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• Stringified template argument

  - by pythonic metaphor

  Is it possible to get a stringified version of a template argument name? Something like this, if only we were running the preprocessor: template <typename T> struct Named{ const char* name(){ return "Named<" #T ">"; } };

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• C++: how to declare template array as function parameter

  - by ~buratinas

  Very similar to this post How can I declare template array as a parameter in templated function? Something like this code: template <unsigned i> void my_func (char (&a)[i]); //yes, I do need that reference

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• c++ template and its element type

  - by David

  This is my template matrix class: template<typename T> class Matrix { public: .... Matrix<T> operator / (const T &num); } However, in my Pixel class, I didn't define the Pixel/Pixel operator at all! Why in this case, the compiler still compiles?

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• Conversion between different template instantiation of the same template

  - by Naveen

  I am trying to write an operator which converts between the differnt types of the same implementation. This is the sample code: template <class T = int> class A { public: A() : m_a(0){} template <class U> operator A<U>() { A<U> u; u.m_a = m_a; return u; } private: int m_a; }; int main(void) { A<int> a; A<double> b = a; return 0; } However, it gives the following error for line u.m_a = m_a;. Error 2 error C2248: 'A::m_a' : cannot access private member declared in class 'A' d:\VC++\Vs8Console\Vs8Console\Vs8Console.cpp 30 Vs8Console I understand the error is because A<U> is a totally different type from A<T>. Is there any simple way of solving this (may be using a friend?) other than providing setter and getter methods? I am using Visual studio 2008 if it matters.

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• Apache/Django subdomains problem

  - by thomasgg

  Now I have apache configuration which works only with localhost domain (http://localhost/). Alias /media/ "/sciezka/do/instalacji/django/contrib/admin/media/" Alias /site_media/ "/sciezka/do/plikow/site_media/" <Location "/"> SetHandler python-program PythonHandler django.core.handlers.modpython SetEnv DJANGO_SETTINGS_MODULE settings PythonPath "['/thomas/django_projects/project'] + sys.path" PythonDebug On </Location> <Location "/site_media"> SetHandler none </Location> How can I make it working for some subdomains like pl.localhost or uk.localhost? This subdomains should display the same page what domain (localhost). Second question: It is possible change default localhost address (http://localhost/) to (http://localhost.com/) or (http://www.localhost.com/) or something else?

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• Django Dying on Shared Hosting Environment (Too Many MySQL Connections)

  - by Tom

  I've had a Django site up and running on HostGator (client requirement), following these instructions, for a few weeks now. I had seen two error emails about pages dying with (1040: Too many MySQL connections) but had never been able to recreate the problem. As of today, the site is completely unresponsive and all pages, even the static files, are dying with that error. Two questions: What can I do to fix this (other than caching more stuff)? Why would static files be dying like that? I can request them directly without a problem, so how are they getting run through Django? The shared hosting setup doesn't allow for a <Location> block, but there's a flag in the rewrite rule that says only requests for files that don't exist in the filesystem should be processed. All of my static files exist on the system, though they are symbolically linked files if it matters.

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• Running django custom management commands with supervisord

  - by mfsaint

  I'd like to use supervisord to run some commands for my Django project but I keep getting the following error: supervisor.log: 2012-05-18 17:52:15,784 INFO spawnerr: can't find command 'source' If I remove the "source" command, the log shows the same error: can't find command 'python'. supervisord.conf excerpt: [program:django] directory=/home/mf/projects/djangopj/ command=beanstalkd -l 127.0.0.1 -p 11300 command=source /home/mf/virtualenvs/env/bin/activate command=python manage.py command1 command=python manage.py command2 user=mf autostart=true autorestart=true I tried removing the directory and adding the absolute path to the commands but I kept getting the same error. I run supervisord with the following command: supervisord -c supervisord.conf -l supervisor.log

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• Apache, Django with mod_wsgi, and large request buffering

  - by Mukul

  In my setup of Apache 2.2 MPM worker and Django 1.3 with mod_wsgi 2.8, I need to support large POST request payloads. The problem is that when there are many such simultaneous requests, Apache uses up all the memory in the system and then crashes. It seems that Apache is buffering the requests completely in memory before executing the WSGI handler and passing it the request. Is there any way to control request buffering in Apache? The log shows the following error whenever the crash happens: [Wed Jun 29 18:35:27 2011] [error] cgid daemon process died, restarting Here's my virtual host's configuration: <VirtualHost *:8080> ServerName example.com ErrorLog /var/log/apache2/error.log WSGIScriptAlias / <path to django.wsgi> WSGIPassAuthorization on WSGIDaemonProcess example.com WSGIProcessGroup example.com XSendFileAllowAbove on XSendFile on </VirtualHost>

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• Nginx / uWsgi / Django site can handle more traffic with rewrite URL

  - by Ludo

  Hi there. I'm running a Django app, using uWsgi behind Nginx. I've been doing some performance tuning and load testing using ApacheBench and have discovered something unexpected which I wonder if someone could explain for me. In my Nginx config I have a rewrite directive which catches lots of different URL permutations and then forwards them to the canonical URL I wish to use, eg, it traps www.mysite.com/whatever, www.mysite.co.uk/whatever and forwards them all to http://mysite.com/whatever. If I load test against any of the URLs listed with a redirect (ie, NOT the canonical URL which it is eventually forwarded to), it can serve 15000 concurrent connections without breaking a sweat. If I load test against the canonical URL, which the above test I would have expected got forwarded to anyway, it can't handle nearly as much. It will drop about 4000 of the 15000 requests, and can only handle about 9000 reliably. This is the command line I'm using to test: ab -c15000 -n15000 http://www.mysite.com/somepath/ and ab -c15000 -n15000 http://mysite.com/somepath/ I've tried several different types - it makes no different which order I do them in. This doesn't make sense to me - I can understand why the requests involving a redirect may not handle quite so many concurrent connections, but it's happening the other way round. Can anyone explain? I'd really prefer it if the canonical URL was the one which could handle more traffic. I'll post my Nginx config below. Thanks loads for any help! server { server_name www.somesite.com somesite.net www.somesite.net somesite.co.uk www.somesite.co.uk; rewrite ^(.*) http://somesite.com$1 permanent; } server { root /home/django/domains/somesite.com/live/somesite/; server_name somesite.com somesite-live.myserver.somesite.com; access_log /home/django/domains/somesite.com/live/log/nginx.log; location / { uwsgi_pass unix:////tmp/somesite-live.sock; include uwsgi_params; } location /media { try_files $uri $uri/ /index.html; } location /site_media { try_files $uri $uri/ /index.html; } location = /favicon.ico { empty_gif; } }

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• Web Server for SVN+PHP+Django+Rails

  - by NetStudent

  Foreword: I am not asking for the differences between Nginx and Apache, nor do I want to start a "which one is better discussion. I would like to ask for help with choosing the most adequate solution for this particular situation. I need to setup one or more l SVN repositories accessible via HTTP, plus some PHP, Django and Ruby websites. However, and since I only have 512Mb of RAM at my disposal, I fear that Apache will be a too heavy choice... On the other hand, I have heard that Nginx does not fully support SVN (WebDAV) and Django without reverse proxying to Apache. Is this still true? Should I go for Apache/Nginx alone? Or should I set up both and have Nginx handling static content and proxying to Apacge for dynamic content?

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• Django freezes when adding objects through the admin

  - by Quartz

  I have a Django 1.1 website running via Apache/mod_wsgi with a PostgreSQL 8.3.1 database. Recently, when I added objects through the admin interface, the connection froze up and I lost several worker processes, so I had to restart Apache. Upon trying to replicate this, I found that it only happens through the admin: if I go into the Django shell and issue the same insert, it works fine. Also, performing an UPDATE operation works without issues, so just INSERTs. I've rebuilt indexes on PostgreSQL and run a full VACUUM. Error logs don't show anything, and I can't figure out for the life of me what's wrong. Anyone have any ideas?

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• NGinX config for Django and Wordpress in subdirectory

  - by Helmut

  I need to set up a Django site at the root of a domain, but then have a Wordpress installation in a subdirectly (e.g. /blog/). How would one configure NGinX to do this? "Pretty" URLs have to work for Wordpress as well. For Django I am using Gunicorn, which is already configured. From NGinX I would call "proxy_pass" to direct to that. PHP is run via FPM. Considering the restrictions above, how would I configure NGinX? Any help would be appreciated! Thanks.

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• SEO URL structure for tag search on site

  - by Theo G

  I am looking to add tags to each product on my site e.g. brown, x products under £x, second hand x, refurbished x etc. Once you click these tags it will then search for other tags that are similar. I was thinking of using a url structure of www.site.com/tags/this%is%the%tag%name and then simply have a page that shows the results of all the products with that tag. I heard a while back that google generally ignores or downgrades anything with ‘search’ in the url and was wondering if anyone had any experience with this? Also, would you say /tags/ is a pretty valid destination or is it best to break it down and add more levels e.g. /product-type/product%variation Thanks in advance!

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• Why is my django bulk database population so slow and frequently failing?

  - by bryn

  I decided I'd like to use django's model system rather than coding raw SQL to interface with my database, but I am having a problem that surely is avoidable. My models.py contains: class Student(models.Model): student_id = models.IntegerField(unique = True) form = models.CharField(max_length = 10) preferred = models.CharField(max_length = 70) surname = models.CharField(max_length = 70) and I'm populating it by looping through a list as follows: from models import Student for id, frm, pref, sname in large_list_of_data: s = Student(student_id = id, form = frm, preferred = pref, surname = sname) s.save() I don't really want to be saving this to the database each time but I don't know another way to get django to not forget about it (I'd rather add all the rows and then do a single commit). There are two problems with the code as it stands. It's slow -- about 20 students get updated each second. It doesn't even make it through large_list_of_data, instead throwing a DatabaseError saying "unable to open database file". (Possibly because I'm using sqlite3.) My question is: How can I stop these two things from happening? I'm guessing that the root of both problems is that I've got the s.save() but I don't see a way of easily batching the students up and then saving them in one commit to the database.

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• nVelocity - Template issue when attempting 'greater than' comparison on decimal property

  - by Bart

  I have a simple object that has as one of it's properties a decimal named Amount. When I attempt a comparison on this property as part of an nVelocity template, the comparison always fails. If I change the property to be of type int the comparison works fine. Is there anything extra I need to add to the template for the comparison to work? Below is a sample from the aforementioned template: #foreach( $bet in $bets ) <li> $bet.Date $bet.Race #if($bet.Amount > 10) <strong>$bet.Amount.ToString("c")</strong> #else $bet.Amount.ToString("c") #end </li> #end Below is the Bet class: public class Bet { public Bet(decimal amount, string race, DateTime date) { Amount = amount; Race = race; Date = date; } public decimal Amount { get; set; } public string Race { get; set; } public DateTime Date { get; set; } } Any help would be greatly appreciated.

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• Reference a Map by name within Velocity Template

  - by Wiretap

  Pretty sure there is an easy answer to this, but just can't find the right VTL syntax. In my context I'm passing a Map which contains other Maps. I'd like to reference these inner maps by name and assign them within my template. The inner maps are constructed by different parts of the app, and then added to the context by way of example public static void main( String[] args ) throws Exception { VelocityEngine ve = new VelocityEngine(); ve.init(); Template t = ve.getTemplate( "test.vm" ); VelocityContext context = new VelocityContext(); Map<String,Map<String,String>> messageData = new HashMap<String, Map<String,String>>(); Map<String,String> data_map = new HashMap<String,String>(); data_map.put("data_1","1234"); data_map.put("a_date", "31-Dec-2009"); messageData.put("inner_map", data_map); context.put("msgData", messageData); StringWriter writer = new StringWriter(); t.merge( context, writer ); System.out.println( writer.toString() ); } Template - test.vm #set ($in_map = $msgData.get($inner_map) ) data: $in_map.data_1 $in_map.a_date

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• Python template engine

  - by jturo

  Hello there, Could it be possible if somebody could help me get started in writing a python template engine? I'm new to python and as I learn the language I've managed to write a little MVC framework running in its own light-weight-WSGI-like server. I've managed to write a script that finds and replaces keys for values: (Obviously this is not how my script is structured or implemented. this is just an example) from string import Template html = '<html>\n' html += ' <head>\n' html += ' <title>This is so Cool : In Controller HTML</title>\n' html += ' </head>\n' html += ' <body>\n' html += ' Home | <a href="/hi">Hi ${name}</a>\n' html += ' </body>\n' html += '<html>' Template(html).safe_substitute(dict(name = 'Arturo')) My next goal is to implement custom statements, modifiers, functions, etc (like 'for' loop) but i don't really know if i should use another module that i don't know about. I thought of regular expressions but i kind feel like that wouldn't be an efficient way of doing it Any help is appreciated, and i'm sure this will be of use to other people too. Thank you

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• C++ member template for boost ptr_vector

  - by Ivan

  Hi there, I'm trying to write a container class using boost::ptr_vector. Inside the ptr_vector I would like to include different classes. I'm trying to achieve that using static templates, but so far I'm not able to do that. For example, the container class is class model { private: boost::ptr_vector<elem_type> elements; public: void insert_element(elem_type *a) { element_list.push_back(a); } }; and what I'm trying to achieve is be able to use different elem_type classes. The code below doesn't satisfy my requirements: template <typename T>class model { private: boost::ptr_vector<T> elements; public: void insert_element(T *a) { element_list.push_back(a); } }; because when I initialize the container class I can only use one class as template: model <elem_type_1> model_thing; model_thing.insert_element(new elem_type_1) but not elem_type_2: model_thing.insert_element(new elem_type_2)//error, of course It is possible to do something like using templates only on the member? class model { private: template <typename T> boost::ptr_vector<T> elements; public: void insert_element(T *a) { element_list.push_back(a); } }; //wrong So I can call the insert_element on the specific class that I want to insert? Note that I do not want to use virtual members. Thanks!

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• C++ template and pointers

  - by Kary

  I have a problem with a template and pointers ( I think ). Below is the part of my code: /* ItemCollection.h */ #ifndef ITEMCOLLECTION_H #define ITEMCOLLECTION_H #include <cstddef> using namespace std; template <class T> class ItemCollection { public: // constructor //destructor void insertItem( const T ); private: struct Item { T price; Item* left; Item* right; }; Item* root; Item* insert( T, Item* ); }; #endif And the file with function defintion: /* ItemCollectionTemp.h-member functions defintion */ #include <iostream> #include <cstddef> #include "ItemCollection.h" template <class Type> Item* ItemCollection <T>::insert( T p, Item* ptr) { // function body } Here are the errors which are generated by this line of code: Item* ItemCollection <T>::insert( T p, Item* ptr) Errors: error C2143: syntax error : missing ';' before '*' error C4430: missing type specifier - int assumed. Note: C++ does not support default-int error C2065: 'Type' : undeclared identifier error C2065: 'Type' : undeclared identifier error C2146: syntax error : missing ')' before identifier 'p' error C4430: missing type specifier - int assumed. Note: C++ does not support default-int error C2470: 'ItemCollection::insert' : looks like a function definition, but there is no parameter list; skipping apparent body error C2072: 'ItemCollection::insert': initialization of a function error C2059: syntax error : ')' Any help is much appreciated.

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• how to prevent jsp tags from being reused after being classloaded

  - by mkoryak

  I have a problem where certain attributes in tag files stick around for the next time the tag is used. I think this is because the Tag class is being classloaded, and then that same instance is reused for every invocation. So attributes that i do not set in later invocations are not null like i would expect them to be, and contain stale values! I want this to not happen any more. Does anyone know what setting controls that in tomcat 6?

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• Add Comment Tags to Disqus Comments

  - by Mark P Neyer

  I have a blog, and I'm using Disqus for comments. I want to give users the ability to tag comments, but I can't figure out where in the code this would go. Any help would be appreciated.

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• C# & Adding Dynamic META Tags

  - by Bry4n

  I have this code protected void Page_Load(object sender, EventArgs e) { DataSet.DestinationsDataTable GetDestinations = (DataSet.DestinationsDataTable)dta.GetData(); Page.Title = GetDestinations.Rows[0]["Meta_Title"].ToString(); HtmlMeta hm = new HtmlMeta(); HtmlHead head = (HtmlHead)Page.Header; hm.Name = GetDestinations.Rows[0]["Meta_Desc"].ToString(); hm.Content = GetDestinations.Rows[0]["Meta_Key"].ToString(); head.Controls.Add(hm); } And it's returning this error (on a content page) The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). Thoughts?

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• Accessing Spring beans from servlet filters and tags

  - by Damo

  I can access Spring beans in my Servlets using WebApplicationContext springContext = WebApplicationContextUtils.getWebApplicationContext(getServletContext()); in the Servlet's init method. I was wondering is there an equivalent of the WebApplicationContext for servlet filters? Also, is it possible to access Spring beans in a tag class?

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• Tags usage in Struts 2

  - by Panther24

  Hi, I have the following code snippet <s:iterator status="stat" value="masterAccountList"> <tr> <td><s:property value="name"/></td> <td><s:property value="status"/></td> <s:set name="DrStat" id="DrStat" value="<s:property value='status'/>"/> <td><s:if test='DrStat.contains("Out")'> Dr. Is Available </s:if> <s:else> Dr. Is not Available </s:else> </td> </tr> </s:iterator> I need to check the status if it contains a keyword and display text accordingly. When I try this, I always get 'Not Available' status. I'm not even sure what the set returns, how can I see that?

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• Java libarary for HTML elements/tags

  - by corgrath

  Anyone know a decent Java libarary for HTML elements? Ex if I want to create an img-element, I would go new Image(...) The object should support the normal HTML functions/attributes, such as setting CSS or disable.

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