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

list all boost tests
by Martin Ankerl 25 Feb '10

25 Feb '10

Hi all, we are using BOOST_AUTO_TEST_SUITE() and BOOST_AUTO_TEST_CASE() to create lots of tests. Is it possible to list all the tests available in an executable? I have tried to create a special test "help" that calls boost::unit_test::traverse_test_tree(), but this only shows the tests that are selected for this test run. Martin

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Re: [Boost-users] [serialization] Polymorphic serialization withpolymorphic archives problem...
by Bogdan 25 Feb '10

25 Feb '10

Robert Ramey <ramey <at> rrsd.com> writes: > > Martin Lederhilger wrote: > > Hello Robert, hello Bogdan, > > > > I have quite the same problem (Exception multiple_code_instantiation > > thrown in basic_serializer_map.cpp at line 48) as Bogdan. It can be > > reproduced by changing > > the pointer type from polymorphic_base to polymorphic_derived2 in the > > original test_dll_exported.cpp example, which comes with the library. > > I think the problem is that when oa << BOOST_SERIALIZATION_NVP(rb2); > > is called, that the system registers an type in oserializer.hpp, which > > leads to creation of the singletons also in the executeable. > > Ahhhh - a very useful hint. So the rule would be that if a class > is polymorphic is to be serialized through a pointer, it should ONLY > be done through a base class pointer? That is, if ALL polymorphic > base classes are abstract - this problem will never occur? > > I'll have to think about this. > > > I have this problem when serializing a shared_ptr<A> in class B in > > B.dll to an object of class A in A.dll. > > > > I tried to simply comment out this check, but it seems that I get > > problems with tracking later. I have a class hierarchy like this: > > C derives from B derives from A. A has a weak_ptr<A> to itself > > (something like boost::enable_shared_from_this). If I serialize an > > object of type C via a base pointer of type B the serialization walks > > like this: C::serialize, B::serialize, A::serialize, and again > > C::serialize (with a wrong this pointer - and it should not do that). > > Hmmm - why should it not do that? You may have a cycle - but > the library handles that. Seems unrelated to the other problem. > > > Maybe my second problem depends on the first one. I hope that my > > report can be of help. > > > > Thanks in advance for your answers, > > And thanks for your useful information. > > > Martin Lederhilger > Hello Robert, On your suggestion I have run a few tests. I hope they help: I commented out the registration macro associated to the base class in ExportDll.dll: - //BOOST_CLASS_EXPORT_IMPLEMENT(polymorphic_base) To make the example more realistic I modified the inheritance hierarchy as follows: class polymorphic_base{}; class polymorphic_derived1 : public polymorphic_base{}; class polymorphic_derived2 : public polymorphic_derived1{}; I added one integer data member to polymorphic_derived1 and polymorphic_derived2. Here are the results: ================================================== Polymorphic serialization through a pointer to polymorphic_base WORKS AS EXPECTED: // Save code ----------------------------- polymorphic_base *rb0 = new polymorphic_derived1(100); polymorphic_base *rb1 = new polymorphic_derived1(10); polymorphic_base *rb2 = new polymorphic_derived2(10,20); oa << BOOST_SERIALIZATION_NVP(rb0); oa << BOOST_SERIALIZATION_NVP(rb1); oa << BOOST_SERIALIZATION_NVP(rb2); // Load code ----------------------------- polymorphic_base *rb0 = NULL; polymorphic_base *rb1 = NULL; polymorphic_base *rb2 = NULL; ia >> BOOST_SERIALIZATION_NVP(rb0); ia >> BOOST_SERIALIZATION_NVP(rb1); ia >> BOOST_SERIALIZATION_NVP(rb2); The serialized content is presented below: - for polymorphic_xml_[io]archive <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <!DOCTYPE boost_serialization> <boost_serialization signature="serialization::archive" version="7"> <rb0 class_id="1" class_name="polymorphic_derived1" tracking_level="1" version="0" object_id="_0"> <polymorphic_base class_id="0" tracking_level="0" version="0"></polymorphic_base> <m_d1_>100</m_d1_> </rb0> <rb1 class_id_reference="1" object_id="_1"> <polymorphic_base></polymorphic_base> <m_d1_>10</m_d1_> </rb1> <rb2 class_id="2" class_name="polymorphic_derived2" tracking_level="1" version="0" object_id="_2"> <polymorphic_derived1 object_id="_3"> <polymorphic_base></polymorphic_base> <m_d1_>20</m_d1_> </polymorphic_derived1> <m_d2_>10</m_d2_> </rb2> </boost_serialization> - for polymorphic_text_[io]archive 22 serialization::archive 7 1 20 polymorphic_derived1 1 0 0 0 0 100 1 1 10 2 20 polymorphic_derived2 1 0 2 3 20 10 ================================================== Polymorphic serialization through a pointer to polymorphic_derived1 (i.e. the class in the middle of the hierarchy) FAILS WITH THE SAME EXCEPTION thrown about multiple registration (see the beginning of this thread). ================================================== What is worrisome though, isomorphic serialization of polymorphic_derived1 as an object followed by polymorphic serialization through a pointer to the base class FAILS WITH ACCESS VIOLATION: // Save code ----------------------------- polymorphic_derived1 rb0(100); polymorphic_base *rb1 = new polymorphic_derived1(10); polymorphic_base *rb2 = new polymorphic_derived2(10,20); oa << BOOST_SERIALIZATION_NVP(rb0); oa << BOOST_SERIALIZATION_NVP(rb1); oa << BOOST_SERIALIZATION_NVP(rb2); // Load code ----------------------------- polymorphic_derived1 rb0; polymorphic_base *rb1 = NULL; polymorphic_base *rb2 = NULL; ia >> BOOST_SERIALIZATION_NVP(rb0); ia >> BOOST_SERIALIZATION_NVP(rb1); ia >> BOOST_SERIALIZATION_NVP(rb2); The code above fails in basic_iarchive.cpp(line 469) with access violation (bpis is 0). if(! tracking){ bpis_ptr->load_object_ptr(ar, t, co.file_version); } The serialized content is presented below: - using polymorphic_xml_[io]archive <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <!DOCTYPE boost_serialization> <boost_serialization signature="serialization::archive" version="7"> <rb0 class_id="0" tracking_level="0" version="0"> <polymorphic_base class_id="1" tracking_level="0" version="0"></polymorphic_base> <m_d1_>100</m_d1_> </rb0> <rb1 class_id_reference="0" object_id="_0"> <polymorphic_base></polymorphic_base> <m_d1_>10</m_d1_> </rb1> <rb2 class_id="2" class_name="polymorphic_derived2" tracking_level="1" version="0" object_id="_1"> <polymorphic_derived1 object_id="_2"> <polymorphic_base></polymorphic_base> <m_d1_>20</m_d1_> </polymorphic_derived1> <m_d2_>10</m_d2_> </rb2> </boost_serialization> - using polymorphic_text_[io]archive 22 serialization::archive 7 0 0 0 0 100 0 0 10 2 20 polymorphic_derived2 1 0 1 2 20 10 ================================================== Isomorphic serialization of a class not related to the hierarchy as an object followed by polymorphic serialization through a pointer to the base class WORKS AS EXPECTED. ================================================== I am looking forward to hearing your conclusions. Thank you, Bogdan

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boost::asio acceptor::cancel() behavior.
by Jivan Amara 25 Feb '10

25 Feb '10

Hi all, I'm looking at the documentation for acceptor::cancel(), which states that it will: "Cancel all asynchronous operations associated with the acceptor.", then in the detailed description states: "This function causes all outstanding asynchronous connect, send and receive operations to finish immediately, and the handlers for cancelled operations will be passed the |boost::asio::error::operation_aborted| error. " The wording is unclear to me. What are send and receive operations associated with the acceptor? Are these reads and writes performed using sockets that were connected through this acceptor, or just the network overhead required to perform accepts? Thanks, Jivan

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[Proto] Processing Lists
by David Greene 25 Feb '10

25 Feb '10

I want to process a list that looks something like this: struct List : or_< comma< List, Item >, Item > {}; But rather than processing each item separately, I want to pass a fusion (or some other) sequence to a semantic action: when< List, SomeAction(...) > {}; Ideally the argument to SomeAction would be a fusion sequence but I don't know how to produce one. This doesn't work: when< List, SomeAction(flatten(_)) > {}; because flatten is not a transform. I don't want to use fold_tree because I don't want to actually fold the sequence. SomeAction is something like this: struct SomeAction : callable { template<typename Seq> void operator()(Seq range) { typedef ... iterator; // Is this legal for fusion sequences? for(iterator i = begin(range), iend = end(range); i != iend; i = next(i)) { ... } } } Is there a way to do this? On a related note, I know I can use varag<> to match a function call expression with an arbitrary number of operands and invoke a transform on each operand. But how would I generate a fusion sequence of all the operands? In other words, with: proto::function< X, proto::vararg<Y> > how do I talk about the vararg<> part in a semantic action? CalculatorGrammar has a use of vararg but it uses fold<> to process it. I don't want to fold a sequence, I want to pass it to a transform. Thanks! -Dave

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Newbie Xpressive Help Needed
by Timothy Sassone 25 Feb '10

25 Feb '10

I'm new to both boost and Xpressive, but I've worked with regex before. I've been able figure most of it out from the Xpressive user guide, but I'm having some trouble with a particular expression. I'm using Xpressive to "parse" files from a game called Dwarf Fortress, and one of the lines in the file has a couple places where some information is printed in a different format, or entirely excluded. The lines are describing the history of the game, specifically the rulers. For example, one line might look like this: *[*] Flichlikus (b.??? d. 3, Reign Began: 1), *** Original Line, Married (d. 91)* While another would look like this: *[*] Thufuchrunkin (b.3, Reign Began: 97), Inherited from mother, Married (d. 160)* Thus far, I've got it finding the ruler's name, and their birth date (or "???"). However, since the date of death is sometimes completely absent, I need some way to get the number if it's there, and skip it otherwise. From what I understand, I'll need to use the lookahead or lookbehind constructs, but they're well beyond what I've done with regex before, so I don't really even know where to begin. How would I go about retrieving the date of death if it's there, and otherwise skipping it entirely (or better yet, set it to a default value...)? Here's what I'm using to parse up through the date of birth... *mark_tag RU_Name(1), RU_Birth(2), RU_Death(3), RU_ReignBegin(4), RU_Line(5), RU_Married(6);* *sregex Reg_Ruler = " [*] " >> ( RU_Name = +(+_w|_s) ) >> "(b." >> (RU_Birth = (+(_d)|"???"));* * * Any help would be much appreciated, and a link to a decent tutorial to help me with Xpressive in general would be even better. Thanks! Tim

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Re: [Boost-users] fusion struct adapted, latest trunk changes
by Hicham Mouline 25 Feb '10

25 Feb '10

-----Original Message----- From: "Hicham Mouline" [hicham(a)mouline.org] Date: 24/02/2010 10:17 AM To: boost-users(a)lists.boost.org Subject: Re: fusion struct adapted, latest trunk changes Christopher, <snip> 1. temporarily, which files should I add this tweak to (boost\fusion\adapted\struct\extension.hpp is gone) 2. I understand your changes are about adapting class/struct templates. Where should I add this tweak to if I wish to use it for adapted templates, -------------------------------------------------------------------------------- Attached are the 2 files I have changed to trunk now. It works for my non template struct case, I haven't tested yet for struct templates /classes/ class templates Regards, ps: I hope to be able to add this later for the other headers. attached: boost\fusion\adapted\struct\detail\adapt_base.hpp attached: boost\fusion\adapted\struct\detail\extension.hpp

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[iostream] exception propogation
by Anand Patel 24 Feb '10

24 Feb '10

I came across interesting exception propagation behavior across different platform (win32, linux). I have created several filters and custom filtering stream with my filters (boost 1.38-1.41). My filter throws BOOST_IOSTREAMS_FAILURE("some message"); whenever error condition occurs. On Linux exception gets propagated all the way to user using my stream. On Windows XP (VS 2008) it gets caught somewhere in boost framework or Windows. Moreover, after exception is silently caught and dropped, all the filters close method is called. This is where I run into issue. Is there anyway to ensure that upon exception no more data processing takes place withing filtering_stream and its chain? -Anand

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Xcode and Boost
by David Rangel 24 Feb '10

24 Feb '10

Boost Users: I am interested in using Xcode on OSX to develop some code, and have been having some troubles compiling the regex example given at: http://www.boost.org/doc/libs/1_35_0/more/getting_started/unix-variants.html I can compile using the command line, but not in Xcode. I do not know if this is the correct forum on which to post, but after some searching for my question on the web, I have not found a suitable answer. I am able to compile the simple first example using Xcode, by directing it to look for the header files and libraries. The same procedure does not work for the second example and the compilation fails. I am not sure if anyone is using the XCode development development environment and has run into this problem, but any hints would be appreciated. Thank you

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[GIL] Fixed version
by Eloi Du Bois 24 Feb '10

24 Feb '10

Hi all, I downloaded the last version of boost (1.42), and I saw that there still remains errors I reported before. I give you the fixed version of both incorrect files. Example of error: channel.hpp:368: warning: left shift count >= width of type I hope this will help in making a stronger version of bgil :) Good luck, Eloi Du Bois.

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boost::filesystem is not detecting symlinks on Linux /sys/devices directory
by Conrad Whelan 24 Feb '10

24 Feb '10

Hi, I'm writing some code to query the PCI bus for active devices. It should be pretty straightforward, as sysfs maps device information into the linux filesystem in the /sys directory. I simply need to recursively scan this directory until I find the device file corresponding to the devices of interest. I am having trouble with the scanning, using the boost::filesystem library. It seems that the is_symlink function on a path iterator is not correctly detecting a symlink. It correctly determines that the symlink is a directory, but not that it's a symlink. Simply put, I want my recursive code to follow normal directories, but not symlink directories... as it is, there is circular linkage through the /sys directory if I follow symlinks, so the loop goes infinite. Does anyone know how to distinguish between normal directories and symlink directories using boost::filesystem? thanks, conrad

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