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• List of functions references

  - by Ockonal

  Hello, I'm using boost::function for making references to the functions. Can I make a list of references? For example: boost::function<bool (Entity &handle)> behaviorRef; And I need in a list of such pointers. For example: std::vector<behaviorRef> listPointers; Of course it's wrong code due to behaviorRef isn't a type. So the question is: how can I store a list of pointers for the function?

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• LLVM Clang 5.0 explicit in copy-initialization error

  - by kevzettler

  I'm trying to compile an open source project on OSX that has only been tested on Linux. $: g++ -v Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1 Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn) Target: x86_64-apple-da I'm trying to compile with the following command line options g++ -MMD -Wall -std=c++0x -stdlib=libc++ -Wno-sign-compare -Wno-unused-variable -ftemplate-depth=1024 -I /usr/local/Cellar/boost/1.55.0/include/boost/ -g -O3 -c level.cpp -o obj-opt/level.o I am seeing several errors that look like this: ./square.h:39:70: error: chosen constructor is explicit in copy-initialization int strength = 0, double flamability = 0, map<SquareType, int> constructions = {}, bool ticking = false); The project states the following are requirements for the Linux setup. How can I confirm I'm making that? gcc-4.8.2 git libboost 1.5+ with libboost-serialize libsfml-dev 2+ (Ubuntu ppa that contains libsfml 2: ) freeglut-dev libglew-dev

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• Loosely coupled implicit conversion

  - by ltjax

  Implicit conversion can be really useful when types are semantically equivalent. For example, imagine two libraries that implement a type identically, but in different namespaces. Or just a type that is mostly identical, except for some semantic-sugar here and there. Now you cannot pass one type into a function (in one of those libraries) that was designed to use the other, unless that function is a template. If it's not, you have to somehow convert one type into the other. This should be trivial (or otherwise the types are not so identical after-all!) but calling the conversion explicitly bloats your code with mostly meaningless function-calls. While such conversion functions might actually copy some values around, they essentially do nothing from a high-level "programmers" point-of-view. Implicit conversion constructors and operators could obviously help, but they introduce coupling, so that one of those types has to know about the other. Usually, at least when dealing with libraries, that is not the case, because the presence of one of those types makes the other one redundant. Also, you cannot always change libraries. Now I see two options on how to make implicit conversion work in user-code: The first would be to provide a proxy-type, that implements conversion-operators and conversion-constructors (and assignments) for all the involved types, and always use that. The second requires a minimal change to the libraries, but allows great flexibility: Add a conversion-constructor for each involved type that can be externally optionally enabled. For example, for a type A add a constructor: template <class T> A( const T& src, typename boost::enable_if<conversion_enabled<T,A>>::type* ignore=0 ) { *this = convert(src); } and a template template <class X, class Y> struct conversion_enabled : public boost::mpl::false_ {}; that disables the implicit conversion by default. Then to enable conversion between two types, specialize the template: template <> struct conversion_enabled<OtherA, A> : public boost::mpl::true_ {}; and implement a convert function that can be found through ADL. I would personally prefer to use the second variant, unless there are strong arguments against it. Now to the actual question(s): What's the preferred way to associate types for implicit conversion? Are my suggestions good ideas? Are there any downsides to either approach? Is allowing conversions like that dangerous? Should library implementers in-general supply the second method when it's likely that their type will be replicated in software they are most likely beeing used with (I'm thinking of 3d-rendering middle-ware here, where most of those packages implement a 3D vector).

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• How would I use for_each to delete every value in an STL map?

  - by stusmith

  Suppose I have a STL map where the values are pointers, and I want to delete them all. How would I represent the following code, but making use of std::for_each? I'm happy for solutions to use Boost. for( stdext::hash_map<int, Foo *>::iterator ir = myMap.begin(); ir != myMap.end(); ++ir ) { delete ir->second; // delete all the (Foo *) values. } (I've found Boost's checked_delete, but I'm not sure how to apply that to the pair<int, Foo *> that the iterator represents). (Also, for the purposes of this question, ignore the fact that storing raw pointers that need deleting in an STL container isn't very sensible).

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• How to programmatically query bash completion for given string

  - by Ryan McKay

  I want to ask bash how it would complete a string as if I had typed it in a shell and hit tab. For example, if I type ls /[TAB][TAB] I see the list of files and dirs in / that could possibly complete the ls command. How do I ask bash how it would complete 'ls /' without typing it and hitting tab? I want something like: query_complete 'partial command line string' I read the man page for complete and compgen, but couldn't figure out how to do it with them. Note: 'ls /' is not the actual command I'm interested in, just an example. I am looking for a general solution for any arbitrary string representing a partial command line.

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• Excel CSV import treating quoted strings of numbers as numeric values, not strings

  - by MichaelOryl

  I've got a web application that is exporting its data to a CSV file. Here's one example row of the CSV file in question: 28,"65154",02/21/2013 00:00,"false","0316295","8316012,8315844","MALE" Since I can't post an image, I'll have to explain the results in Excel. The "0316295" field gets turned into a number and the leading 0 goes away. The "8316012,8315844" gets interpreted as one single number: 83,160,128,315,844. That is, most obviously, not the intended result. I've seen people recommend a leading single quote for such cases, but that doesn't really work either. 28,"65154",02/21/2013 00:00,"false","'0316295","'8316012,8315844","MALE" The single quote is visible at all times in the cell in Excel, though if I enter a number with a leading single quote myself, it shows just the intended string and not the single quote with the string. Importing is not the same as typing, it seems. Anybody have a solution here?

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• Blocking apache access via user agent string

  - by Tchalvak

  I've got a scripter who is using a proxy to attack a website I'm serving. I've noticed that they tend to access the site via software with a certain common user agent string (i.e. http://www.itsecteam.com/en/projects/project1_page2.htm "Havij advanced sql injection software" with a user_agent string of Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727) Havij). I'm aware that any cracking software worth it's salt will probably be able to modify it's user agent string, but I'm fine with the scripter having to deal with that feature at some point. So, is there any software out there for automatically blocking access & permanently blacklisting by matching user agent strings?

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• How to properly diagram lambda expressions or traversals through them in Architecture Explorer?

  - by MainMa

  I'm exploring a piece of code in Architecture Explorer in Visual Studio 2010 to study the relations between methods. I noticed a strange behavior. Take the following source code. It generates a hello message based on a template and a template engine, the template engine being a method (a sort of strategy pattern simplified at a maximum for demo purposes). public string GenerateHelloMessage(string personName) { return this.ApplyTemplate( this.DefaultTemplateEngine, this.GenerateLocalizedHelloTemplate(), personName); } private string GenerateLocalizedHelloTemplate() { return "Hello {0}!"; } public string ApplyTemplate( Func<string, string, string> templateEngine, string template, string personName) { return templateEngine(template, personName); } public string DefaultTemplateEngine(string template, string personName) { return string.Format(template, personName); } The graph generated from this code is this one: Change the first method from this: public string GenerateHelloMessage(string personName) { return this.ApplyTemplate( this.DefaultTemplateEngine, this.GenerateLocalizedHelloTemplate(), personName); } to this: public string GenerateHelloMessage(string personName) { return this.ApplyTemplate( (a, b) => this.DefaultTemplateEngine(a, b), this.GenerateLocalizedHelloTemplate(), personName); } and the graph becomes: While semantically identical, those two versions of code produce different dependency graphs, and Architecture Explorer shows no trace of the lambda expression (while Visual Studio's code coverage, for example, shows them, as well as Code analysis seems to be able to understand that the link exists). How would it be possible, without changing the source code, to: Either force Architecture Explorer to display everything, including lambda expressions, Or make it traverse lambda expressions while drawing a dependency through them (so in this case, drawing the dependency from GenerateHelloMessage to DefaultTemplateEngine in the second example)?

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• Why does my mic boost automatically go to 100 on every boot?

  - by Ben

  When my computer turns on, it automatically sets the "mic boost" sound setting to 100. This causes a loud static sound in my speakers. I can manually go to alsamixer and turn the mic boost down manually, but I would prefer it if I didn't have to do this every time I turn the computer on. I've tried running sudo alsactl store after fixing the settings, and this does save them, but I have to run sudo alsactl restore to restore the settings. This means that I have to manually fix the sound every time I start the computer anyway, so it isn't really a fix. I tried putting sudo alsactl restore in my startup programs, but that didn't seem to fix anything. I'm running Ubuntu 12.04, but I started having this problem before upgrading from 11.10. I'm using a Sony Vaio laptop. I'm not really sure what made it start; it seemed like I just started having the problem randomly one day. Any help would be appreciated! Edit: here is the output from running amixer: http://paste.ubuntu.com/1060080/

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• ASp.NEt MVC: how to parse url string to get RouteData

  - by Feryt

  Hi. Is there any way hot to get RouteData from url string? I have login form with returlUrl as query string parameter. My routes are defined as : {languageCode}/{controller}/{action} In action method LogIn(string returlUrl) the returlUrl is something like "en/home/contacts" etc. I need to change languagePart a i dont want to use string.Replace, as routes may change in future. Thank you.

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• Help with regex to detect urls in a string

  - by Ali Taha Ali Mahboub

  Hi guys i found this regex to detect urls in a string and wraps them inside the tag public static String detectUrls(String text) { String newText = text .replaceAll("(?<!http://)www\\.[\\w/%.\\-?&=]+", "http://$0") .replaceAll("(?:https?|ftps?|http?)://[\\w/%.\\-?&=]+", "<a href='$0'>$0</a>"); return newText; } but this regex doesn't work with the following pattern: https://www.myserver.com so please advise.

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• Manually parse string as XAML Attribute

  - by bitbonk

  How does the XAML Parser convert the string "Red" in Foreground="Red" to a SolidColorBrush? Allthough I know the Types have System.ComponentModel.TypeConverter defined, I doupt that the WPF XAML parser acutally always uses those to convert the string to the brush. Are there any XAML APIs apart from XamlReader.Load (wich wants a valid xml string) that I could use to parse a single string as if it where an attibute for a certain property?

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• SQL: convert tokens in a string or elements of an array into rows of a table

  - by slowpoison

  Is there a simple way in SQL to convert a string or an array to rows of a table? For example, let's stay the string is 'a,b,c,d,e,f,g'. I'd prefer an SQL statement that takes that string, splits it at commas and inserts the resulting strings into a table. In PostgreSQL I can use regexp_split_to_array() and split the string into an array. So, if you know a way to insert an array's elements as rows into a table, that would work too.

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• Nothing else but Regex for matching the string.

  - by Harikrishna

  I want to check whether there is string starting from number and then optional character with the help of the regex.So what should be the regex for matching the string which must be started with number and then character might be there or not.Like there is string "30a" or "30" it should be matched.But if there is "a" or some else character or sereis of characters, string should not be matched.

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• Converting Unicode strings to escaped ascii string

  - by Ali

  How can I convert this string: This string contains the unicode character Pi(p) into an escaped ascii string: This string contains the unicode character Pi(\u03a0) and vice versa ? The current Encoding available in C#, converts the p character into "?". I need to preserve that character.

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• How to format this string in c#

  - by Rohit

  I have a setting stored in database which has a value .jpg|.gif|.png . I want to display it on frontend as ".jpg",".gif" and ".png" in a single string. for example Allowed formats are ".jpg",".gif" and ".png" I was able to seperate it using string fileTypes = String.Join(",", supportedFileTypes.Split('|')) How to specify and clause before the last string. It has to be dynamic. For example if we have .jpg|.gif in database, it should be Allowed formats are ".jpg" and ".gif".

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• Case-Insensitive String Comparison not working in C#?

  - by SB2055

  Based on the answer to this question: C# Case insensitive string compare I'm trying to do a case-insensitive comparison without using Compare or ToLower: var user = db.Users.FirstOrDefault(s => String.Equals(s.Username, username, StringComparison.OrdinalIgnoreCase)); However I get an error: Incorrect number of arguments supplied for call to method 'Boolean Equals(System.String, System.String, System.StringComparison)' What am I doing wrong?

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• Render an asp.net control from a text string

  - by madness

  Hi All, I'm not sure if it is possible to render an asp.net control from a string. The string contains fragments of html code and I've tried rendering that string to a div tag with runat="server" set, asp panel contain, asp lalbel control and asp literal control. All of them doesn't render the asp control in that text to an actual control, it just come up as a string. I've tried adding <% % around them and it appears it doesn't like it. Thanks in advance.

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• cocoa - converting a double to string

  - by Mike

  I have a double number and I would like to convert it to string. The number is, for example, something like 24.043333332154465777... but if I convert it to string using something like NSString *myString = [NSString stringWithFormat:@"%f", myDouble]; The string is just 24.043333 how do I get a full string the corresponds to the whole double number? What other methods do I have to convert this?

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• C++ Program Always Crashes While doing a std::string assign

  - by bbazso

  I have been trying to debug a crash in my application that crashes (i.e. asserts a * glibc detected free(): invalid pointer: 0x000000000070f0c0 **) while I'm trying to do a simple assign to a string. Note that I'm compiling on a linux system with gcc 4.2.4 with an optimization level set to -O2. With -O0 the application no longer crashes. E.g. std::string abc; abc = "testString"; but if I changed the code as follows it no longer crashes std::string abc("testString"); So again I scratched my head! But the interesting pattern was that the crash moved later on in the application, AGAIN at another string. I found it weird that the application was continuously crashing on a string assign. A typical crash backtrace would look as follows: #0 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 (gdb) bt #0 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 #1 0x00007f2c2663dbc3 in abort () from /lib64/libc.so.6 #2 0x00000000004d8cb7 in people_streamingserver_sighandler (signum=6) at src/peoplestreamingserver.cpp:487 #3 <signal handler called> #4 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 #5 0x00007f2c2663dbc3 in abort () from /lib64/libc.so.6 #6 0x00007f2c26680ce0 in ?? () from /lib64/libc.so.6 #7 0x00007f2c270ca7a0 in std::string::assign (this=0x7f2c21bc8d20, __str=<value optimized out>) at /home/bbazso/ThirdParty/sources/gcc-4.2.4/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/basic_string.h:238 #8 0x00007f2c21bd874a in PEOPLESProtocol::GetStreamName (this=<value optimized out>, pRawPath=0x2342fd8 "rtmp://127.0.0.1/mp4:pop.mp4", lStreamName=@0x7f2c21bc8d20) at /opt/trx-HEAD/gcc/4.2.4/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../../include/c++/4.2.4/bits/basic_string.h:491 #9 0x00007f2c21bd9daa in PEOPLESProtocol::SignalProtocolCreated (pProtocol=0x233a4e0, customParameters=@0x7f2c21bc8de0) at peoplestreamer/src/peoplesprotocol.cpp:240 This was really weird behavior and so I started to poke around further in my application to see if there was some sort of memory corruption (either heap or stack) error that could be occurring that could be causing this weird behavior. I even checked for ptr corruptions and came up empty handed. In addition to visual inspection of the code I also tried the following tools: Valgrind using both memcheck and exp-ptrcheck electric fence libsafe I compiled with -fstack-protector-all in gcc I tried MALLOC_CHECK_ set to 2 I ran my code through lint checks as well as cppcheck (to check for mistakes) And I stepped through the code using gdb So I tried a lot of stuff and still came up empty handed. So I was wondering if it could be something like a linker issue or a library issue of some sort that could be causing this problem. Are there any know issues with the std::string that make is susceptible to crashing in -O2 or maybe it has nothing to do with the optimization level? But the only pattern that I can see thus far in my problem is that it always seems to crash on a string and so I was wondering if anyone knew of any issues that my be causing this type of behavior. Thanks a lot!

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• How to read empty string in c

  - by russell

  I have a problem with reading empty string in c.I want to read string from the following - 1.ass 2.ball 3.(empty) 4.cat but when i use gets() it does not treat (empty) as string[3].it read 'cat' as string[3].So how can i solve this problem.Which thing should i use?? plz someone help.

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• formtastic - :string field value as Array and not found-s

  - by Alexey Poimtsev

  Hi, is there any possibility to send from formtastic form value of :string field like - semantic_form_for :project do |form| - form.inputs do = form.input :task_ids, :as => :string as Array? Currently value of this field is sending as String and i'd like to no parse this string in controller. Also, could you give me idea - if task with submitted id is not found - what is best way to catch this situation - validation in controller or what?

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• Change A Character In A String Using Actionscript

  - by Joshua

  What is the opposite of String.charAt()?? If I Have a string: var Str:String="Hello World"; How do I change the 5th character, for example, from a ' ' to an '_'? I can GET the 5th character like this: var C:String=Str.charAt(5); But how do I SET the 5th character? Thanks in advance.

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• read length of string from stdin

  - by teoz

  I want to take a string from stdin but I don't want a static array of fixed size I know that scanf need something where save the stdin input, but I can't do something like this: char string[10] scanf("%s",string); becouse I need to know before how long will be the string in order to allocate the right memory space. Can you help me to resolve this problem?

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• Convert string from UTF-8 to ISO 8859-1 in Java

  - by Derk

  I want to encode a UTF-8 string to a ISO 8859- string in Java I have this: String title = new String(item.getTitle().getText().getBytes("ISO-8859-1")); But it isn't working, the output is Sørensen for example

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