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[asio] Issue with resolver query for 64-bit browsers (IE)
by Jacques, Keiko 23 Feb '12

23 Feb '12

I am writing a browser plugin which needs to get the size of a file using the HTTP HEAD request. In order to send the request I am using the boost socket and the boost::asio::ip::tcp::resolver::query to get the ip address and service port. I am basically using code from the asio sync_client sample provided with Boost 1.48.0. using boost::asio::ip::tcp; boost::asio::io_service io_service; tcp::resolver resolver(io_service); tcp::resolver::query query(hostname, "http"); tcp::resolver::iterator endpoint_iterator = resolver.resolve(query); tcp::resolver::iterator end; This works fine when I run this on a Windows platform (Windows 7) using 32-bit browsers such as Firefox, Chrome, and IE. This also works fine when I run this as a desktop application through a test driver on a Windows (Vista , Windows7)64-bit platform. However, when I run this as a browser plugin on the Windows Vista 64-bit platform using IE (64-bit) it seems to crash on the line: tcp::resolver resolver(io_service); I'm not sure if this is a Boost issue or an IE issue, so I was wondering if anyone knows of any incompatibility issues and/or limitations with Boost and IE (64-bit) which could cause this to happen. Thanks Keiko ________________________________ This e-mail and any attachments may contain confidential material for the sole use of the intended recipient. If you are not the intended recipient, please be aware that any disclosure, copying, distribution or use of this e-mail or any attachment is prohibited. If you have received this e-mail in error, please contact the sender and delete all copies. Thank you for your cooperation.

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REGEX Don't understand the matching behavior: regex_search vs. regex_match
by Andy Falanga (afalanga) 23 Feb '12

23 Feb '12

Hi, I understand enough that regex_match() searches for matches based on the entire input string and apparently regex_search() allows for matches of the expression within the input string (i.e. the expression need not match the entire input string). However, I'm not understanding why the following happened: const char* pInput("Loc info: Channel 2, Target 0, Lun 0"); boost::cmatch found; boost::regex expression(".*Channel ([[:digit:]]{1,3})); // looking for the channel number only if(boost::regex_match(pInput, found, expression, boost::regex_constants::match_partial)) { std::cout << "Matched: " << std::atoi(found[1].first) << std::endl; } When using the above, with regex_match(), the match succeeded but the output string was: "Matched: 0". What?!? If the expression was matched, why did the capture group 1 contain 0? How should the expression have been made? That's what I don't understand. I've found that what I want is accomplished with altering the above thusly: const char* pInput("Loc info: Channel 2, Target 0, Lun 0"); boost::cmatch found; boost::regex expression("Channel ([[:digit:]]{1,3})); // looking for the channel number only if(boost::regex_search(pInput, found, expression)) { std::cout << "Matched: " << std::atoi(found[1].first) << std::endl; } This gives me: "Matched: 2." Which is what I'm looking for. I'd like to understand why regex_match() wasn't giving me what I wanted. Thanks everyone, Andy

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problem with interprocess queue in boost 1.39
by orialtman 23 Feb '12

23 Feb '12

Hi All! I am using boost 1.39 on windows. i have implemented a simple client server application and ran the client and server simultaneously. The client pushes request using 'send' api with no timeout. it then sleeps for 3 seconds and sends another request and so on. the server pops messages from the queue with a timeout of 1 second. it then sleeps for 1 seconds and pops again and so on. this was created to simulate a problem i have in a more complicated server which actually performs work on received items. After some random time has passed i see that the client is locked and unable to push messages. it is locked in the 'notify' function which takes place at the end of do_send method of message_queue.hpp. while it is locked there i also see that the number of waiters on the condition is 1. when i pause the server application i see that it is not inside the do_receive method and therefore there is no appearent reason for the lock to be unavailable and for the number of waiters to be 1. has anyone come across something similar? is this a known issue for 1.39 or am i using the queue in a bad form? -- View this message in context: http://boost.2283326.n4.nabble.com/problem-with-interprocess-queue-in-boost… Sent from the Boost - Users mailing list archive at Nabble.com.

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[variant] 'which' out of range assertion
by Igor R 23 Feb '12

23 Feb '12

Hello, It appears that since 1.47 Boost.Variant has a bug that can be reproduced as follows (MSVC10, Debug mode): #include <boost/variant.hpp> #include <boost/mpl/vector/vector30.hpp> struct struct1{}; struct struct2{}; struct struct3{}; struct struct4{}; struct struct5{}; struct struct6{}; struct struct7{}; struct struct8{}; struct struct9{}; struct struct10{}; struct struct11{}; struct struct12{}; struct struct13{}; struct struct14{}; struct struct15{}; struct struct16{}; struct struct17{}; struct struct18{}; struct struct19{}; struct struct20{}; struct struct21{}; typedef boost::mpl::vector21< struct1, struct2, struct3, struct4, struct5, struct6, struct7, struct8, struct9, struct10, struct11, struct12, struct13, struct14, struct15, struct16, struct17, struct18, struct19, struct20, struct21 >::type vec_type; typedef boost::make_variant_over<vec_type>::type var_type; int main() { var_type v; v = struct21(); } The last line generates assertion in variant_impl.hpp, line 264, visitation_impl() function: "Boost.Variant internal error: 'which' out of range." According to the release notes, variant wasn't changed in 1.47, but I recalled teh following discussion: http://boost.2283326.n4.nabble.com/large-variant-performance-compared-50-el… It seems that the above issue is somehow related to this change. Igor'.

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numerical quadrature
by Dr. Bruce Elenbogen 23 Feb '12

23 Feb '12

There seems to be documentation about boost numerical quadrature, but when I download boost no such libraries exist. Where can I find the quadrature libraries? thank you Bruce

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[range] unique
by Bill Buklis 23 Feb '12

23 Feb '12

This may simply be my lack of understanding of the range library as I'm still just working my way through the algorithms, but is boost::unique returning the correct result range? Given that std::unique returns an iterator to the first non-unique value you can do something like: vec.erase( std::unique(vec.begin(), vec.end(), vec.end() ); However, boost::unique returns the range of the "unique" values. I would expect instead that it would return the range of non-unique values so that it matched the standard algorithm version, which effectively returns the range of non-unique values. Correspondingly trying: boost::erase( vec, boost::unique(vec) ); eliminates the complete opposite of what the standard version does. I can get around this by calling: vec.erase( boost::unique(vec).end(), vec.end() ); but this seems rather counter-intuitive to me. Is this correct? Is this by intent? What is the benefit of having it this way? The documentation doesn't mention anything at all about the return range in the description. Since I'm still just beginning to use the range library, I don't know all the tricks and benefits yet, so I ask. -- Bill

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Boost.Units: Issue with user-defined and unitless quantities
by Pieter 22 Feb '12

22 Feb '12

LS, This is a repost of an earlier question that unfortunately remained unanswered - I still hope sincerely someone out there can help me out as I feel really stuck here. I have some problems working with user defined quantities/units in combination with unitless quantities (such as the results of a sin() or cos() operations).Taking the example of the 'nautical mile', which is presented in the documentation: ---START CODE --- namespace nautical { struct length_base_unit : boost::units::base_unit<length_base_unit, length_dimension, 1> { static std::string name() { return "nautical mile"; } static std::string symbol() { return "nmi"; } }; typedef boost::units::make_system<length_base_unit>::type system; typedef unit<length_dimension,system> length; static const length mile,miles; } BOOST_UNITS_DEFINE_CONVERSION_FACTOR(nautical::length_base_unit, boost::units::si::meter_base_unit, double, 1.852e3); ---END CODE --- The following does not compile: ---START CODE --- typedef quantity<boost::units::si::plane_angle> TAngleInRad; typedef boost::units::quantity<nautical::length> TNauticalDistanceInNMI; TNauticalDistanceInNMI NauticalDistanceInNMI; TNauticalDistanceInNMI SumNauticalDistanceInNMI = NauticalDistanceInNMI + NauticalDistanceInNMI; // OK TNauticalDistanceInNMI ScaledSumNauticalDistanceInNMI = NauticalDistanceInNMI + NauticalDistanceInNMI*sin(AngleInRad); // Last line does not compile due to lack of a suitable operator+ ---END CODE --- It does work correctly when using the 'nautical mile' as it has been defined in the library itself in "nautical_mile.hpp" (as a scaled base unit related to the si::meter): ---START CODE --- namespace metric { typedef scaled_base_unit<boost::units::si::meter_base_unit, scale<1852, static_rational<1> > > nautical_mile_base_unit; } // definition of the nautical mile from "nautical_mile.hpp" typedef boost::units::metric::nautical_mile_base_unit::unit_type nautical_mile_unit; typedef quantity<nautical_mile_unit> TNauticalDistanceInNMI; ---END CODE --- However, I don't think I can specify my user-defined units/quantities in this manner as they use a scale factor represented by an arbitrary floating point value. My perception is that the example of the documentation does not work due to the mixing of quantities from the si system (the sin() returns a dimensionless quantity in that system) with user-defined quantities in another ('nautical') system, while the 'nautical mile' from 'nautical_mile.hpp' is a scaled version of the si::meter and thus defined within the realms of the si::system - but please correct me if I am wrong here. My problem can thus be summarized as follows: - the solution from the documentation does not compile - the solution from 'nautical_mile.hpp' uses a scaled base unit which is limited to scaling factors of the form scale<Base,Exponent> and my question is therefore: how can I define my user-defined units/quantities in such a way that they allow the required operations while being related to base units by an arbitrary scale factor? Help would be highly appreciated, Pieter ------------------- Nautical mile version #1 (from the included nautical_mile.hpp): namespace metric { typedef scaled_base_unit<boost::units::si::meter_base_unit, scale<1852, static_rational<1> > > nautical_mile_base_unit; } template<> struct base_unit_info<metric::nautical_mile_base_unit> { static const char* name() { return("nautical mile"); } static const char* symbol() { return("nmi"); } }; typedef quantity<boost::units::si::plane_angle> TAngleInRad; typedef quantity<boost::units::si::length> TDistanceInM; typedef boost::units::metric::nautical_mile_base_unit::unit_type nautical_mile_unit; typedef quantity<nautical_mile_unit> TDistanceInNMI; typedef boost::units::quantity<nautical::length> TNauticalDistanceInNMI; # this is OK: TAngleInRad Angle(0.5*radians); TDistanceInNMI DistanceInNMI; TDistanceInNMI SumDistanceInNMI = DistanceInNMI + DistanceInNMI; TDistanceInNMI ScaledSumDistanceInNMI = DistanceInNMI + DistanceInNMI*sin(AngleInRad); TNauticalDistanceInNMI NauticalDistanceInNMI; TNauticalDistanceInNMI SumNauticalDistanceInNMI = NauticalDistanceInNMI + NauticalDistanceInNMI; TNauticalDistanceInNMI ScaledSum NauticalDistanceInNMI = NauticalDistanceInNMI + NauticalDistanceInNMI*sin(AngleInRad); // DOES NOT COMPILE for lack of a suitable operator+

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[Serialization] base64 encoding/decoding an archive as it's written/read
by Sean Farrow 22 Feb '12

22 Feb '12

Hi: Is there any way of base64 encoding/decoding an archive as it is wread/written? I have found some code that encodes, but wondered whether there was already any ioStreams written. Cheers Sean.

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Acknowledgement messages
by norulez＠me.com 22 Feb '12

22 Feb '12

Hi, can anybody explain me on how to stop the "Boost-users post acknowledgement" messages after I submit a message? Thanks in advance Best Regards NoRulez

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Re: [Boost-users] undefined reference to '__sync_add_and_fetch_4'whencross-compiling boost::asio fors mips
by Jayne 22 Feb '12

22 Feb '12

Hello Andreas, Thanks for the help. I have eventually managed! In short I... - defined BOOST_ASIO_DISABLE_THREADS both while building Boost, and in the application which used it - implemented the atomic primitives using code from the gcc headers All working now! thanks, Jayne. On Fri 17/02/12 12:37 , "Andreas Wehrmann" a.wehrmann(a)centersystems.com sent: Alright, I looked into how I did when I faced the problem (my previous reply was a fast shot). I put the following #defines in the user config header (boost/config/user.hpp): #define BOOST_ASIO_DISABLE_FENCED_BLOCK #define BOOST_SP_USE_SPINLOCK This did the trick for me. From what I recall, the problem lies with shared_ptr since the implementation tries to use gcc builtins for the locking mechanism it needs for refcounting but which are not implemented on every platform (in my case it was Coldfire/m68k). Regards -- Dipl.-Ing. (FH) Andreas Wehrmann Software Development -------------------------------------------------------------- Center Communication Systems GmbH A-1210 Wien, Ignaz-Köck-Straße 19 Sitz in Wien FN 796 88p, Firmenbuchgericht Wien http://www.centersystems.com [1]">www.centersystems.com Tel.: +43 (0) 190 199 - 3616 Mobile: +43 (0) 664 884 75916 Fax: +43 (0) 190 199 - 2110 E-Mail: a.wehrmann(a)centersystems.com Links: ------ [1] http://www.centersystems.com

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