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• lua - how to call function from above it in code (prior to it being defined)?

  - by Greg

  what is the syntax (i.e. code example) in Lua so you can call a function prior to it being defined? i.e. how do you kind of create the function, but then add it's implementation further down in code. So roughly like this: define function name (doX) here somehow (i.e. subject of this question) call doX here (further down in the code) doX implemention here (i.e. all functions down at the bottom of the file)

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• Blu-ray player?

  - by Dox

  I'd like to play bluray discs in my laptop. I found the official documentation, and there it's explained that one should use mplayer and ffmpeg. Looking at the repositories, there exist two different mplayer packages (in conflict with each other) mplayer mplayer2 Any ideas with of them should I install? On the other hand the official documentation seems to be out of date since no mention to Ubuntu after 9.04 is done. Does the DumpHD package from the repositories work? Finally, Where could the keydb.cfg keys be found? I'm open to suggestions, specially of people who had done the job of making it work. Cheers

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• Cannot overload function

  - by anio

  So I've got a templatized class and I want to overload the behavior of a function when I have specific type, say char. For all other types, let them do their own thing. However, c++ won't let me overload the function. Why can't I overload this function? I really really do not want to do template specialization, because then I've got duplicate the entire class. Here is a toy example demonstrating the problem: http://codepad.org/eTgLG932 The same code posted here for your reading pleasure: #include <iostream> #include <cstdlib> #include <string> struct Bar { std::string blah() { return "blah"; } }; template <typename T> struct Foo { public: std::string doX() { return m_getY(my_t); } private: std::string m_getY(char* p_msg) { return std::string(p_msg); } std::string m_getY(T* p_msg) { return p_msg->blah(); } T my_t; }; int main(int, char**) { Foo<char> x; Foo<Bar> y; std::cout << "x " << x.doX() << std::endl; return EXIT_SUCCESS; } Thank you everyone for your suggestions. Two valid solutions have been presented. I can either specialize the doX method, or specialize m_getY() method. At the end of the day I prefer to keep my specializations private rather than public so I'm accepting Krill's answer.

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• How does an interpreter switch scope?

  - by Dox

  I'm asking this because I'm relatively new to interpreter development and I wanted to know some basic concepts before reinventing the wheel. I thought of the values of all variables stored in an array which makes the current scope, upon entering a function the array is swapped and the original array put on some sort of stack. When leaving the function the top element of the "scope stack" is popped of and used again. Is this basically right? Isn't swapping arrays (which means moving around a lot of data) not very slow and therefore not used by modern interpreters?

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• How to use Unicode in C++?

  - by Dox

  Assuming a very simple program that: -ask a name. -store the name in a variable. -display the variable content on the screen. It's so simple that is the first thing that one learns. But my problem is that I don't know how to do the same thing if I enter the name using japanese characters. So, if you know how to do this in C++, please show me an example (that I can compile and test) Thanks.

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• ActionScript 3 class over several files - how?

  - by Poni

  So, how do we write a class over several files in action script 3? In C# there's the "partial" keyword. In C++ it's natural (you just "#include ..." all files). In Flex 3, in a component, you add this tag: <mx:Script source="myfile.as"/>. How do I split the following class into several files; package package_path { public class cSplitMeClass { public function cSplitMeClass() { } public function doX():void { // .... } public function doY():void { // .... } } } For example I want to have the doX() and doY() functions implemented in another ".as" file. Can I do this? And please, don't tell me something like "a good practice is to have them in one file" :)

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• Ruby: what the hell does this code saying ????

  - by wefwgeweg

  i discovered this in a dark place one day...what the hell is it supposed to do ?? def spliceElement(newelement,dickwad) dox = Nokogiri::HTML(newelement) fuck = dox.xpath("//text()").to_a fuck.each do |shit| if shit.text.include? ": " dickwad << shit.text.split(': ')[1].strip + "|" else if shit.text =~ /\s{1,}/ or shit.text =~ /\n{1,}/ puts "fuck" else dickwad << shit.text.squeeze(" ").strip + "|" end end end dickwad << "\n" end def extract(newdoc, newarray) doc = Nokogiri::HTML(newdoc) collection = Array.new newarray.each do |dong| newb = doc.xpath(dong).to_a #puts doc.xpath(dong).text collection << newb end dickwad = ""; if collection.length > 1 (0...collection.first.length).each do |i| (0...collection.length).each do |j| somefield = collection[j][i].to_s.gsub(/\s{2,}/,' ') spliceElement(somefield, dickwad) end newrow = dickwad.chop + "\n" return newrow.to_s end else collection.first.each do |shit| somefield = shit.to_s.gsub(/\s{2,}/,' ') spliceElement(somefield, dickwad) puts somefield + "\n\n" #newrow = dickwad.chop + "\n" #puts newrow #return newrow.to_s sleep 1 end end

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• Subdocument in Word won't save

  - by ChrisW

  Because I know Word has a history of not liking very large documents (my supervisor specifically told me not to use LaTeX... grr), I decided to learn the Master document / subdocument feature of Word when writing my PhD thesis. I have the title page / table of contents etc in the master document, and each chapter as a separate document. However, when I save the master document, it appears to save all the chapter documents apart from one (Chapter 4), for which it brings up the Save Document dialog box, helpfully with "Chapter4.docx" in the "Save as" box (n.b. Chpater4.dox is not open). Clicking save does nothing, and doesn't make the dialog box go away. Saving as a different document means that my changes aren't reflected in the same document. There must be some reason Word doesn't like this particular document but I've got no idea why - there's nothing special in it that isn't in any of the other chapters. I have tried closing all documents, renaming Chapter4.docx, opening the master document, expanding all documents, OKing the warning that Chapter4.dox does not exist, and inserting the 'new' document, but even when I save the master document it still won't save the new Chapter4 document. If anyone knows any reason why Word is acting like this (or if I'm doing anything stupid), I'll be eternally grateful (p.s. sorry for the long rambling message. It's late; I've been working on my PhD 4.5 years, I really really want to throw this computer out the window, and I hope people are kind enough not to downvote this question because of it's rambling nature!) Update With Word closed, I've tried to delete Chapter4.docx (having made a backup!) - but I get a warning that it can't be deleted because it's open in Microsoft Word... these files are on a network drive and the same problems are happening on 2 different computers. I could login to the filestore through ssh and force the file to be deleted, but I'm curious to know why this is happening!

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• function names - "standartised" prefixes

  - by dnsmkl

  Imagine you have such routines /*just do X. Fail if any precondition is not met*/ doX() /*take care of preconditions and then do X*/ takeCareOfPreconditionsCheckIfNeededAtAllAndThenDoX() A little bit more concrete example: /*create directory. Most probably fail with error if any precondition is not met (folder already exists, parent does not exists)*/ createDirectory(path_name) /*take care of preconditions (creates full path till folder if needed, checks if not exists yet) and then creates the directory*/ CheckIfNotExistsYet_CreateDirectory_andFullPathIfNeeded(path_name) How do you name such routines, so it would be clear what does what? I have come to some my own "convetion" like: naiveCreateDirectory, ForceDirectoryExists, ... But I imagine this is very standard situation. Maybe there already exists some norms/convetions for this?

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• Function names - "standardized" prefixes

  - by dnsmkl

  Imagine you have such routines /*just do X. Fail if any precondition is not met*/ doX() /*take care of preconditions and then do X*/ takeCareOfPreconditionsCheckIfNeededAtAllAndThenDoX() A little bit more concrete example: /*create directory. Most probably fail with error if any precondition is not met (folder already exists, parent does not exists)*/ createDirectory(path_name) /*take care of preconditions (creates full path till folder if needed, checks if not exists yet) and then creates the directory*/ CheckIfNotExistsYet_CreateDirectory_andFullPathIfNeeded(path_name) How do you name such routines, so it would be clear what does what? I have come to some my own "convetion" like: naiveCreateDirectory, ForceDirectoryExists, ... But I imagine this is very standard situation. Maybe there already exists some norms/convetions for this?

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• Wrong package for Idle-python2.7?

  - by adelval

  I'm running python 2.7 in Ubuntu 3.10, and idle (idle-python2.7) has stopped working. Whenever I try to open a file in a editor window, it is blank, though the file does exist and is not empty/blank. Furthermore, it is not possible to close idle after this, except via a terminal kill command. Idle was working fine before. The problem appeared after I installed a number of things, including idlex, various scipy modules and mpmath, but after trying to repair it in several ways, it seems to be caused by Ubuntu's official idle package. I get this error in the terminal when trying to open a file in idle: Exception in Tkinter callback [...lines ommitted for brevity...] File "/usr/lib/python2.7/idlelib/IOBinding.py", line 129, in coding_spec for line in lst: NameError: global name 'lst' is not defined If you look at the code, it looks like an obvious bug: indeed lst is not defined in the function coding_spec. Furthermore, the source file IOBinding.py in http://fossies.org/dox/Python-2.7.5/IOBinding_8py_source.html is different and doesn't show the problem. Thinking that one of the recently packages had overwritten the file somehow, I've tried a number of things, including reinstalling all Python packages from synaptic, but the wrong IOBinding.py is still there. The reason I think the problem lies with the package itself is that I finally did sudo apt-get remove idle, verified that the idlelib directory was empty, and reinstalled with sudo apt-get install idle; but the wrong IOBinding.py file came back again. I can in fact make idle work again by simply replacing lst by str in the code, but to me that's clearly a no-no. I'm not to happy either about trying to replace just that file from the source python distribution, as other files may be wrong. I want to get the right files from the official package.

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• Refactor java code

  - by Alfred

  I would like to refactor code which looks something like this: String input; // input from client socket. if (input.equals(x) { doX(); } else if (input.equals(y) { doY(); } else { unknown_command(); } It is code which checks input from socket to perform some action, but I don't like the if else construction because every time a new command is added to the server (code) a new if else has to be added which is ugly. Also when deleting a command the if else has to be modified.

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• How do I know if I'm iterating on the last item of the collection?

  - by Camilo Martin

  I want to do something different on the last KeyValuePair of the Dictionary I'm iterating on. For Each item In collection If ItsTheLastItem DoX() Else DoY() End If Next Is this possible? Edit: As Jon correctly remarks, Dictionaries are not the kind of thing that's sorted, so I should mention that I only want to do this when displaying results to the user, and it doesn't matter if later on the last item is different. In another note, I'll use my own answer but I'll accept the most upvoted one after I check back in some hours.

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• nginx proxy_pass POST 404 errors

  - by Scott

  I have nginx proxying to an app server, with the following configuration: location /app/ { # send to app server without the /app qualifier rewrite /app/(.*)$ /$1 break; proxy_set_header Host $http_host; proxy_pass http://localhost:9001; proxy_redirect http://localhost:9001 http://localhost:9000; } Any request for /app goes to :9001, whereas the default site is hosted on :9000. GET requests work fine. But whenever I submit a POST request to /app/any/post/url it results in a 404 error. Hitting the url directly in the browser via GET /app/any/post/url hits the app server as expected. I found online other people with similar problems and added proxy_set_header Host $http_host; but this hasn't resolved my issue. Any insights are appreciated. Thanks. Full config below: server { listen 9000; ## listen for ipv4; this line is default and implied #listen [::]:80 default_server ipv6only=on; ## listen for ipv6 root /home/scott/src/ph-dox/html; # root ../html; TODO: how to do relative paths? index index.html index.htm; # Make site accessible from http://localhost/ server_name localhost; location / { # First attempt to serve request as file, then # as directory, then fall back to displaying a 404. try_files $uri $uri/ /index.html; # Uncomment to enable naxsi on this location # include /etc/nginx/naxsi.rules } location /app/ { # rewrite here sends to app server without the /app qualifier rewrite /app/(.*)$ /$1 break; proxy_set_header Host $http_host; proxy_pass http://localhost:9001; proxy_redirect http://localhost:9001 http://localhost:9000; } location /doc/ { alias /usr/share/doc/; autoindex on; allow 127.0.0.1; allow ::1; deny all; } }

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• Bash completion doesn't work, or is ignoring what I've typed; but works for commands

  - by Neil Traft

  Bash completion seems to be ignoring what I've typed (it tries to complete, but acts as if there's nothing under the cursor). I know I saw it work on this machine earlier today, but I'm not sure what has changed. Some examples: cd shows all directories under my current folder: $ cd co<tab><tab> cmake/ config/ doc/ examples/ include/ programs/ sandbox/ src/ .svn/ tests/ Commands like ls and less show all files and directories under my current folder: $ ls co<tab><tab> cmake/ config/ .cproject Doxyfile.in include/ programs/ README.txt src/ tests/ CMakeLists.txt COPYING.txt doc/ examples/ mainpage.dox .project sandbox/ .svn/ Even when I try to complete things from a different folder, it gives me only the results for my current folder (telling me that it is completely ignoring what I've typed): $ cd ~/D<tab><tab> cmake/ config/ doc/ examples/ include/ programs/ sandbox/ src/ .svn/ tests/ But it seems to be working fine for commands and variables: $ if<tab><tab> if ifconfig ifdown ifnames ifquery ifup $ echo $P<tab><tab> $PATH $PIPESTATUS $PPID $PS1 $PS2 $PS4 $PWD $PYTHONPATH I do have this bit in my .bashrc, and I have confirmed that my .bashrc is indeed getting sourced: if [ -f /etc/bash_completion ] && ! shopt -oq posix; then . /etc/bash_completion fi I've even tried manually executing that file, but it doesn't fix the problem: $ . /etc/bash_completion There was even one point in time where it was working for ls, but was not working for cd ... but I can't replicate that result now. Update: I also just discovered that I have terminals open from earlier that still work. I ran source .bashrc in one of them and afterwards completion was broken. Here is my .bashrc: # ~/.bashrc: executed by bash(1) for non-login shells. # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc) # for examples # # Modified by Neil Traft #source ~/.profile # Allow globs to expand hidden files shopt -s dotglob nullglob # If not running interactively, don't do anything [ -z "$PS1" ] && return # don't put duplicate lines or lines starting with space in the history. # See bash(1) for more options HISTCONTROL=ignoreboth # append to the history file, don't overwrite it shopt -s histappend # for setting history length see HISTSIZE and HISTFILESIZE in bash(1) HISTSIZE=1000 HISTFILESIZE=2000 # check the window size after each command and, if necessary, # update the values of LINES and COLUMNS. shopt -s checkwinsize # If set, the pattern "**" used in a pathname expansion context will # match all files and zero or more directories and subdirectories. #shopt -s globstar # make less more friendly for non-text input files, see lesspipe(1) [ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)" # set variable identifying the chroot you work in (used in the prompt below) if [ -z "$debian_chroot" ] && [ -r /etc/debian_chroot ]; then debian_chroot=$(cat /etc/debian_chroot) fi # Color the prompt export PS1="\[$(tput setaf 2)\]\u@\h:\[$(tput setaf 5)\]\W\[$(tput setaf 2)\] $\[$(tput sgr0)\] " # enable color support of ls and also add handy aliases if [ -x /usr/bin/dircolors ]; then test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)" alias ls='ls --color=auto' #alias dir='dir --color=auto' #alias vdir='vdir --color=auto' alias grep='grep --color=auto' alias fgrep='fgrep --color=auto' alias egrep='egrep --color=auto' fi # Add an "alert" alias for long running commands. Use like so: # sleep 10; alert alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"' # Alias definitions. # You may want to put all your additions into a separate file like # ~/.bash_aliases, instead of adding them here directly. # See /usr/share/doc/bash-doc/examples in the bash-doc package. if [ -f ~/.bash_aliases ]; then . ~/.bash_aliases fi # enable programmable completion features (you don't need to enable # this, if it's already enabled in /etc/bash.bashrc and /etc/profile # sources /etc/bash.bashrc). if [ -f /etc/bash_completion ] && ! shopt -oq posix; then . /etc/bash_completion fi

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• Firebug not breaking on errors

  - by stormdrain

  Hi. I reinstalled Firefox today, because... whatever. I reinstalled firebug, therefully, and now when I try to use it, it's all different. I believe it is the same version I had before. In fact, I even went digging through my trash and replaced the new firebug with the one I removed with the old Firefox. They ended up being the same version (1.5.3). My issue is, when I have an error in my script somewhere, it used to be that if on the script pane of firebug, the script would break on the error, and the script page would go to the offending line, highlighted, and all was right with the world. Now, it logs the error in the console, and that's it. I've spent the better part of the last hour trying to convince myself this isn't worth an ulcer; I am losing the battle, though. I've searched Google, put ads on Craigslist, even thought about becoming a cop. There were some examples on the Firebug dox, but none of them helped. A bunch of old references to a mysterious (break on all errors) option; an option which I think I might have set by accident--there is a little red circle-slash on my pause button (that's what she said), but there the script continues, all on its own. There was a guide somewhere on the firebug pages that spoke of setting the breakpoint next to the error in the console. I, however, don't have this option for some reason. The line of code is there in the console, but no breakpoint button next to it. This, however, would not be ideal even if it worked. I liked it when I could have the script page open, and if there were errors it would jump to that line. I could try to fix it, and re-load the page. If that line was fixed, GREAT, on to the next error on the page -- which would be highlighted and ready. I would like to offer a solicitation of help. Help.

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