October 2009 - Boost - lists.preview.boost.org

[rdb] Repository, contributing, copyright, etc
by Jean-Louis Leroy 07 Oct '09

07 Oct '09

* Respository I have set up a Mercurial repository for rdb. You can get a copy with this command: hg clone https://boost-rdb.googlecode.com/hg/ boost-rdb You can view the source without installing Mercurial at that URL. * Contributing For those who consider contributing: I would like to keep clear copyright on this work. I propose the following arrangement: if you send me a patch that touches any of my copyrighted files, and I decide to use it, then you agree to transfer the copyright on the entire patch content to me. In return, I guarantee: 1/ the files touched by the patch will remain available under the Boost license 2/ you will get credit for it in the "Acknowledgements" section of the doc. If you create a set of files that is independant from mine and wish to put it in the distributions or in the repository, then you retain the copyright on them and set the rules you want. What I have in mind here is a native binding to a database. I hope that by next year we will have native bindings for all the major databases and obviously I am not going to write them all by myself. * Please help I am looking for the sql 2003 syntax expressed as a graph, preferably available online. Books suggestions are welcome too. * Extensibility For a small touch of technical stuff in this mail: I am trying hard to make it easy to support the various dialects. Here is a proof of concept (add MySQL LIMIT clause): https://boost-rdb.googlecode.com/hg/libs/rdb/doc/examples.cpp J-L

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[utility] auto_buffer v2
by Thorsten Ottosen 07 Oct '09

07 Oct '09

Dear All, Hereby an updated class. Thanks to all who contributed with comments to the first try. I have made the following changes: 1. push_back() overloads are now growing 2. added swap() (boy, was this nasty to implement). I assume the allocator can be wapped without throwing. How do other people copy with this problem? 3. added copy-constructor + copy-assignment 4. made the min capacity equal to N, the number of elements in the stack buffer 5. the size of the internal buffer is now controlled via two policies: template< unsigned N > struct store_n_objects; template< unsigned N > struct store_n_bytes; the default is store_n_objects<256>. The reason is that we don't want the capacity to change just because we compile on a different platform. 6. added comparison operators Comments most welcome! best regards -Thorsten

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[asio] confused by multiple socket flavors
by Roland Schwarz 07 Oct '09

07 Oct '09

There is a stream_socket_service and a ip::tcp::socket class, with almost the same member functions. I do understand that the first "is_a" service while the second "has_a" service. Is there any rationale beyond just having both? When would I want to use which one? Do I have overlooked something in the documentaion? Any hints appreciated. Roland -- _________________________________________ _ _ | Roland Schwarz aka. speedsnail |_)(_ | sip:speedsnail@ekiga.net | \__) | mailto:roland.schwarz@chello.at ________| http://www.blackspace.at

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custom async devices
by Roland Schwarz 07 Oct '09

07 Oct '09

Recently I had a question about how I could use asio for performing asynchroneous file IO. In the meantime I found that there are already some classes for doing async_read_at IO on handles, but only for windows. Since I need to address multiple platforms I am wondering how I would go about that. I am thinking of an emulation layer in user-space based on threads. I guess I could set up a thread-pool that will accept async call ins. The thread pool would know about an io_service and when a task, e.g. a file IO has completed, use the post function on the io_service to invoke the completion handler. Is this a reasonable design? Any pros/cons? Does anyone know of an example that I could use as a starter? Thank you, Roland -- _________________________________________ _ _ | Roland Schwarz aka. speedsnail |_)(_ | sip:speedsnail@ekiga.net | \__) | mailto:roland.schwarz@chello.at ________| http://www.blackspace.at

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how to mark test as "expected fail" for some toolsets
by Gunter Winkler 07 Oct '09

07 Oct '09

Hello, I'd like to mark the begin_end test of uBLAS as compile-fail for MSVC 7.1 ([1]). However I was not able to figure out how this works. Does anyone have some insights (or maybe a patch) to do this? [1] http://www.boost.org/development/tests/trunk/developer/output/daw-msvc71-bo… mfg Gunter

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Bjam outside Boost tree
by Jean-Louis Leroy 06 Oct '09

06 Oct '09

I am working on a lib that is laid out in typical boost fashion: a directory with boost/rdb/includes.hpp, libs/rdb/src/stuff.cpp. When I put these two directories right inside a Boost tree that builds properly with bjam, I can build my libs as well (via chdir to libs/rdb/test and run bjam). I managed to get that much working. Now I would like to build outside the boost tree. I have found this message:http://lists.boost.org/boost-build/2002/11/2221.php but the link it contains is broken. I have tried to locate the information in the doc for half an hour now, without success. I tried to set BOOST_BUILD_PATH AND BOOST_ROOT to point to the boost tree. And copied boost-build.jam to the root of my dir. Can someone help me with this please? TIA, J-L

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simple range adapter
by Neal Becker 06 Oct '09

06 Oct '09

I'd be surprised if others haven't needed this. While range comes with an adapter for plain old C array, it doesn't come with an adapter from that other (probably more common!) kind of plain old C array: a pointer and length. This seems useful. Maybe add to examples?

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svn.boost.org has invalid ssl certifcate
by Markus Werle 06 Oct '09

06 Oct '09

Hi! Maybe this is only an issue with paranoid or misocnfigured firefox, but annoying anyway, since I change platforms very often. firefox reports: svn.boost.org uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer) Can this be fixed on the server side? best regards, Markus

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[Variant]
by Cosimo Calabrese 06 Oct '09

06 Oct '09

Hi to all, I've looked at the following example: http://www.boost.org/doc/libs/1_40_0/doc/html/variant.html#variant.motivati… and I think that miss an include: #include <string> Best regards, Cosimo Calabrese.

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Off-topic question about Boost trac
by Mateusz Loskot 05 Oct '09

05 Oct '09

Hi, First, forgive me I'm sending this off-topic question to the mailing list, but I'm actually not sure where it would belong. Probably, I should direct my question to Boost Trac admins, but I don't know how to reach them. So, here we go: I'm involved in OSGeo Foundation and we maintain number of Trac instances (http://trac.osgeo.org/) for our projects. For longer while, we've been experiencing server load issues related to Trac. I noticed that Boost Trac displays "Server Load Average" information in below the menu bar. I would like to setup the same feature for OSGeo but I can not find any information how to do it. Could you tell me how you've got this for Boost Trac? Perhaps you could also tell me why you've decided to display this "Server Load Average" information in the Boost Trac? Does it mean Boost were experiencing load issues? Thanks for your help! Best regards, -- Mateusz Loskot, http://mateusz.loskot.net Charter Member of OSGeo, http://osgeo.org

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