June 2006 - Boost-users - lists.preview.boost.org

portable way to get present time and date
by Stephen Torri 20 Jun '06

20 Jun '06

What is a portable way to get the present time and date? Stephen

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[statechart] - templated asynchronous_state_machine compilation problem
by Oliver.Kowalke＠qimonda.com 19 Jun '06

19 Jun '06

Hello, I've a problem to compile (gcc- 4.1.2) a templated asynchronous state machine. error: expected `)' before 'ctx' template< typename streamT > struct proto; template< typename streamT > class presentation : public sc::asynchronous_state_machine< presentation< streamT >, proto< streamT >, sc::fifo_scheduler<> > { public: typedef streamT stream_type; presentation( my_context ctx) : my_base( ctx) // error: expected `)' before 'ctx' {} }; Thanks, Oliver

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C++ Template Metaprogramming Book - Chapter 4
by Eduardo Bezerra 19 Jun '06

19 Jun '06

Hi, In C++ Template Metaprogramming chapter 4, item 4.1.2. Lazy Type Selection typename is_scalar<T>::type and is_scalar<T> can be used interchangeably as in the example below: template <class T> struct param_type : mpl::eval_if< typename boost::is_scalar<T>::type , mpl::identity<T> , boost::add_reference<T const> > // no ::type here {}; template <class T> struct param_type : mpl::eval_if< boost::is_scalar<T> , mpl::identity<T> , boost::add_reference<T const> > {}; I'm still trying to figure out the reason why. I understand that to invoke a metafunction you have to reach into its nested ::type member and I also know that integral constant wrappers have a ::value member. Any help would be greatly appreciated Regards, Eduardo

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mpl::transform question
by Ovanes Markarian 19 Jun '06

19 Jun '06

Hello all, somehow I have extreme difficulties to use mpl. Please do not understand this as any kind of blaming. I find the library really great and the possiblities it offers are tremendous. Currently I have some sort of problem, where I stuck at: I have an mpl::vector instance of form (mpl namespace was left out for better readability): class A; class B; class C; typedef vector< pair<int_<0>, A>, pair<int_<1>, B>, pair<int_<2>, C> > types_vector; Now I would like to use the mpl::transform algorithm to transform this vector into the mpl::map. I try to do it in the following way: typedef mpl::transform<type_vector, mpl::insert<mpl::map<>, mpl::_1 >::type type_map; And I also understand that _1 has no embedded typedefs for first and second, what a pair should have, so I am stuck here. David pointed me to the MPL Book, which I ordered, but unfortunately it is on the way to me... So if someone could help I would be really thankful. With Kind Regards, Ovanes Markarian

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Re: [Boost-users] [Interprocess] How to Get Started?
by Wu Yinghui, Freddie 19 Jun '06

19 Jun '06

boost-users-request(a)lists.boost.org wrote: > From: > Ion Gaztañaga <igaztanaga(a)gmail.com> > Date: > Mon, 19 Jun 2006 16:17:45 +0200 > > Hi, > >> I can see that Boost.Interprocess (former Shmem) is now in the CVS. But >> is there any documentation on it to get one started? > > There is no documentation for the moment. The CVS was intended for > advanced Shmem users that wanted to start testing the code based on tests. > > I've started writing the documentation, but still a few introductory > pages, but I will need some time to have something useful, since I'm > quite busy for the moment. > > Regards, > > Ion Thanks for your efforts! I think I can wait for a little while for the moment. Or... can I make use of the shmem docs in the sandbox instead? Any brief summary on the difference between that shmem version and the cvs interprocess version? Cheers, Freddie

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Boost serializer: incomplete type error reported
by Diego Molla 19 Jun '06

19 Jun '06

Hello, I have an error that is puzzling me. I have defined serialization of several custom classes, and everything worked perfectly until we've changed to a new Linux OS and had to reinstall Boost. Now the program doesn't compile and the error given is: error: incomplete type 'boost::serialization::extended_type_info_null<SetOfRules>' used in nested name specifier I don't really understand why it says there is an incomplete type when there used to be no errors. The same error happens with all the classes where I've defined serialization. The offending code for the above error message is: void save(const SetOfRules &sor, const string &fileName) { std::ofstream fout(fileName.c_str()); boost::archive::text_oarchive oa(fout); oa << sor; // <== Here is the error fout.close(); } // save Currently I'm using gcc version 4.0.4 20060507 (prerelease) (Debian 4.0.3-3) Can anybody help? Diego -- Do you want to know what is going on in Language Technology in Australia and New Zealand? Join ALTA -- http://www.alta.asn.au/ This message is intended for the addressee named and may contain confidential information. If you are not the intended recipient, please delete it and notify the sender. Views expressed in this message are those of the individual sender, and are not necessarily the views of Macquarie University. --------------------------------------------------------------------- Diego MOLLA ALIOD diego(a)ics.mq.edu.au Department of Computing http://www.ics.mq.edu.au/~diego Macquarie University

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Re: [Boost-users] [Interprocess] How to Get Started?
by Wu Yinghui, Freddie 19 Jun '06

19 Jun '06

> From: > Jan Stetka <janpstetka(a)tiscali.co.uk> > Date: > Mon, 19 Jun 2006 14:05:55 +0100 > Wu Yinghui, Freddie wrote: >> Hi all, >> >> I can see that Boost.Interprocess (former Shmem) is now in the CVS. But >> is there any documentation on it to get one started? >> >> I intend to test it out for our future development, but so far I've not >> been able to find information specific to the now Interprocess library. >> So is there any documentation available anywhere on the web now? >> > > Have you looked at the documentation for shmem in the sandbox? > Thanks Not really, since I'm not sure about the changes/differences between the sandbox shmem and the interprocess in the CVS. I've not seen any pointer regarding the differences of interprocess and shmem so far. I'll try to take a look at the documentation for the sandbox shmem tomorrow, though. Hope I can get enough information there to get started. Cheers, Freddie

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Good Template questions enlist
by Hughes, James 19 Jun '06

19 Jun '06

Hello all, I have a convoluted problem with templates and shared libs under Linux that I would like to get some advice on. Since it's not particularly Boost related, does anyone have any suggestions of a good mailing list on which I can ask my question. Or should I ask it here (I think not) Thanks James This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately.

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[Interprocess] How to Get Started?
by Wu Yinghui, Freddie 19 Jun '06

19 Jun '06

Hi all, I can see that Boost.Interprocess (former Shmem) is now in the CVS. But is there any documentation on it to get one started? I intend to test it out for our future development, but so far I've not been able to find information specific to the now Interprocess library. So is there any documentation available anywhere on the web now? Cheers, Freddie -- Wu Yinghui, Freddie Research & Development Software Engineer Volume Interactions Pte Ltd 1 Kim Seng Promenade, #12-01 Great World City East Tower Singapore 237994 Tel: +65 62226962 (Ext 216) Fax: +65 62226215 Email: yhwu(a)volumeinteractions.com URL: http://www.volumeinteractions.com Important: This message is intended for the recipient(s) addressed above. It contains privileged and confidential information. If you are not the intended recipient, please notify the sender immediately by replying to this message and then delete it from your system. You must not read, copy, use, or disseminate this communication in any form. Thank you.

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Debug data structures using aligned storage
by Pierre THIERRY 19 Jun '06

19 Jun '06

Hi, I've googled for web pages and groups, but I didn't even find anyone *asking* that question: How can I debug data structures using aligned storage? It's very practical to use a graphical debugger like DDD to browse data structures like linked lists or trees. But aligned storages, as used by boost::variant, are opaque to the debugger. Blindly, Nowhere man -- nowhere.man(a)levallois.eu.org OpenPGP 0xD9D50D8A

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