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  • Error: default parameter given for parameter 1

    - by pocoa
    Here is my class definition: class MyClass { public: void test(int val = 0); } void MyClass::test(int val = 0) { // } When I try to compile this code I get the error: "default parameter given for parameter 1" It's just a simple function, I don't know what's wrong. I'm using Eclipse + MinGW.

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  • Can't compare the norm of a vector to 1 in matlab

    - by Ian
    I'm trying to find out wether a matrix is orthonormal. I begin by checking if the vectors are normal by doing for j=1:2; if norm(S:,j) ~= 1; return; % Not normal vector end end But when norm returns 1.0000 comparing that to 1 is true and the function returns, which is not what i want. Any ideas? Thx

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  • Does python import all the listed libraries? - Python

    - by RadiantHex
    Hi folks, I'm just wondering, I often have really long python files and imports tend to stack quite quickly. PEP8 says that the imports should always be written at the beginning of the file. Do all the imported libraries get imported when calling a function coded in the file? Or do only the necessary libraries get called? Does it make sense to worry about this? Is there no reason to import libraries within the functions or classes that need them?

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  • Problem with upper-case and lower-case xpath functions in selenium IDE

    - by Aristotelis
    Hi, I am trying to get a xpath query using the xpath function lower-case or uppper-case, but they seem to not work in selenium (where I test my xpath before I apply it). Example that does NOT work: //*[.=upper-case('some text')] I have no problem locating the nodes I need in complex path and even using aggregated functions, as long as I don't use the upper and lower case. Has anyone encountered this before? Does it make sense? Thanks.

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  • How can we detect hotkeys registered by other apps?

    - by worlds-apart89
    Is it possible to detect all the hotkeys registered by the OS as well as software applications currently running? Any native or managed approach on the Windows platform? I know that the RegisterHotKey function returns false if the hotkey is already registered, but what I am looking for is an approach, method, etc. that will give me a list of registered hotkeys. Looping all possible combinations with RegisterHotKey does not sound like a good idea. Anything more efficient?

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  • How to know a device's name from its device ID in OS X?

    - by yangumi
    Hi all, I'm writing a program in OS X that receives click events from a mouse and a touchpad. When the user clicks at somewhere, the OS sends the device ID, which is just an int, and the position of the cursor to my callback function. I want to know if the click event comes from mouse or touchpad. So, how can I know the device's name from its device ID? Thank you! (I'm sorry for my poor English.)

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  • JQuery UI Autocomplete - disallow free text entry?

    - by JK
    Is it possible to disallow free text entry in the JQuery UI autocomplete widget? eg I only want the user to be allowed to select from the list of items that are presented in the autocomplete list, and dont want them to be able to write some random text. I didn't see anything in the demos/docs describing how to do this. http://jqueryui.com/demos/autocomplete/ I'm using autocomplete like this $('#selector').autocomplete({ source: url, minlength: 2, select: function (event, ui) { // etc }

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  • fwrite write an integer

    - by user149100
    I'm trying to write a word to a file using this function: extern void write_int(FILE * out, int num) { fwrite(&num,sizeof(int),1, out); if(ferror(out)){ perror(__func__); exit(EXIT_FAILURE); } } But I get a segmentation fault whenever it tries to run the fwrite. I looked at the man page for fwrite(3) and I feel like I used it correctly, is there something I'm missing?

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  • open layers LineString not working

    - by AlexS
    Sorry to bother you guys, but I'm stuck with his problem for half a day. I want to draw poly line in OpenLayers using LineString object, so I've copied the example from documentation. It runs ok but i can't see the line on the screen Code looks like this <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> var map; var lineLayer ; var points; var style; var polygonFeature function test() { lineLayer = new OpenLayers.Layer.Vector("Line Layer"); style = { strokeColor: '#0000ff', strokeOpacity: 1, strokeWidth: 10 }; map.addLayer(lineLayer); points = new Array(); points[0] =new OpenLayers.LonLat(-2.460181,27.333984 ).transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject());; points[1] = new OpenLayers.LonLat(-3.864255,-22.5 ).transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject());; var linear_ring = new OpenLayers.Geometry.LinearRing(points); polygonFeature = new OpenLayers.Feature.Vector( new OpenLayers.Geometry.Polygon([linear_ring]), null, style); lineLayer.addFeatures([polygonFeature]); alert("1"); } function initialize() { map = new OpenLayers.Map ("map_canvas", { controls:[ new OpenLayers.Control.Navigation(), new OpenLayers.Control.PanZoomBar(), new OpenLayers.Control.LayerSwitcher(), new OpenLayers.Control.Attribution()], maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34), maxResolution: 156543.0399, numZoomLevels: 19, units: 'm', projection: new OpenLayers.Projection("EPSG:900913"), displayProjection: new OpenLayers.Projection("EPSG:4326") }); // Define the map layer // Here we use a predefined layer that will be kept up to date with URL changes layerMapnik = new OpenLayers.Layer.OSM.Mapnik("Mapnik"); map.addLayer(layerMapnik); var lonLat = new OpenLayers.LonLat(0, 0).transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject()); map.zoomTo(3); map.setCenter(lonLat, 19); test(); } </head> <body onload="initialize()" > <div id="map_canvas" style="width: 828px; height: 698px"></div> I'm sure I'm missing some parameter in creation of map or something but I really can't figure which one.

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  • What's the difference between isPrototypeOf and intanceof in Javascript?

    - by Steffen Heil
    Hi In some of my own older code, I use the following: Object.prototype.instanceOf = function( iface ) { return iface.prototype.isPrototypeOf( this ); }; Then I do (for example) [].instanceOf( Array ) This works, but it seems the following would do the same: [] instanceof Array Now, surly this is only a very simple example. My question therefor is: Is a instanceof b ALWAYS the same as b.prototype.isPrototypeOf(a) ? Regards, Steffen

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  • Suggestions for duplicate file finder algorithm (using C)

    - by Andrei Ciobanu
    Hello, I wanted to write a program that test if two files are duplicates (have exactly the same content). First I test if the files have the same sizes, and if they have i start to compare their contents. My first idea, was to "split" the files into fixed size blocks, then start a thread for every block, fseek to startup character of every block and continue the comparisons in parallel. When a comparison from a thread fails, the other working threads are canceled, and the program exits out of the thread spawning loop. The code looks like this: dupf.h #ifndef __NM__DUPF__H__ #define __NM__DUPF__H__ #define NUM_THREADS 15 #define BLOCK_SIZE 8192 /* Thread argument structure */ struct thread_arg_s { const char *name_f1; /* First file name */ const char *name_f2; /* Second file name */ int cursor; /* Where to seek in the file */ }; typedef struct thread_arg_s thread_arg; /** * 'arg' is of type thread_arg. * Checks if the specified file blocks are * duplicates. */ void *check_block_dup(void *arg); /** * Checks if two files are duplicates */ int check_dup(const char *name_f1, const char *name_f2); /** * Returns a valid pointer to a file. * If the file (given by the path/name 'fname') cannot be opened * in 'mode', the program is interrupted an error message is shown. **/ FILE *safe_fopen(const char *name, const char *mode); #endif dupf.c #include <errno.h> #include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include "dupf.h" FILE *safe_fopen(const char *fname, const char *mode) { FILE *f = NULL; f = fopen(fname, mode); if (f == NULL) { char emsg[255]; sprintf(emsg, "FOPEN() %s\t", fname); perror(emsg); exit(-1); } return (f); } void *check_block_dup(void *arg) { const char *name_f1 = NULL, *name_f2 = NULL; /* File names */ FILE *f1 = NULL, *f2 = NULL; /* Streams */ int cursor = 0; /* Reading cursor */ char buff_f1[BLOCK_SIZE], buff_f2[BLOCK_SIZE]; /* Character buffers */ int rchars_1, rchars_2; /* Readed characters */ /* Initializing variables from 'arg' */ name_f1 = ((thread_arg*)arg)->name_f1; name_f2 = ((thread_arg*)arg)->name_f2; cursor = ((thread_arg*)arg)->cursor; /* Opening files */ f1 = safe_fopen(name_f1, "r"); f2 = safe_fopen(name_f2, "r"); /* Setup cursor in files */ fseek(f1, cursor, SEEK_SET); fseek(f2, cursor, SEEK_SET); /* Initialize buffers */ rchars_1 = fread(buff_f1, 1, BLOCK_SIZE, f1); rchars_2 = fread(buff_f2, 1, BLOCK_SIZE, f2); if (rchars_1 != rchars_2) { /* fread failed to read the same portion. * program cannot continue */ perror("ERROR WHEN READING BLOCK"); exit(-1); } while (rchars_1-->0) { if (buff_f1[rchars_1] != buff_f2[rchars_1]) { /* Different characters */ fclose(f1); fclose(f2); pthread_exit("notdup"); } } /* Close streams */ fclose(f1); fclose(f2); pthread_exit("dup"); } int check_dup(const char *name_f1, const char *name_f2) { int num_blocks = 0; /* Number of 'blocks' to check */ int num_tsp = 0; /* Number of threads spawns */ int tsp_iter = 0; /* Iterator for threads spawns */ pthread_t *tsp_threads = NULL; thread_arg *tsp_threads_args = NULL; int tsp_threads_iter = 0; int thread_c_res = 0; /* Thread creation result */ int thread_j_res = 0; /* Thread join res */ int loop_res = 0; /* Function result */ int cursor; struct stat buf_f1; struct stat buf_f2; if (name_f1 == NULL || name_f2 == NULL) { /* Invalid input parameters */ perror("INVALID FNAMES\t"); return (-1); } if (stat(name_f1, &buf_f1) != 0 || stat(name_f2, &buf_f2) != 0) { /* Stat fails */ char emsg[255]; sprintf(emsg, "STAT() ERROR: %s %s\t", name_f1, name_f2); perror(emsg); return (-1); } if (buf_f1.st_size != buf_f2.st_size) { /* File have different sizes */ return (1); } /* Files have the same size, function exec. is continued */ num_blocks = (buf_f1.st_size / BLOCK_SIZE) + 1; num_tsp = (num_blocks / NUM_THREADS) + 1; cursor = 0; for (tsp_iter = 0; tsp_iter < num_tsp; tsp_iter++) { loop_res = 0; /* Create threads array for this spawn */ tsp_threads = malloc(NUM_THREADS * sizeof(*tsp_threads)); if (tsp_threads == NULL) { perror("TSP_THREADS ALLOC FAILURE\t"); return (-1); } /* Create arguments for every thread in the current spawn */ tsp_threads_args = malloc(NUM_THREADS * sizeof(*tsp_threads_args)); if (tsp_threads_args == NULL) { perror("TSP THREADS ARGS ALLOCA FAILURE\t"); return (-1); } /* Initialize arguments and create threads */ for (tsp_threads_iter = 0; tsp_threads_iter < NUM_THREADS; tsp_threads_iter++) { if (cursor >= buf_f1.st_size) { break; } tsp_threads_args[tsp_threads_iter].name_f1 = name_f1; tsp_threads_args[tsp_threads_iter].name_f2 = name_f2; tsp_threads_args[tsp_threads_iter].cursor = cursor; thread_c_res = pthread_create( &tsp_threads[tsp_threads_iter], NULL, check_block_dup, (void*)&tsp_threads_args[tsp_threads_iter]); if (thread_c_res != 0) { perror("THREAD CREATION FAILURE"); return (-1); } cursor+=BLOCK_SIZE; } /* Join last threads and get their status */ while (tsp_threads_iter-->0) { void *thread_res = NULL; thread_j_res = pthread_join(tsp_threads[tsp_threads_iter], &thread_res); if (thread_j_res != 0) { perror("THREAD JOIN FAILURE"); return (-1); } if (strcmp((char*)thread_res, "notdup")==0) { loop_res++; /* Closing other threads and exiting by condition * from loop. */ while (tsp_threads_iter-->0) { pthread_cancel(tsp_threads[tsp_threads_iter]); } } } free(tsp_threads); free(tsp_threads_args); if (loop_res > 0) { break; } } return (loop_res > 0) ? 1 : 0; } The function works fine (at least for what I've tested). Still, some guys from #C (freenode) suggested that the solution is overly complicated, and it may perform poorly because of parallel reading on hddisk. What I want to know: Is the threaded approach flawed by default ? Is fseek() so slow ? Is there a way to somehow map the files to memory and then compare them ?

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  • What does "===" mean?

    - by Stefan Konno
    I recently studied some code that I'm supposed to use for different reasons, it's unrelevant. The thing I've noticed is someone using the operator "===" which I can't make sense out of. I've tried it with a function and it corresponds in crazy ways. The language is PHP by the way. Does anyone know what the definition of this operator is, I can't even find it in the declaration of php operators.

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  • Why would bitmap outperform vector, as3?

    - by VideoDnd
    Why would bitmap outperform vector? My Flash is for a large Kiosk, with rich media requirements and must function accurately as a counter. I want to keep everything vector for scalability. When I did a simple FPS test, I noticed my Bitmap version performed perfectly, and the all vector file was noticeably slower. PLEASE EXPLAIN • vector performance• what graphic standards I can apply• solutions for using vector KIOSK TEST ANIMATION RESULTS • only text and bitmap perform well, not vector • background and clouds OK, but more layers slow it down

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  • LINQ Equivalent for Standard Deviation

    - by Steven
    Does LINQ model the aggregate SQL function STDDEV() (standard deviation)? If not, what is the simplest / best-practices way to calculate it? Example: SELECT test_id, AVERAGE(result) avg, STDDEV(result) std FROM tests GROUP BY test_id

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  • Vector addition of lists

    - by ntimes
    If I had a N lists each of length M, how could I write a nice clean function to return a single list of length M, where each element is the sum of the corresponding elements in the N lists? (starting to learn lisp - go easy!)

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  • Draw background for each cell in ObjectListField

    - by user315647
    Hi all, I am creating a blackberry apllication which pre-dominantly uses ObjectListFields..All i need now is to draw an image as a background for each cell. I know this is quiet possible but i am not getting hold of the procedure. if i draw bitmap in drawlistrow() function the bluehighlight gets into the background and the cell highlight becomes very hard to read......can anybody help me with a code snippet to get through this problem ....thanks...

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  • In C, do braces act as a stack frame?

    - by Claudiu
    If I create a variable within a new set of curly braces, is that variable popped off the stack on the closing brace, or does it hang out until the end of the function? For example: void foo() { int c[100]; { int d[200]; } //code that takes a while return; } Will d be taking up memory during the code that takes a while section?

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  • IE Overwrite window.top

    - by Dave
    I'm trying to convince a page that it is the window.top even though it is in an iframe. In FF you can do window.defineGetter('top', function() { return window}); in Webkit (Safari/Chrome) you can simply do window.top = window but in IE none of those methods work. Anyone done this before?

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  • GUI Application becomes unresponsive while http request is being done

    - by JW
    I have just made my first proper little desktop GUI application that basically wraps a GUI (php-gtk) interface around a SimpleTest Web Test case to make it act as a remote testing client. Each time the local The Web Test case runs, it sends an HTTP request to another SimpleTest case (that has an XHTML interface) sitting on my server. The application, allows me to run one local test that collates information from multiple remote tests. It just has a 'Start Test' button, 'Stop Test' button and a setting to increase/decrease the number of remote tests conducted in each HTTP Request. Each test-run takes about an hour to complete. The trouble is, most of the time the application is making http requests. Furthermore, whenever an HTTP Request is being made, the application's GUI is unresponsive. I have taken to making the application wait a few seconds (iterating through the Gtk::main_iteration ) between requests in order to give the user time to re-size the window, press the Stop button, etc. But, this makes the whole test run take a lot a longer than is necessary. <?php require_once('simpletest/web_tester.php'); class TestRemoteTestingClient extends WebTestCase { function testRunIterations() { ... $this->assertTrue($this->get($nextUrl), 'getting from pointer:'. $this->_remoteMementoPointer); $this->assertResponse(200, "checking response for " . $nextUrl ); $this->assertText('RemoteNodeGreen'); $this->doGtkIterationsForMinNSeconds($secs); ... } public function doGtkIterationsForMinNSeconds($secs) { $this->appendStatusMessage("Waiting " . $secs); $start = time(); $end = $start + $secs; while( (time() < $end) ) { $this->appendStatusMessage("Waiting " . ($end - time())); while(gtk::events_pending()) Gtk::main_iteration(); } } } Is there a way to keep the application responsive whilst, at the same time making an HTTP request? I am considering splitting the application into two, where: Test Controller Application - Acts as a settings-writer / report-reader and this writes to settings file and reads a report file. Test Runner Application - Acts as a settings-reader / report-writer and, for each iteration reads the settings file, Runs the test, then write a report. So to tell it to close down - I'd: Press the Stop Button on the 'Test Controller Application', which writes to the settings file, which is read by the 'Test Runner Application' which stops, then writes to the report file to say it stopped the 'Test Controller Application' reads the report and updates the status and so on... However, before I go ahead and split the application in two - I am wondering if there is any other obvious way to deal with, this issue. I suspect it is probably quite common and a well-trodden path. Also is there an easier way to send messages between two applications?

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  • Several numpy arrays with SWIG

    - by Petter
    I am using SWIG to pass numpy arrays from Python to C++ code: %include "numpy.i" %init %{ import_array(); %} %apply (float* INPLACE_ARRAY1, int DIM1) {(float* data, int n)}; class Class { public: void test(float* data, int n) { //... } }; and in Python: c = Class() a = zeros(5) c.test(a) This works, but how can I pass multiple numpy arrays to the same function?

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  • Zend_DB_Table Update problem

    - by davykiash
    Am trying to construct a simple update query in my model class Model_DbTable_Account extends Zend_Db_Table_Abstract { protected $_name = 'accounts'; public function activateaccount($activationcode) { $data = array( 'accounts_status' => 'active', ); $this->update($data, 'accounts_activationkey = ' . $activationcode); } However I get an SQLSTATE[42S22]: Column not found: 1054 Unknown column 'my activation code value' in 'where clause' error. What am I missing in Zend_Table update construct?

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  • javascript AOP advice to statements

    - by Paul
    Some javascript libraries, such as JQuery and Dojo, provide AOP APIs that can introduce before, after, or around advice to a function. Just wondering whether there is any javascript AOP libraries can introduce such advices to an individual statement?

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  • c declaraing varibles in blocks

    - by anon
    I know that in C++, I can declare variables pretty much everywhere. I recall once reading that in C, variables must be declared at the top of a function i.e. the following is invalid: void foo() { int good; if (...) { int bad; } } In the above code, is the declaraing of the bad varaible legal by C standards, or only legal due to a gcc extension? Thanks!

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  • insert c# code inside javascript

    - by niao
    Greetings, how can I inject c# code (my Model property) inside javascript? I want to do something like this: $(".star<%=Model.ROWGUID %>").mouseover(function() { var span = $(this).parent("span"); var newRating = $(this).attr("value"); setRating(span, newRating); });

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