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Serializing a variant
by Richard Peters 24 Nov '04

24 Nov '04

Hello, I'm looking for a way to serialize a variant. I see two possibly difficult things that I don't know how to accomplish: 1) In order to be able to retrieve a variant from an archive, the type of the value held by the variant must be stored. 2) When retrieving the data from an archive, once the type is read, a value of that type must be extracted from the archive and assigned to the variant. Has anybody tried this before, is this as difficult as it looks? Any help would be greatly appreciated. best regards, Richard Peters

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Boost 1.32 vs. tru64cxx65
by Richard Hadsell 24 Nov '04

24 Nov '04

I'm trying to build some of the Boost libraries for the tru64cxx65 toolset. It seems that a header is missing from my compiler (Compaq C++ V6.5-030 for Digital UNIX V4.0F). This kind of error is showing up in a lot of code, since it seems to be a problem in a basic Boost header: cxx: Error: /tmp_mnt/netDISKS/cgi/DIGITAL6/cgi/vendor/library/boost/boost_1_32_0/boost/cstdint.hpp, line 87: #5 could not open source file "inttypes.h" # include <inttypes.h> ----------------------^ cxx: Error: /tmp_mnt/netDISKS/cgi/DIGITAL6/cgi/vendor/library/boost/boost_1_32_0/boost/cstdint.hpp, line 91: #282 the global scope has no "int8_t" using ::int8_t; ----------^ cxx: Error: /tmp_mnt/netDISKS/cgi/DIGITAL6/cgi/vendor/library/boost/boost_1_32_0/boost/cstdint.hpp, line 92: #20 identifier "int8_t" is undefined typedef int8_t int_least8_t; ----------^ ... cxx: Info: 27 errors detected in the compilation of "/tmp_mnt/netDISKS/cgi/DIGITAL6/cgi/vendor/library/boost/boost_1_32_0/libs/filesystem/build/../src/convenience.cpp". cxx -c -timplicit_local -ptr "bin/boost/libs/filesystem/build/libboost_filesystem.so/tru64cxx65/release/cxx_repository" -noimplicit_include -D__USE_STD_IOSTREAM -nousing_std -msg_display_number -msg_disable 186,450,1115 -DNDEBUG -DNDEBUG -DBOOST_FILESYSTEM_DYN_LINK=1 -O2 -model ansi -I"bin/boost/libs/filesystem/build" -I"/tmp_mnt/netDISKS/cgi/DIGITAL6/cgi/vendor/library/boost/boost_1_32_0" -I"/usr/include" -I"/tmp_mnt/netDISKS/cgi/DIGITAL6/cgi/vendor/library/boost/boost_1_32_0" -o "bin/boost/libs/filesystem/build/libboost_filesystem.so/tru64cxx65/release/convenience.o" "/tmp_mnt/netDISKS/cgi/DIGITAL6/cgi/vendor/library/boost/boost_1_32_0/libs/filesystem/build/../src/convenience.cpp" -- Dick Hadsell 914-259-6320 Fax: 914-259-6499 Reply-to: hadsell(a)blueskystudios.com Blue Sky Studios http://www.blueskystudios.com 44 South Broadway, White Plains, NY 10601

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RE: [boost] Thread: Why is my prog aborting after 283 or so threads?
by Tim Laplaca 24 Nov '04

24 Nov '04

I switched the parameter-passing to the bind method, e.g. thrds.create_thread( boost::bind( updatethread, threadid, "123456789" ) ); with no difference. I did find that the same code that "aborts" under Linux seems to run ok under Windows. -----Original Message----- From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Tim Laplaca Sent: Tuesday, November 23, 2004 3:32 PM To: boost(a)lists.boost.org Subject: [boost] Thread: Why is my prog aborting after 283 or so threads? I wrote a prog that spawns threads (RED HAT Fedora Core 2), and after spawning 283 or so threads, it stops running and 'Aborted' is printed. It doesn't matter if I spawn them one after each other, or only 10 at a time, or if the threads only last 1 second or if they all stick around until the 283rd thread is spawned. Every combination I've tried results in the prog aborting at about the 283rd thread spawn. Does this sound familiar to anybody? Is there something my thread must do to properly shut itself down? Does it need to call some kind of procedure to announce it is going away for proper cleanup? I couldn't see anything in the examples like that. And is there documentation explaining the examples? I failed to find any. My thread procedure: void updatethread(void* inparams) { thread_params *tparam; tparam=(thread_params *)inparams; int local_threadid = tparam->param1; std::string DID = tparam->param2; { boost::mutex::scoped_lock scoped_lock(io_mutex); std::cout << " Thread:" << local_threadid << " running. " "UPDATE for " << DID << std::endl; } // wait some secs (just for debug, remove when real work is being done) boost::xtime xt; boost::xtime_get(&xt, boost::TIME_UTC); xt.sec += 2; boost::thread::sleep(xt); { boost::mutex::scoped_lock scoped_lock(io_mutex); std::cout << " Thread:" << local_threadid << " Exiting. " << std::endl; } { boost::mutex::scoped_lock scoped_lock(numthreads_mutex); --activethreads; } } MAIN calls it with this: //spawn thread tparam.param1=threadid; tparam.param2=dids[i]; boost::thread *pt; pt = thrds.create_thread(thread_adapter(&updatethread, (void*)&tparam)); Thanks, Tim _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Another logo proposal
by Joaquín Mª López Muñoz 24 Nov '04

24 Nov '04

Here's my take. I'm providing b/w and color versions. The idea is to provide an abstract logo to associate with Boost while retaining the visual link with the previous artwork (through using the same Impact font for the name, a very appropriate font IMHO.) Some more rationales behind the proposal: * It can be easily rasterized. * It goes well with flat backgrounds. * It works as a transition from the old logo. As for the logo itself, it tries to convey the following connotations: * Its square shape, and the fact that is bottom aligned with the text, gives a sense of solidness. * It reminds the reader of a set of construction toolkit pieces, which associates well with Boost being a repository of general purpose libraries. * The "++" part of C++ is retained, integrated into the logo. Going a little pedantic, one can even recognize the logo as a deconstruction of "C++", where the L-shaped pieces are the two halves of an upper "C", split and shifted. Dya like it? Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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RE: [boost] boost.thread : Can one create a thread withanobjectmemberfunction?
by Tim Laplaca 24 Nov '04

24 Nov '04

Thanks! For some reason it never occurred to me that there were includes at the boost root.... Tim -----Original Message----- From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Peter Dimov Sent: Tuesday, November 23, 2004 5:38 PM To: boost(a)lists.boost.org Subject: Re: [boost] boost.thread : Can one create a thread withanobjectmemberfunction? Tim Laplaca wrote: > I assume I need to include some bind includes to get this to compile > (I'm getting "error: `bind' undeclared in namespace `boost'". > > I see several includes in /usr/include/boost/bind. Which should I > include? None are obvious to me, like 'bind.hpp' would be. #include <boost/bind.hpp> :-) _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Any interest in a boost::glob() function?
by Angus Leeming 24 Nov '04

24 Nov '04

Dear all, I've taken Richard Johnson's glob_iterator that he posted to the list back in January and re-written it completely, using Boost.Spirit to transform the input 'glob' into an equivalent regex. The result is a 'boost::glob' function that I believe is fully POSIX-conformant. Example usage: fs::path const starting_directory("."); std::list<fs::path> const matches = boost::glob("../te?t/foo*bar", starting_directory); The docs can be browsed online at http://www.devel.lyx.org/~leeming/globbing/index.html The library can be found at http://www.devel.lyx.org/~leeming/globbing.zip It should unzip to give: boost/glob.hpp boost/detail/glob.hpp libs/glob + ensuing sub directories and files. The code has been tested on Linux (g++ 3.3.2) and on Windows using MinGW/MinSys. There are still a few "issues" that I don't know how to resolve. Any pointers would be most welcome. DOCS ==== * It would be nice to insert a table inside an itemized list item, but quickbook doesn't like doing that. I need to add a separate paragraph. * boostbook/doxygen fails to document the glob_flags enum. * I generate a BOOST_LIB_NAME.html page and would like not to. BUILD ===== I have a couple of targets, lib/glob/example/real_glob.cpp and lib/glob/test/test_real_glob.cpp that I'd like to build only on POSIX machines. (They're wrappers for the system glob function.) Any pointers on how to instruct bjam to do that? REGEX ===== One test is failing on Windows "foo[[:alpha:]]bar". It works when compiled under Linux. Is there anything I should be aware of about Boost.Regex under MinGW/MinSYS? Regards, Angus

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Booster rockets
by Deane Yang 24 Nov '04

24 Nov '04

How about just an upward slanted "C++" with booster rockets on each side of it shooting out flames? You don't even need the word "boost" with that, but it could still be there as Dave has it.

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[Program Options Library] Does Program Options Library support "sections" in config file?
by 周方 Frank Chow 24 Nov '04

24 Nov '04

For example, to connect different databases according to different requests, there are some options stored in a config file, like this: [DB1] server=172.16.21.1 database=dbname1 userid=someone1 password=xxxxxx [DB2] server=172.16.21.2 database=dbname2 userid=someone2 password=oooooo i.e. with same key name in different sectors. In Win32 API, this method is very handy: // to get "server" in "[DB1]" char buf[256]; GetPrivateProfileString (""DB1, "server", "", buf, sizeof(buf), "configfile.ini"); Is there a mechanism in "Program Options Library" to support this config file? Or, does it intend to support? Thanks!

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logos with rockets
by David Abrahams 24 Nov '04

24 Nov '04

Here are some further attempts. Be sure to look at the first two slides. http://www.luannocracy.com/logo.ppt Sorry about the file format. I have been having trouble exporting these pictures accurately from PowerPoint. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com

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RE: [boost] preprocessor fix
by Arias Brent-P96059 24 Nov '04

24 Nov '04

> Have you seen http://www.cuj.com/documents/s=8470/cujboost0306besser/? Yes, I have seen that before. I did not use it for several reasons: (1) I think the source for Besser's ENUM was not easily available, (2) my employer gets nervous when code "looks" too C++ oriented and gets nervous when macros become too "involved" - which means "lengthy" (3) Besser's ENUMX macro requires that you specify the number of parameters (e.g. ENUM3 or ENUM23). Reason #3 was a real hurdle for me - because I'm trying to provide this macro to other developers who might "rebel" if using the macro requires from them non-intuitive new concepts or exercises. That is, if they didn't have to count the number of parameters in the enumeration before - they may well reject the ENUM macro if it starts to require them to count the entries. So, I set out to make an ENUM macro that (1) didn't need its entries counted by the developer and (2) had a short definition (which makes it less daunting for "managment" buy-in). You said: >there are still basic notions of computation, etc., such as >control flow--which is nothing but a conditional "invocation" >of its accompanying code. Those kinds of things still apply >at the preprocessor level. What you really needed was a way to >conditionally enumerate some sequence elements, not enumerate a >conditional sequence. My implementation was "backwards" because I was unable to make the code compile otherwise. That is, depending on the value of ENUMS, the following code did not compile: > #define ENUM(name, start, entries) \ > BOOST_PP_EXPR_IIF(ENUMS)( \ > BOOST_PP_SEQ_ENUM( \ > (typedef enum { BOOST_PP_SEQ_HEAD(entries) = start) \ > BOOST_PP_SEQ_TAIL(entries) \ > (LAST_ ## name } name;) \ > ) \ > ) \ You said: >You can do it, but EXPR_IIF does not lazily evaluate its > argument (the syntax above is what EXPR_IIF would look > like if it *did* lazily evaluate it argument). >In other words, when ENUMS is 0, SEQ_ENUM will still be >invoked, but its results will be discarded. I'm not sure what you are suggesting. Depending on the value of ENUMS, the code snippet I showed above would not compile - lazy evaluation or not. If it won't compile, then there's nothing for me to ponder (except to use a different approach - which happily you taught me with the TUPLE_EAT macro). :) Paul, thanks so much for the help you've provided. -Brent

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