operator module - Page 27

Which programming languages, other than C++, support operator overloading?

New Visual Studio 2012 Project Templates for DotNetNuke

Earlier this month Microsoft put the bits up for Visual Studio 2012 RTM out on MSDN Subscriber downloads, and during the first two weeks of September they will officially be releasing Visual Studio 2012. I started working with VS2012 late in the release candidate cycle, doing some DNN module development using my templates at http://christoctemplate.codeplex.com . These templates work fine in Visual Studio 2012 from my testing, but they still face the same problem that they had in Visual Studio 2008...(read more)

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Script throwing unexpected operator when using mysqldump

- by Astron

A portion of a script I use to backup MySQL databases has stopped working correctly after upgrading a Debian box to 6.0 Squeeze. I have tested the backup code via CLI and it works fine. I believe it is in the selection of the databases before the backup occurs, possibly something to do with the $skipdb variable. If there is a better way to perform the function then I'm will to try something new. Any insight would be greatly appreciated. $ sudo ./script.sh [: 138: information_schema: unexpected operator [: 138: -1: unexpected operator [: 138: mysql: unexpected operator [: 138: -1: unexpected operator Using bash -x script here is one of the iterations: + for db in '$DBS' + skipdb=-1 + '[' test '!=' '' ']' + for i in '$IGGY' + '[' mysql == test ']' + : + '[' -1 == -1 ']' ++ /bin/date +%F + FILE=/backups/hostname.2011-03-20.mysql.mysql.tar.gz + '[' no = yes ']' + /usr/bin/mysqldump --single-transaction -u root -h localhost '-ppassword' mysql + /bin/tar -czvf /backups/hostname.2011-03-20.mysql.mysql.tar.gz mysql.sql mysql.sql + rm -f mysql.sql Here is the code. if [ $MYSQL_UP = "yes" ]; then echo "MySQL DUMP" >> /tmp/update.log echo "--------------------------------" >> /tmp/update.log DBS="$($MYSQL -u $MyUSER -h $MyHOST -p"$MyPASS" -Bse 'show databases')" for db in $DBS do skipdb=-1 if [ "$IGGY" != "" ] ; then for i in $IGGY do [ "$db" == "$i" ] && skipdb=1 || : done fi if [ "$skipdb" == "-1" ] ; then FILE="$DEST$HOST.`$DATE +"%F"`.$db.mysql.tar.gz" if [ $ENCRYPT = "yes" ]; then $MYSQLDUMP -u $MyUSER -h $MyHOST -p"$MyPASS" $db > $db.sql && $TAR -czvf - $db.sql | $OPENSSL enc -aes-256-cbc -salt -out $FILE.enc -k $ENC_PASS && rm -f $db.sql else $MYSQLDUMP --single-transaction -u $MyUSER -h $MyHOST -p"$MyPASS" $db > $db.sql && $TAR -czvf $FILE $db.sql && rm -f $db.sql fi fi done fi

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widget within module in Yii

- by Karolis

I'm trying to create a widget within the module and then load that widget from 'outside' of the module. More particularly I'm using user module written by someone else. I don't want to have a separate page for displaying a login form, therefore I tried to make a CPortlet/widget (confusion) displaying the login form. Basically, I've moved the code from LoginController into that widget. Then I try to display the widget on some random page by <?php $this->widget('user.components.LoginForm'); ?> However, I get an error CWebApplication does not have a method named "encrypting". in UserIdentity class in this line: else if(Yii::app()->controller->module->encrypting($this->password)!==$user->password) This happens, because I'm basically trying to execute this code within context of the app and not the module. Thus the "Yii::app()-controller-module" trick doesn't really work as expected. What am I doing wrong:-\ Is there a better way to achieve this. I.e. display that login form in some other page, which is normally displayed by accessing login controller within user module (user/login) or is a widget the right way of doing it? Thanks.

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Guru of the Week 2 no match for the operator==

- by Adam

From Guru of the Week 2. We have the function: string FindAddr(const list<Employee> l, string name) { for( list<Employee>::const_iterator i = l.begin(); i != l.end(); i++) { if( *i == name ) // here will be compilation error { return (*i).addr; } } return ""; } I added dummy Employee class to that: class Employee { string n; public: string addr; Employee(string name) : n(name) {} Employee() {} string name() const { return n; } operator string() { return n; } }; And got compilation error: error: no match for ‘operator==’ in ‘i.std::_List_iterator<_Tp>::operator* [with _Tp = Employee]() == name’ It works only if add operator== to Employee. But, Herb Sutter wrote that: The Employee class isn't shown, but for this to work it must either have a conversion to string or a conversion ctor taking a string. But Employee has a conversion function and conversion constructor as well. GCC version 4.4.3. Compiled normally, g++ file.cpp without any flags. There should be implicit conversion and it should work, why it doesn't?

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operator << : std::cout << i << (i << 1);

- by Oops

Hi, I use the stream operator << and the bit shifting operator << in one line. I am a bit confused, why does code A) not produce the same output than code B)? A) int i = 4; std::cout << i << " " << (i << 1) << std::endl; //4 8 B) myint m = 4; std::cout << m << " " << (m << 1) << std::endl; //8 8 class myint: class myint { int i; public: myint(int ii) { i = ii; } inline myint operator <<(int n){ i = i << n; return *this; } inline operator int(){ return i; } }; thanks in advance Oops

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How can a wix custom action dll call be made to use the debug runtime via a merge module?

- by Benj

I'm trying to create a debug build with a corresponding debug installer for our product. I'm new to Wix so please forgive any naivety contained herein. The debug Dlls in my project are dependent on both the VS2008 and the VS2008SP1 debug runtimes. I've created a merge module feature in wix to bundle those runtimes with my installer. <Include xmlns="http://schemas.microsoft.com/wix/2006/wi">    <DirectoryRef Id="TARGETDIR">  <Merge Id="AtlFiles_x86" SourceFile="$(env.CommonProgramFiles)\Merge Modules\Microsoft_VC90_ATL_x86.msm" DiskId="1" Language="1033"/> <Merge Id="AtlPolicy_x86" SourceFile="$(env.CommonProgramFiles)\Merge Modules\policy_9_0_Microsoft_VC90_ATL_x86.msm" DiskId="1" Language="1033"/> <Merge Id="CrtFiles_x86" SourceFile="$(env.CommonProgramFiles)\Merge Modules\Microsoft_VC90_DebugCRT_x86.msm" DiskId="1" Language="1033"/> <Merge Id="CrtPolicy_x86" SourceFile="$(env.CommonProgramFiles)\Merge Modules\policy_9_0_Microsoft_VC90_DebugCRT_x86.msm" DiskId="1" Language="1033"/> <Merge Id="MfcFiles_x86" SourceFile="$(env.CommonProgramFiles)\Merge Modules\Microsoft_VC90_DebugMFC_x86.msm" DiskId="1" Language="1033"/> <Merge Id="MfcPolicy_x86" SourceFile="$(env.CommonProgramFiles)\Merge Modules\policy_9_0_Microsoft_VC90_DebugMFC_x86.msm" DiskId="1" Language="1033"/>  <?if $(env.Platform) = "x64" ?> <Merge Id="AtlFiles_x64" SourceFile="$(env.CommonProgramFiles)\Merge Modules\Microsoft_VC90_ATL_x86_x64.msm" DiskId="1" Language="1033"/> <Merge Id="AtlPolicy_x64" SourceFile="$(env.CommonProgramFiles)\Merge Modules\policy_9_0_Microsoft_VC90_ATL_x86_x64.msm" DiskId="1" Language="1033"/> <Merge Id="CrtFiles_x64" SourceFile="$(env.CommonProgramFiles)\Merge Modules\Microsoft_VC90_DebugCRT_x86_x64.msm" DiskId="1" Language="1033"/> <Merge Id="CrtPolicy_x64" SourceFile="$(env.CommonProgramFiles)\Merge Modules\policy_9_0_Microsoft_VC90_DebugCRT_x86_x64.msm" DiskId="1" Language="1033"/> <Merge Id="MfcFiles_x64" SourceFile="$(env.CommonProgramFiles)\Merge Modules\Microsoft_VC90_DebugMFC_x86_x64.msm" DiskId="1" Language="1033"/> <Merge Id="MfcPolicy_x64" SourceFile="$(env.CommonProgramFiles)\Merge Modules\policy_9_0_Microsoft_VC90_DebugMFC_x86_x64.msm" DiskId="1" Language="1033"/> <?endif?> </DirectoryRef> <Feature Id="MS2008_SP1_DbgRuntime" Title="VC2008 Debug Runtimes" AllowAdvertise="no" Display="hidden" Level="1">  <MergeRef Id="AtlFiles_x86"/> <MergeRef Id="AtlPolicy_x86"/> <MergeRef Id="CrtFiles_x86"/> <MergeRef Id="CrtPolicy_x86"/> <MergeRef Id="MfcFiles_x86"/> <MergeRef Id="MfcPolicy_x86"/>  <?if $(env.Platform) = "x64" ?> <MergeRef Id="AtlFiles_x64"/> <MergeRef Id="AtlPolicy_x64"/> <MergeRef Id="CrtFiles_x64"/> <MergeRef Id="CrtPolicy_x64"/> <MergeRef Id="MfcFiles_x64"/> <MergeRef Id="MfcPolicy_x64"/> <?endif?> </Feature>  </Include> If I'm doing a debug build of the installer, I include that feature like so:  <?if $(var.Configuration) = "Debug"?> <?include ..\includes\MS2008_SP1_DbgRuntime.wxi?> <?endif?> The only problem is that my installer also includes a custom action which is also dependent on the debug runtime:  <Binary Id="InstallPrivateKey" SourceFile="..\InstallPrivateKey\win32\$(var.Configuration)\InstallPrivateKey.dll"></Binary> <CustomAction Id='InstallKey' BinaryKey='InstallPrivateKey' DllEntry='InstallPrivateKey'/> So how can I package the debug run time in such a way that the custom action also has access to it?

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TF30004: The New Team Project Wizard encountered an unexpected error while initializing the Microsof

- by Frozzare

Hello, i get this error when i trying to create a new project in team project. The server is right, i check all ports. I don't now what i should do now, can't find any good information 2009-09-19 01:45:41Z | Module: Internal | Team Foundation Server proxy retrieved | Completion time: 0.338 seconds 2009-09-19 01:45:41Z | Module: Internal | The template information for Team Foundation Server "TFSServer01" was retrieved from the Team Foundation Server. | Completion time: 0.099 seconds 2009-09-19 01:45:41Z | Module: Wizard | Retrieved IAuthorizationService proxy | Completion time: 0.404 seconds 2009-09-19 01:45:41Z | Module: Wizard | TF30227: Project creation permissions retrieved | Completion time: 0.015 seconds 2009-09-19 01:45:44Z | Module: Engine | Thread: 5 | New project will be created with the "MSF for Agile Software Development - v4.2" methodology 2009-09-19 01:45:44Z | Module: Engine | Retrieved IAuthorizationService proxy | Completion time: 0 seconds 2009-09-19 01:45:44Z | Module: Engine | TF30227: Project creation permissions retrieved | Completion time: 0.01 seconds 2009-09-19 01:45:45Z | Module: Engine | Wrote compressed process template file | Completion time: 0.001 seconds 2009-09-19 01:45:46Z | Module: Engine | Extracted process template file | Completion time: 1.428 seconds 2009-09-19 01:45:46Z | Module: Engine | Thread: 5 | Starting Project Creation for project "TestProject" in domain "TFSServer01" 2009-09-19 01:45:46Z | Module: Engine | The user identity information was retrieved from the Group Security Service | Completion time: 0.045 seconds 2009-09-19 01:45:46Z | Module: Initializer | Thread: 5 | The New Team Project Wizard is starting to initialize the plug-ins. 2009-09-19 01:45:46Z | Module: CssStructureUploader | Thread: 5 | Entering Initialize in CssStructureUploader 2009-09-19 01:45:46Z | Module: CssStructureUploader | Thread: 5 | Initialize for CssStructureUploader complete 2009-09-19 01:45:46Z | Module: Initializer | Thread: 5 | The New Team Project Wizard successfully Initialized the plug-in Microsoft.ProjectCreationWizard.Classification. 2009-09-19 01:45:46Z | Module: Rosetta | Thread: 5 | Entering Initialize in RosettaReportUploader 2009-09-19 01:45:48Z | Module: Rosetta | Thread: 5 | Exiting Initialize for RosettaReportUploader 2009-09-19 01:45:48Z | Module: Initializer | Thread: 5 | The New Team Project Wizard successfully Initialized the plug-in Microsoft.ProjectCreationWizard.Reporting. 2009-09-19 01:45:48Z | Module: WSS | Thread: 5 | Entering Initialize in WssSiteCreator 2009-09-19 01:45:48Z | Module: WSS | Thread: 5 | Site information: Title = "TestProject" Description = "This team project was created based on the 'MSF for Agile Software Development - v4.2' process template." 2009-09-19 01:45:48Z | Module: WSS | Thread: 5 | Base site url: http://TFSServer01:14143/webbplatser 2009-09-19 01:45:48Z | Module: WSS | Thread: 5 | Admin site url: http://TFSServer01:16183/_vti_adm/admin.asmx ---begin Exception entry--- Time: 2009-09-19 01:46:27 Z Module: Initialize Event Description: TF30207: Initialization for plugin "Microsoft.ProjectCreationWizard.Portal 'failed Exception Type: Microsoft.TeamFoundation.Client.PcwException Exception Message: The client discovered that content-type of request is text / html; charset = utf-8, but the text / xml expected. The request failed with error message: -- Unable to connect to the configuration database. --. Stack Trace: vid Microsoft.VisualStudio.TeamFoundation.WssSiteCreator.CheckPermissions(ProjectCreationContext ctxt) vid Microsoft.VisualStudio.TeamFoundation.WssSiteCreator.Initialize(ProjectCreationContext context) vid Microsoft.VisualStudio.TeamFoundation.EngineStarter.InitializePlugins(MsfTemplate template, PcwPluginCollection pluginCollection) -- Inner Exception -- Exception Type: System.InvalidOperationException Exception Message: The client discovered that content-type of request is text / html; charset = utf-8, but the text / xml expected. The request failed with error message: -- Unable to connect to the configuration database. --. Stack Trace: vid System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) vid System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) vid Microsoft.TeamFoundation.Proxy.Portal.Admin.GetLanguages() vid Microsoft.VisualStudio.TeamFoundation.WssSiteCreator.CheckPermissions(ProjectCreationContext ctxt) -- end Inner Exception -- --- end Exception entry --- Thanks for you help

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Custom types as key for a map - C++

- by Appu

I am trying to assign a custom type as a key for std::map. Here is the type which I am using as key. struct Foo { Foo(std::string s) : foo_value(s){} bool operator<(const Foo& foo1) { return foo_value < foo1.foo_value; } bool operator>(const Foo& foo1) { return foo_value > foo1.foo_value; } std::string foo_value; }; When used with std::map, I am getting the following error. error C2678: binary '<' : no operator found which takes a left-hand operand of type 'const Foo' (or there is no acceptable conversion) c:\program files\microsoft visual studio 8\vc\include\functional 143 If I change the struct like the below, everything worked. struct Foo { Foo(std::string s) : foo_value(s) {} friend bool operator<(const Foo& foo,const Foo& foo1) { return foo.foo_value < foo1.foo_value; } friend bool operator>(const Foo& foo,const Foo& foo1) { return foo.foo_value > foo1.foo_value; } std::string foo_value; }; Nothing changed except making the operator overloads as friend. I am wondering why my first code is not working? Any thoughts?

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Installing Fabric On Windows (Error No Module Called Readline)

- by Jon

I'm trying to use the Fabric 0.1.1 deploy tool (http://docs.fabfile.org/) on Windows and we're running into an issue with the readline module. I've been through various threads but can't seem to solve the issue. It's important because we can't deploy applications from Windows based machines. C:\Documents and Settings\dev\Desktop\deploy>fab Traceback (most recent call last): File "C:\python\Scripts\fab-script.py", line 8, in <module> load_entry_point('fabric==0.1.1', 'console_scripts', 'fab')() File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\pkg_resources.py" , line 277, in load_entry_point File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\pkg_resources.py" , line 2180, in load_entry_point File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\pkg_resources.py" , line 1913, in load File "build\bdist.win32\egg\fabric.py", line 25, in <module> **ImportError: No module named readline** Installing the module results in: **easy_install readline** Searching for readline Reading http://pypi.python.org/simple/readline/ Reading http://www.python.org/ Best match: readline 2.6.4 Downloading http://pypi.python.org/packages/source/r/readline/readline-2.6.4.tar .gz#md5=7568e8b78f383443ba57c9afec6f4285 Processing readline-2.6.4.tar.gz Running readline-2.6.4\setup.py -q bdist_egg --dist-dir c:\docume~1\ji81b9~1.che \locals~1\temp\easy_install-pzkz1a\readline-2.6.4\egg-dist-tmp-szs2ps Traceback (most recent call last): File "C:\python\Scripts\easy_install-script.py", line 8, in <module> load_entry_point('setuptools==0.6c9', 'console_scripts', 'easy_install')() File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 1671, in main File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 1659, in with_ei_usage File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 1675, in <lambda> File "c:\python\lib\distutils\core.py", line 152, in setup dist.run_commands() File "c:\python\lib\distutils\dist.py", line 975, in run_commands self.run_command(cmd) File "c:\python\lib\distutils\dist.py", line 995, in run_command cmd_obj.run() File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 211, in run File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 446, in easy_install File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 476, in install_item File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 655, in install_eggs File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 930, in build_and_install File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\comman d\easy_install.py", line 919, in run_setup File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\sandbo x.py", line 27, in run_setup File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\sandbo x.py", line 63, in run File "c:\python\lib\site-packages\setuptools-0.6c9-py2.6.egg\setuptools\sandbo x.py", line 29, in <lambda> File "setup.py", line 93, in <module> AttributeError: 'module' object has no attribute 'symlink' Has anybody solved this issue or can anybody suggest a workaround?

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Apache2 Enabling Includes module causes svn access to quit working

- by Matthew Talbert

I have dav_svn installed to provide http access to my svn repos. The url is directly under root, eg mywebsite.com/svn/individual-repo. This setup has been working great for some time. Now, I need SSI (server-side includes) for a project, so I enabled this module with a2enmod include. Now, tortoisesvn can't access the repo; it always returns a 301 permanent redirect. Some playing with it reveals I can access it in a browser if I'm sure to include the trailing / but it still doesn't work in TortoiseSVN. I've looked at all of the faq's for this problem with TortoiseSVN and apache, and none of them seem to apply to my problem. Anyone have any insight into this problem? I'm running Ubuntu 9.10 with Apache 2.2.12. The only change I've made to my configuration is to enable the includes mod. Here's my dav_svn conf: <Location /svn> DAV svn SVNParentPath /home/matthew/svn AuthType Basic AuthName "Subversion repository" AuthUserFile /etc/subversion/passwd Require valid-user </Location> and here's the relevant part of my virtual host conf: <Location /svn> SetHandler None Order allow,deny Allow from all </Location> Edit: OK, I've discovered that the real conflict is between the include module and basic authentication. That is, if I disable the include module, browse to the subversion repo, enter my user/pass for the basic authentication, I can browse it just fine. It even continues to work after I re-enable the include module. However, if I browse with another browser where I'm not already authenticated, then it no longer works.

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'on the web' drupal module showing images on localhost but not remote host

- by Andrew Welch

Hi, the simple little module titled 'on the web' for drupal shows social network links. It links to some images on the directory. on my localhost install they are showing but in the remote install the img tags aren't even appearing. I looked in the module's files and the path isn't hard-coded or anything so it's not to do with that. any ideas? the module is here: http://drupalmodules.com/module/on-the-web cheers andy

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"ImportError: No module named flask" - Trouble with nginx + uWSGI + Flask in a virtualenv setup

- by vjk2005

I got nginx + uWSGI running on localhost inside a virtualenv with a simple hello world program, but I get this error when I replace the hello world with a simple Flask app: File "./wsgi_configuration_module.py", line 1, in <module> from flask import Flask ImportError: No module named flask unable to load app mountpoint Here's the flask app (wsgi_configuration_module.py): from flask import Flask application = Flask(__name__) @application.route("/") def hello(): return "hello world" if __name__ == "__main__": application.run() uWSGI config (app_conf.xml): <uwsgi> <socket>127.0.0.1:9001</socket> <chdir>/srv/www/labs/application</chdir> <pythonpath>/srv/www</pythonpath> <module>wsgi_configuration_module</module> <callable>application</callable> <no-site>true</no-site> </uwsgi> nginx config: server { listen 80; server_name localhost; access_log /srv/www/labs/logs/access.log; error_log /srv/www/labs/logs/error.log; location / { include uwsgi_params; uwsgi_pass 127.0.0.1:9001; } location /static { root /srv/www/labs/public_html/static/; index index.html index.htm; } } virtualenv stored in ~/virtual_env with Python 2.7 + nginx + uWSGI + Flask installed in a virtualenv called basic. Things I've tried to solve this: set the --home (-H) option to my virtualenv folder ~/virtual_env while running uWSGI. Other info: I have the same setup working outside of a virtualenv. Things go wrong only when I try to replicate the setup inside of a virtualenv. Where have I gone wrong?

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Problem building PHP extension module

- by tixrus

I'm trying to get GD into my PHP. So I compiled it, made php.ini point to it, restarted apache etc. But no GD. So in apache error log it says PHP Warning: PHP Startup: gd: Unable to initialize module\nModule compiled with module API=20060613\nPHP compiled with module API=20090115\nThese options need to match\n in Unknown on line 0 So a bit of googling says I should not use the phpize I have before configuring and making these. I should use a new one called phpize5. I surely don't have any such thing. Unless its packed up inside something else in my php5.3. distro. Where do you get it. In Ubuntu I could just run sudo apt-get install php-dev, (apparently) and it would just appear by magic. At least that's what the webpage said. Unfortunately I am running MacOSX version Leopard. How can I build this GD module so that it will match the API number in my PHP?

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defining < operator for map of list iterators

- by Adrian

I'd like to use iterators from an STL list as keys in a map. For example: using namespace std; list<int> l; map<list<int>::const_iterator, int> t; int main(int argv, char * argc) { l.push_back(1); t[l.begin()] = 5; } However, list iterators do not have a comparison operator defined (in contrast to random access iterators), so compiling the above code results in an error: /usr/include/c++/4.2.1/bits/stl_function.h:227: error: no match for ‘operator<’ in ‘__x < __y’ If the list is changed to a vector, a map of vector const_iterators compiles fine. What is the appropriate way to define the operator < for list::const_iterator?

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Allow member to be const while still supporting operator= on the class

- by LeopardSkinPillBoxHat

I have several members in my class which are const and can therefore only be initialised via the initialiser list like so: class MyItemT { public: MyItemT(const MyPacketT& aMyPacket, const MyInfoT& aMyInfo) : mMyPacket(aMyPacket), mMyInfo(aMyInfo) { } private: const MyPacketT mMyPacket; const MyInfoT mMyInfo; }; My class can be used in some of our internally defined container classes (e.g. vectors), and these containers require that operator= is defined in the class. Of course, my operator= needs to do something like this: MyItemT& MyItemT::operator=(const MyItemT& other) { mMyPacket = other.mPacket; mMyInfo = other.mMyInfo; return *this; } which of course doesn't work because mMyPacket and mMyInfo are const members. Other than making these members non-const (which I don't want to do), any ideas about how I could fix this?

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Concatenation Operator

- by Chaitanya

This might be a silly question but it struck me, and here i ask. <?php $x="Hi"; $y=" There"; $z = $x.$y; $a = "$x$y"; echo "$z"."<br />"."$a"; ?> $z uses the traditional concatenation operator provided by php and concatenates, conversely $a doesn't, My questions: by not using the concatenation operator, does it effect the performance? If it doesn't why at all have the concatenation operator. Why have 2 modes of implementation when one does the work?

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Concatenation Operator - PHP

- by Chaitanya

This might be a silly question but it struck me, and here i ask. <?php $x="Hi"; $y=" There"; $z = $x.$y; $a = "$x$y"; echo "$z"."<br />"."$a"; ?> $z uses the traditional concatenation operator provided by php and concatenates, conversely $a doesn't, My questions: a. by not using the concatenation operator, does it effect the performance? b. If it doesn't why at all have the concatenation operator. c. Why have 2 modes of implementation when one does the work?

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Understanding pattern matching with cons operator

- by Mathias

In "Programming F#" I came across a pattern-matching like this one (I simplified a bit): let rec len list = match list with | [] -> 0 | [_] -> 1 | head :: tail -> 1 + len tail;; Practically, I understand that the last match recognizes the head and tail of the list. Conceptually, I don't get why it works. As far as I understand, :: is the cons operator, which appends a value in head position of a list, but it doesn't look to me like it is being used as an operator here. Should I understand this as a "special syntax" for lists, where :: is interpreted as an operator or a "match pattern" depending on context? Or can the same idea be extended for types other than lists, with other operators?

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Should I make OR operator to return const reference or just reference

- by Yan Cheng CHEOK

class error_code { public: error_code() : hi(0), lo(0) {} error_code(__int64 lo) : hi(0), lo(lo) {} error_code(__int64 hi, __int64 lo) : hi(hi), lo(lo) {} error_code& operator|=(const error_code &e) { this->hi |= e.hi; this->lo |= e.lo; return *this; } __int64 hi; __int64 lo; }; error_code operator|(const error_code& e0, const error_code& e1) { return error_code(e0.hi | e1.hi, e0.lo | e1.lo); } int main() { error_code e0(1); error_code e1(2); e0 |= e1; } I was wondering, whether I should make operator|= to return a const error_code& or error_code& ?

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Diagnosing "The specified module could not be found" on IIS7 with ASP.Net

- by Baldy

I am migrating some web apps from a windows 2003 server with IIS6 server to a Windows server 2008 R2 server with IIS7. One of the apps, which runs on asp.net v2.0 using forms authentication will not load. It gives me the following error... The specified module could not be found. (Exception from HRESULT: 0x8007007E) Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IO.FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E) Now i fully understand that the app cannot load some kind of resource due to a FileNotFoundException, but i am struggling to diagnose exactly where in the application this is happening, as it does not tell me what the module is, nor what file it is looking for. I have enabled failed request tracing and i get back a complete request trace, yet i cannot find anything that gives me detail on this specific error, or the module involved. Any advice on diagnosing the root cause of the issue would be greatly appreciated.

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maven multi web module

- by Maheshkumar

I have multi module web application(m1,m2, m3, final). Module "final" is a web module and dependants on m1,m2 and m3. "m1,m2 and m3" are web modules. I need modules m1,m2, m3 resources and jsps should be copied "final" module's target dir. Need your help.

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Ruby (and Rails) nested module syntax

- by brad

I'm wondering what the difference is between the following two modules # First Example module Parent module Child end end and # Second Example module Parent::Child end Using the 2nd method, it appears as though the Parent module must be previously defined, otherwise I get an 'uninitialized constant' error Given this, what is the preferred way of defining modules such as this and then adding nested children with regards to syntax and file structure (ie. folders etc). Reference to a Rails way would be greatly appreciated. Are these two examples for all intents and purposes equivalent?

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JSDoc3: How to document a AMD module that returns a function

- by Jens Simon

I'm trying to find a way to document AMD modules using JSDoc3. /** * Module description. * * @module path/to/module */ define(['jquery', 'underscore'], function (jQuery, _) { /** * @param {string} foo Foo-Description * @param {object} bar Bar-Description */ return function (foo, bar) { // insert code here }; }); Sadly none of the patterns listed on http://usejsdoc.org/howto-commonjs-modules.html work for me. How can I generate a proper documentation that lists the parameters and return value of the function exported by the module?

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Does dynamic_cast work inside overloaded operator delete ?

- by iammilind

I came across this: struct Base { void* operator new (size_t); void operator delete (void*); virtual ~Base () {} // <--- polymorphic }; struct Derived : Base {}; void Base::operator delete (void *p) { Base *pB = static_cast<Base*>(p); if(dynamic_cast<Derived*>(pB) != 0) { /* ... NOT reaching here ? ... */ } free(p); } Now if we do, Base *p = new Derived; delete p; Surprisingly, the condition inside the Base::delete is not satisfied Am I doing anything wrong ? Or casting from void* looses the information of Derived* ?

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