: 'MORE_ROWS' is not a procedure or is undefined. So, my question: is there really no way to shortcut the loop?

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  • Largest triangle from a set of points

    - by Faken
    I have a set of random points from which i want to find the largest triangle by area who's verticies are each on one of those points. So far I have figured out that the largest triangle's verticies will only lie on the outside points of the cloud of points (or the convex hull) so i have programmed a function to do just that (using Graham scan in nlogn time). However that's where I'm stuck. The only way I can figure out how to find the largest triangle from these points is to use brute force at n^3 time which is still acceptable in an average case as the convex hull algorithm usually kicks out the vast majority of points. However in a worst case scenario where points are on a circle, this method would fail miserably. Dose anyone know an algorithm to do this more efficiently? Note: I know that CGAL has this algorithm there but they do not go into any details on how its done. I don't want to use libraries, i want to learn this and program it myself (and also allow me to tweak it to exactly the way i want it to operate, just like the graham scan in which other implementations pick up collinear points that i don't want).

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  • "Function object is unsubscriptable" in basic integer to string mapping function

    - by IanWhalen
    I'm trying to write a function to return the word string of any number less than 1000. Everytime I run my code at the interactive prompt it appears to work without issue but when I try to import wordify and run it with a test number higher than 20 it fails as "TypeError: 'function' object is unsubscriptable". Based on the error message, it seems the issue is when it tries to index numString (for example trying to extract the number 4 out of the test case of n = 24) and the compiler thinks numString is a function instead of a string. since the first line of the function is me defining numString as a string of the variable n, I'm not really sure why that is. Any help in getting around this error, or even just help in explaining why I'm seeing it, would be awesome. def wordify(n): # Convert n to a string to parse out ones, tens and hundreds later. numString = str(n) # N less than 20 is hard-coded. if n < 21: return numToWordMap(n) # N between 21 and 99 parses ones and tens then concatenates. elif n < 100: onesNum = numString[-1] ones = numToWordMap(int(onesNum)) tensNum = numString[-2] tens = numToWordMap(int(tensNum)*10) return tens+ones else: # TODO pass def numToWordMap(num): mapping = { 0:"", 1:"one", 2:"two", 3:"three", 4:"four", 5:"five", 6:"six", 7:"seven", 8:"eight", 9:"nine", 10:"ten", 11:"eleven", 12:"twelve", 13:"thirteen", 14:"fourteen", 15:"fifteen", 16:"sixteen", 17:"seventeen", 18:"eighteen", 19:"nineteen", 20:"twenty", 30:"thirty", 40:"fourty", 50:"fifty", 60:"sixty", 70:"seventy", 80:"eighty", 90:"ninety", 100:"onehundred", 200:"twohundred", 300:"threehundred", 400:"fourhundred", 500:"fivehundred", 600:"sixhundred", 700:"sevenhundred", 800:"eighthundred", 900:"ninehundred", } return mapping[num] if __name__ == '__main__': pass

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  • PHP - Calling function inside another class -> function

    - by Kolind
    I'm trying to do this: class database { function editProvider($post) { $sql = "UPDATE tbl SET "; foreach($post as $key => $val): if($key != "providerId") { $val = formValidate($val); $sqlE[] = "`$key`='$val'"; } endforeach; $sqlE = implode(",", $sqlE); $where = ' WHERE `id` = \''.$post['id'].'\''; $sql = $sql . $sqlE . $where; $query = mysql_query($sql); if($query){ return true; } } // }//end class And then use this function * INSIDE of another class *: function formValidate($string){ $string = trim($string); $string = mysql_real_escape_string($string); return $string; } // .. on $val. Why doesn't this work? if I write in a field of the form, it's not escaping anything at all. How can that be? * UPDATE * handler.php: if(isset($_GET['do'])){ if($_GET['do'] == "addLogin") { $addLogin = $db->addLogin($_POST); } if($_GET['do'] == "addProvider") { $addProvider = $db->addProvider($_POST); } if($_GET['do'] == "editProfile") { $editProfile = $db->editProfile($_POST); } if($_GET['do'] == "editProvider") { $editProvider = $db->editProvider($_POST); } } //end if isset get do ** The editProvider function works fine except for this :-) **

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  • Save Points

    - by raghu.yadav
    Explicit save point : Requires an end user action before a bounded or unbounded task flow creates a save point. For example, an end user clicks a button that invokes a method call activity that, in turn, creates a save point Implicit save point : can only originate from a bounded task flow if 1) A session times out due to end user inactivity 2) An end user logs out without saving the data 3) An end user closes the only browser window, thus logging out of the application 4) An end user navigates away from the current application using control flow rules (for example, uses a goLink component to go to an external URL) and having unsaved data. good usecases and examples given by frank/biemond and on implicit save points http://www.oracle.com/technology/products/jdev/tips/fnimphius/cancelForm/cancelForm_wsp.html?_template=/ocom/print http://biemond.blogspot.com/2008/04/automatically-save-transactions-with.html

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  • "Please ensure you have JAVA_HOME points to JDK rather than JRE" message

    - by Alex Malex
    I have java installed aaa@ubuntu:~$ whereis java java: /usr/bin/java /usr/bin/X11/java /usr/local/java /usr/share/java aaa@ubuntu:~$ whereis javac javac: /usr/bin/javac /usr/bin/X11/javac and etc/profile JAVA_HOME=/usr/local/java/jdk1.7.0_17 PATH=$PATH:$HOME/bin:$JAVA_HOME/bin JRE_HOME=/usr/local/java/jre1.7.0_17 PATH=$PATH:$HOME/bin:$JRE_HOME/bin export JAVA_HOME export JRE_HOME export PATH However, when I run Android Studio, it says: tools.jar in not in Android Studio classpath. Please ensure you have JAVA_HOME points to JDK rather than JRE. How do I fix it? update sudo update-alternatives --get-selections | grep ^java java manual /usr/local/java/jre1.7.0_17/bin/java javac manual /usr/local/java/jdk1.7.0_17/bin/javac javaws manual /usr/local/java/jre1.7.0_17/bin/javaws java -version java version "1.7.0_17"

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  • After upgrade to xubuntu 12.10 I have 2 mount points for each partition

    - by TiGR
    Just upgraded Xubuntu 12.04 to 12.10 (both XFCE and LXDE desktops are being used at this system). Now I have 2 mount points for each partition. It looks like this: It appears this way in both Thunar and PCManFM. However, there are no dupes in Nautilus. $ ls /dev/disk/by-id/ ata-ST320410A_5FB3MA76 ata-ST3250620A_9RT030B0-part3 scsi-SATA_ST320410A_5FB3MA76-part1 scsi-SATA_ST3250620A_9RT030B0-part4 ata-ST320410A_5FB3MA76-part1 ata-ST3250620A_9RT030B0-part4 scsi-SATA_ST320410A_5FB3MA76-part2 scsi-SATA_ST3250620A_9RT030B0-part5 ata-ST320410A_5FB3MA76-part2 ata-ST3250620A_9RT030B0-part5 scsi-SATA_ST320410A_5FB3MA76-part3 scsi-SATA_ST3250620A_9RT030B0-part6 ata-ST320410A_5FB3MA76-part3 ata-ST3250620A_9RT030B0-part6 scsi-SATA_ST3250620A_9RT030B0 scsi-SATA_ST3250620A_9RT030B0-part7 ata-ST3250620A_9RT030B0 ata-ST3250620A_9RT030B0-part7 scsi-SATA_ST3250620A_9RT030B0-part1 scsi-SATA_ST3250620A_9RT030B0-part8 ata-ST3250620A_9RT030B0-part1 ata-ST3250620A_9RT030B0-part8 scsi-SATA_ST3250620A_9RT030B0-part2 ata-ST3250620A_9RT030B0-part2 scsi-SATA_ST320410A_5FB3MA76 scsi-SATA_ST3250620A_9RT030B0-part3 $ ls /dev/disk/by-uuid/ 01CD9E239FDF54F0 5299-430B 8824C9E324C9D3FA b05c582e-77df-4b83-8a75-17db1ab5dbc1 09a9cf9e-6af4-45ed-a9ac-782c764fe8d1 6bbd501e-7601-4ee7-b725-d3ec7f19f149 8B7C-BAF8 f54ee301-4bd4-40e3-a9fb-75ca79c05974 50366CC66E8BA293 8553dc4a-5d63-4078-9be3-ea91a46d8c67 a5be1bcd-b7c6-4273-8ade-eb9cce15504d There are no SCSI drives in this system. What could cause this problem? Is it a bug?

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  • javascript summary function

    - by Phil Jackson
    Hello, im trying to make a small name summary function depending on the size of the elements container, here's what I have; function shorten_text(str, size){ size = size.match( /[0-9]*/ ); var endValue = Math.floor( Number(size) / 10 ); var number; var newStr; for ( number = 0; number <= endValue; number++ ) { if( str[number].length != 0 ) { newStr += str[number]; } } return newStr + '...'; } shorten_text('Phil Jackson', '94px'); // output should be 'Phil Jack...' What I seem to get is undefinedundef... can anyone see where I am going wrong?

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  • Constructing a hash table/hash function.

    - by nn
    Hi, I would like to construct a hash table that looks up keys in sequences (strings) of bytes ranging from 1 to 15 bytes. I would like to store an integer value, so I imagine an array for hashing would suffice. I'm having difficulty conceptualizing how to construct a hash function such that given the key would give an index into the array. Any assistance would be much appreiated. The maximum number of entries in the hash is: 4081*15 + 4081*14 + ... 4081 = 4081((15*(16))/2) = 489720. So for example: int table[489720]; int lookup(unsigned char *key) { int index = hash(key); return table[index]; } How can I compute hash(key). I'd preferably like to get a perfect hash function. Thanks.

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  • Static Function Help C++

    - by Alex
    I can't get past this issue I am having. Here's a simple example: class x { public: void function(void); private: static void function2(void); void x::function(void) { x::function2(void); } static void function2(void) { //something } } I get errors in which complain about function2 being private. If I make it public (which I don't really want to do) I get errors about an undefined reference to function2. What am I doing wrong? Thank you!

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  • Inverse Logistic Function / Reverse Sigmoid Function

    - by Chanq
    I am currently coding up a fuzzy logic library in java. I have found the equations for all the standard functions - Grade, inverseGrade, Triangle, Trapezoid, Gaussian. However, I can't find the inverse of the sigmoid/ logistic function. The way I have written the logistic function is java is : //f(x) = 1/(1+e(-x)) public double logistic(double x){ return (1/(1+(Math.exp(-x))); } But I can't work out or find the inverse anywhere. My algebraic/calculus abilities are fairly limited, hence why I haven't been able to work out the inverse of the function. Any hints or pointers would be a big help. Thanks

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  • Button click doesn't call function even when button attribute OnClick is set to that function

    - by Silmaril89
    Hi, I have an aspx page with two buttons, one of the buttons has an OnClick attribute to a function that should be run when clicked. When the other button is clicked there is an if statement checking if the page is a postback, if it is then I run some statements that need to be run when that button is clicked. That postback button works fine. However, the other button, when it's clicked the function it's supposed to call never executes, and the statements inside if (Page.IsPostBack) get executed instead. What can I do to fix this? Is there a way to make the button that calls a function not do a Post back?

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  • Question about function returning array data

    - by Doug
    var grossBrackets = new Array( '300', '400', '500', '600', '700', '800', '900', '1000' ); function bracketSort( itemToSort ) { for( index = 0 ; index < grossBrackets.length ; index++ ) { if ( itemToSort < grossBrackets[index] ) { bracketData[index]++; } else if ( itemToSort > grossBrackets[7] ) { grossBrackets[7]++; } } return bracketData; } This is my current code, and I basically want to sort the data into their proper brackets. My source code is really long, but when I input these numbers into the function: 200.18 200.27 200.36 200.45 200.54 bracketData prints 5,5,5,5,5,5,5,5 or is there a better way to do this? Brackets: <300, <400, <500, <600, <700, <800, <900, <1000, greater than 1000

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  • Why doesn't javascript function aliasing work?

    - by codeninja
    I have some Firebug console function calls that I wanted to disable when Firebug wasn't enabled, e.g. console isn't defined. This works fine in IE6 and FF3, but not in Chrome: var log; if(console){ log = console.log; }else{ log = function(){ return; } } I get an "Uncaught TypeError: Illegal Invocation" in Chrome =/ I read about the issue here, where you have to apply a context, which is kind of new to me... and I can't seem to figure how to accomplish the above in all browsers...

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  • php Set a anonymous function in an instance

    - by geekay
    I am just starting out with PHP, and I am wondering if there is a way to add an anonymous function to a class instance. For instance, lets say... class A{ public B; } $c = new A(); //This is where I am getting a little confused... //The following wont work $c->B = function(){echo('HelloWorld');}; $c->B(); What I am hoping to do is reuse the same spit of code in a great number of different applications, and make it so that I can just 'swap-out' and replace functions in specific instances. I am using php5.3 (so anonymous functions should work, just not in the way that I am using them). Thanks so very much for your time!! -GK

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  • When is a scala partial function not a partial function?

    - by Fred Haslam
    While creating a map of String to partial functions I ran into unexpected behavior. When I create a partial function as a map element it works fine. When I allocate to a val it invokes instead. Trying to invoke the check generates an error. Is this expected? Am I doing something dumb? Comment out the check() to see the invocation. I am using scala 2.7.7 def PartialFunctionProblem() = { def dream()() = { println("~Dream~"); new Exception().printStackTrace() } val map = scala.collection.mutable.HashMap[String,()=>Unit]() map("dream") = dream() // partial function map("dream")() // invokes as expected val check = dream() // unexpected invocation check() // error: check of type Unit does not take parameters }

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  • Declaring a function inside a function?

    - by nunos
    I have came across the following code, and being a c beginner, I came here for your help. This function is from a c implmentation of a queue. Bool queuePut(Queue *q, char c) { void beep(); if (queueFull(q)) { beep(); return false; } //do stuff return true; } So, I am getting a strange error with gcc on the void beep(). Can someone please explain me what is this, declaring a function inside a function. Or is it the void beep() simply out of place? I was given this code and there's always the possibility that it isn't correct. Thanks.

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