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• boost::enable_if class template method

  - by aaa

  I got class with template methods that looks at this: struct undefined {}; template<typename T> struct is_undefined : mpl::false_ {}; template<> struct is_undefined<undefined> : mpl::true_ {}; template<class C> struct foo { template<class F, class V> typename boost::disable_if<is_undefined<C> >::type apply(const F &f, const V &variables) { } template<class F, class V> typename boost::enable_if<is_undefined<C> >::type apply(const F &f, const V &variables) { } }; apparently, both templates are instantiated, resulting in compile time error. is instantiation of template methods different from instantiation of free functions? I have fixed this differently, but I would like to know what is up. Thank you

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• How to use the boost lexical_cast library for just for checking input

  - by Inverse

  I use the boost lexical_cast library for parsing text data into numeric values quite often. In several situations however, I only need to check if values are numeric; I don't actually need or use the conversion. So, I was thinking about writing a simple function to test if a string is a double: template<typename T> bool is_double(const T& s) { try { boost::lexical_cast<double>(s); return true; } catch (...) { return false; } } My question is, are there any optimizing compilers that would drop out the lexical_cast here since I never actually use the value? Is there a better technique to use the lexical_cast library to perform input checking?

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• Custom (pool) allocator with boost shared_ptr

  - by myahya

  I want objects managed by a shared_ptr to be allocated from a pool, say Boost's Pool interface, how can this be achieved?

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• Boost: Although compiled, missing lib

  - by Jonathan

  I've compiled Boost and am using it in a Visual C++ project. At some point, I started getting the following error: 1>LINK : fatal error LNK1104: cannot open file 'libboost_filesystem-vc100-mt-sgd-1_45.lib' AFAIK I have the linker configuration set correctly. I've searched for the lib and the closest I found was: libboost_filesystem-vc100-mt-gd-1_45.lib (Notice the missing 's') What does the missing 's' represent? What do these similar yet different libs stand for? How come I'm missing it although I've compiled all of Boost?

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• boost variant static_visitor problem picking correct function

  - by Steve

  I'm sure I'm having a problem with template resolution here, but I'm not sure why I'm having the problem. I have a static visitor I'm passing to boost variant where i've had to do template specialization for certain cases. The case for everything except for MyClass should throw in the static_visitor below. Unfortunately, when the visitor is applied to pull a MyClass out, it selects the most generic case rather than the exact match. I would type each case explicitly, but that will be rather long. So, why is the compiler resolving the most generic case over the exact match, and is there anyway to fix it template<> class CastVisitor<MyClass>:public boost::static_visitor<MyClass> { public: template<typename U> MyClass operator()(const U & i) const { throw std::exception("Unable to cast"); } MyClass operator()(const MyClass& i) { return i; } };

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• How to use Boost in Visual Studio 2010

  - by Oops

  What is a good step by step explanation on how to use Boost in an empty project in Visual Studio 2010?

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• boost test case for function taking user input

  - by oadams

  I have a function that takes in user input via std::cin: std::getline(std::cin, in); and creates a corresponding data structure by matching it with a regular expression. The function then returns this data structure. I'm using boost.test and I want to create a unit test to check that the output data type is correct given some inputs. However I don't know how to go about it since the input isn't passed as an argument to the function. EDIT: Is there a simple way to create a boost test case that feeds the function a string via standard input?

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• Boost.Log - Multiple processes to one log file?

  - by Kevin

  Reading through the doc for Boost.Log, it explains how to "fan out" into multiple files/sinks pretty well from one application, and how to get multiple threads working together to log to one place, but is there any documentation on how to get multiple processes logging to a single log file? What I imagine is that every process would log to its own "private" log file, but in addition, any messages above a certain severity would also go to a "common" log file. Is this possible with Boost.Log? Is there some configuration of the sinks that makes this easy? I understand that I will likely have the same "timestamp out of order" problem described in the FAQ here, but that's OK, as long as the timestamps are correct I can work with that. This is all on one machine, so no remote filesystem problems either.

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• Linker Error : Statically Linking of Boost Serialization Library

  - by Manikanda raj S

  I'm trying to link the Boost Serialization Library to my Code. But it doesn't seem to be working. g++ serialize.cpp -L"/usr/local/lib/libboost_serialization.a" Error : /tmp/ccw7eX4A.o: In function boost::archive::text_oarchive::text_oarchive(std::basic_ostream<char, std::char_traits<char> >&, unsigned int)': serializep.cpp:(.text._ZN5boost7archive13text_oarchiveC2ERSoj[_ZN5boost7archive13text_oarchiveC5ERSoj]+0x25): undefined reference toboost::archive::text_oarchive_impl::text_oarchive_impl(std::basic_ostream &, unsigned int)' .......... collect2: ld returned 1 exit status But when i link as a shared library, g++ serialize.cpp -lboost_serialization , it works fine. What am i missing here P.S : Other StackOverflow posts with the same question has no answers that work for the above error

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• how to change the default open-with program to a program on the second disk

  - by Scott????

  I have a 250GB HDD for my system and a 60GB SSD using a SATA port. I installed most of my applications on the SSD. There's a strange thing though. I can not change the default open-with program to a program which is on the SSD. I think it may be caused by permission so I gave my user a 'full control' permission on the security tab in disk properties. But changing permissions is not work. After I choose an application (I've tried Notepad++, Sublime, 7Zip, etc.), nothing is added in the below window: Also, if I install 7Zip on my machine, the right click menu items can not be added.

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• Can I use boost::make_shared with a private constructor?

  - by Billy ONeal

  Consider the following: class DirectoryIterator; namespace detail { class FileDataProxy; class DirectoryIteratorImpl { friend class DirectoryIterator; friend class FileDataProxy; WIN32_FIND_DATAW currentData; HANDLE hFind; std::wstring root; DirectoryIteratorImpl(); explicit DirectoryIteratorImpl(const std::wstring& pathSpec); void increment(); public: ~DirectoryIteratorImpl() {}; }; class FileDataProxy //Serves as a proxy to the WIN32_FIND_DATA struture inside the iterator. { friend class DirectoryIterator; boost::shared_ptr<DirectoryIteratorImpl> iteratorSource; FileDataProxy(boost::shared_ptr<DirectoryIteratorImpl> parent) : iteratorSource(parent) {}; public: std::wstring GetFolderPath() const { return iteratorSource->root; } }; } class DirectoryIterator : public boost::iterator_facade<DirectoryIterator, detail::FileDataProxy, std::input_iterator_tag> { friend class boost::iterator_core_access; boost::shared_ptr<detail::DirectoryIteratorImpl> impl; void increment() { impl->increment(); }; detail::FileDataProxy dereference() const { return detail::FileDataProxy(impl); }; public: DirectoryIterator() { impl = boost::make_shared<detail::DirectoryIteratorImpl>(); }; }; It seems like DirectoryIterator should be able to call boost::make_shared<DirectoryIteratorImpl>, because it is a friend of DirectoryIteratorImpl. However, this code fails to compile because the constructor for DirectoryIteratorImpl is private. Since this class is an internal implementation detail that clients of DirectoryIterator should never touch, it would be nice if I could keep the constructor private. Is this my fundamental misunderstanding around make_shared or do I need to mark some sort of boost piece as friend in order for the call to compile?

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• List categories with checkbox in Wordpress Options?

  - by Keith Donegan

  Hi Guys, How would I go about displaying all of a site’s categories in checkboxes in my options panel? I can get a dropdown select menu to work, I just have no idea how to implement checkboxes. Code Here from Net Tuts: http://net.tutsplus.com/tutorials/wordpress/how-to-create-a-better-wordpress-options-panel/ http://pastie.org/885320 Thanks in advance.

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• c program output

  - by sandy101

  HELLO , I am trying some program and confused with the output of the program #include #define a(x) (x*x) int main() { int i=3,j; j=a(i+1); printf("%d",j); return 0 ; } i want to know why the program is not giving the output 16(as instead to that i an getting the output 7 for the above program )

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• How many ways a java Program can end ?

  - by Frank

  I know use System.exit(0) can end a java program, for instance, if I have a JFrame window, it will close and end the program, but I wonder how many other ways, can it be closed and the program be ended ? Including when an error occurs, will the program be shut down and the JFrame be closed ?

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• Strange options menu behavior in Android TabActivity

  - by jboxer

  I have a TabActivity with four tabs (each is its own Activity). Each tab defines its own onCreateOptionsMenu (and in some cases, onPrepareOptionsMenu). When each tab is loaded, an AsyncTask is kicked off to retrieve the data needed to populate that tab's list. If I switch between tabs very quickly (while they're still loading) and then press the menu button (while the current tab's AsyncApiTask is still running), I'm able to get the wrong options menu to appear. For example, let's say FooActivity (tab 1) has an options menu with a "Refresh" item, and BarActivity (tab 2) has an options menu with a "View All" item. If I start the app (with tab 1 active), quickly switch to tab 2, and then hit menu, the "Refresh" item (rather than the expected "View All" item) will sometimes show. Furthermore, while this weird behavior sometimes occurs just on the first menu press (and later presses show the right items), sometimes it gets "stuck", and the wrong items show up on every press until I switch tabs. Any idea what could be going on? I haven't heard of this happening before, and haven't been able to find any good suggestions.

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• Software included in Adobe Partner Connection Solution Partner Program

  - by ymasood

  Hi, I'd like to know what software is available in the Adobe Partner Connection Solution Partner Program at the Bronze level. The linked page above states, 'Not for Resale (NFR) downloads for Adobe enterprise products — Limited Use licenses' however, what are the contents here? I've tried a lot but couldn't hit any page in Google that would help. Any help in this regard is much appreciated, thanks! Yasser

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• create jquery array to use as options

  - by SoulieBaby

  Hi all, I'm sure this is really simple, but I can't seem to get it working. I have a "time" select list, which has a number as "rel" attached to each option. If the user changes the time select, I want a new list of options to display depending on what is selected. If that makes sense? Here's my first select: <select name="time" id="time"> <option value="7:00am" rel="10">7:00am</option> <option value="12:30pm" rel="16">12:30pm</option> </select> If the user selects 7:00am, I want a new option list (using jquery) to give options from 1 - 10. Like this: <select name="quantity" id="quantity"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> ............................ <option value="10">10</option> </select> Here's what I have so far... <script type="text/javascript" language="javascript"> jQuery("#time").change(function(){ var positions = jQuery("#time :selected").attr("rel"); //this grabs the rel from time //this is where it should create a list of options to append(??) to the select list.. jQuery("#showQuantity").show(); //this shows the hidden field for quantity }); </script> I hope it makes sense, but I'm stuck on it. Thank you in advance :)

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• Best practice guide to install to Program Files

  - by Cold T

  Have seen quite a few questions in Serverfault and Super User but none that specifically answers my question. We have an application that is being provided and installed by a third party company. They are charging market rate 'consultancy' fee to do this. They installed majority of the folders in the root of the C drive, to my shock. Are there any official Microsoft Best Practice guides out there to say applications should be installed in Program Files.

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• Enterprise distribution Program for iPhone

  - by Mohammed Sadiq

  Hi all, I would like to implement a application which backs up all the internal datas like sms, mms, videos, audios, documents, call history stored in iPhone. But this seems to be not possible with api docs that the apple has released so far ... I have gone through the pdf of ENterprise distribution program and some of the links related to Enterprise Distribution Program, specifies about the Remote wipe and accessing of internal datas like Calendar, sms, mms ect .... But they didnt mention how to do it programmatically. Does Apple provide any special priviledges like extra api support to access the internal data in their Enterprise Distribution Program?. Is there any difference between Enterprise Distribution Program and Standard Distribution Program in the development point of view? And since in-house distribution does not require Apple approval, shall we use some other method which are not officially mentioned in apple docs, to access the internal stored data .. If so can anyone point out the way to do it? Any help would be greatly appreciated awaiting for your response Best regards, Mohammed Sadiq ....

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• Java program strange behavior, how to fix it ?

  - by Frank

  My notebook has Intel CPU, running Windows Vista. My program looks like this : public class Tool_Lib_Simple { public static void main(String[] args) { System.out.println("123"); } } When I run it, I expect to see : "123", but the output was : "Hi NM : How are you NM ?" which was the old output from two days ago before I changed my program. If I copy this program into another project in Netbean 6.7, it will run correctly and output "123", and if I change the program name from "Tool_Lib_Simple" to something else, it will also output "123", but just not under the name of "Tool_Lib_Simple" in the current project's src directory, I've deleted the "build" directory and did re-compile, re-build, it still gives me "Hi NM : How are you NM ?" as a result, seems to me the old version of my program is saved in the hard drive or ram and got stuck there, I've programmed many years, hardly ever encounter this kind of problem, how to fix this ? Frank

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• A program that creates another program

  - by zaidwaqi

  Hi, I need to create a program that creates another program but not a compiler though. For example, I write a program that accepts a string input from the user. Let's say user enter "Pluto". This program should then create a separate .exe that says "Hello Pluto" when executed. How can I do this? If you could give example in C# and Windows Forms, it's better. Thanks.

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• Self-imposed lockout from program

  - by Alex

  I'm plagued with a lack of willpower. I recently started looking for solutions, and came across a program for macs called SelfControl which completely blocks one's access to a given set of websites for a given period of time (you can delete the program/restart your computer/do almost anything and it will still block those sites for the specified time period, and doesn't require a password to do it.) Unfortunately, there are no windows analogues. The one that comes the closest is Cold Turkey. It has the functionality whereby you set a time in the future, specify a list of websites (or programs - eg explorer, firefox, chrome) and you are blocked from accessing them for the whole duration. No password can undo it, no system reboot, etc. The problem is that the program is a buggy piece of garbage, and in order to ensure that you're not locked out from websites forever, you have to run an uninstaller which is just an exe file accessible at any time which completely defeats the purpose of a self-imposed program lockout. I want to make a better version of that program, or find a simple way to prevent access to a given set of programs over a given period of time with no way around it. I've only taken a few introductory courses in java (math major), but the internet is really having a negative effect on my studies, and the only way I can do work is to eliminate all distractions. What do I need to learn in order to make a program with the following properties: Given a set of .exe files, and a time in the future , this program will prevent access to the given .exe files until current time = given time restarting the computer doesn't interfere with the program, one can't uninstall the program until current time = given time, one can't create another instance of the program to block itself I don't care how much programming knowledge i need to acquire in order to make this program, so please give me a specific list of things that I need to study in order to make this happen, or if something like this exists, then please let me know.

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• How to link to dynamic boost libs?

  - by testingmysql

  I compiled boost lib and got these. //Shared/dynamic link libraries 24/03/2010 11:25 PM 53,248 boost_thread-vc80-mt-1_42.dll 24/03/2010 11:25 PM 17,054 boost_thread-vc80-mt-1_42.lib 24/03/2010 11:25 PM 17,054 boost_thread-vc80-mt.lib 24/03/2010 11:25 PM 73,728 boost_thread-vc80-mt-gd-1_42.dll 24/03/2010 11:25 PM 17,214 boost_thread-vc80-mt-gd-1_42.lib 24/03/2010 11:25 PM 17,214 boost_thread-vc80-mt-gd.lib // Static libs... does not need any dlls 24/03/2010 11:25 PM 381,716 libboost_thread-vc80-mt-1_42.lib 24/03/2010 11:25 PM 381,716 libboost_thread-vc80-mt.lib 24/03/2010 11:25 PM 999,552 libboost_thread-vc80-mt-gd-1_42.lib 24/03/2010 11:25 PM 999,552 libboost_thread-vc80-mt-gd.lib 24/03/2010 11:25 PM 421,050 libboost_thread-vc80-mt-s-1_42.lib 24/03/2010 11:25 PM 421,050 libboost_thread-vc80-mt-s.lib 24/03/2010 11:25 PM 1,015,688 libboost_thread-vc80-mt-sgd-1_42.lib 24/03/2010 11:25 PM 1,015,688 libboost_thread-vc80-mt-sgd.lib In Visual Studio, I have written a test app using the boost thread library. Based on code generation settings it asks for these four libs only (like multithreading debug, multithreading, multithreading debug dll, and multithreading dll) 24/03/2010 11:25 PM 381,716 libboost_thread-vc80-mt-1_42.lib 24/03/2010 11:25 PM 381,716 libboost_thread-vc80-mt.lib 24/03/2010 11:25 PM 999,552 libboost_thread-vc80-mt-gd-1_42.lib 24/03/2010 11:25 PM 999,552 libboost_thread-vc80-mt-gd.lib 24/03/2010 11:25 PM 421,050 libboost_thread-vc80-mt-s-1_42.lib 24/03/2010 11:25 PM 421,050 libboost_thread-vc80-mt-s.lib 24/03/2010 11:25 PM 1,015,688 libboost_thread-vc80-mt-sgd-1_42.lib 24/03/2010 11:25 PM 1,015,688 libboost_thread-vc80-mt-sgd.lib Now my question is how can I link my app to the other 2 libs so that it uses the dlls? 24/03/2010 11:25 PM 53,248 boost_thread-vc80-mt-1_42.dll 24/03/2010 11:25 PM 17,054 boost_thread-vc80-mt-1_42.lib 24/03/2010 11:25 PM 17,054 boost_thread-vc80-mt.lib 24/03/2010 11:25 PM 73,728 boost_thread-vc80-mt-gd-1_42.dll 24/03/2010 11:25 PM 17,214 boost_thread-vc80-mt-gd-1_42.lib 24/03/2010 11:25 PM 17,214 boost_thread-vc80-mt-gd.lib Question 2. What does the g, s stands for?

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• Composite key syntax in Boost MultiIndex

  - by Sarah

  Even after studying the examples, I'm having trouble figuring out how to extract ranges using a composite key on a MultiIndex container. typedef multi_index_container< boost::shared_ptr< Host >, indexed_by< hashed_unique< const_mem_fun<Host,int,&Host::getID> >, // ID index ordered_non_unique< const_mem_fun<Host,int,&Host::getAgeInY> >, // Age index ordered_non_unique< const_mem_fun<Host,int,&Host::getHousehold> >, // Household index ordered_non_unique< // Age & eligibility status index composite_key< Host, const_mem_fun<Host,int,&Host::getAgeInY>, const_mem_fun<Host,bool,&Host::isPaired> > > > // end indexed_by > HostContainer; My goal is to get an iterator pointing to the first of the subset of elements in HostContainer hmap that has age partnerAge and returns false to Host::isPaired(): std::pair< hmap::iterator,hmap::iterator > pit = hmap.equal_range(boost::make_tuple( partnerAge, false ) ); I think this is very wrong. How/Where do I specify the iterator index (which should be 3 for age & eligibility)? I will include other composite keys in the future. What exactly are the two iterators in std::pair? (I'm copying syntax from an example that I don't understand.) I would ideally use std::count to calculate the number of elements of age partnerAge that are eligible (return false to Host::isPaired()). What is the syntax for extracting the sorted index that meets these requirements? I'm obviously still learning C++ syntax. Thanks in advance for any help.

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• Mocking with Boost::Test

  - by Billy ONeal

  Hello everyone :) I'm using the Boost::Test library for unit testing, and I've in general been hacking up my own mocking solutions that look something like this: //In header for clients struct RealFindFirstFile { static HANDLE FindFirst(LPCWSTR lpFileName, LPWIN32_FIND_DATAW lpFindFileData) { return FindFirstFile(lpFileName, lpFindFileData); }; }; template <typename FirstFile_T = RealFindFirstFile> class DirectoryIterator { //.. Implementation } //In unit tests (cpp) #define THE_ANSWER_TO_LIFE_THE_UNIVERSE_AND_EVERYTHING 42 struct FakeFindFirstFile { static HANDLE FindFirst(LPCWSTR lpFileName, LPWIN32_FIND_DATAW lpFindFileData) { return THE_ANSWER_TO_LIFE_THE_UNIVERSE_AND_EVERYTHING; }; }; BOOST_AUTO_TEST_CASE( MyTest ) { DirectoryIterator<FakeFindFirstFile> LookMaImMocked; //Test } I've grown frustrated with this because it requires that I implement almost everything as a template, and it is a lot of boilerplate code to achieve what I'm looking for. Is there a good method of mocking up code using Boost::Test over my Ad-hoc method? I've seen several people recommend Google Mock, but it requires a lot of ugly hacks if your functions are not virtual, which I would like to avoid. Oh: One last thing. I don't need assertions that a particular piece of code was called. I simply need to be able to inject data that would normally be returned by Windows API functions.

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