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Is boost::fsm suitable for embedded systems?
by Thomas Stevens 31 Aug '04

31 Aug '04

Hi, forgive me for my ignorance but I'm a boost newbie... The rationale document for boost::fsm states that the library should meet a number of requirements, numbered from 1 to 9. Especially, the sixth requirement says "support the development of arbitrarily large and complex state machines.". Ok, this may be good - I guess it is in fact good. But I'm a bit anxious that this implies that the library is therefore not suitable for enviroments where no unnecessary overhead is acceptable, like in many embedded applications. However, the seventh requirement indicates that my worries are unjustified since it reads: "allow the user to customize all resource management so that the library could be used for applications with hard real-time requirements". And further down the Rationale document one can read a section on the Resource usage of Memory which looks good. So, just to be sure, is boost::fsm suitable for the development of embedded applications where constraints such as memory footprint is an issue? (Hopefully, someone can answer this based on the experience of using the library or by knowing the code - not by reading the documentation (like me ;-)). Thanks, Thomas S.

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VC8.0 and std::list
by Pavol Droba 31 Aug '04

31 Aug '04

Hi, I have encountered a problem with vc8.0 std library. I was able to fix it, but I'm not sure what is correct according to standard. The problem can be narrowed to one simple case. In vc8.0 method iterator std::list<>::erase(iterator First, iterator Last) returns a 'singular' iterator when the list is empty after erase operation. Because I'm dependant on the returned iterator to make insertion at this point later on, I had to make an explicit workaroud. I would expect it to return .end() iterator in this case. Is this behavior correct according to standard or not? If not, is it reasonable to submit bug report? Thanks, Pavol

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Workflow, process flow, mapping of an activity diagram to code.
by Batov, Vladimir 31 Aug '04

31 Aug '04

In my spare time I've been fooling around with an implementation of an infrastructure that would allow workflow to be configured at run-time. A well-defined process flow is clearly easier to configure/implement at compile-time using the conventional means (coding). Say, bool my_process_flow() { if (call_a() == success/true) { return call_b(); } else { return call_c(); } } However, to be able to quickly adjust to changing customer requirements and/or procedures we might decide to provide a set of building blocks (like call_a, call_b, call_c) that could be assembled into a certain process flow at run-time. Maybe even give that ability to the customer themselves through, say, GUI interface. So, the infrastructure boils down to an Activity class that has an operation associated with it and can have two sub-activities to be called when the operation succeeds or fails. For example, // Create an activity with call_a() as an operation. Activity a(call_a); // Register call_b to be called when call_a succeeds. a.success() = call_b; // Regiter call_c to be called when call_a fails. a.failure() = call_b; call_a, call_b, call_c can be Activity instances themselves. So, we are building hierarchical tree-like structure to represent a certain process flow. We can easily support concurrent activities like a.success() = Concurrent(call_b)(call_c); Loops can be supported in a similar fashion (via pre-defined functiors). All mostly based on boost::function (a very handy gadget I must say. Kudos to the authors). Now after such a long and boring introduction to my actual question. :-) Is there any interest in having/developing such an infrastructure under the boost umbrella? Any input is welcomed even if you think it is a crappy idea. Best, Vladimir.

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Boost License Permission
by Fernando Cacciola 31 Aug '04

31 Aug '04

I, Fernando Luis Cacciola Carballal (Fernando Cacciola for short) give permission for all my contributions to Boost to be moved to the Boost Software License Version 1 P.S.: Odd that I need this since I have my name added to blanket_permission.txt, but I recieved the email so just in case. Fernando Cacciola SciSoft

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[format] patch for tru64cxx65
by Markus Schöpflin 31 Aug '04

31 Aug '04

Hello, attached is a patch which makes the format tests compile on tru64cxx65. It turns out that the compiler has troubles with the following code snippet: ---%<--- template <class X> class foo; namespace detail { template<class X> void bar (foo<X>& self); } template<class X> class foo { public: template<class Y> friend void detail::bar(foo<Y>&); }; --->%--- This gives the following error message: cxx: Error: /usr/users/schoepf/net/tmp/test_namelookup.cpp, line 13: declaration is incompatible with function template "void detail::bar(foo<X> &)" (declared at line 5) friend void detail::bar(foo<Y>&); ----------------------^ There are several possible workarounds I found, namely moving bar() out of the detail namespace, or making bar() a simple member of foo (not a member template), or just removing the friend declaration alltogether. I decided to use the latter workaround as it is already present in the format library for other compilers. Markus Index: format_class.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/format/format_class.hpp,v retrieving revision 1.21 diff -u -r1.21 format_class.hpp --- format_class.hpp 1 Feb 2004 14:57:09 -0000 1.21 +++ format_class.hpp 31 Aug 2004 09:11:02 -0000 @@ -83,7 +83,8 @@ #if !defined( BOOST_NO_MEMBER_TEMPLATE_FRIENDS ) \ && !BOOST_WORKAROUND(__BORLANDC__, <= 0x570) \ - && !BOOST_WORKAROUND( _CRAYC, != 0) + && !BOOST_WORKAROUND( _CRAYC, != 0) \ + && !BOOST_WORKAROUND(__DECCXX_VER, <= 60590041) // use friend templates and private members only if supported #ifndef BOOST_NO_TEMPLATE_STD_STREAM

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New option for regression.py
by Markus Schöpflin 31 Aug '04

31 Aug '04

Hello. I have done a patch for regression.py which adds a new option '--test-options'. I needed this to pass options to the actual test run. For example: python regression.py --toolset=tru64cxx65 --test-options='-sPYTHON_VERSION="2.3" -sPYTHON_ROOT="/opt" -sPYTHON_INCLUDES="/opt/include/python2.3 /opt/exec/OSF1-V5.1-alpha/include/python2.3"' Any interest in this? Markus

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[admin] Mail archive looks 'stuck'
by Jeff Garland 31 Aug '04

31 Aug '04

Not sure who's in charge of this, but the archive page looks as though it's recording any longer. Last recorded email was from this morning: http://lists.boost.org/MailArchives/boost/bydate.php Jeff

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Re: Re: Re: Review of Daryle Walker's"MoreIO"librarybeginstoday, August 21, 2004.
by JOAQUIN LOPEZ MU?Z 30 Aug '04

30 Aug '04

----- Mensaje original ----- De: Jonathan Turkanis <technews(a)kangaroologic.com> Fecha: Sábado, Agosto 28, 2004 9:27 pm Asunto: [boost] Re: Re: Re: Review of Daryle Walker's"MoreIO"librarybeginstoday, August 21, 2004. > > "Pavel Vozenilek" <pavel_vozenilek(a)hotmail.com> wrote in message > news:cgpgmb$gla$1@sea.gmane.org... > > > > "Jonathan Turkanis" wrote: > > > > > Yes, I think skip_line/skip_lines is a good combination. > > > > > > I like newline and newlines. > > > > > It is often recomended not to distinguish names only > > on plural suffix. Easy to overlook bug here. > > I know that's a consideration. But then there's tuple and tuples... > Boost.Tuple's authors would have used "tuple" alone everywhere but they found difficulties, as explained at: http://boost.org/libs/tuple/doc/design_decisions_rationale.html section "For those who are really interested in namespaces". Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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RE: [boost] Copyright and License in XML documentation
by Reece Dunn 30 Aug '04

30 Aug '04

Jeff Garland wrote: >I found a few moments to work on cleaning up licensing issues and decided >to >go make sure all the date_time xml docs have licensing info. The problem >is, >how should the copyright be added to all the files? I hunted around in >other >libraries using boostbook and it looks like they all lack copyright and >license info in all but the top level xml file. I notice that in the >library >main file we correctly notice the following construct in the inspection: > ><libraryinfo> > <author> > <firstname>Jeff</firstname> > <surname>Garland</surname> > </author> > > <copyright> > <year>2001</year> > <year>2002</year> > <year>2003</year> > <year>2004</year> > <holder>CrystalClear Software, Inc</holder> > </copyright> > > <legalnotice> > <para>Subject to the Boost Software License, Version 1.0. (See >accompanying file > <filename>LICENSE_1_0.txt</filename> or copy at <ulink > >url="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</ulink>)</para> > </legalnotice> > > <librarypurpose>A set of facilities to ease programming with dates and >times. > </librarypurpose> > <librarycategory name="category:misc"/> ></libraryinfo> This is so that the legal notice can be rendered in the introduction page of the library documentation. >So it seems one option would be to change the boostbook schema and allow >copyright and legal notice elements in each file. The other possibility >would >be to add this as a comment: > > > >Thoughts on how best to approach this? I think the best approach would be in a comment, since adding copyright markup to each file would require adding code in the XSLT files to prevent it from being rendered. Regards, Reece _________________________________________________________________ Use MSN Messenger to send music and pics to your friends http://www.msn.co.uk/messenger

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VC8.0 and algorithm/string/replace failure
by Victor A. Wagner Jr. 30 Aug '04

30 Aug '04

I compiled replace_test with vs.net2005 and debugged it. It clearly throws an exception, and re-throws it later from the test framework, which causes the "ask to terminate abnormally" message. BUT............ the output window has the following in it _before_ the exception is thrown: error: list iterators incompatible, at g:\program files\microsoft visual studio 8\vc\include\list: 283 I'm not sure why it thinks the iterators are incompatible, but.... it might help the author(s) to have the above error mentioned in the failure log (I don't know why it's not there) Victor A. Wagner Jr. http://rudbek.com The five most dangerous words in the English language: "There oughta be a law"

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