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[msm] EUML and State construction
by Nate Knight 03 May '11

03 May '11

I'm trying to construct some euml states with data at the time of the state machine construction. The below boils down what I'm trying to do and fails to compile. Should I expect this mechanism to work with the euml frontend ? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #include <boost/msm/back/state_machine.hpp> #include <boost/msm/front/euml/euml.hpp> namespace msm = boost::msm; using namespace msm::front::euml; BOOST_MSM_EUML_EVENT(test_event) BOOST_MSM_EUML_DECLARE_STATE((),test_state_t) struct test_state_with_constructor : public test_state_t { test_state_with_constructor() {} test_state_with_constructor(int d) : m_d(d) {} int m_d; }; test_state_with_constructor const test_state; BOOST_MSM_EUML_TRANSITION_TABLE(( test_state + test_event == test_state ), test_table) BOOST_MSM_EUML_DECLARE_STATE_MACHINE (( test_table, init_ << test_state ), test_table_) typedef msm::back::state_machine<test_table_> test_machine_t; int main() { test_machine_t tm( msm::back::states_ << test_state_with_constructor(1) ); } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ With gcc 4.5 and Boost 1.46.1, I get: simpletest.cpp: In function 'int main()': simpletest.cpp:30:75: error: no match for 'operator<<' in 'boost::msm::back::states_ << test_state_with_constructor(1)' Thanks Nate

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[serialization] pointer to non-constructable object
by Noah Roberts 03 May '11

03 May '11

The problem boils down to something similar to: struct base { virtual ~base() {} base(x_type & obj); }; struct derived { derived() : base(member_x) {} private: x_type member_x; }; ...serialize(...,base &,....) {} ...serialize(..., derived & d, ....) { ar & base_object<base>(d); ar & member_x; } boost::shared_ptr<base> ptr(new derived); ar & ptr; The problem is that base can't be constructed without the reference. It also makes no sense to override the construction stuff because it's simply not how to get that reference. There's no way to construct a base that is sensible outside of during the construction of its derived (it's a funky design I admit, but necessary). Unfortunately the serialization library insists on being able to construct a base, even though I never save one except via derived objects through a pointer to base. I noticed a check for "is_abstract" when debugging a different issue I had (that was totally my fault). So I tried adding a bogus virtual function to the interface and overriding it in derived. This fixes the problem. There must be a way to do so without such trickery though? Can this abstract check be overridden by me?

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[program_options] How to extract option value?
by Krzysztof 03 May '11

03 May '11

In order to get the option value I have this code: options_description opd; string in; opd.add_options() ("help","Display help") ("input_file,I",value<string>(),"Input file with group division"); variables_map vm; store(parse_command_line(argc,argv,opd),vm); notify(vm); if(!vm["help"].empty()) cout<<opd<<'\n'; else in = vm["input_file"].as<string>(); However the last line issues this exception: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::bad_any_cast> >' what(): boost::bad_any_cast: failed conversion using boost::any_cast What do I wrong? -- Regards Krzysztof J.

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[spirit] parsing keyword or identifier
by Brian Budge 03 May '11

03 May '11

HI all - I have what I think is a simple problem: I'm trying to parse IES files, and there is a line that can have three options: TILT=NONE -or- TILT=INCLUDE -or- TILT=<filename> The way I'm trying to parse this line is: // in the case of TILT=INCLUDE or TILT=<filename> int lampToLuminaireGeom; int numPairsWithMulFactors = 0; std::string tiltFileName; BOOST_AUTO(keywordSym, (qi::lit("NONE") | qi::lit("INCLUDE"))); BOOST_AUTO(fileName, *char_ - keywordSym); BOOST_AUTO(initial, ( "TILT" >> char_('=') >> ( "NONE" | ( "INCLUDE" >> int_[ref(lampToLuminaireGeom) = _1] >> int_[ref(numPairsWithMulFactors) = _1] ) | fileName[ref(tiltFileName)] ) ) ); if(!phrase_parse(first, last, initial, space)) { return IES_INVALID; } The code works with NONE or INCLUDE, but not with files. As far as I know, there are no real restrictions on the filenames. At this point, the code posted above can't even get simple file names, but really I think what is required is that I grab anything non-whitespace after the '=' until it reaches an EOL. Can anyone provide some insight about what I may be doing wrong? Thanks, Brian

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[wave] Custom I/O handling (include paths, etc.)?
by Anteru 03 May '11

03 May '11

Hi, I'm trying to adopt Wave as my custom preprocessor for a project. So far, things work fine, but there is one problem with Wave: I need to override all I/O functions, in particular, reading from files and opening files. Reading is easily changed by the input policy, but I couldn't find a way to register an include handler hook. There's found_include_directive, but nothing that allows me to get in-between wave and the filesystem. In my case, I on-demand construct some data which I want to be able to #include (i.e. #include <generated>) and some files are stored in resources/compressed files (#include <zip/file.h>). My include handler can open them, but how can I tell Wave to ask my include handler whether it can find a file instead of using boost::filesystem? Cheers, Anteru

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[Review] Boost.Convert library has ended
by Edward Diener 03 May '11

03 May '11

The review period for the Boost.Convert library has officially ended. I will continue to read posts about the library while I make my review decision, so please do not stop discussing the library as appropriate because the review period has ended. I have received one personal request for a late review, and I am willing to accept any other requests for a late review to be made through Wednesday and posted to the mailing list, but I will not consider any other late review in my decision unless someone requests it of me personally. I know this is a fine line between an official review and just comments about what others have said before, but I need to make my decision based on some finite set of reviews and their subsequent discussion. I would like to thank everyone who has officially reviewed Boost.Convert as well as all who have made subsequent comments. The more input received, the easier it becomes for me as a reviewer to make a final decision. I would also like to thank the implementer of the Boost.Convert library, Vladimir Batov, for his willingness to address issues, answer criticism, and engage in discussion about his library. My review decision should be made and posted to the mailing list no later than by the end of Sunday, May 8.

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Pass data to states, in boost state chart
by jusva2010 03 May '11

03 May '11

Hi All, Is there any way I can pass data to state event handler? Any pointers really appreciated. Thanks in advance Justin -- View this message in context: http://boost.2283326.n4.nabble.com/Pass-data-to-states-in-boost-state-chart… Sent from the Boost - Users mailing list archive at Nabble.com.

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Adapt rule's attribute to my own Boost::Spirit::Qi
by Egor Popov 03 May '11

03 May '11

Hello, everyone. There is a problem of attribute transfomation: I need to transfom rule's generated attribute to my own structure. I tried to parse mathematical formula and store it in std::vector in reverse Polish notation. Formula have form: math = as_string(*digit) >> (alpha) >> +(char_('+' | '-') >> math); rule<Iterator, std::string, space_type> math; Question #1: what type is it? I think that fusion::vector<std::string, char, std::vector<fusion::vector<char, std::string> > > but it seems it is not so. Question #2: how can I convert this structure, to mine (std::vector<std::string>)? -- View this message in context: http://boost.2283326.n4.nabble.com/Adapt-rule-s-attribute-to-my-own-Boost-S… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Multi-index] : code fail to compile with VS2010 and boost 1.46.1. Proposed workaround
by Mathieu Peyréga 03 May '11

03 May '11

Hello, I had some code using boost 1.46.1 Multi-index library that used to compile and work very well with VS2008. I recently turned to VS2010 and some code is not compiling anymore. The problem is located in the boost_1_46_1\boost\multi_index\composite_key.hpp file and the compiler complains about not being able to distinguish between ambiguous overloads... I had to modify the composite_key.hpp file and have following changes : line 1001 : //return operator()(x,make_tuple(cref(y))); return operator()(x,make_tuple(boost::cref(y))); line 1036 : //return operator()(make_tuple(cref(x)),y); return operator()(make_tuple(boost::cref(x)),y); In order to explicitely add the boost namespace for cref. With those changes, it do compile and works very well. Can those changes in composite_key.hpp break something else ? Is there another workaround I would have missed ? I'm suspecting some conflict with new TR1 things i'm not very familiar with... Best regards, Mathieu Peyréga

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[Spirit][Date_Time] Parsing of boost date_time (segfault)
by Vitaly Budovski 03 May '11

03 May '11

Hi, I had a go at building a binary parser to output a date/time object. Unfortunately, I ran into some serious issues. One of my grammars causes the application to segfault when compiled with gcc, but not in clang. I'm not sure if this is a bug in gcc, boost, or simply a programming error. Please see attached file. Is there a better way to achieve what I need (final output should be ptime object)? All suggestions welcome :) Thanks, Vitaly

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