April 2012 - Boost-users - lists.preview.boost.org

[regex] fails to work with ICU
by valery O 07 Apr '12

07 Apr '12

Hi, I cannot make boost :: regex and ICU work together. I installed icu4c 4_8_1_1 in /usr/local, then boost_1_49_0 libraries, in /usr/local/boost. I used bjam with "-sHAVE_ICU=1". It built successfully with a message "-has_icu builds: yes". So it means boost libraries found icu, and can use it. But it wouldn't. If I add header #include"boost/regex/icu.hpp" to file main.cpp ( In Xcode ) and compile, I receive 451 errors beginning with: > >> /usr/local/boost_1_49_0/boost/regex/icu.hpp:22:28: error: >> unicode/utypes.h: No such file or directory > > /usr/local/boost_1_49_0/boost/regex/icu.hpp:23:27: error: unicode/uchar.h: >> No such file or directory > > /usr/local/boost_1_49_0/boost/regex/icu.hpp:24:26: error: unicode/coll.h: >> No such file or directory > > In file included from >> /Users/spaset/Documents/Myprograms/MarcoPolo77OLD/main.cpp:10: > > /usr/local/boost_1_49_0/boost/regex/icu.hpp:44: error: 'UChar32' does not >> name a type > > /usr/local/boost_1_49_0/boost/regex/icu.hpp:46: error: 'char_type' was not >> declared in this scope > > /usr/local/boost_1_49_0/boost/regex/icu.hpp:46: error: template argument 1 >> is invalid > > > If I open file /usr/local/boost_1_49_0/boost/regex/icu.hpp I got the similar messages: > unicode/utypes.h: No such file or directory > > unicode/uchar.h: No such file or directory > > unicode/coll.h: No such file or directory > > > So /usr/local/boost_1_49_0/boost/regex/icu.hpp does not see unicode > headers > in /usr/local/include/unicode, even though bjam says "- has_icu builds: > yes". > Can someone tell me what is wrong? > Thanks a lot for help! > > My details: > Mac OSX 10.6.8 > IDE - Xcode 3.2 > > egersheldster. > >

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Cray C++ compiler errors
by Nico Schlömer 07 Apr '12

07 Apr '12

Hi all, has anyone succeeded in compiling Boost with the Cray C++ compiler? I'm using Boost 1.47.0 and get error messages of the type ====================== *snip* ====================== CC-439 crayc++: ERROR File = /usr/common/usg/boost/1.47.0/include/boost/type_traits/is_rvalue_reference.hpp, Line = 21 A greater-than character (">") is expected. BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_rvalue_reference,T&&,true) ^ ====================== *snap* ====================== and ====================== *snip* ====================== CC-40 crayc++: ERROR File = /usr/common/usg/boost/1.47.0/include/boost/type_traits/add_rvalue_reference.hpp, Line = 46 An identifier is expected. typedef T&& type; ^ ====================== *snap* ====================== All hints appreciated. Cheers, Nico

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[preprocessor] having trouble using reentrant macros
by Rob Desbois 07 Apr '12

07 Apr '12

I'm unable to use the reentrant macros for iteration currently..I think I'm probably misunderstanding their usage, and a push in the right direction would be much appreciated. My need is to iterate through a sequence, then iterate through a sequence nested within each element. As I understand, I should be able to call (e.g.): * BOOST_PP_SEQ_FOR_EACH(OP, data, seq) to iterate through the outer sequence * then in OP(r, data, elem) call BOOST_PP_SEQ_FOR_EACH_R(r, OP2, data, elem) For me this keeps producing rubbish with a lot of non-expanded macro names embedded. I've reduced this down to a minimal example iterating over a 2-dimensional sequence; I know the final line isn't valid C++, I'm just checking preprocessing results at this stage. #include <boost/preprocessor/seq/transform.hpp> #define INNER(s, data, elem) <elem> #define MIDDLE(s, data, seq) BOOST_PP_SEQ_TRANSFORM_S(s, INNER, data, seq) #define OUTER(seqseq) BOOST_PP_SEQ_TRANSFORM( MIDDLE, _, seqseq) outer gives: OUTER( ((a) (b) (c)) ((i) (j) (k)) ((x) (y) (z)) ) Resultant output of this, with preprocessor line directives and empty lines removed, is: outer gives: ( BOOST_PP_SEQ_TAIL_I BOOST_PP_TUPLE_ELEM_3_2 BOOST_PP_SEQ_TRANSFORM_O(5, BOOST_PP_SEQ_TRANSFORM_O(4, BOOST_PP_SEQ_TRANSFORM_O(3, ( INNER , _, (nil)), a), b), c)) ( BOOST_PP_SEQ_TAIL_I BOOST_PP_TUPLE_ELEM_3_2 BOOST_PP_SEQ_TRANSFORM_O(6, BOOST_PP_SEQ_TRANSFORM_O(5, BOOST_PP_SEQ_TRANSFORM_O(4, ( INNER , _, (nil)), i), j), k)) ( BOOST_PP_SEQ_TAIL_I BOOST_PP_TUPLE_ELEM_3_2 BOOST_PP_SEQ_TRANSFORM_O(7, BOOST_PP_SEQ_TRANSFORM_O(6, BOOST_PP_SEQ_TRANSFORM_O(5, ( INNER , _, (nil)), x), y), z)) For reference, I am using the following: boost 1.46.00 g++ (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2) TIA --rob

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[MSM] multiple visitors / signatures, and visitors by ref in submachines
by Albert Gil Moreno 06 Apr '12

06 Apr '12

Hi, I think that the visitors and the flags ideas of the MSM are very generic and easy to use. So, great! But, there is a way to define multiple visitors for a single state (base)? I think that it is not possible because the visitors mechanism is based on a "simple/single typedef" and not on an "listed typedef"... isn't it? So, why the visitors are not like flags? I mean, why not to use an "accept_sig_list" instead of a single "accept_sig"? Why is not possible a code like the following: struct my_visitable_state { typedef mpl::vector< args<void, VisitorType1&>, args<void, VisitorType2&> > accept_sig_list; void accept(VisitorType1&) const {} void accept(VisitorType2&) const {} }; By the way... I think that the usage of boost::ref() is not propagated to the submachines...? I've found that when my state machine is also in a submachine, the visitor of the state machine is passed by reference, but the submachine is passed always by value... is this a bug? (just using a pointer solved my needs, so just to report...) Thanks, Albert

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[MSM] state transitions and exceptions
by Stephan Menzel 06 Apr '12

06 Apr '12

Everyone, I did just get around to give the MSM a first shot and I have say I am impressed at the neat design, the ease of use, "understandability", tutorial ... exceptional work. Really great and it helped me a great deal so far. So thanks a bunch for this teriffic addition to boost. That's the kind of stuff I love boost for. There is one question however that puzzles me. How can / do I prevent state transistions when a transition function throws? Most transition functions are defined like that: void so_transition(event::Cause const &e) { methodCausingAnException(); } The tutorial only mentions this at the very end of the back-end docs and this is not clear to me. I have stuff inside my transitions that may throw and the example text mentiones other valid examples (like connect() logic). So what am I supposed to do here? This? void so_transition(event::Cause const &e) { try { methodCausingAnException(); } catch (const std::exception &sex) { return ??? } } The type is void and I can't return anything that would prevent the transition. Or should I just let the exception pass? What is the correct way? Suggestions are appreciated, Stephan

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[graph] Problem with vertex initialization in boost::add_vertex()
by Philipp Klaus Krause 06 Apr '12

06 Apr '12

I have graph as follows: struct cfg_node { iCode *ic; operand_map_t operands; std::set<var_t> alive; std::set<var_t> dying; }; typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, cfg_node> cfg_t; And a fragment of code: wassertl (!boost::num_vertices(cfg), "CFG non-empty before creation."); for (ic = start_ic, i = 0, j = 0; ic; ic = ic->next, i++) { boost::add_vertex(cfg); wassertl (cfg[i].alive.empty(), "Alive set non-empty upon creation."); Nothing inside the loop add or deletes vertices or changes the alive members. The code works fine on Linux, but I got bug reports from Windows users. For them the assertion in the loop triggers (and an attempt to insert something into alive later segfaults). So I have two questions: What could be the cause of this problem? Has it been encountered before? Is the approach of using cfg[i] to get the vertex still correct? I've used this for some time, but I can't find it in current boost documentation. Philipp

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Asio SSL & short read error
by Jason Nye 05 Apr '12

05 Apr '12

Hi all, I've run into a strange problem with reading data using an SSL socket stream (client-side). The code we've got essentially does the following on each read: system::error_code ec; auto result = _source->read_some(buffer(buf, n), ec); // buf and n are defined as char* and size_t. // here is where the occasional strangeness occurs. I understand that during any streaming operation may return fewer bytes than requested - this is something we handle gracefully. However occasionally after read_some() above, we may get 0 bytes read and ec set to an internal ssl error code indicating a "short read". My understanding is that this particular error is benign and the software should just continue to try reading. In fact, when I change our code to deal with this error specifically and just continue reading, everything works nicely. The part I don't feel comfortable with is that it doesn't seem clear at all how to differentiate this particular error from a potentially fatal error other than comparing the error code's lower 8 bits against SSL_R_SHORT_READ (which I found by browsing the asio code and it is an OpenSSL constant). There doesn't seem to be any publicly facing constant that helps determine this situation. Here is the basic logic for how we handle this specifically (which I do not like at all because it puts SSL-specific error handling logic where it doesn't belong): // Loosely C++ code: if (result == 0) { if (EOF) { // Okay, end of the stream } else if (ec) { if ((ec.value() & 0xff) == SSL_R_SHORT_READ) { // Not a big deal - just retry the operation. } else { // Throw! } } } One other thing of interest is that the client-side code is using asio in a rather synchronous manner. I am not sure if this problem arises when using asio asynchronously. Is this the only way to handle this situation reliably? Did I miss something obvious? Thanks in advance, Jason. ______________________________________________________________________________________________ [cid:image003.png@01CD1352.4ED8A7C0] Jason Nye | Principal Software Engineer 5850 Opus Parkway, Suite 300 l Minnetonka, MN 55343 952.487.9693 l 866.433.4624 l www.vitalimages.com<http://www.vitalimages.com/> A Toshiba Medical Systems Group Company ______________________________________________________________________________________________

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Boost Library : Resource Requirements
by Santhosh Edukulla 05 Apr '12

05 Apr '12

Hi Users, We are first time users of Boost. As such our production environment is already constrained with resources, iam basically trying to collect few metrics for boost packages installation and usage sizing requirements. I learnt that it depends upon specific libraries we select. But, with all your usage and experience, any data ( quantified) to be shared with is really appreciated! Thanks in Advance! Santhosh

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Question regarding library testing system
by Robert Ramey 05 Apr '12

05 Apr '12

a) http://www.boost.org/development/running_regression_tests.html tells me how to run the test suite on ALL the libraries locally. How do I run the test suite on ONE particular library locally? b) I noticed that on the test page for the serialization library there are a number of boxes in dark green indicating - expected failures. I remember that there was a procedure for specifying expected failures but now I can't find it. Could someone point me to the relevant page? Robert Ramey

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[Asio] How to link library in Qt creator
by vahid r 05 Apr '12

05 Apr '12

Hello . I want to include boost.asio in my project created in Qt creator . what should I insert to my .pro file ? Qt 4.7.4(32 bit) - Qt Creator 2.3.0 - MinGW 4.4 boost 1.49.0 platform : Windows 7

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