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• C# Lists, Foreach, and Types

  - by user406470

  I was wondering if there is a version of foreach that checks only for a specific type and returns it. For example consider this class tree: org.clixel.ClxBasic - org.clixel.ClxObject - org.clixel.ClxSprite - WindowsGame1.test Then consider this code public List<ClxBasic> objects = new List<ClxBasic>(); foreach(GroupTester tester in objects) { tester.GroupTesterOnlyProperty = true; } tester.GroupTesterOnlyProperty is a property created in GroupTester. Is there some way to make something like this work, like an overload of foreach, or another snippet that might help me? I want to make it easy for a programmer to sort through the lists grabbing only what type they need.

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• How do I know if a boost thread is done ?

  - by jules

  I am using boost::thread to process messages in a queue. When a first message comes I start a message processing thread. When a second message comes I check if the message processing thread is done. if it is done I start a new one if it is not done I don nothing. How do I know if the thread is done ? I tried with joinable() but it is not working, as when the thread is done, it is still joinable. I also tried to interrupt the process at once, and add an interruption point at the end of my thread, but it did not work. Thanks

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• How do I insert format str and don't remove the matched regular expression in input string in boost:

  - by Yadollah

  I want to put space between punctuations and other words in a sentence. But boost::regex_replace() replaces the punctuation with space, and I want to keep a punctuation in the sentence! for example in this code the output should be "Hello . hi , " regex e1("[.,]"); std::basic_string<char> str = "Hello.hi,"; std::basic_string<char> fmt = " "; cout<<regex_replace(str, e1, fmt)<<endl; Can you help me?

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• Traverse multi dimensional array recusively without using foreach

  - by ejaz

  I have an array like this and the code using foreach loop. $arr = array( array ( array( 'CAR_TIR', 'Tires', 100 ), array( 'CAR_OIL', 'Oil', 10 ), array( 'CAR_SPK', 'Spark Plugs', 4 ) ), array ( array( 'VAN_TIR', 'Tires', 120 ), array( 'VAN_OIL', 'Oil', 12 ), array( 'VAN_SPK', 'Spark Plugs', 5 ) ), array ( array( 'TRK_TIR', 'Tires', 150 ), array( 'TRK_OIL', 'Oil', 15 ), array( 'TRK_SPK', 'Spark Plugs', 6 ) ) ); function recarray($array) { foreach($array as $key=>$value) { if(is_array($value)) { RecArray($value); } else { echo "key = $key value = $value"; } } } recarray($arr); I have to traverse the array using recursion and without using foreach. I would appreciate it if any one can help me

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• Best practice for creating objects used in for/foreach loops

  - by StupidDeveloper

  Hi! What's the best practice for dealing with objects in for or foreach loops? Should we create one object outside the loops and recreate it all over again (using new... ) or create new one for every loop iteration? Example: foreach(var a in collection) { SomeClass sc = new SomeClass(); sc.id = a; sc.Insert(); } or SomeClass sc = null; foreach(var a in collection) { sc = new SomeClass(); sc.id = a; sc.Insert(); } Which is better?

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• Powershell enters foreach loop with null object

  - by SteB

  I'm listing all backups in a given directory: $backups = Get-ChildItem -Path $zipFilepath | Where-Object {($_.lastwritetime -lt (Get-Date).addDays(-7)) -and (-not $_.PSIsContainer) -and ($_.Name -like "backup*")} If I set it to deliberately return no files (.addDays(-600) then the following prints "Empty" (as expected): if (!$backups) { "Empty" } If I try to list the names with an empty $backups variable: foreach ($file in $backups) { $file.FullName; } I get nothing (as expected), if I change this to: "test"+ $file.FullName; then I get a single "test" under the "Empty". How is this possible if $backups is empty?

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• how to find all occurrences in REGEX with

  - by Vincenzo

  My code is: #include <boost/regex.hpp> boost::cmatch matches; boost::regex_match("alpha beta", matches, boost::regex("([a-z])+")); cout << "found: " matches.size() << endl; And it shows found: 2 which means that only ONE occurrence is found… How to instruct it to find THREE occurrences? Thanks!

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• Boost.MultiIndex: Are there way to share object between two processes?

  - by Arman

  Hello, I have a Boost.MultiIndex big array about 10Gb. In order to reduce the reading I thought there should be a way to keep the data in the memory and another client programs will be able to read and analyse it. What is the proper way to organize it? The array looks like: struct particleID { int ID;// real ID for particle from Gadget2 file "ID" block unsigned int IDf;// postition in the file particleID(int id,const unsigned int idf):ID(id),IDf(idf){} bool operator<(const particleID& p)const { return ID<p.ID;} unsigned int getByGID()const {return (ID&0x0FFF);}; }; struct ID{}; struct IDf{}; struct IDg{}; typedef multi_index_container< particleID, indexed_by< ordered_unique< tag<IDf>, BOOST_MULTI_INDEX_MEMBER(particleID,unsigned int,IDf)>, ordered_non_unique< tag<ID>,BOOST_MULTI_INDEX_MEMBER(particleID,int,ID)>, ordered_non_unique< tag<IDg>,BOOST_MULTI_INDEX_CONST_MEM_FUN(particleID,unsigned int,getByGID)> > > particlesID_set; Any ideas are welcome. kind regards Arman.

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• Why there is no scoped locks for multiple mutexes in C++0x or Boost.Thread?

  - by Vicente Botet Escriba

  C++0x thread library or Boost.thread define non-member variadic template function that lock all lock avoiding dead lock. template <class L1, class L2, class... L3> void lock(L1&, L2&, L3&...); While this function avoid help to deadlock, the standard do not includes the associated scoped lock to write exception safe code. { std::lock(l1,l2); // do some thing // unlock li l2 exception safe } That means that we need to use other mechanism as try-catch block to make exception safe code or define our own scoped lock on multiple mutexes ourselves or even do that { std::lock(l1,l2); std::unique_lock lk1(l1, std::adopted); std::unique_lock lk2(l2, std::adopted); // do some thing // unlock li l2 on destruction of lk1 lk2 } Why the standard doesn't includes a scoped lock on multiple mutexes of the same type, as for example { std::array_unique_lock<std::mutex> lk(l1,l2); // do some thing // unlock l1 l2 on destruction of lk } or tuples of mutexes { std::tuple_unique_lock<std::mutex, std::recursive_mutex> lk(l1,l2); // do some thing // unlock l1 l2 on destruction of lk } Is there something wrong on the design?

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• Setting up separate ctags db's for C/C++ standard libs, boost, and third party libs

  - by Robert S. Barnes

  I want to set up separate ctags databases for various libraries in /usr/include/ for use with OmniCppComplete. The idea is to be able to pull in only the libraries needed for a particular project in the target language - C or C++. For example, I'd like to have one database for the standard C libraries, one for system libraries that might be used by either C or C++ programs ( sockets / networking comes to mind ) one for the standard C++ libs / STL / Boost, and then other databases for various third party libraries such as QT or glib. Then I could pull something in simply by typing set tags+= ~/.vim/somelib.tags in vim. I assume that everything related to the C++ stdlib and STL are in the /usr/include/c++ and that Boost is all in /usr/include/boost. Unfortunately it seems that the standard C libs and system libs are just kind of dumped directly into /usr/include/ with a variety of other stuff. How can I get a list of which files and directories belong to which libs? I'm on Ubuntu 8.04.

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• how do i execute a foreach lambda expression on ObservableCollection<T>

  - by Zain Shaikh

  how do i execute a foreach lambda expression on ObservableCollection there is not method of foreach with ObservableCollection although this method exists with List is there any extension method available?

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• c:forEach.items getting repetitively called

  - by Joshua

  Environment: Seam, Richfaces The following code snippet causes the method getUsers to be called multiple times, how do I avoid this in my application so that it gets called only once. <c:forEach items="#{userHome.getUsers()}" var="_user"> </c:forEach>

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• Difference Between For And Foreach Loop

  - by Asim Sajjad

  Is it better to use the for loop for foreach which is used for collection? As I have heard that for loop is better then foreach as Index based search is better.

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• asp.net mvc user control problem foreach loop

  - by mazhar

  Previous post <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" % <% MvcApplication1.Models.FeaturesRepository _model = new MvcApplication1.Models.FeaturesRepository(); % <% foreach (var md in _model.GetAllFeatures()) { % <%--<% if (md.int_ParentId == 0) { %--% <%= md.vcr_FeaturesName % <%--<% } %--% <% } % It is with reference to the previous post above.Is there something wrong with the foreach loop(The result is correct but it is displaying the series of Add,Add,Add,Add,Add,Add...,which is the last record of the getallfeatures.

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• Converting ObsevableCollection foreach to lambda.

  - by Jitendra Jadav

  Hello Guys, I am working some ObservableCollection converting to lembda it will give me error this is my actual code . foreach (var item in Query) { userDetail.Add(new UserDatail(item.ID,item.Name, item.Address, item.City, item.Pin, item.Phone)); } and I am try to add as lembda Query.ToList().ForEach(x => userDetail.Add(x.ID,x.Name,x.Address,x.City,x.Pin,x.Phone)); This will give me error. Thanks..

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• Rewrite the foreach using lambda + C#3.0

  - by Newbie

  I am tryingv the following foreach (DataRow dr in dt.Rows) { if (dr["TABLE_NAME"].ToString().Contains(sheetName)) { tableName = dr["TABLE_NAME"].ToString(); } } by using lambda like string tableName = ""; DataTableExtensions.AsEnumerable(dt).ToList().ForEach(i => { tableName = i["TABLE_NAME"].ToString().Contains(sheetName); } ); but getting compile time error "cannot implicitly bool to string". So how to achieve the same.? Thanks(C#3.0)

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• Refactoring nested foreach statement

  - by dotnetdev

  Hi, I have a method with a nested foreach collection (iterate a set of objects and then look inside each object). I saw in a book a good pattern to make this much more elegant but cannot remember/find the code example. How else could I make this more tidy? The code is just a typical nested foreach statement so I have not provided a code sample. Thanks

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• Foreach loop problem for Iqueyable object

  - by Vikas

  Hi, Can we use foreach loop for Iqueryable object? I'd like to do something as follow: query = Iqueryable<Myclass> = objDataContext.Myclass; // objDataContext is an object of LINQ datacontext class int[] arr1 = new int[] { 3, 4, 5 }; foreach (int i in arr1) { query = query.Where(q => (q.f_id1 == i || q.f_id2 == i || q.f_id3 == i)); } It gives me wrong output as each time value if i is changed.

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• Javascript Array.forEach HowTo break?

  - by Scott

  [1,2,3].forEach(function(el) { if(el === 1) break; }); How can I do this using the new forEach method of JS?

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• Unset an array element inside a foreach loop

  - by Summer

  I'm accessing an array by reference inside a foreach loop, but the unset() function doesn't seem to be working: foreach ( $this->result['list'] as &$row ) { if ($this_row_is_boring) { unset($row); } } print_r($this->result['list']); // Includes rows I thought I unset Ideas? Thanks!

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• Why does Visual Studio 2010 throw this error with Boost 1.42.0?

  - by ra170

  I'm trying to recompile application, that compiles fine with warning level 4 in visual studio 2005 and visual studio 2008. Since the errors (look below) are coming from std:tr1, I'm thinking there's some conflict, but not sure how to fix. My first thought was to remove all references to boost, such as but then I get an error that it can't find format method. So here's one of the errors: (not sure what it means) Any ideas, suggestions, solutions? Thanks! > c:\program files (x86)\microsoft > visual studio > 10.0\vc\include\type_traits(197): error C2752: > 'std::tr1::_Remove_reference<_Ty>' : > more than one partial specialization > matches the template argument list 1> > with 1> [ 1> > _Ty=bool (__cdecl &)(const BlahBlah &) 1> ] 1> c:\program > files (x86)\microsoft visual studio > 10.0\vc\include\xtr1common(356): could be > 'std::tr1::_Remove_reference<_Ty&&>' > 1> c:\program files > (x86)\microsoft visual studio > 10.0\vc\include\xtr1common(350): or 'std::tr1::_Remove_reference<_Ty&>' 1> > c:\program files (x86)\microsoft > visual studio > 10.0\vc\include\type_traits(962) : see reference to class template > instantiation > 'std::tr1::remove_reference<_Ty>' > being compiled 1> with

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• Letting a new PHP page know a new POST value is an Array?

  - by Wintermute

  I have a page that creates an associative array, then passes it as a hidden value to a new PHP page. I have a foreach loop waiting to iterate through it but it coughs up an "invalid argument" error, as if the page doesn't know the value it's working with is an array (Despite "print" showing simply "Array"). This is essentially what I have: //Hidden input to be passed to the next page print "<input type=\"hidden\" name=\"price_list\" value=\"$item_list\"> //Code on the second page for the foreach loop extract($_POST); foreach($price_list as $name=>$price) { ... } But I am simply given "Warning: Invalid argument supplied for foreach() in /home/cut/mg299/public_html/PHP/invoice.php on line 17". The array works fine, as I can iterate on the previous page, and other values are parsed fine to this second page. Do I need to 'reinitialise' this array value?

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• what use does the javascript for each method have (that map can't do)?

  - by JohnMerlino

  Hey all, The only difference I see in map and foreach is that map is returning an array and foreach is not. However, I don't even understand the last line of the foreach method "func.call(scope, this[i], i, this);". For example, isn't "this" and "scope" referring to same object and isn't this[i] and i referring to the current value in the loop? I noticed on another post someone said "Use forEach when you want to do something on the basis of each element of the list. You might be adding things to the page, for example. Essentially, it's great for when you want "side effects". I don't know what is meant by side effects. Array.prototype.map = function(fnc) { var a = new Array(this.length); for (var i = 0; i < this.length; i++) { a[i] = fnc(this[i]); } return a; } Array.prototype.forEach = function(func, scope) { scope = scope || this; for (var i = 0, l = this.length; i < l; i++) func.call(scope, this[i], i, this); } Finally, are there any real uses for these methods in javascript (since we aren't updating a database) other than to manipulate numbers like this: alert([1,2,3,4].map(function(x){ return x + 1})); //this is the only example I ever see of map in javascript. Thanks for any reply.

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• How to boost system sound output?

  - by infant programmer

  When I use Earphones, I feel that my system output is very low, I have set all the volume output to maximum in "control panel\Sounds and Audio devices", but still not satisfactory. May be my earphones output proportionality is lower. No problem with sub-woofer, I think its because of the amplifier. Is there any software to boost up system volume output to compensate ?

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• Rewrite rules for Drupal Boost with Lighttpd

  - by bsdjunkie

  I have been given the super task of preparing a web site to get hammered.... Or site is drupal based, I have found what could be my answer in the form of Boost. But I can't for the life of me find any information on the Lighttpd rewrite rules to make it function. All suggestion welcome! Thanks

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