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"nested" spirit grammars and semantic actions
by Tim Robertson 26 Oct '04

26 Oct '04

Hi, I'm looking for advice on ways to "nest" spirit grammars that use semantic actions. In the past, I have written a spirit grammar that parses 2-dimensional array data from a file, and puts the data into an array object of my choosing. To do this, the grammar defines a new functor (array_insert) and calls the functor whenever a new array element is parsed. The functor puts the element into a reference to the destination object, held within the grammar: struct array_grammar { array_grammar(MyMatrix & m) : _inserter(m) {} struct array_inserter { array_inserter(MyMatrix & m) : _m(m) {} // operator() defined here... MyMatrix & _m; } // ...the usual grammar components... array_inserter _inserter; }; This works, as expected. However, I now have to write a parser for a file containing a collection of 2D arrays, where each array is delimited by tags (say, "BEGIN" and "END"). I would like to push each array into a std::vector of MyMatrix objects. Thus, it would be nice if I could re-use the array_grammar, and write a grammar which uses it to parse each array in the larger file: struct multi_array_grammar { multi_array_grammar(std::vector<MyMatrix> & v) : _inserter(v) {} struct array_inserter { array_inserter(std::vector<MyMatrix> & v) : _v(v) {} // ... operator(), etc. std::vector<MyMatrix> & _v; }; template <typename ScannerT> struct definition { definition(multi_array_grammar const & self) { array_begin = str_p("BEGIN"); array_end = str_p("END"); // Problem: how to create array_grammar with correct reference? array_grammar array(???); r = array_begin >> +array >> array_end; } }; array_inserter _inserter; }; The problem is that I can't figure out how to instantiate an array_grammar (which requires a reference to the current MyMatrix object) in order to parse the individual arrays. I have solved this problem by creating a functor in multi_array_grammar which calls the parse function for array_grammar directly, but this seems ugly to me. Do any of you have a better way? -Tim

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[FSM] Saving/Restoring the state_machine
by spooky＠go.ro 25 Oct '04

25 Oct '04

Is it possible to save the current state of the state machine to a stream or by means of boost::serialize? Details: I am building a state machine using boost::fsm that is trying to follow the activity of items in a processing pipeline. I am trying to implement a procedure that allows the software to be turned off and on again without loosing the information about the current state. Naturally, I want to have a timer and, at some interval I checkpoint the state machine and save the binary representation to a file. The contents of the file are used during application startup to restore the state machine. Can I achieve this functionality with boost::fsm? Best regards, Emil Mieilica

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tcp/ip software
by Greg Silverman 25 Oct '04

25 Oct '04

Since Boost does not have a library for TCP/IP, I was wondering what OO interface to sockets is most popular with Boost users? Greg Silverman Northrop Grumman Sunnyvale, CA

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Boost under QNX 6.2.1
by Ghorashi, Ali 25 Oct '04

25 Oct '04

Dave, I'm also trying to compile boost_1_31_0 under qnx. Could you post the QNX libraries you mentioned? Ali Ghorashi (719) 277-5506 Hardware Engineering Lockheed Martin Mission Systems 9970 Federal Dr M/S 01P, Colorado Springs CO, 80920

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RE: [Boost-users] About properties
by Townsend, Matthew 25 Oct '04

25 Oct '04

>... > >I guess the functionality he wants is like the property keyword in VC++. >Unfortunately this is a Microsoft only extension. This is acutally stolen by Microsoft from Borland Delphi's Object Pascal. I really liked the feature and wished C++ had a solution. I haven't spent any time thinking about adding it, or how to. >Any ideas? Suggestions? > >Thanks > >-delfin -matt _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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RE: [Boost-users] Re: Bjam and cygwin
by Foster, Gareth 25 Oct '04

25 Oct '04

Hmm, could well be, I just downloaded a binary of bjam rather than building it, so I bet the default download is a windows build. I did get the install to work like this, however, my project doesn't find the boost includes, even though I installed to /usr/local, shouldn't they be picked up there? What autotools magic do I need if that isn't the case? Thanks Gaz -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of David Abrahams Sent: 24 October 2004 07:00 To: boost-users(a)lists.boost.org Subject: [Boost-users] Re: Bjam and cygwin "Foster, Gareth" <gareth.foster(a)siemens.com> writes: > Just for other peoples information (these mails show up in an searchable > online archive somewhere afterall afaik), I fixed this problem by setting > the path 'in a windows' way, rather than a unix way, even though I was > building from the cygwin shell. That means ... > > bjam "-sTOOLS=GCC" "--target=/usr/local" install > > Becomes ... > > bjam "-sTOOLS=GCC" "--target=c:\cygwin\usr\local" install > > That's from memory, so excuse any slight inacuracies in the syntax there. It > does get rid of the <directory-guist> weirdness. > > Hope this helps somebody somewhere. > > Regards That's surely because you're using a bjam that was built for windows, not for Cygwin. If you rebuild bjam under Cygwin I think you'll see that Cygwin paths work. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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RE: [Boost-users] Bjam and cygwin
by Foster, Gareth 24 Oct '04

24 Oct '04

Just for other peoples information (these mails show up in an searchable online archive somewhere afterall afaik), I fixed this problem by setting the path 'in a windows' way, rather than a unix way, even though I was building from the cygwin shell. That means ... bjam "-sTOOLS=GCC" "--target=/usr/local" install Becomes ... bjam "-sTOOLS=GCC" "--target=c:\cygwin\usr\local" install That's from memory, so excuse any slight inacuracies in the syntax there. It does get rid of the <directory-guist> weirdness. Hope this helps somebody somewhere. Regards Gaz -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Foster, Gareth Sent: 18 October 2004 11:37 To: 'boost-users(a)lists.boost.org' Subject: [Boost-users] Bjam and cygwin Hello all, I keep getting the following errors using bjam ... "<directory-grist>" I have set the install to use GCC and install to /usr. I also tried with /usr/local. I read that it might be a windows/unix line break thing, but I tried the zip file, bz2 and normal tarball, extracting with the windows gui tools and the cygwin cli tools. What am I doing wrong? Thanks for any help. Gaz -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Joel Sent: 15 October 2004 00:55 To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Spirit Foster, Gareth wrote: > Hello all, > > I am trying to find some source code that uses spirit to parse C++ and > convert it to HTML, i found some on google, but i misplaced it and i > can't find it again. It looked like it could have been an example > provided with the library, but i can't see it listed in the documentation. > > On a side note, anyone know the best way to use boost with cygwin? From > source? Is there even another way? See the repository: http://spirit.sourceforge.net/repository/applications/show_contents.php Cheers, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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help with boost thread compile
by Sara Collins 23 Oct '04

23 Oct '04

This might be very easy for a lot of you but I've been banging my head on the wall. I just installed the boost library and tried to run a simple test file using boost.thread.mutex #include <boost/thread/mutex.hpp> int main() { boost::mutex m; } I got this compilation error message: undefined reference to `boost::mutex::mutex[in-charge]()' I guess I have to link in the libboost_thread.dll file somehow but I don't seem to find a solution how. Perharps I've been searching the wrong places. Please help the newbie. Thanks a lot in advance. _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com

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shared_ptr race condition
by Sharon Paisner 22 Oct '04

22 Oct '04

I'm having a problem wherein the block of code below hangs at line 16. A race condition is being created with the shared_ptrs. The Call class contains an std::map of DialogPtrs (where a DialogPtr is just a boost::shared_ptr< Dialog >) - is it legal to use a boost::shared_ptr to wrap a class that contains a dynamically allocated container like a map? note: the createDialog() method is write-locked, so that the map cannot be accessed by more than one thread at a time. 1 int main( int argc, char *argv[] ) 2 { 3 AAFramework aa; 4 CallPtr call( new Call( aa ) ); 5 6 UriPtr callee( new Uri( "sip:name@domain" ) ); 7 call->setInitialCallee( callee ); 8 9 assert( call->getInitialCallee() == callee ); 10 11 TagPtr tag( new Tag() ); 12 CallIdPtr callId( new CallId() ); 13 UriPtr contact( new Uri( "sip:contact@domain" ) ); 14 UriPtr uriComplete( new Uri( "sip:complete@domain" ) ); 15 16 DialogPtr newDialog = call->createDialog( DT_CALLEE, tag, callId, contact, uriComplete ); 17 assert( call->getDialog( DT_CALLEE ) == newDialog ); 18 19 return EXIT_SUCCESS; 20 } one of the strangest aspects of this problem is that it occurs on some machines, but not others, and I have yet to determine the difference between the systems on which it works and the systems on which it doesn't work. Boost's use of so much inline code makes it very difficult to debug the program. in case it helps any, I'm using boost-1.31 and gcc-3.4.2. thanks, Sharon

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[sandbox/socket]1.32/vc7.1: Who's in charge???
by Francis ANDRE 22 Oct '04

22 Oct '04

Hi I am trying to get the boost-sandbox/socket running but it seems that this socket library is out of sync, at least for vc7.1. Who is in charge of this library since Hugo DUNCAN has moved its code base out of the boost foundry?? Cheers Francis

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