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  • why inner class doesn't compile..?

    - by Vincenzo
    This is my code: #include <algorithm> class A { void f() { struct CompareMe { bool operator() (int i, int j) { return i < j; } } comp; int a[] = {1, 2, 3, 4}; int found = std::min_element(a[0], a[3], comp); } } Error message: no matching function for call to ‘min_element(int&, int&, A::f()::CompareMe&) What am I doing wrong?

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  • Why does Go compile quickly?

    - by Evan Kroske
    I've Googled and poked around the Go website, but I can't seem to find an explanation for Go's extraordinary build times. Are they products of the language features (or lack thereof), a highly optimized compiler, or something else? I'm not trying to promote Go; I'm just curious.

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  • sudo changes PATH - why?

    - by Michiel de Mare
    This is the PATH variable without sudo: $ echo 'echo $PATH' | sh /opt/local/ruby/bin:/usr/bin:/bin This is the PATH variable with sudo: $echo 'echo $PATH' | sudo sh /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin As far as I can tell, sudo is supposed to leave PATH untouched. What's going on? How do I change this? (This is on Ubuntu 8.04). UPDATE: as far as I can see, none of the scripts started as root change PATH in any way. From man sudo: To prevent command spoofing, sudo checks ``.'' and ``'' (both denoting current directory) last when searching for a command in the user's PATH (if one or both are in the PATH). Note, however, that the actual PATH environment variable is not modified and is passed unchanged to the program that sudo executes.

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  • Why would MessageBox fail silently?

    - by Tim Gradwell
    Does anyone know how MessageBox(...) could fail silently? MessageBox(g_hMainhWnd, buffer, "Oops!", MB_OK | MB_ICONERROR); ShellExecute(0, "open", "http://intranet/crash_handler.php", NULL, "", SW_SHOWNORMAL); For a little context, this code is called inside our own exception handler, which was registered with SetUnhandledExceptionFilter() Most of the time, I see the message box, and then it launches a web browser. However, I have an exe, which as far as I'm aware uses this exact code, and it successfully launches the web browser, but I do not see the message box first. Thanks Tim

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  • Why is my JavaScript function "a" not defined?

    - by 4l3x
    When I call my JavaScript function B, the javascript console in firefox said that function A is not defined, but on chrome browser if defined. And when I call function "A" in body segment: <input type="button" onclick="A()" value=" ..A.. "> , firefox said that function B is not defined? :S <html> <head> <script language="javascript" type="text/javascript"> function B(){ alert(" hi B "); document.write('<br><br><input type="button" onClick="A()" value=" ..A..">'); }; function A(){ alert(" hi A"); document.write('<br><br><input type="button" onclick="B()" value=" ..b..">'); if (window.WebCL == undefined) { alert("Unfortunately your system does not support WebCL. "); return false; } } </script> </head> <body> <input type="button" onclick="B()" value=" ..B.. "> </body> </html>

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  • Why does jquery button take a second to refresh after updating a page using ajax

    - by oo
    when i refresh a part of a webpage that has a jquery ui button, it seems like I have to call: $(":button").button(); again or it shows up as a regular button. Thats fine but when i do this, it still shows up as a regular button for a split second before converting to the styling of the jquery theme. is there anyway to avoid this as it looks a bit messy. NOTE: i noticed that this is for anything that i am theming using jquery ui like autocomplete, button, etc. so its not button specific issue.

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  • Why is calling close() after fopen() not closing?

    - by Richard Morgan
    I ran across the following code in one of our in-house dlls and I am trying to understand the behavior it was showing: long GetFD(long* fd, const char* fileName, const char* mode) { string fileMode; if (strlen(mode) == 0 || tolower(mode[0]) == 'w' || tolower(mode[0]) == 'o') fileMode = string("w"); else if (tolower(mode[0]) == 'a') fileMode = string("a"); else if (tolower(mode[0]) == 'r') fileMode = string("r"); else return -1; FILE* ofp; ofp = fopen(fileName, fileMode.c_str()); if (! ofp) return -1; *fd = (long)_fileno(ofp); if (*fd < 0) return -1; return 0; } long CloseFD(long fd) { close((int)fd); return 0; } After repeated calling of GetFD with the appropriate CloseFD, the whole dll would no longer be able to do any file IO. I wrote a tester program and found that I could GetFD 509 times, but the 510th time would error. Using Process Explorer, the number of Handles did not increase. So it seems that the dll is reaching the limit for the number of open files; setting _setmaxstdio(2048) does increase the amount of times we can call GetFD. Obviously, the close() is working quite right. After a bit of searching, I replaced the fopen() call with: long GetFD(long* fd, const char* fileName, const char* mode) { *fd = (long)open(fileName, 2); if (*fd < 0) return -1; return 0; } Now, repeatedly calling GetFD/CloseFD works. What is going on here?

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  • Why my HttpPost can't receive all response data?

    - by Johnny
    I'm on Android 1.5, and my code is like this: HttpPost httpPost = new HttpPost(url); HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8); httpPost.setEntity(entity); HttpResponse response = httpClient.execute(httpPost); HttpEntity respEntity = response.getEntity(); String result = EntityUtils.toString(respEntity, DEFAULT_CHARSET); After successfully executed these codes, the result is a stripped string. I've tried using browser to test the url+param, it works fine and got all data. What's wrong with this code? Is there any parameters I need to specified?

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  • Why my :hover aren't working?

    - by user1628488
    I have am nav, and when i hover some elements, the submenu should be displayed 'block', but this dont work. See <!doctype html> <html lang="pt-br"> <head> <meta charset="utf-8" /> <meta name="robots" content="noindex, nofollow" /> <meta name="generator" content="Notepad++" /> <meta name="author" content="Erick Ribeiro" /> <meta http-equiv="refresh" content="60" /> <title>Mozilla Firefox</title> <style type="text/css"> *{ font-family: calibri; } #menu { float: left; } .submenu { margin-top: 26px; padding: 10px; border: solid 1px rgb(224, 224, 224); background: rgb(254, 254, 254); color: rgb(0, 128, 224); border-radius: 0 0 4px 4px; } #menuHome:hover ~ #submenuControle { display: block; opacity: 0; color: red; } #submenuHome { display: none; opacity: 0; } #submenuControle { display: block; opacity: 1; } #submenuGestão { display: none; opacity: 0; } #submenuRL { display: none; opacity: 0; } #submenuSI { display: none; opacity: 0; } ul { float: left; list-style-type: none; padding: 0; margin: 0; } li { display: inline; float:left; } .primeiroItem { border: solid rgb(224, 224, 224); border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-radius: 4px 0 0 4px; } .naoPrimeiroItem { border: solid rgb(224, 224, 224); border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 0; } .ultimoItem { border: solid rgb(224, 224, 224); border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 0; border-radius: 0 4px 4px 0; } a { text-decoration:none; padding: 8px; border: solid 1px; color: rgb(0, 0, 0); background: rgb(240,240, 240); } a:visited { color: rgb(0, 0, 0); } </style> <script type="text/javascript"> </script> </head> <body> <nav id="menu"> <ul> <li><a id="menuHome" class="primeiroItem" href="#">Home</a></li> <li><a id="menuControle" class="naoPrimeiroItem" href="#">Controle</a></li> <li><a id="menuGestao" class="naoPrimeiroItem" href="#">Gestão</a></li> <li><a id="menuRL" class="naoPrimeiroItem" href="#">Relatórios e Listas</a></li> <li><a id="menuSI" class="ultimoItem" href="#">Sistema Informação</a></li> </ul> <div id="submenuHome" class="submenu"> </div> <div id="submenuControle" class="submenu"> BSC Comunicação Treinamento Documentos Controle de Acesso </div> <div id="submenuGestão" class="submenu"> ASV Treinamento Suprimentos Chamados</div> <div id="submenuRL" class="submenu"> Listas Relatórios </div> <div id="submenuSI" class="submenu"> </div> </nav> </body> </html>

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  • Why won't this work; opencv Mat_<float>

    - by user1371674
    I can't seem to get this to work. I'm trying to get the pixel value of an image but first need to change the color of the image, but since I cannot use int or just Mat because the values are not whole numbers, I have to use and because of that errors pop up when I try to run this on the cmd. int main(int argc, char **argv) { Mat img = imread(argv[1]); ofstream myfile; Mat_<float> MatBlue = img; int rows1 = MatBlue.rows; int cols1 = MatBlue.cols; for(int x = 0; x < cols1; x++) { for(int y = 0; y < rows1; y++) { float val = MatBlue.at<cv::Vec3b>(y, x)[1]; MatBlue.at<cv::Vec3b>(y, x)[0] = val + 1; } } }

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  • Why is Lisp used for AI?

    - by Cristián Romo
    I've been learning Lisp to expand my horizons because I have heard that it is used in AI programming. After doing some exploring, I have yet to find AI examples or anything in the language that would make it more inclined towards it. Was Lisp used in the past because it was available, or is there something that I'm just missing?

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  • Why Does My Vector<PEVENTLOGRECORD> Mysteriously Get Cleared?

    - by Eric
    Hello everyone, I am making a program that reads and stores data from Windows EventLog files (.evt) in C++. I am using the calls OpenBackupEventLog(ServerName, FileName) and ReadEventLog(...). Also using this: PEVENTLOGRECORD Anyway, without supplying all of the code, here is the basic idea: 1. I get a handle to the .evt file using OpenBackupEventLog() and passing in a file name. 2. I then use ReadEventLog() to fill up a buffer with an unknown number of EventLog messages. 3. I traverse through the buffer and add each message to a vector 4. I keep filling up buffers (repeat steps 2 and 3) until I reach the end of the file. Here is my code for filling the vector: vector<PEVENTLOGRECORD> allRecords; while(_status == ERROR_SUCCESS) { if(!ReadEventLog(...)) CheckStatus(); else FillVectorFromBuffer(allRecords) } // Function FillVectorFromBuffer FillVectorFromBuffer(vector(PEVENTLOGRECORD) &allRecords) { int bytesExamined = 0; PBYTE pRecord = (PBYTE)_lpBuffer; // This is one of the params in ReadEventLog() while(bytesExamined < _pnBytesRead) // Another param from ReadEventLog { PEVENTLOGRECORD currentRecord = (PEVENTLOGRECORD)(pRecord); allRecords.push_back(currentRecord); pRecord += currentRecord->Length; bytesExamined += currentRecord->Length; } } Anyway, whenever I run this, it will get all the EventLogs in the file, and the vector will have everything I want it to. But as soon as this line: if(!ReadEventLog()) gets called and returns true (aka ReadEventLog() returns false), then every field in my vector gets set to zero. The vector will still contain the correct number of elements, it's just that all of the fields in the PEVENTLOGRECORD struct are now zero. Anyone with better debugging experience have any ideas? Thanks.

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  • Why doesn't this code work?

    - by orangecl4now
    SignView *tempVC = [[SignView alloc] initWithNibName:@"SignView" bundle:Nil]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationTransition: UIViewAnimationTransitionCurlUp forView:self.view cache:YES]; [UIView setAnimationDelay:0.5f]; [UIView setAnimationDuration:2.0f]; [UIView commitAnimations]; [self presentModalViewController:tempVC animated:YES]; [tempVC passDataWithString:button2.titleLabel.text andColor:currentlySelectedColor isNightModeOn:nightMode.on]; The view slides up instead of Curling up. What am I doing wrong?

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  • Loading xml with Jquery - why doesn't this work

    - by es11
    I have regular javascript code and am trying to utilize JQuery just to load and parse an xml file. I have the following: function loadXml() { $(function() { $.ajax({ type: "GET", url: "my_file.xml", dataType: "xml", success: parseXml }); }); } function parseXml() { alert("Parsing..."); } When calling loadXml I cannot get the callback success function to execute. I am running this all locally and my_file.xml resides in the same directory as this javascript. Any ideas?

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  • Why is multitasking not supported on the iPhone ?

    - by srikanth rongali
    Many people are saying that Apple has restricted it for better performance. If so Apple should increase the size of RAM to support multitasking. So Apple is not allowing it. Others say that Cocoa Touch applications can't be multitasking as the iPhone has only one window and views on it. I can not understand which is the actual reason for this ? Please clarify me.

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  • why BOOST_FOREACH cannot handle const boost::ptr_map?

    - by psaghelyi
    void main() { typedef boost::ptr_map<int, char> MyMap; MyMap mymap; mymap[1] = 'a'; mymap[2] = 'b'; mymap[3] = 'c'; BOOST_FOREACH(MyMap::value_type value, mymap) { std::cout << value.first << " " << value.second << std::endl; } MyMap const & const_mymap = mymap; BOOST_FOREACH(MyMap::value_type value, const_mymap) { std::cout << value.first << " " << value.second << std::endl; } } The following error message comes from GCC at the second BOOST_FOREACH error: conversion from 'boost::ptr_container_detail::ref_pair<int, const char* const>' to non-scalar type 'boost::ptr_container_detail::ref_pair<int, char* const>' requested I reckon that this is the weakness of the pointer container's ref_pair...

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  • why save_model method doesn't work in admin.StackedInline?

    - by FurtiveFelon
    Hi all, I have a similar problem as a previously solved problem of mine, except this time solution doesn't seem to work: http://stackoverflow.com/questions/2991365/how-to-auto-insert-the-current-user-when-creating-an-object-in-django-admin Previously i used to override the save_model to stamp the user submitting the article. Now i need to do the same for comments, it doesn't seem to work anymore. Anyone have any ideas? Thanks a lot! Jason

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  • Why is this MySQL INSERT INTO running twice?

    - by stuboo
    I'm attempting to use the mysql insert statement below to add information to a database table. When I execute the script, however, the insert statement is run twice. Here's the URL mysite.com/save.php?Body=p220,c180 Thanks in advance. <?php //tipping fees application require('base.inc.php'); require('functions.inc.php'); // connect to the database & save this message there try { $dbh = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbuser, $dbpass); //$number = formatPhone($_REQUEST['From']); //if($number != 'xxx-xxx-xxxx'){die('SMS from unknown number');} // kill this if from anyone but mike $message = $_REQUEST['Body']; //$Sid = $_REQUEST['SmsSid']; $now = time(); echo $message; $message = explode(",",$message); echo '<pre>'; print_r($message); echo 'message count = '.count($message); echo '</pre>'; $i = 0; $j = count($message); while($i<$j){ $quantity =$message[$i]; $material = substr($quantity, 0, 1); $amount = substr($quantity, 1); switch ($material) { case 'p': $m = "paper"; break; case 'c': $m = "containers"; break; default: $m = "other"; } $count = $dbh->exec("INSERT INTO tippingtotals(sid,time,material,weight) VALUES('$i+$j','$now','$m','$amount')"); echo $count; echo '<br />'; $i++; } //close the database connection $dbh = null; } catch(PDOException $e) { echo $e->getMessage(); } ?>

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  • Why is this MySQL Join Statement not Working?

    - by Timmy
    Here is my code: $query2 = mysql_query("SELECT * FROM categories WHERE parent = $id JOIN SELECT * FROM posts WHERE main_nav_page = '$idTwo'"); while ($row2 = mysql_fetch_assoc($query2)) { $id = $row2['id']; $name = $row2['name']; $slug = $row2['slug']; $subMenuOrder = $row2['sub_menu_order']; echo "<tr>\n"; echo "<td>&nbsp; -- $name</td>\n"; echo "</tr>\n"; } Is my syntax wrong? EDIT: the error message is: Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in /home/studentw/public_html/new_nav.php on line 30

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  • Why do I get "could not load type" error with my custom SessionStateProvider

    - by Rising Star
    My associate has created a custom SessionStateProvider for me to use with my ASP.net application. I add the file CustomSessionStateProvider to my VS2008 Web Application Project and put the appropriate reference in the web.config and it works fine. However, my supervisor wants me to set this up as a GAC reference. At my office, we have many DLLs we've created that we use as GAC references across different projects. If I add my CustomSessionStateProvider to the Global Assembly Cache, my pages throw a could not load type CustomASP.CustomSessionStateProvider error. Simple removing the DLL from the GAC makes it work again, but I want to set this up as a GAC reference. What could be causing this problem?

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  • Why isn't this simple program working?

    - by user1445478
    I'm writing a very basic program that aims for the text view to display the phrase "Hello" after a button is pressed on the screen. However, I can't get this program to work; every time I run it, it says that the application has stopped unexpectedly. This is the program I wrote: public class EtudeActivityActivity extends Activity{ TextView tvResponse; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final TextView tvResponse = (TextView) findViewById (R.id.tvResponse); } public void updateTV(View v) { tvResponse.setText("Hello"); } } Also, I inserted an android:onClick = "updateTV" into my main.xml file for the button. Thanks for any help!

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