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message based TCP protocol?
by bringiton bringiton 23 May '07

23 May '07

Hi guys, I'm wondering whether you know a solution to the following problem: I wish to have a tcp connection that sends binary messages of dynamic length. I plan on using asio, but I am concerned with the following: say i send 5 messages with lengths (10, 5, 30, 2, 3). As far as I understand TCP, when I read the stream on the other end, I will not receive the data 1 message at a time. Instead I will receive a stream that may hold N messages and may even hold portions of a message. eg the stream may hold 13 bytes, which is the first message and 3 bites of the 2nd. Are there any solutions to this? ie building messages as they come in through the TCP stream. I know how to implement this myself however I assume that this is probably a common problem. Thanks.

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How do you catch a ABORT signal?
by Stephen Torri 23 May '07

23 May '07

I have code that has error checking to see if pointers are null at run-time. If a pointer is null I am calling abort(). How can I check it with the boost test library? Stephen

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bind + thread
by Nicolas Emiliani 23 May '07

23 May '07

Hi, I was programming a stupid server using boost::thread and boost::bind... and sadly I encountered a problem... probably due to my inexpertice with the library. The thing is that i'm creting a boost thread object like this : struct bla{ void member(){} } bla b; boost::thread t( boost::bind( &bla::member , &b) ); this works fine but, i need to bind a member pointer that returns an int, so as i understand i need to do this : boost::bind<int>( &bla::member_that_returns_int , &b) but boost::thread won't accept it in the constructor... So... what I'm asking is.... is there a trick to do this that I'm not aware of?... basically what occucrred to me was to encapsulate de method that returns an int using the () operator... but it seems pretty nasty to me. is there a way to do it staright forward with boost::bind? thanks! Nico

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mis-filed emails!
by Gottlob Frege 22 May '07

22 May '07

I just (finally) realized that for the past month or so, gmail has been marking some boost mail as spam. In fact, all of Dave Abrahams emails have been going straight to the spam folder (sorry Dave!), as well as emails from a few others (not sure of the overall pattern). Anyhow, just in case anyone was expecting a reply from me and didn't get one, that would be why. I now have an extra 100 or so emails to catch up on, but I doubt I'll reply to any, so as to not re-open any old threads. Tony

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setting program_options programmatically
by Joshua ChaitinPollak 22 May '07

22 May '07

Hello, I'm gradually porting my application to Boost, and I'm starting to use the program_options library. I'm also using the boost::unit_test library, and for some higher level unit tests its often convenient to programmatically setup some properties specific to the test before it runs. I can't figure out how to programmatically set program_options in the variable_map however. I currently wrap the boost::program_options interface with a simple Config class, so what I'd like to have is something like this: Config::setProperty(std::string &option, std::string &value); Config::setProperty(std::string &option, int value); Config::setProperty(std::string &option, bool value); But I can't even get a generic std::string implementation working. It looks like I have go through creating basic_option and basic_parsed_options objects and calling po::store(parsed_options, vm); except that instead of "std::string& option" above, I need to pass in the option_description& object, which starts to get messy. Is there an elegant way of doing this? Thanks, Josh -- Joshua ChaitinPollak Software Engineer Kiva Systems

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executable statecharts
by NFarnsworth＠web.de 22 May '07

22 May '07

Hello, I have a question to the boost statechart library. I work on a Project which has the ambition to execute statecharts which a user has designed. Is it possible to implement this with the help of the boost statechart library or are there any restrictions concerning the boost statechart library to do this? I not mean to design statecharts but to simulate them. I think I can implement executable statecharts by representing the statechart- model as a graph, wich gives me the information how to build the statechart objects in the correct order and howto attach the transactions. Thank you for your help in advance and best regards, Niklas _______________________________________________________________ SMS schreiben mit WEB.DE FreeMail - einfach, schnell und kostenguenstig. Jetzt gleich testen! http://f.web.de/?mc=021192

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Possible bug in iostreams: multichar_wfilter vs multichar_filter
by Chad Walters 22 May '07

22 May '07

I was looking through the iostreams sources and came across this in boost/iostreams/concepts.hpp: //------Definitions of helper templates for multi-character filter cncepts----// template<typename Mode, typename Ch = char> struct multichar_filter : filter<Mode, Ch> { struct category : filter<Mode, Ch>::category, multichar_tag { }; }; template<typename Mode, typename Ch = wchar_t> struct multichar_wfilter : multichar_filter<Mode, Ch> { }; typedef multichar_filter<input> multichar_input_filter; typedef multichar_filter<input> multichar_input_wfilter; typedef multichar_filter<output> multichar_output_filter; typedef multichar_filter<output> multichar_output_wfilter; typedef multichar_filter<dual_use> multichar_dual_use_filter; typedef multichar_filter<dual_use> multichar_dual_use_wfilter; //-------------------------------------------------------------------------- --// It seems to me that the wide versions of these typedefs should be defined using multichar_wfilter, making the typedefs appear as follows: typedef multichar_filter<input> multichar_input_filter; typedef multichar_wfilter<input> multichar_input_wfilter; typedef multichar_filter<output> multichar_output_filter; typedef multichar_wfilter<output> multichar_output_wfilter; typedef multichar_filter<dual_use> multichar_dual_use_filter; typedef multichar_wfilter<dual_use> multichar_dual_use_wfilter; Also, the default arguments in multichar_filter and multichar_wfilter termplates aren't wrapped in BOOST_IOSTREAMS_DEFAULT_ARG(), unlike the other ones in this file. Seems like they should be, for consistency if nothing else. Chad

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Xpressive with non char data
by gast128 22 May '07

22 May '07

Dear all, The new Boost version ships with an extra regular expression library. Now I need a dynamic regualr expression on a std::vector<std::string>. The character type would be a string (since in that case multiple characters are allowed on the same position). Is this possible with xpressive? Boost.Regex didn't seem to support it according to a previous post. wkr, me

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building specific versions of boost
by Filip Konvička 22 May '07

22 May '07

Hi, I wanted to build just the <threading>multi <link>static <runtime-link>dynamic version of Boost 1.34 with MSVC 8.0. However, I did not find any info on how to do that, do I ended up deleting the extra targets from Jamfile.v2's "default-build". Sure there is a better way of doing this (some command-line flags)? Thanks, Filip

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[1.34.0] x86_64 rpms available with Boost.Asio 0.3.8rc2 and Boost.GIL 2.0 included.
by Chris Fairles 22 May '07

22 May '07

I've seen the odd request for asio to be included with boost. I hacked together a boost rpm package that includes asio and just for fun I stuck Boost.GIL 2.0 in there as well. You can find the rpms here: http://blog.tripthelight.net/?p=4 They were built on a CentOS 5 platform (rhel5 compatible) with gcc 4.1.1 The asio docs are missing. I'm not a BBv2 expert and couldnt really figure out how the docs are built and how to add asio's (attempted several things by mimicing how other docs are built to no avail). Gil didn't include docs, just a html file pointing to the homepage. Of course, I don't take responsibility if these mess up your system. They work for me "as is" but your milage may vary. Do let me know if theres serious issues however and I'll see what I can do. Chris

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