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• C# debug vs release performance

  - by sagie

  Hi. I've encountered in the following paragraph: “Debug vs Release setting in the IDE when you compile your code in Visual Studio makes almost no difference to performance… the generated code is almost the same. The C# compiler doesn’t really do any optimisation. The C# compiler just spits out IL… and at the runtime it’s the JITer that does all the optimisation. The JITer does have a Debug/Release mode and that makes a huge difference to performance. But that doesn’t key off whether you run the Debug or Release configuration of your project, that keys off whether a debugger is attached.” The source is here and the podcast is here. Can someone direct me to a microsoft an article that can actualy prove this?

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• C++ -malign-double compiler flag

  - by Martin

  I need some help on compiler flags in c++. I'm using a library that is a port to linux from windows, that has to be compiled with the -malign-double flag, "for Win32 compatibility". It's my understanding that this mean I absolutely have to compile my own code with this flag as well? How about other .so shared libraries, do they have be recompiled with this flag as well? If so, is there any way around this? I'm a linux newbie (and c++), so even though I tried to recompile all the libraries I'm using for my project, it was just too complicated to recursively find the source for all the libraries and the libraries they're dependent on, and recompile everything.

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• Windows Services -- High availability scenarios and design approach

  - by Vadi

  Let's say I have a standalone windows service running in a windows server machine. How to make sure it is highly available? 1). What are all the design level guidelines that you can propose? 2). How to make it highly available like primary/secondary, eg., the clustering solutions currently available in the market 3). How to deal with cross-cutting concerns in case any fail-over scenarios If any other you can think of please add it here .. Note: The question is only related to windows and windows services, please try to obey this rule :)

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• Override app.config settings embedded into a MSI?

  - by Seth Petry-Johnson

  I have a .NET solution with an installer project that generates an MSI. One of the projects installed by the MSI contains an App.Config file. It appears that the values of that config file are embedded into the MSI at compile time. Is there a way to override them at runtime? For instance, the App.Config I'm working with sets the URL of a web service that the installer talks to. Is it possible to override this URL at runtime, so that I don't have to recompile the MSI if the URL changes?

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• PHP exec not working with gcc

  - by teehoo

  I just spent a few hours pulling my hair out over this. I'm trying to get gcc to compile a file from within PHP. $command = "/usr/bin/gcc /var/www/progpad/temp/tNu7rq.c -o /var/www/progpad/temp/tNu7rq.out"; exec($command, $output, $returnVal); echo $returnVal."<br />"; //returns 1 echo json_encode($output); //returns [] I'm running this on my own ubuntu server and both /var/www/progpad/ /var/www/progpad/temp/ have chmod 777 set. If I copy and paste the command string, and paste it into the terminal it works perfectly. Also if I replace the command string with something like $command = "echo test > test.txt"; Then this has no problem creating the text file. What could I possibly be doing wrong here???

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• Why does derivative trading position always require C++ knowledge?

  - by Jeffrey

  I’ve never worked in trading environment before and I was curious to see that few of the trading houses seem to use C# but most of them do heavily rely on C++. Why is it? Is it because C++ is better performance wise? Is it because of legacy code base? Is it because cross platform issue? What about dynamic languages (ruby, python)? Are they too slow for this kind of work in terms of performance? Updated: If realibility and performance are important would "Erlang" be the "next big thing" in trading platform?

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• Is it possible to build a Mac binary on a non-Mac unix machine?

  - by nbolton

  I would like to set up a Mac buildbot slave, but unfortunately it's not possible to install Mac OS X 10.5 on my XenServer hypervisor. So, I've had an idea, but not quite sure whether or not it'll work. The application is C++, and on Mac it's compile using GNU Make. I have a Mac desktop PC, and I was hoping I could copy the .h and .lib files on to a Linux box, and try to build against the Mac headers: #include <mach-o/dyld.h> #include <AvailabilityMacros.h>

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• stop the CSS filter property cascading

  - by Ayoub

  I tried to make box-shadow affect work cross browsers, in order to make ie work I used "filter" property but the effect cascades to the child element (in my case a span) I tried to stop it by using filter : none but it didn't work searched the web but I couldn't find a solution. please help me solve this problem. HTML code : <div id="shadow"> <span>text text</span> </div> CSS code : #shadow{ -moz-box-shadow: 3px 3px 4px #000; -webkit-box-shadow: 3px 3px 4px #000; box-shadow: 3px 3px 4px #000; /* For IE 8 */ -ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000')"; /* For IE 5.5 - 7 */ filter: progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000'); }

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• Forcing GWT to assume List is implemented as ArrayList

  - by joecks

  For some reason I'm stucked with model classes using List as Collection Type and I would like to use the model on the client side. However GWT of course fails serializing java.util.List. However all implementations of List in this model are based on ArrayList. So is it possible to tell GWT to assume List is ArrayList? Edit GWT fails on compile time, since a possible candidate for List is also java.util.Collections.SingeltonList - which can not be compiled. I'm using GWT 2.1 and Java 1.6 .

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• Compatible types and structures in C

  - by Oli Charlesworth

  I have the following code: int main(void) { struct { int x; } a, b; struct { int x; } c; struct { int x; } *p; b = a; /* OK */ c = a; /* Doesn't work */ p = &a; /* Doesn't work */ return 0; } which fails to compile under GCC (3.4.6), with the following error: test.c:8: error: incompatible types in assignment test.c:9: warning: assignment from incompatible pointer type Now, from what I understand (admittedly from the C99 standard), is that a and c should be compatible types, as they fulfill all the criteria in section 6.2.7, paragraph 1. I've tried compiling with std=c99, to no avail. Presumably my interpretation of the standard is wrong?

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• C++ conditional compilation

  - by Shaown

  I have the following code snippet #ifdef DO_LOG #define log(p) record(p) #else #define log(p) #endif void record(char *data){ ..... ..... } Now if I call log("hello world") in my code and DO_LOG isn't defined, will the line be compiled, in other words will it eat up the memory for the string "hello world"? P.S. There are a lot of record calls in the program and it is memory sensitive, so is there any other way to conditionally compile so that it only depends on the #define DO_LOG? Thanks in advance.

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• Simple and efficient distribution of C++/Boost source code (amalgamation)

  - by Arrieta

  Hello: My job mostly consists of engineering analysis, but I find myself distributing code more and more frequently among my colleagues. A big pain is that not every user is proficient in the intricacies of compiling source code, and I cannot distribute executables. I've been working with C++ using Boost, and the problem is that I cannot request every sysadmin of every network to install the libraries. Instead, I want to distribute a single source file (or as few as possible) so that the user can g++ source.c -o program. So, the question is: can you pack the Boost libraries with your code, and end up with a single file? I am talking about the Boost libraries which are "headers only" or "templates only". As an inspiration, please look at the distribution of SQlite or the Lemon Parser Generator; the author amalgamates the stuff into a single source file which is trivial to compile. Thank you.

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• How does one write extconf.rb files when one extension includes header files from another?

  - by mohawkjohn

  This is a follow-up question for: Multiple Ruby modules under one directory What happens if these extensions include each other? For example, you have the following structure: ext/foo ext/bar In ext/bar/bar.h, you have a #include "foo.h" foo.h and foo.cpp compile to form foo.o, to make life a little more complicated. Finally, it is necessary that foo and bar be separate extensions. How is this managed? I can't figure out how to add ../foo to the search path for bar.h, primarily. Symbolic links seem hack-ish.

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• Setting ID to a control inside repeater itemtemplate

  - by toraan

  Inside repeater's itemtemplate I have a Panel server control. I need to assign special Id for it, because I need to work with some javascript functions that use this Id. In repeater ItemDataBound event I have this: pnlButtonsPanel.ID = pnlButtonsPanel.ID + DataBinder.Eval(e.Item.DataItem, "ID"); But this solution is not good because after a postback the page is re -rendered and I lose the new ID. (And I don't want to rebind repeater after every postback) I tried to set the ID on aspx page like that: <asp:Panel id='<%# Eval("ID") %>' and some other variations but always get compile errors.

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• "Invalid Procedure Call or Argument", but only in a compiled or P-Code EXE

  - by Rob Perkins

  I have a VB6 program which I've been maintaining for ten years. There is a subroutine in the program called "Prepare Copy", which looks like this: Public Sub PrepareCopy() Set CopiedShapes = New Collection End Sub Where CopiedShapes is dimmed out as a VB6 Collection. That code is now kicking out a Runtime Error 5 -- Invalid Procedure Call or Argument. It appears from the interstitial debugging code that the error arises between the Public Sub PrepareCopy() and the Set CopiedShapes = New Collection lines. That's right. The VB6 error is happening between two lines of my code. I can think of no other explanation for this. It's behaving this way on my development machine and two client computers. It is only happening in runtime code, and does not appear to make a difference whether I compile it or use P-Code What I'm asking for here is speculation as to what causes this sort of thing to happen.

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• Creating Ruby applications for Windows.

  - by Omega

  I want to develop a Windows application. Honestly I care little about cross-platforms for now (but still would be good) I want to use Ruby, since it has quite a simple syntax and is so.. well, simple and easy to learn. My application is like a "game level creator", where you can design your own level and then run it with another application which is a "game level player" by reading the project file created by the creator app. You get the idea. Now, I got a new PC and is completely clean. Absolutely no trace of my old Ruby experiments and fails. First of all, I will need to choose a GUI platform for my Ruby application! Can you recommend me one? I have heard of Shoes and Tk, but want to know what you think.

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• What's wrong with the following code ?

  - by dada

  #include <iostream> #include <string> using namespace std; int main(void) { string a; cin>>a; a.erase(a.end()-1); a.erase(a.begin()+1); string ge = "oae"; a.insert(a.begin()+1, ge); cout<<a<<endl; return 0; } It doesn't compile and i don't know why. Can you tell me what's wrong

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• How can I concatenate two mp3 files with different bit rates

  - by Scott

  I have FFmpeg installed on my linux web server. When I execute the following code, I have intermittent results. I think I have figured out that the MP3s do not compile when they have different bitrates. exec ('cat '. $pair['source_file'] . ' ' . $pair['translated_word_file'] . '>' . $temp_mp3); I might have found some articles online that reference taking them apart and then bundling them back together at a consistent bitrates. I have confirmed that this won't really work with basic "cat" function and that "sox" can be used IF they have the same sample rate. The issue now becomes "What is the best way to get them to the same sample rate?"

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• Creating a simple wcf service publishing it to my webhotel, and get it to work

  - by H4mm3rHead

  Hi, This seems to be a recurring problem to me. I want to get started doing wcf services. I create a new Wcf Service Library, compile it, and publish it using FTP to my providers webhotel. But its not working. I somehow cant get access. I dont want some fancy security model - i just want to get a hole through to my simple webservice. Seems that its the part when i publish it to my webhotel (in a subdomain) that breaks the webservice - its working perfectly when starting it locally. How to proceed anyone?

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• Hudson jobs won't call javac?

  - by Dissonant

  Hi, I have just set up Hudson on my server. For some reason, my build will not call javac to compile my builds...? I have set the path to the JDK in the Manage Hudson area, and it seems to recognise it (doesn't give me a warning). Is there something else I'm supposed to do? Here's a sample console output of one of my jobs (note how javac isn't called at all): Started by user admin Checking out svn+ssh://myhost.com/Project1 A /src/Program.java A build.xml U At revision 119 no change for svn+ssh://myhost.com/Project1 since the previous build Finished: SUCCESS

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• holding session state with zend framework in iframe?

  - by princyp

  I have a php site optimized for iphone, its currently running inside of an iframe in a uiwebview objective c wrapper. Everything currently works except for the sessions inside of the iframe, Im assuming this is due to the cross domain issue with iframes and sessions? my solution is to save the sessions to the db. Is this the best solution? Will this even solve my problem? should I use memcache instead? are there any good tutorials for doing this? I havent been able to find an easy to implement solution for saving the session data, im a bit confused by the bootstrap.php and I keep getting this error when I try to add session saving: 'no adapter found for Zend_Session_SaveHandler_DbTable' any help would be greatly appreciated, thank you

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• QList as a function parameter - Linking Error - LNK2019

  - by user2445136

  I have an issue with QList as a function parameter and I'll be glad if you can assist me. I have this code for example: void SpinBoxList_Enable(QList spinBoxList) { foreach(QWidget mWidget,*spinBoxList) mWidget-setEnabled(false); } and in the implemantation file I use the QList variable as a pointer: SpinBoxList_Enable(&controlBoardSpinBoxList); ( controlBoardSpinBoxList is a variable of QList ). The Function ToggleBoards_Slot(bool) is a slot that uses When I compile, I get this error message: 1cmosaixserialnumber.obj : error LNK2019: unresolved external symbol "private: void __cdecl CMosaixSerialNumber::SpinBoxList_Disable(class QList *)" (?SpinBoxList_Disable@CMosaixSerialNumber@@AEAAXPEAV?$QList@PEAVQWidget@@@@@Z) referenced in function "public: void __cdecl CMosaixSerialNumber::ToggleBoards_Slot(bool)" (?ToggleBoards_Slot@CMosaixSerialNumber@@QEAAX_N@Z) 1cmosaixserialnumber.obj : error LNK2019: unresolved external symbol "private: void __cdecl CMosaixSerialNumber::SpinBoxList_Enable(class QList *)" (?SpinBoxList_Enable@CMosaixSerialNumber@@AEAAXPEAV?$QList@PEAVQWidget@@@@@Z) referenced in function "private: void __cdecl CMosaixSerialNumber::on_ControlBoardCheckBox_StateChanged(int)" (?on_ControlBoardCheckBox_StateChanged@CMosaixSerialNumber@@AEAAXH@Z) How can I fix this ? Thanks, EVH671

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• initializing properties with private sets in .Net

  - by Martin Neal

  public class Foo { public string Name { get; private set;} // <-- Because set is private, } void Main() { var bar = new Foo {Name = "baz"}; // <-- This doesn't compile /*The property or indexer 'UserQuery.Foo.Name' cannot be used in this context because the set accessor is inaccessible*/ using (DataContext dc = new DataContext(Connection)) { // yet the following line works. **How**? IEnumerable<Foo> qux = dc.ExecuteQuery<Foo>( "SELECT Name FROM Customer"); } foreach (q in qux) Console.WriteLine(q); } I have just been using the private modifier because it works and kept me from being stupid with my code, but now that I need to create a new Foo, I've just removed the private modifier from my property. I'm just really curious, why does the ExecuteQuery into an IEnumerable of Foo's work?

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• Get row id datatables

  - by Syed Haider Hassan

  ok. i have searched the internet and tried many things but nothing seems to work for me.. i am now getting upset of this datatables. I found 1 way which some ppl on net says works for them and it is giving me strange problem. if you see the image, when i use the function fnGetPosition, it just cross out.. i don't know why other users over net have no issue on it.. All i am trying to get is FormID, if there is any other way please help me get the ID.

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• Document key usage in Dictionary

  - by phq

  How can I document the key usage in a Dictionary so that it shows in Visual studio when coding using that object? I'm looking for something like: /// <param name="SpecialName">That Special Name</param> public Dictionary<string,string> bar; So far the best attempt has been to write my own class: public class SpecialNameDictionary : IDictionary<string, string> { private Dictionary<string, string> data = new Dictionary<string, string>(); /// <param name="specialName">That Special Name</param> public string this[string specialName] { get { return data[specialName]; } } } But It adds a lot of code that doesn't do anything. Additionally I must retype every Dictionary method to make it compile. Is there a better way to achive the above?

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