August 2008 - Boost-users - lists.boost.org

[asio] using with mdns/dns-sd?
by Isaac Dupree 05 Aug '08

05 Aug '08

What I want: a (open-source, OS-portable) way to advertise my game on a local LAN, so local players can play with each other easily ("Zeroconf networking"). It looks like MDNS/DNS-SD is the most sensible choice; but it needs (or greatly benefits from) interfacing with whatever the system is running (e.g. Avahi on Linux, and I guess Bonjour on Mac, and I'm not sure quite how people manage to use it on Windows). My current networking is based on Boost.Asio, which I'm pretty happy with as a socket library (yay! finally learning how to use sockets!). Does this MDNS/DNS-SD need support from Boost.Asio, or else what's a good way to go about using it? Maybe to use Bonjour's interface because Avahi apparently implements a compatibility layer for that? (P.S. Although the actually-asynchronous IO was a little confusing. With my Haskell background, I eventually realized that many of the examples were highly obfuscated versions of lambda functions (continuations) defined within other functions, because C++ doesn't yet support such things.) -Isaac

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Website not up to date?
by Klaim 05 Aug '08

05 Aug '08

Hello, i notice that the boost.org website main page doesn't display any announcement or any other news since few months last news is : - Egg review result ><http://comments.gmane.org/gmane.comp.lib.boost.announce/193>May 18th, 2008 02:59 GMT In the mailing lists (boost-users and boost) i see some review announcements and that the v1.36 is in beta. But It's not displayed on the website. Is this a bug or is it volunteer? Joël Lamotte.

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[boost-users][multi-index] subtracting containers
by Igor R 04 Aug '08

04 Aug '08

Hi, What would be the shortest way to subtract 2 containers? multi_index_container < // ordered key > cont1, cont2; cont1.insert(a); cont1.insert(b); cont1.insert(c); cont2.insert(b); // here I'd like to do cont1 -= cont2, so that cont1 would contain (a,c) Obviously, the operator -() or -=() is unsupported. So is there a way to do this without an explicit loop? IIUC, std::remove_if() wouldn't work here, because it tries to rearrange the elements... Thank you!

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boost::serialization size limit??
by Campbell Morrison 04 Aug '08

04 Aug '08

Hi, I am using boost::serialization to send and recieve some objects over a socket (as per Asio - Serialization Example). I find that when I make the objects contain very large std::vectors (i.e. KB to MB), I get stream errors when recieving the object. Is there an upper limit in size in the serialization? Or could it be an stl or Asio thing? The type in the object that is causing the trouble is a: std::vector< double >. I haven't tried with other types. regards, campbell.

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!BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) ) causing problems on MSVC compiler
by Terdale, Shantibhushan 04 Aug '08

04 Aug '08

I am using boost for the first time and not much aware of whets going on. I am including serialization archive hpps and it is including these lines eventually somewhere inside namespace detail{ #if !BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) ) using namespace boost::detail; #endif I am using Visual Studio and MSVC compiler and this using directive is causing me problems. There is a CRITICAL_SECTION defined in boos::detail which conflicts with standard windows CRITICAL_SECTION. The thing am not able to understand is how is this Workaround works ? If this workaround checks for BORLANDC then shouldn't it just place that code for Borland compiler? Please help. Is there any other macro I can define or undefine that will get rid of this. Thanks Shanti

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[boost-users] Can't build Boost library, help please
by Hermann 04 Aug '08

04 Aug '08

I'm sorry if this wasn't posted using proper tagging the first time. I want to use Boost.Serialization so I need to build the library. But when I follow the steps in here http://www.boost.org/doc/libs/1_35_0/more/getting_started/unix-variants.html (section 5.1) I get the following error upon issuing the ./configure command: Building Boost.Jam with toolset gcc... ./configure: line 199: ./bootstrap/jam0: No such file or directory I'm using gcc version 3.4.3 20041212 (Red Hat 3.4.3-9.EL4) What could be the problem? Thanks in advance.

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[Serialization] A few questions about boost::serialization
by Sebastian.Karlsson＠mmorpgs.org 04 Aug '08

04 Aug '08

Hi, I'm considering using boost::serialization but have a few questions which I would love to get answered. 1) In the overview section performance is nowhere to be seen as a goal, which for my use case is very important. If I were to use the binary archive, how well would it perform in comparsion to a hand crafted optimized serialization aproach? I've seen in the examples that strings seems to be used to identify data, won't this create a large overhead for both deserilzation and storage? 2) I saw the thread about the reason for boost::any not being serializable. But I don't really care about portability, so in that case, is it possible to implement a non intrusive serialization aproach to boost::any? Would really appreciate some little snippet for that if that is the case. If that's not possible my last option would naturally be to make an intrusive implementation, I see no obvious aproach here since I can't make a virtual template function, so I'm kind of hoping someone could push me in the right direction if it comes to this. Besides this I can only say that the library have a very slick interface and I really dig the design :) // Sebastian Karlsson

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spirit: getting scanner position from real_p
by Marco Biasini 04 Aug '08

04 Aug '08

Hi all, I'm using boost spirit. I have a semantic action attached to a real_p. Is there a wy to get the current scanner position from this semantic action? For all the generic semantic actions, I can use the position_iterator, but since real_p only accepts functions/functors with a float argument, I'm kind of lost. Thanks in advance, Marco

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Can't build Boost library, help please
by Hermann 04 Aug '08

04 Aug '08

I want to use Boost.Serialization so I need to build the library. When I follow the steps in here http://www.boost.org/doc/libs/1_35_0/more/getting_started/unix-variants.html (section 5.1) I get the following error upon issuing the ./configure command. Building Boost.Jam with toolset gcc... ./configure: line 199: ./bootstrap/jam0: No such file or directory I'm using gcc version 3.4.3 20041212 (Red Hat 3.4.3-9.EL4) What could be the problem? Thanks in advance.

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beta.boost.org: links to docs of new libraries are broken
by Markus Werle 04 Aug '08

04 Aug '08

Hi! I visited beta.boost.org to check some of the new libs and some broken links (all links pointing to 1_35_0 stuff or into nirvana), see e.g. the links to the new libs below http://beta.boost.org/users/news/version_1_36_0. Best regards, Markus

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