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[concept_check] Some issues
by Robert Kawulak 23 Dec '11

23 Dec '11

Hi, I've spotted some problems when playing with BCCL: - The implementation of assignable_archetype defines private default and copy constructors, so for example assignable_archetype<copy_constructible_archetype<>> will not actually be copy constructible. The same for convertible_to_archetype and convertible_from_archetype, but additionally with copy assignment. Is this by purpose? - copy_constructible_archetype defines public default constructor - again, am I overlooking something or it should not be there? - Function and predicate archetypes also seem to provide too wide interface (they are copy constructible and assignable). Additionally, they don't allow for archetypes chaining since they lack the Base parameter (with the only exception of binary_predicate_archetype - why the inconsistency?) - Apart from the provided function object concepts and archetypes it seems it would be useful to have a general Callable concept and the corresponding callable_archetype, parameterised with the types of arguments and return value. Wouldn't it be valuable to add them? - There's boost/concept_check directory in the trunk - are the files in it actually used anywhere? I've found no reference to them in Boost headers, documentation doesn't mention them too. Best regards, Robert

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boost and google search
by Edward Rankin 23 Dec '11

23 Dec '11

Hi, I am sure it is pretty common for users of boost to use google to search for documentation/tutorials on their favorite library in boost. I have found that the top hits are typically not the latest documents. For example I just searched for boost,foreach and a documentation from 1.35 was the first hit. It would be great if there is a way to tell google to update their links to the latest version. Anyone knows whether this is possible, and how to make it happen? This problem probably applies to any search engine but I can only comment on google search. Thanks, Edward

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constness in barrier.hpp
by Gaetano Mendola 23 Dec '11

23 Dec '11

Hi all, simple patch to make const the private member m_threshold in class barrier Regards Gaetano --- barrier.hpp.original 2011-12-22 12:05:05.921720854 +0100 +++ barrier.hpp 2011-12-22 12:05:36.936205847 +0100 @@ -52,7 +52,7 @@ private: mutex m_mutex; condition_variable m_cond; - unsigned int m_threshold; + const unsigned int m_threshold; unsigned int m_count; unsigned int m_generation; };

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[config] ok to merge forceinline changeset to release?
by Eric Niebler 23 Dec '11

23 Dec '11

I got a little overzealous and merged to release some code that uses BOOST_FORCEINLINE, only to discover that that macro doesn't exist on the release branch yet. The right fix is probably to get config in sync between the two branches. OK to merge [74917] to release? -- Eric Niebler BoostPro Computing http://www.boostpro.com

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Re: [boost] RFC: Multiprecision arithmetic library
by John Maddock 22 Dec '11

22 Dec '11

>I really like the idea, and the API looks good. > > Have you considered an MPIR backend, in addition to GMP and others? Being > the > Windows port of GMP, the interfaces and usage are identical. Nod, the two are treated the same - in fact I use MPIR for testing under Visual Studio. John.

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it would be nice if people logged into trac before commenting on tickets.
by Marshall Clow 22 Dec '11

22 Dec '11

That way we don't get things like this: > Changes (by anonymous): > > * status: new => closed > * resolution: => invalid Thanks, everyone! -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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Re: [boost] ASIO Query
by Olaf van der Spek 21 Dec '11

21 Dec '11

On Wed, Dec 21, 2011 at 9:21 PM, james(a)jamesbb.co.uk <james(a)jamesbb.co.uk> wrote: > Blocking - I've thought about this, but the MySQL C/C++ libraries unfortunately > don't provide asynchronous queries. > > I'm thinking of moving database reads into a seperate thread(s). It would be > nice if I can integrate this with the io_service, but I'm unsure how to do so. > Is it possible to pass arbitrary work items to an io_service, in the same manner > as async_read/write? Does every request involve blocking calls? If so, I'd not go with a 'shared nothing' design. Olaf

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Re: [boost] ASIO Query
by james＠jamesbb.co.uk 21 Dec '11

21 Dec '11

After a little reading of the ASIO documentation, it looks like I should be able to run a seperate io_service on another thread, and post() database queries to it. If I bind a callback with the query, the results/error can be passed back to the initiator without too much trouble. Seems like boost is the answer to everything. Assuming I can keep the database queries asynchronous, would anyone recommend HTTP example 2 or 3? Appreciated, thanks again. On 21 December 2011 at 20:21 "james(a)jamesbb.co.uk" <james(a)jamesbb.co.uk> wrote: > Blocking - I've thought about this, but the MySQL C/C++ libraries > unfortunately > don't provide asynchronous queries. > > I'm thinking of moving database reads into a seperate thread(s). It would be > nice if I can integrate this with the io_service, but I'm unsure how to do so. > Is it possible to pass arbitrary work items to an io_service, in the same > manner > as async_read/write? > > Many thanks. > > > > > On 21 December 2011 at 16:07 Olaf van der Spek <ml(a)vdspek.org> wrote: > > > On Wed, Dec 21, 2011 at 3:27 PM, james(a)jamesbb.co.uk > > <james(a)jamesbb.co.uk> wrote: > > > I'm hoping for opinions on using an io_service per core against a single > > > io_service with multiple threads (similar to HTTP Server examples 2 & 3). > > > The > > > application is a TCP authentication / proxy server, intended to use all > > > available cores. > > > > > > - The TCP streams consist of small messages (usually a few hundred bytes) > > > which > > > can individually be processed quickly. > > > - Connections themselves are fairly long lasting - average around 4 hours, > > > although occasionally up to 10-12 hours. > > > > > > We're looking for a 'shared nothing' design between threads - database > > > queries > > > can be made per-thread (using TLS), for example. > > > > Are database queries blocking or non-blocking? If they're blocking, > > won't this also block other connections handled by the same thread? > > > > Olaf > > > > _______________________________________________ > > Unsubscribe & other changes: > > http://lists.boost.org/mailman/listinfo.cgi/boost

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Re: [boost] ASIO Query
by Olaf van der Spek 21 Dec '11

21 Dec '11

On Wed, Dec 21, 2011 at 3:27 PM, james(a)jamesbb.co.uk <james(a)jamesbb.co.uk> wrote: > I'm hoping for opinions on using an io_service per core against a single > io_service with multiple threads (similar to HTTP Server examples 2 & 3). The > application is a TCP authentication / proxy server, intended to use all > available cores. > > - The TCP streams consist of small messages (usually a few hundred bytes) which > can individually be processed quickly. > - Connections themselves are fairly long lasting - average around 4 hours, > although occasionally up to 10-12 hours. > > We're looking for a 'shared nothing' design between threads - database queries > can be made per-thread (using TLS), for example. Are database queries blocking or non-blocking? If they're blocking, won't this also block other connections handled by the same thread? Olaf

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Contact to lists.boost.org owners
by Mateusz Łoskot 21 Dec '11

21 Dec '11

Hi, I have tried to get in touch with ML managers at boost-owner(a)lists.boost.org I haven't received any response for a few days. What is the current contact to request new ML on lists.boost.org server? Best regards, -- Mateusz Loskot, http://mateusz.loskot.net

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