December 2007 - Boost-users

Re: [Boost-users] [boost] [serialization] typeid information is not included in archives
by Andrei Popa 19 Dec '07

19 Dec '07

Hi Mahesh, I think I understand better what you are to say. I read about extended_type_info, I will try your solution. Thanks, Andrei _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

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Boost shared pointers, PThreads and void* casts
by STenyaK (Bruno Gonzalez) 19 Dec '07

19 Dec '07

I haven't been able to find any clear explanation about this, so here it goes: I'm coding a multithreaded program using pthreads. The general behaviour is this: -A function starts. -The function creates a shared pointer "OBJ". -The function creates a Thread, passing "OBJ" as the parameter (having to cast it as void*). -The thread starts, getting a (void*) param which is casted back to "OBJ" (shared pointer type). -The function ends, and therefore its "OBJ" goes out of scope. -The thread" ends, so its "OBJ" goes out of scope too. (of course, the thread could at times end before the function instead) I'm afraid that the shared pointer does not behave well due to those nasty void* casts... maybe trying to delete twice the object. What's the proper way of coding this? Weak pointers maybe? Thanks a lot for any help. -- Saludos, Bruno González _______________________________________________ Msn/Jabber: stenyak AT gmail.com ICQ: 153709484 http://www.stenyak.com

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Re: [Boost-users] [boost] [serialization] typeid information is not included in archives
by Andrei Popa 19 Dec '07

19 Dec '07

Hi Mahesh, Actually I thought myself about a such solution. But how do you know to what class do you have to cast(dynamic_cast)? That is the Question! You do not know if you are reading in a "Circle" or a "Line"... If the implementation is made using typeid or class name I do not really care. Regards, Andrei _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

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Install: recommended directory for boost-root?
by Michael Fuller 19 Dec '07

19 Dec '07

I'm installing Boost on a Mac (OS 10.5.1). I realize that I could put the libraries just about anywhere, but is there a recommended directory for the Boost root? Some possibilities I've considered include /opt/local/lib/Boost, opt/local/var/Boost, /Library/Boost, / local/bin/Boost, /local/share/Boost ... Where do you normally install your "third-party" libraries and why? Does the recommended location depend on platform (i.e. Linux, Win, Mac)? Thanks! Mike ========================== Michael Fuller, Ph.D. Faculty of Forestry University of Toronto Toronto, ON M5R 3B3 PHONE: (416) 946-0119 EMAIL: mm.fuller(a)utoronto.ca WEB: www.tiem.utk.edu/~mmfuller

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[program_options] Custom storage
by Adam Badura 19 Dec '07

19 Dec '07

Is there a way to add a different storage for program options (different from available: command line, configuration file, environmental variables)? I would like to use this library (or at least try to) however I must store configuration in Windows Registry. Is it possible now? Will it ever be (as it seems to me that it is not possible now)? Adam Badura

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Segmentation fault with wdirectory_iterator
by Adam Panayis 19 Dec '07

19 Dec '07

Hi, I have a similar problem to the one below. http://lists.boost.org/boost-users/2007/12/32679.php When I try to create a wdirectory_iterator on a wpath I get a segmentation fault. Sample code: #include <iostream> #include <boost/filesystem/config.hpp> #include <boost/filesystem/operations.hpp> #include <boost/filesystem/fstream.hpp> #include <boost/program_options.hpp> #include <boost/scoped_array.hpp> main() { boost::filesystem::wpath wp_t2(L"/"); std::locale::global(std::locale("")); boost::filesystem::wdirectory_iterator wd_1(wp_t2); } I am using boost version 1.34.1 on fedora 7. Can anyone help? Thanks Adam

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Boost.Timer in OSX 10.5
by Tom Smith 19 Dec '07

19 Dec '07

Hi, Since upgrading this computer to OSX 10.5 (from Tiger 10.4), I've had weird boost::timer behaviour - jobs taking 50+ hours report as finishing in ~3000s. It seems similar to the problem here (elapsed_max is the problem, basically): http://lists.boost.org/boost-users/2007/09/30661.php The code in that thread gives elapsed_max() as 4294.97 sec on my system. I guess this is a bug the standard library on 10.5, not a Boost bug, but still - any ideas? Thanks, Tom

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[fusion] bug in end_impl for struct_tag
by Roman Perepelitsa 19 Dec '07

19 Dec '07

I've encountered fusion's behavior that seems to be a bug. #include <boost/mpl/assert.hpp> #include <boost/type_traits/is_same.hpp> #include <boost/fusion/sequence/intrinsic/begin.hpp> #include <boost/fusion/sequence/intrinsic/end.hpp> #include <boost/fusion/adapted/struct/adapt_struct.hpp> #include <boost/fusion/iterator/next.hpp> struct s { int m; }; BOOST_FUSION_ADAPT_STRUCT(s, (int, m)) int main() { using namespace boost::fusion; using boost::is_same; typedef result_of::begin<s>::type b; typedef result_of::end<s>::type e; // this fails BOOST_MPL_ASSERT((is_same<result_of::next<b>::type, e>)); } Here is a patch against trunk: Index: end_impl.hpp =================================================================== --- end_impl.hpp (revision 42137) +++ end_impl.hpp (working copy) @@ -8,6 +8,7 @@ #if !defined(BOOST_FUSION_END_IMPL_24122005_1755) #define BOOST_FUSION_END_IMPL_24122005_1755 +#include <boost/fusion/adapted/struct/extension.hpp> #include <boost/fusion/adapted/struct/struct_iterator.hpp> namespace boost { namespace fusion @@ -25,7 +26,7 @@ template <typename Sequence> struct apply { - typedef struct_iterator<Sequence, 2> type; + typedef struct_iterator<Sequence, struct_size<Sequence>::value> type; static type call(Sequence& v) Regards, Roman Perepelitsa.

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How to debug? - Unable to load Boost.Build: could not find build system.
by Chun Tse 19 Dec '07

19 Dec '07

Hello, I've followed the instructions from here: http://www.boost.org/boost-build2/doc/html/bbv2/installation.html I can build from example hello.cpp from: /usr/share/boost-build/example/hello $ bjam ...found 9 targets... ...updating 5 targets... MkDir1 bin MkDir1 bin\gcc-mingw-3.4.5 MkDir1 bin\gcc-mingw-3.4.5\debug gcc.compile.c++ bin\gcc-mingw-3.4.5\debug\hello.o gcc.link bin\gcc-mingw-3.4.5\debug\hello.exe ...updated 5 targets... /usr/share/boost-build/example/hello $ ls Jamroot bin hello.cpp /usr/share/boost-build/example/hello $ find . . ./bin ./bin/gcc-mingw-3.4.5 ./bin/gcc-mingw-3.4.5/debug ./bin/gcc-mingw-3.4.5/debug/hello.exe ./bin/gcc-mingw-3.4.5/debug/hello.o ./hello.cpp ./Jamroot I copy the example directory to my h drive and edit the ../boost-build.jam so it points to the build system: /h/workspace/example/hello $ cat ../boost-build.jam # Copyright 2002, 2003 Vladimir Prus # Distributed under the Boost Software License, Version 1.0. # (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) boost-build /usr/share/boost-build/kernel ; Then I run bjam and get an error saying it can't find bootstrap.jam. /h/workspace/example/hello $ ls Jamroot hello.cpp /h/workspace/example/hello $ bjam Unable to load Boost.Build: could not find build system. --------------------------------------------------------- h:\workspace\example\boost-build.jam attempted to load the build system by invoking 'boost-build /usr/share/boost-build/kernel ;' but we were unable to find "bootstrap.jam" in the specified directory or in BOOST_BUILD_PATH (searching /usr/share/boost-build/kernel, /usr/share/boost-build). Please consult the documentation at 'http://www.boost.org'. bootstrap.jam is contained in /usr/share/boost-build/kernel $ ls -l /usr/share/boost-build/kernel total 18 -rw-r--r-- 1 mtse Administ 194 Dec 19 17:01 boost-build.jam -rw-r--r-- 1 mtse Administ 4287 Dec 19 16:08 bootstrap.jam -rw-r--r-- 1 mtse Administ 10260 Dec 19 16:08 class.jam -rw-r--r-- 1 mtse Administ 7145 Dec 19 16:08 errors.jam -rw-r--r-- 1 mtse Administ 11414 Dec 19 16:08 modules.jam $ env | grep BOOS BOOST_BUILD_PATH=/usr/share/boost-build What could be wrong? How can I debug this? $ bjam -v Boost.Jam Version 3.1.16. OS=NT. Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc. Copyright 2001 David Turner. Copyright 2001-2004 David Abrahams. Copyright 2002-2005 Rene Rivera. Copyright 2003-2005 Vladimir Prus. Michael

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[boost-users] hamming distance.
by chun ping wang 19 Dec '07

19 Dec '07

Hi, are their any library in boost where it can help me count the difference of two list. (i.e. the number of items that difference from each other) also known as hamming distance.

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