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  • How to convert a function that returns a int to a function that returns a bool using boost::bind?

    - by user814628
    I have something like the following: struct A{ virtual int derp(){ if(herp()) return 1; else return 0; } void slurp(){ boost::function<bool(int x, int y> purp = /** boost bind derp to match lvalue sig **/; } } Any ideas? I want to create the function prup which basically calls derp and ignores the (x,y) passed in. I need something like bool purp(int x, int y){ return derp(); } but want to avoid creating it as a member function, and rather just create it locally if possible?

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  • FORTRAN function returning an array causes a segfault (calling from C++)

    - by Dane Larsen
    Basically, here's my problem. I'm calling someone else's FORTRAN functions from my C++ code, and it's giving me headaches. Some code: function c_error_message() character(len = 255) :: c_error_message errmsg(1:9) = 'ERROR MSG' return end That's the FORTRAN function. My first question is: Is there anything in there that would cause a segfault? If not, then second: What does that return? A pointer? I'm trying to call it with the following C statement: char *e = c_error_message_(); That causes a segfault. c_error_message(); That too causes a segfault. I declared c_error_message_() earlier on with the following code: extern"C" { char* c_error_message_(); } Would declaring a function with a different return type than the actual return type cause a segfault? I'm at a loss. Thanks for any replies.

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  • Generating an array of functions?

    - by Wordpressor
    I have a few PHP files filled with multiple functions. Let's call them functions1.php, functions2.php, functions3.php: function function_something( $atts ) { extract( something_atts( array( 'foo' => 'bar', 'bar' => 'foo, ), $atts ) ); return 'something'; } I'm loading these files within all_functions.php like this: require_once('functions1.php'); require_once('functions2.php'); require_once('functions3.php'); I'm wondering if it's possible to create an array of all these functions and their attributes? I'm thinking about something like: function my_functions() { require_once('functions1.php'); require_once('functions2.php'); require_once('functions3.php'); } And then some foreach loop, but I'm not sure how should it look like after all. I know this probably looks tricky, but I'm just curious if I'm able to list all my WordPress shortcodes without PHP's Reflection API :)

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  • JQuery.ajax success function returns empty

    - by viatropos
    I have a very basic AJAX function in JQuery: $.ajax({ url: "http://www.google.com", dataType: "html", success: function(data) { alert(data); } }); But the data is always an empty string, no matter what url I go to... Why is that? I am running this locally at http://localhost:3000, and am using JQuery 1.4.2. If I make a local response, however, like this: $.ajax({ url: "http://localhost:3000/test", dataType: "html", success: function(data) { alert(data); } }); ...it returns the html page at that address. What am I missing here?

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  • How to do manual DI with deep object graphs and many dependencies properly

    - by Fabian
    I believe this questions has been asked in some or the other way but i'm not getting it yet. We do a GWT project and my project leader disallowed to use GIN/Guice as an DI framework (new programmers are not going to understand it, he argued) so I try to do the DI manually. Now I have a problem with deep object graphs. The object hierarchy from the UI looks like this: AppPresenter-DashboardPresenter-GadgetPresenter-GadgetConfigPresenter The GadgetConfigPresenter way down the object hierarchy tree has a few dependencies like CustomerRepository, ProjectRepository, MandatorRepository, etc. So the GadgetPresenter which creates the GadgetConfigPresenter also has these dependencies and so on, up to the entry point of the app which creates the AppPresenter. Is this the way manual DI is supposed to work? doesn't this mean that I create all dependencies at boot time even I don't need them? would a DI framework like GIN/Guice help me here?

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  • Mimic an HTTPRequest and HTTPResponse object in Java

    - by Ankur
    How do I mimic an HTTPServletRequest and HTTPServletResponse object. The reason is I want to test the behaviour of some servlets. I know JUnit probably provides this functionality but I don't know how to use it (I will learn soon) and need to do this reasonably quickly. HTTPServletRequest and HTTPServletResponse are both interfaces so they can't be instantiated. There is a HttpServletRequestWrapper which implements HttpServletRequest but it doesn't seem to have any setParameter() type methods and HttpServletResponse doesn't seem to have any implementing classes at all. How can I test my code by passing a suitable HttpServletRequest object and then checking that the received HttpServletResponse object matches what I expect?

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  • "Initializing" the pointer in the separate function in C

    - by pechenie
    I need to do a simple thing, which I used to do many times in Java, but I'm stuck in C (pure C, not C++). The situation looks like this: int *a; void initArray( int *arr ) { arr = malloc( sizeof( int ) * SIZE ); } int main() { initArray( a ); // a is NULL here! what to do?! return 0; } I have some "initializing" function, which SHOULD assign a given pointer to some allocated data (doesn't matter). How should I give a pointer to a function in order to this pointer will be modified, and then can be used further in the code (after that function call returns)? Thanx for help.

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  • MS Detours Library, detouring non win api function

    - by flavour404
    Hi, I want to use the windows detours library to detour a non win api function. The function is part of the Qt library (QtGui4.dll). I am wondering how I would set up the function signature for : void QPainter::drawText ( const QPointF & position, const QString & text ) I had a go with this and it received my usual share of errors, a little explanation of requirements would be interesting as well: void (QPainter * real_drawText)(const QPointF & position, const QString & text) = drawText This is what they look like for TextOut, under the windows API: BOOL (WINAPI * Real_TextOut)(HDC a0, int a1, int a2, LPCWSTR a3, int a4) = TextOutW; BOOL WINAPI Mine_TextOut(HDC hdc,int X,int Y,LPCWSTR text,int textLen) { BOOL rv = Real_TextOut(hdc, X, Y, text, textLen); HWND hWindow = WindowFromDC(hdc); SendTextMessage(hWindow, text); return rv; } Thanks.

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  • Problems with listening for an event in child object in Actionscript

    - by Raigomaru
    I have two classes. The first one (the starting class): package { import flash.display.Sprite; import flash.events.KeyboardEvent; import tetris.*; public class TetrisGame extends Sprite { private var _gameWell:Well; public function TetrisGame() { _gameWell = new Well(); addChild(_gameWell); } } } The second: package tetris { import flash.display.Sprite; import flash.events.KeyboardEvent; public class Well extends Sprite { public function Well() { super(); addEventListener(KeyboardEvent.KEY_DOWN, onKeyboard); } private function onKeyboard(event:KeyboardEvent):void { //some code is here } } } But when I press any buttons on my keyboard, the child class Well doesn't have any reaction. What's the problem?

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  • how to wrap a function that only takes individual elements to make it take a list

    - by stevejb
    Hello, Say I have a function handed to me that I cannot change and must use as is. This function takes several objects in the form of oldFunction( object1, object2, object3, ...) where ... are other arguments. I want to write a wrapper to take a list of objects. My idea was this. sjb.ListWrapper <- function(myList,...) { lLen <- length(myList) myStr <- "" for( i in 1:lLen) { myStr <- paste(myStr, "myList[[", i , "]],",sep="") } myCode <- paste("oldFunction(", myStr, "...)") eval({myCode}) } However, the issue is that I want to use this from Sweave and I need the output of oldFunction to be printed. What is the right way to do this? Thanks.

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  • How to create Bitmap object from a Graphics object ?

    - by vi.su.
    How to create Bitmap object from a Graphics object ? I would like to read pixels from my Graphics object. for example, like, System.Drawing.BitMap.GetPixel(). I am trying to find out empty area (all white, or of any colour) inside a pdf document, to write some graphics / image. I have tried like this, but it is not working. why the following code is not working as expected ? // // System.Drawing.Bitmap // System.Drawing.Graphics // Bitmap b = new Bitmap(width, height, graphics); // // In this case, for any (i, j) values, Bitmap.GetPixel returns 0 // int rgb = b.GetPixel(i, j).ToArgb(); ( posting this question again in .net-only context, removing other library dependencies )

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  • CategoryName.find is not a function

    - by zurna
    I need to call a plugin inside a ajax call so it could be used on called&received data. But I got the following error. Error: CategoryName.find is not a function Source File: http://www.refinethetaste.com/FLPM/ Line: 82 I tried it as: $.ajax({ dataType: "xml", url: "/FLPM/content/home/index.cs.asp?Process=ViewVCategories", success: function(xml) { $(xml).find('row').each(function(){ var id = $(this).attr('id'); var CategoryName = $(this).find('CategoryName').text(); $("<div class='tab fleft'><a href='http://www.refinethetaste.com/FLPM/content/home/index.cs.asp?Process=ViewVideos&CATEGORYID="+ id +"'>"+ CategoryName + "</a></div>").appendTo("#VCategories"); CategoryName.find("div.row-title .tab").tabs("div.row-title div.panes > div"); }); } });

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  • how to have defined connection within function for pdo communication with DB

    - by Scarface
    hey guys I just started trying to convert my query structure to PDO and I have come across a weird problem. When I call a pdo query connection within a function and the connection is included outside the function, the connection becomes undefined. Anyone know what I am doing wrong here? I was just playing with it, my example is below. include("includes/connection.php"); function query(){ $user='user'; $id='100'; $sql = 'SELECT * FROM users'; $stmt = $conn->prepare($sql); $result=$stmt->execute(array($user, $id)); // now iterate over the result as if we obtained // the $stmt in a call to PDO::query() while($r = $stmt->fetch(PDO::FETCH_ASSOC)) { echo "$r[username] $r[id] \n"; } } query();

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  • Mandatory Parameters in Request object (WCF)

    - by Martin Moser
    lHi, I'm currently writing a WCF service. One of those methods get's a request object and returns a response object. In the request there are a couple of value-type members. Is there a way to define members are mandatory in the declarative way? I'm in an early stage of development and I don't want to start with versioning now. In addition I don't want to have method sig with 25 parameters, therefore I created the request object. The problem I have is that due to the value-types, I can never be sure if the consumer of the service intended to have the default value in there, or it was just by lazyness. On consumer side you don't easily detect that you probably missed that property. So I would like to have something that forces the caller of the service to provide an value, and if not he ideally get's a compile-time error. any ideas? tia, Martin

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  • Clone LINQ To SQL object Extension Method throws object dispose exception....

    - by gtas
    Hello all, I have this extension method for cloning my LINQ To SQL objects: public static T CloneObjectGraph<T>(this T obj) where T : class { var serializer = new DataContractSerializer(typeof(T), null, int.MaxValue, false, true, null); using (var ms = new System.IO.MemoryStream()) { serializer.WriteObject(ms, obj); ms.Position = 0; return (T)serializer.ReadObject(ms); } } But while i carry objects with not all references loaded, while qyuerying with DataLoadOptions, sometimes it throws the object disposed exception, but thing is I don't ask for references that is not loaded (null). e.g. I have Customer with many references and i just need to carry on memory the Address reference EntityRef< and i don't Load anything else. But while i clone the object this exception forces me to load all the EntitySet< references with the Customer object, which might be too much and slow down the application speed. Any suggestions?

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  • Object's field cannot be accessed after $.ajax call in success function - it is undefined

    - by dragonfly
    I have a $.ajax call and and server returns JSON. This is my call: var result; // tmp variable just for playing with Chrome console $.ajax({ type: "GET", url: "ashxJSON.ashx", data: { name: "some sample data" }, contentType: "application/json; charset=utf-8", dataType: "json", success: function (msg) { result = msg; console.log(msg); $("#output").append("<p>" + msg.message + "</p>"); }, error: function (jqXHR, textStatus, errorThrown) { console.log(textStatus); console.log(errorThrown); } }); Server returns exactly this string: { "messsage": "Hello World to ..."} And now, when I: console.log(msg) I see: Object messsage: "Hello World to..." proto: Object But when I access msg.message or msg["message"] I see: undefined What is wrong with me / that msg object?

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  • Storing a reference to an object in C#

    - by Jack
    I was wondering how one could store a reference to an object in .net. That is, I would like something like the following code (note, of course, that the following code may be way off from how to actually do it): class Test { private /*reference to*/ Object a; public Test(ref int a) { this.a = a; this.a = ((int)this.a) + 1; } public Object getA() { return this.a; } } /* * ... */ static void Main(string[] args) { int a; a=3; Test t = new Test(ref a); Console.WriteLine(a); Console.WriteLine(t.getA()); Console.ReadKey(); } To produce the following output: 4 4 Ideally, I would like to do this without writing a wrapper class around the integer. In other words, I think I want pointers in .Net.

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  • Inverse Factorial Function (Prolog)

    - by user2796815
    I have to write a Prolog program to computer the inverse of factorial function without using division. I was also given the note: "the inverse of a function is not necessarily a function". I have this is a normal factorial predicate.. fact(0,1). fact(N,F) :- N0, N1 is N-1, fact(N1,F1), F is N * F1. I've read on some other posts that you should be able to just switch around the arguments, but that doesn't seem to be the case with this version. Could anyone help me out with figuring out why?

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  • How to sum properties of the objects within an array in Ruby

    - by Ernst Fitschen
    I understand that in order to sum array elements in Ruby one can use the inject method, i.e. array = [1,2,3,4,5]; puts array.inject(0, &:+) But how do I sum the properties of objects within an object array e.g. There's an array of objects and each object has a property "cash" for example. So I want to sum their cash balances into one total. Something like... array.cash.inject(0, &:+) (but this doesn't work) I realise I could probably make a new array composed only of the property cash and sum this, but I'm looking for a cleaner method if possible!

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  • How to get all the updates for a Second Life Object (prim) using LIBOMV

    - by sura
    Hi All, In Second Life, I have an avatar and a primitive object that are moving with changing velocity. I use the LIBOMV library to create a text client to Second Life. Using this LIBOMV text client, I am trying to record the update packets of that avatar and object that are being sent to my text client by the server. I get frequent update packets for the avatar as its velocity changes, but I do not get update packets for the object that frequently, although it has a changing velocity. I would like to know whether there is any special setting I should use in order to solve this problem. /Su

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  • Jquery Delay Function Calls

    - by fizgig07
    I'm trying to find a way to delay all code that takes place after I make a service call. The reason for this delay is that my service returns code necesarry for the following functions and the result I pass is to these following functions is undefined. I have tried attaching the setTimeout() to the function that is called directly after the service call, but then it just skips the function I set the timeout on and jumps to the next function...My web method that I am calling is not that big and is not doing anything that is too intensive public bool GetSpreadsheetStatusForAdmin(string cacId) { SpreadSheetStatus result = new SpreadSheetStatus(); List<Data.Spreadsheet> spreadsheets = SpreadsheetManager.GetUserSpreadsheets(GetCurrent.Identity); if (spreadsheets.Count != 0) { foreach (Data.Spreadsheet spreadsheet in spreadsheets) { if (spreadsheet.Status == SpreadsheetStatus.Pending) { return true; } } } return false; } I had found the delay() and thought that might work, but I don't have jquery 1.4 and can't use it as of yet. is there anything that can help..?

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  • function to find common rows between more than two data frames in R

    - by biohazard
    I have 4 data frames, and would like to find the rows whose values in a certain column do not exist in any of the other data frames. I wrote this function: #function to test presence of $Name in 3 other datasets common <- function(a, b, c, d) { is.B <- is.numeric(a$Name %in% b$Name) == 1 is.C <- is.numeric(a$Name %in% c$Name) == 1 is.D <- is.numeric(a$Name %in% d$Name) == 1 t <- as.numeric(is.B & is.C & is.D) t } However, the output is always t = 0. This means that it tells me that there are no unique rows in any data sets, even though the datas frames have very different numbers of rows. Since there are no duplicate rows in any of the data frames, I should be getting t = 1 for at least some rows in the biggest dataset. Can someone figure out what I got wrong?

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  • How do I introduce row names to a function in R

    - by Tahnoon Pasha
    Hi I have a utility function I've put together to insert rows into a dataframe below. If I was writing out the formula by hand I would put something like newframe=rbind(oldframe[1:rownum,],row_to_insert=row_to_insert,oldframe[(rownum+1:nrow(oldframe),] to name row_to_insert. Could someone tell me how to do this in a function? Thanks insertrows=function (x, y, rownum) { newframe = rbind(y[1:rownum, ], x, y[(rownum + 1):nrow(y), ]) return(data.frame(newframe)) } MWE of some underlying data added below financials=data.frame(sales=c(100,150,200,250),some.direct.costs=c(25,30,35,40),other.direct.costs=c(15,25,25,35),indirect.costs=c(40,45,45,50)) oldframe=t(financials) colnames(oldframe)=make.names(seq(2000,2003,1)) total.direct.costs=oldframe['some.direct.costs',]+oldframe['other.direct.costs',] newframe=total.direct.costs n=rownum=3 oldframe=insertrows(total.direct.costs=newframe,oldframe,n)

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  • Bullet physics engine, how to freeze an object?

    - by Markus
    Using Bullet 2.76 I'm trying to freeze an object (rigid body) so that it instantly stops moving, but still responds to collisions. I tried setting it's activation state to DISABLE_SIMULATION, but then it's virtually nonexistent to other objects. Furthermore, if objects "collide" with it when it's disabled, strange things begin to happen (object's falling through static bodies, etc.) I suppose, temporarily converting it to a static rigid body could work, but is there an existing "native" way to achieve this on Bullet's side? Edit: Is there a way to turn off gravity for a specific object?

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  • How do you create a formula that has diminishing returns?

    - by egervari
    I guess this is a math question and not a programming question, but what is a good way to create a formula that has diminishing returns? Here are some example points on how I want the curve to look like. f(1) = 1 f(1.5)= .98 f(2) = .95 f(2.5) = .9 f(3) = .8 f(4) = .7 f(5) = .6 f(10) = .5 f(20) = .25 Notice that as the input gets higher, the percentage decreases rapidly. Is there any way to model a function that has a very smooth and accurate curve that says this? Another way to say it is by using a real example. You know in Diablo II they have Magic Find? There are diminishing returns for magic find. If you get 100%, the real magic find is still 100%. But the more get, your actual magic find goes down. So much that say if you had 1200, your real magic find is probably 450%. So they have a function like: actualMagicFind(magicFind) = // some way to reduced magic find

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