June 2010 - Boost-users - lists.preview.boost.org

[boost-users] Compile and Install boost::thread from souce code on Ubuntu
by Boost lzw 17 Jun '10

17 Jun '10

Hi, there, The most updated version of boost on my Ubuntu is 1_40_0. So I choose to compile and install 1_43_0 from source code. During the building process of step 4 (mentioned bellow), I was prompted that boost::thread, boost::mpi, etc. libraries need to be compiled and installed separetly. I ignored them and finished the process. Now I can run the following program sucessfully with // robert@ubuntu:~/boost$ g++ -I /home/robert/src/boost_1_43_0 example.cpp -o example // echo 1 2 3 | ./example for example.cpp =================== #include <iostream> #include <iterator> #include <algorithm> int main() { using namespace boost::lambda; typedef std::istream_iterator<int> in; std::for_each( in(std::cin), in(), std::cout << (_1 * 3) << " " ); } =================== but failed to compile thread.cpp program with robert@ubuntu:~/boost$ g++ -I /home/robert/src/boost_1_43_0 thread.cpp -o thread for the following thread.cpp =================== #include <boost/thread/thread.hpp> #include <iostream> void hello() { std::cout << "Hello world, I'm a thread!" << std::endl; } int main(int argc, char* argv[]) { boost::thread thrd(&hello); thrd.join(); return 0; } =================== The first few complaints I got are: ---------------------------------------------- /tmp/ccwgSZ3d.o: In function `main': thread.cpp:(.text+0x6e): undefined reference to `boost::thread::join()' thread.cpp:(.text+0x7f): undefined reference to `boost::thread::~thread()' thread.cpp:(.text+0xa0): undefined reference to `boost::thread::~thread()' /tmp/ccwgSZ3d.o: In function `boost::detail::thread_data_base::thread_data_base()': How can I compile boost::thread separately for it to work? Thanks a lot. By the way, these are steps I did to compile and install boost_1_43_0 in case that you may want to review it (or I did something wrong): [NOTE: The downloaded boost_1_43_0 source code located at my home directory: ~/src/ ] (0) cd ~/src (1) wget http://sourceforge.net/projects/boost/files/boost/1.43.0/boost_1_43_0.tar.g… (2) tar zxvf boost_1_43_0.tar.gz (3) cd boost_1_43_0 (4) robert@ubuntu:~/src/boost_1_43_0$ sudo ./bootstrap.sh --prefix=/usr/local --show-libraries --with-libraries=all --exec-prefix=/usr/local/bin/ (5) ./bjam install

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boost_tokenizer gives unexpected result
by andrew.marlow＠uk.bnpparibas.com 17 Jun '10

17 Jun '10

I am getting a result from the boost_tokenizer that I do not expect. I wonder if anyone could explain. I have a line which only contains one occurence of the delimiter and it happens to be the first character. I would expect tokenization to yield two tokens, The first would be the empty string, the next would be the word that occurs after the delimiter. What actually happens is there is only one token, the word I am after. I do not get the expected empty string first. This seems wrong to me. Can anyone comment please? Here is the (simplified) code: boost::char_separator<char> emSeparator("M"); boost_tokenizer emTokenizer(line, emSeparator); boost_tokenizer::const_iterator it2 = emTokenizer.begin(); std::cout << "first token = [" << *it2 << "]" << std::endl; I am using boost version 1.42.0 on Windows-XP SP3, compiling with VS 2005 (aka vc8). Regards, Andrew Marlow ___________________________________________________________ This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited. Please refer to http://www.bnpparibas.co.uk/en/information/legal_information.asp?Code=ECAS-… for additional disclosures.

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boost.spirit.qi : how to disable semantic actions
by olivier musse 17 Jun '10

17 Jun '10

Hi All, I'am using spirit::qi for developping a parser. Thanks boost for this great job. My issue is that I would like to test the syntax of my grammar before performing semantic actions. Is these any way to do that, I mean parse a string without performing the defined semantic actions ? Thanks in advance for any help Oli

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Re: [Boost-users] Connect holes in polygon (Barend Gehrels)
by Macumber, Daniel 17 Jun '10

17 Jun '10

Hi Barend, thanks for the reply. As I understand it the algorithm is not that simple but I would be happy to find out I am wrong. The requirements I have are that the "seams" cannot cut through any holes, the connect_holes algorithm does prevent seams crossing holes this but may have to create new vertices for seam "take-offs" to travel to other holes. I have tried using the QPolygon class in Qt, it has an simple implementation that just iterates around all the holes but can lead to seams crossing holes (or seams going out of the boundary of the outer polygon). Do you think an easy solution exists given these requirements? Dan -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of boost-users-request(a)lists.boost.org Sent: Wednesday, June 16, 2010 9:45 AM To: boost-users(a)lists.boost.org Subject: Boost-users Digest, Vol 2392, Issue 2 Send Boost-users mailing list submissions to boost-users(a)lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. Connect holes in polygon (Macumber, Daniel) 2. Re: config / cygwin question (Steven Watanabe) 3. Re: boost.xpressive: using placeholders with custom (check()) assertions (Eric Niebler) 4. Re: Connect holes in polygon (Barend Gehrels) 5. Re: [boost] [log] Link error with trivial logging (Roger Stewart) 6. Re: config / cygwin question (Fr?d?ric Bron) 7. Re: [Serialization] Sometimes Fails Reading Binary File (Robert McCullough) 8. Re: [Serialization] Sometimes Fails Reading Binary File (Steven Watanabe) 9. Re: [Serialization] Sometimes Fails Reading Binary File (Robert McCullough) ---------------------------------------------------------------------- Message: 1 Date: Wed, 16 Jun 2010 06:07:15 -0600 From: "Macumber, Daniel" <Daniel.Macumber(a)nrel.gov> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: [Boost-users] Connect holes in polygon Message-ID: <07186B30C3DFE948B0EE2862AC1999F70A5B89E426(a)MAILBOX2.nrel.gov> Content-Type: text/plain; charset="us-ascii" Does anyone know how to use boost Polygon or boost GGL to take a convert a polygon with holes to a polygon with no holes? I am looking for functionality similar to this http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Boolean_set_operations_…. I have already found a way to extract trapezoids using boost Polygon but I was hoping there was a method more similar to connect_holes. Thanks a lot, Dan ------------------------------ Message: 2 Date: Wed, 16 Jun 2010 06:22:02 -0700 From: Steven Watanabe <watanabesj(a)gmail.com> To: boost-users(a)lists.boost.org Cc: Rene Rivera <grafikrobot(a)gmail.com> Subject: Re: [Boost-users] config / cygwin question Message-ID: <4C18CFFA.7010902(a)providere-consulting.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed AMDG Fr?d?ric Bron wrote: > # Uploading log archive > "/cygdrive/d/boost_regression/cygwin/results/bronf-cygwin-1.7.zip" to > ftp://anonymous@boost.cowic.de/boost/do-not-publish-this-url/results//trunk > Rene, I think you're going to have to change this again. In Christ, Steven Watanabe ------------------------------ Message: 3 Date: Wed, 16 Jun 2010 09:29:38 -0400 From: Eric Niebler <eric(a)boostpro.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] boost.xpressive: using placeholders with custom (check()) assertions Message-ID: <4C18D1C2.6010208(a)boostpro.com> Content-Type: text/plain; charset=ISO-8859-1 On 6/16/2010 3:04 AM, Alex Dubov wrote: > Greetings. > > Xpressive allows the use of object placeholders in semantic actions, > which are being replaced by actual object references during the > match, like in this simple example: > > placeholder<string> p_string; sregex r = > (expr)[do_something(p_string, _)]; > > When executed, do_something() functor will receive a reference to > string, as expected. > > However, if functor is wrapped with assertion, this won't work: > > sregex r = (expr)[check(do_something(p_string, _))]; > > Compilation will fail, because do_something has no method which > accepts xpressive::placeholder<> objects. It should if it is a lazy function. How is do_something defined? Can you send a self-contained program that demonstrates the problem you're having? > And even if such method was > to be added, there's no obvious way to obtain a run-time reference to > actual object out of placeholder. xpressive will do that for you. > This leads to some question: 1. Is there any trick allowing to use > placeholders within check() assertions? 2. Alternatively, may there > be a way to declare a semantic action functor, returning bool, in > such a way, that it will act as custom assertion? It seems to me, > that some cunning trick involving boost::proto construct may exist, > even though I can't think of any particular way to do so. > > In light of the above, I also thought about sort of feature request: > 3. Sometimes, custom assertion applies only to a part of the match, > something like: > > *((expr)[check(cond)] | _) > > That is, a desire is to consume everything, until some specific > "expr" token matches a precondition. Yes, that should work. > However, raised assertion will > not stop the matching, because it only applies to one branch of the > regexp. It could be very handy if there was a way to signal from > assertion that a larger containing expression matched it results. I don't understand that last sentence. Can you clarify? -- Eric Niebler BoostPro Computing http://www.boostpro.com ------------------------------ Message: 4 Date: Wed, 16 Jun 2010 15:59:12 +0200 From: Barend Gehrels <barend(a)geodan.nl> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Connect holes in polygon Message-ID: <4C18D8B0.7060902(a)geodan.nl> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Hi Dan, Macumber, Daniel wrote: > Does anyone know how to use boost Polygon or boost GGL to take a convert a polygon with holes to a polygon with no holes? I am looking for functionality similar to this http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Boolean_set_operations_…. I have already found a way to extract trapezoids using boost Polygon but I was hoping there was a method more similar to connect_holes. > As also described on the GGL-mailing list: > No, Boost.Geometry does not (yet) provide conversion from polygons > with holes to so-called key-holed polygons as you describe. Normally > this is necessary or useful for graphic user interfaces. The algorithm > is not that difficult, visiting the outer polygon and after that the > inner rings, while pushing the first point of the outer polygon > between all inner rings, is normally enough. This can be done by > normal iterators. Regards, Barend ------------------------------ Message: 5 Date: Wed, 16 Jun 2010 10:00:20 -0400 From: "Roger Stewart" <rstewart(a)noregon.com> To: <boost-users(a)lists.boost.org> Subject: Re: [Boost-users] [boost] [log] Link error with trivial logging Message-ID: <A9BF6EA2DF78AB47A87CC2A0F55437FA014A4831(a)mail2003.noregon.com> Content-Type: text/plain; charset="utf-8" > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org [mailto:boost-users- > bounces(a)lists.boost.org] On Behalf Of Igor R > Sent: Wednesday, June 16, 2010 3:56 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] [boost] [log] Link error with trivial > logging > > > libboost_log-vc80-mt-sgd-1_43.lib(trivial.obj) : error LNK2019: > > unresolved external symbol "class boost::system::error_category const > > & __cdecl boost::system::get_system_category(void)" > > (?get_system_category@system@boost@@YAABVerror_category@12@XZ) > > referenced in function "void __cdecl boost::system::`dynamic > > initializer for 'system_category''(void)" > > (??__Esystem_category@system@boost@@YAXXZ) > > > > Any thoughts on what might be causing this? ?Below is my main(). > ?Thanks! > > Do you have libboost_system-vc80-mt-sgd-1_43.lib ? > This lib should be linked as well. > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users I am using msvc90 with boost 1.43 and receive the same linking errors when compiling a simple trivial console project. I can get the project to link successfully if I include a backend sink, i.e.: #include <boost/log/sinks/text_file_backend.hpp> This bug can be verified by declaring #define BOOST_LIB_DIAGNOSTIC and watching which libs get pulled in for linking when including or commenting out text_file_backend.hpp. Roger S. ------------------------------ Message: 6 Date: Wed, 16 Jun 2010 16:37:57 +0200 From: Fr?d?ric Bron <frederic.bron(a)m4x.org> To: boost-users(a)lists.boost.org Cc: Rene Rivera <grafikrobot(a)gmail.com> Subject: Re: [Boost-users] config / cygwin question Message-ID: <AANLkTinaBs96oAkTOtfqmBoUpQJlfce3XnOKbSsFnkvK(a)mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" >> # Uploading log archive >> "/cygdrive/d/boost_regression/cygwin/results/bronf-cygwin-1.7.zip" to >> >> ftp://anonymous@... > > Rene, I think you're going to have to change this again. Oh! I am terribly sorry for this mistake. May I propose the attached patch so that this will never happen again. Regards, Fr?d?ric

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flags for VS2010 project when using boost
by Jogeshwar Karthik Akundi 17 Jun '10

17 Jun '10

Hi, I am a newbie to boost and I am trying to develop an application which uses boost thread/mutex/condition/date-time classes. I now get crashes in boost::detail::basic_timed_mutex::unlock. What I suspect at this point of time is that my project settings may be wrong. Can somebody please tell me the right configuration flags etc to use when compiling an application using boost on Windows XP VS 2010. Cheers AJ

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compile errors with boost::bind
by Nathan Ridge 17 Jun '10

17 Jun '10

Hello, I'm getting some compiler errors with boost::bind that I'm not able to figure out. I was able to reduce it to the following minimal example: #include <boost/bind.hpp> using boost::bind; template <typename RawProc> void AdapterProc(RawProc proc) { // do other stuff, then call proc() } template <typename RawProc> void f(RawProc proc) { bind(&AdapterProc<RawProc>, proc)(); } void RawProc(int x); int main() { f(bind(&RawProc, 0)); } The compiler errors with gcc 4.4 are the following: In file included from /usr/include/boost/bind.hpp:22, from test.cpp:1: /usr/include/boost/bind/bind.hpp: In member function ‘void boost::_bi::list1< boost::_bi::bind_t< void, void (*)(int), boost::_bi::list1<boost::_bi::value<int> > > > ::operator()( boost::_bi::type<void>, void (*)( boost::_bi::bind_t< void, void (*)(int), boost::_bi::list1<boost::_bi::value< int>>>)&, boost::_bi::list0 &, int)’: /usr/include/boost/bind/bind_template.hpp:20: instantiated from ‘boost::_bi ::result_traits< void, void (*)( boost::_bi::bind_t< void, void (*)(int), boost::_bi::list1<boost::_bi::value< int>>>) >::type boost::_bi::bind_t< void, void (*)( boost::_bi::bind_t< void, void (*)(int), boost::_bi::list1<boost::_bi::value< int>>>), boost::_bi::list1< boost::_bi::bind_t< void, void (*)(int), boost::_bi::list1<boost::_bi::value<int> > > > >::operator()()’ test.cpp:14: instantiated from ‘void f( boost::_bi::bind_t< void, void (*)(int), boost::_bi::list1<boost::_bi::value<int>>>)’ test.cpp:21: instantiated from here /usr/include/boost/bind/bind.hpp:246: error: conversion from ‘void’ to non- scalar type ‘boost::_bi::bind_t< void, void (*)(int), boost::_bi::list1<boost::_bi::value<int>>>’ requested I noticed that if I modify the global RawProc to take no arguments so that I don't need another bind() call in main() (I can just pass &RawProc to f() directly), it works fine. Could someone explain what I'm doing wrong? On a more general note, does anyone have some tips on how to interpret error messages like this from boost? It seems to me that without reading through the sources and understanding how the libraries are implemented, figuring out the cause of these errors is next to impossible... Thanks, Nate. _________________________________________________________________ Game on: Challenge friends to great games on Messenger http://go.microsoft.com/?linkid=9734387

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Applying mpl::transform to an mpl::string
by Pedro d'Aquino 16 Jun '10

16 Jun '10

Hi, I'm trying to apply a transformation to an mpl::string, but can't get it to compile. I'm using MS VC++2010 and Boost 1.43.0. The code: #include <boost/mpl/string.hpp> #include <boost/mpl/vector_c.hpp> #include <boost/mpl/transform.hpp> #include <boost/mpl/plus.hpp> #include <boost/mpl/arithmetic.hpp> using namespace boost; int main() { // this compiles OK typedef mpl::vector_c<int, 'abcd', 'efgh'> numbers; typedef mpl::transform<numbers, mpl::plus<mpl::_1, mpl::int_<1> > >::type result_numbers; // this doesn't (error C2039: 'value' : is not a member of 'boost::mpl::has_push_back_arg') typedef mpl::string<'abcd', 'efgh'> chars; typedef mpl::transform<chars, mpl::plus<mpl::_1, mpl::int_<1> > >::type result_chars; } I've posted the full error message at http://paste.ubuntu.com/447759/. Am I doing something wrong? Thanks, Pedro d'Aquino

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Re: [Boost-users] [boost] [log] Link error with trivial
by Joey Mink 16 Jun '10

16 Jun '10

> -----Original Message----- > From: boost-users-bounces_at_[hidden] [mailto:boost-users- > bounces_at_[hidden]] On Behalf Of Igor R > Sent: Wednesday, June 16, 2010 3:56 AM > To: boost-users_at_[hidden] > Subject: Re: [Boost-users] [boost] [log] Link error with trivial > logging > > > libboost_log-vc80-mt-sgd-1_43.lib(trivial.obj) : error LNK2019: > > unresolved external symbol "class boost::system::error_category const > > & __cdecl boost::system::get_system_category(void)" > > (?get_system_category_at_system@boost@@YAABVerror_category_at_12@XZ) > > referenced in function "void __cdecl boost::system::`dynamic > > initializer for 'system_category''(void)" > > (??__Esystem_category_at_system@boost@@YAXXZ) > > > > Any thoughts on what might be causing this? Â Below is my main(). > Â Thanks! > > Do you have libboost_system-vc80-mt-sgd-1_43.lib ? > This lib should be linked as well. Igor - thanks for the reply - yes, I did have that library available. I am using msvc90 with boost 1.43 and receive the same linking errors when > compiling a simple trivial console project. I can get the project to link successfully if I include a backend sink, > i.e.: #include <boost/log/sinks/text_file_backend.hpp> > This bug can be verified by declaring #define BOOST_LIB_DIAGNOSTIC and > watching which libs get pulled in for linking when including or commenting > out text_file_backend.hpp. > Roger S. Roger - thanks for the reply and suggestion. I included a backend sink as you mentioned and my linking issue was no more! Joey

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[date time] using date_facet to output to a stream once
by Steve Lorimer 16 Jun '10

16 Jun '10

Hi I have a an object which contains a ptime and an int mask. The mask tells me that regardless of the value stored inside the ptime object, I should display the ptime as such. If you look at the code below (set_fmt function), I set the format of a date_facet object according to some bitmasks. I now want to use this date_facet together with my ptime to output the ptime value to an outputstream? I don't want it to change the outputstream's settings for ALL ptime values, just for this single instance All the examples use a date_facet allocated on the heap, and use std::cout.imbue(...), whereas I'm looking for functionality similar to strftime... is this possible? eg: class expiration { enum expiry_mask { expiry_null = 0x00, expiry_year = 0x01, expiry_month = 0x02, expiry_day = 0x04, expiry_hour = 0x08, expiry_minute = 0x10, expiry_second = 0x20, expiry_date = 0x07, // yyyy/mm/dd expiry_time = 0x38, // hh:nn:ss expiry_all = 0x3f // yyyy/mm/dd hh:nn:ss }; boost::posix_time::ptime desig; int32_t desig_mask; boost::gregorian::date_facet fmt; public: void expiration::set_fmt(const int32_t mask) { switch(mask & expiry_date) *// strip off time part of mask* { case expiry_null: fmt.format(""); break; case expiry_year | expiry_month | expiry_day: *// display as "**dd Mmm yy"* fmt.format("%d %b %y"); break; case expiry_year | expiry_month: *// display as **"Mmm yy"* fmt.format("%b %y"); break; case expiry_year: *// display as "**yy"* fmt.format("%y"); break; default: break; } } ... some other stuff here ... }; Thanks Steve

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read floats from serial (polhemus fastrak)
by Jubei 16 Jun '10

16 Jun '10

Hello. I have been trying to read some floats off a polhemus tracker for a good week now. I'm just about ready to give up. I would really really appreciate any help in solving this as it has consumed an entire week of my life :) An example of the floats I'm trying to read are displayed in this image. It's the data that I see when I open a terminal to it. http://www.rci.kutc.kansai-u.ac.jp/problem.png Based on an example i found on the net I put together a class as such: *class minicom_client * *{ * *public: * * minicom_client(boost::asio::io_service& io_service, unsigned int baud, const std::string& device, EventQueue* queue) * * : serialPort(io_service, device), eventQueue(queue) * * { * * **if (!serialPort.is_open()) * * { * * MessageBox(NULL,"Serial Port","Failed to open",MB_OK);* * return; * * } * * boost::asio::serial_port_base::baud_rate baud_option(baud); * * serialPort.set_option(baud_option);* * * * **std::string msg = "fC"; **//command to get the tracker to start sending us binary output continuously* * * * **boost::asio::write(serialPort,boost::asio::buffer(msg.c_str(),msg.size())); *//send the command * * * ** *//start reading for input * **serialPort.async_read_some(boost::asio::buffer(buffer, max_read_length), boost::bind(&minicom_client::read_complete, * * this, * * boost::asio::placeholders::error, * * boost::asio::placeholders::bytes_transferred)); * * * * } * * * *private:* * **void read_complete(const boost::system::error_code& error, size_t bytes_transferred) * * **{** * * **boost::array<float, 7> topush;* * * * **for (int i=0;i<7;i++) {* * **topush[i] = reverse(getFloat(i)); //already tried with ntohl()* * * * **}** * * * * * * **boost::mutex::scoped_lock lock(io_mutex);* * *//event queue is a <dequeue> that we push the data in (the ui thread reads the data off that queue) * **eventQueue->push(topush); * * **lock.unlock();* * * * //go back to waiting for data* * **serialPort.async_read_some(boost::asio::buffer(buffer, max_read_length), boost::bind(&minicom_client::read_complete, * * **this, * * **boost::asio::placeholders::error, * * **boost::asio::placeholders::bytes_transferred)); * * **}* * * * **float getFloat(int index) **//extract floats from the buffer by memcpying them to floats. Function tested and works fine* * **{* * **float temp = 0.0;** * * * * **memcpy(&temp,buffer+3*sizeof(char)+index*sizeof(float),sizeof(float));* * **return temp;* * * * **}* * * * **float reverse( float const& x ) ** **//reverse the bytes* * **{* * **float res;* * * * **char* pres = (char*)(&res);* * **char const* px = (char const*)(&x);* * * * **std::reverse_copy(px,px+sizeof(float),pres);* * * * **return res;* * **}* * * * **// maximum amount of data to read in one operation 2 ascii, 1 space and 7 4-byte floats * * **static const int max_read_length = 7*4+3;* * * * **boost::asio::serial_port serialPort; **// the serial port this instance is connected to** * * **unsigned char buffer[max_read_length]; **// data read from the socket * * **EventQueue* eventQueue;* *};* then on my main() i do: * * * * *boost::asio::io_service io_service;* *boost::asio::io_service::work work(io_service);* *try {* * **minicom_client c(io_service, 115200, "COM4",queuePointer); * * **io_service.run();* *}* *catch (std::exception& e)* *{* * **MessageBox(NULL,e.what(),"You Buffoon SERIAL error",MB_OK);* *}* But the floats on the output become unreadable (like -541.3414e-035). Any help would be appreciated. Thanks in advance, Jubei

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