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Problem of compiling boost::thread source code from Sun Studio
by Carfield Yim 01 Jul '09

01 Jul '09

Get the following error: "/home/ops/3rdParty/boost/1.38.0/install/include/boost-1_38/boost/thread/detail/thread.hpp", line 344: Error: boost::thread::thread(boost::thread&) is not accessible from boost::move(boost::detail::thread_move_t<boost::thread>). Do I need to upgrade the boost library for this ? -- View this message in context: http://www.nabble.com/Problem-of-compiling-boost%3A%3Athread-source-code-fr… Sent from the Boost - Users mailing list archive at Nabble.com.

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String, vector type with stack-allocated internal array (and dynamic array fallback)?
by Boris Dušek 01 Jul '09

01 Jul '09

Hello, for performance reasons, I would like not to have to have a std::wstring (1 allocation/1 deallocation of its character array) in one routine and instead have a wchar_t[MAXSIZE]. But I also would like my code to be correct for sizes bigger than MAXSIZE. Is there some type (in boost or elsewhere, preferable for both basic_string and vector) that defaults to stack-allocated array of some size (preferably configurable by a template parameter), and in case of overflow (i.e. push_back or insert when it's full), would allocate a dynamically-allocated array? This is how it works on MSVC with their STL basic_string implementation, just the array size is unconfigurable (16 bytes including null-terminating byte). I would obviously choose the MAXSIZE so that 99.9% of cases are handled by the stack-allocated array. Thanks, Boris

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Solved it - Re: How to set include path to boost root (when using bjam)?
by s seelenluft 01 Jul '09

01 Jul '09

> > sorry for this very basic question. Bjam complains about not finding the > boost libraries. This line > #include <boost/mathtools/minima.hpp> > in the header of my code triggers: > > error: boost/math/tools/minima.hpp: No such file or directory I have added: :<include>/usr/local/include/boost-1_39 as suggest on page 6 of: http://www.boost.org/doc/tools/build/doc/userman.pdf into the 'body' of exe 'options' in the Jamroot file inside my project. I had previously tried to add it just at the end that file. My problem was that I was provided with a working Jamroot file (by somebody who has since left my organisation) and thus I was able to work happily without knowing anything about the syntax in it. I was foraging through the boost documentation how to get started with it and only found that little bone: " you need a directory containing the boost/ subdirectory in your #includepath. " in: http://www.boost.org/doc/libs/1_39_0/more/getting_started/unix-variants.html but no documentation of how to actually add a include path (because that is probably obvious to anybody familiar with bjam). And, I am wondering whether I should rather add that line to my /usr/share/boost-build/user-config.jam file but the syntax probably is slightly different there. Markus

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How to set include path to boost root (when using bjam)?
by s seelenluft 01 Jul '09

01 Jul '09

Hi, sorry for this very basic question. Bjam complains about not finding the boost libraries. This line #include <boost/mathtools/minima.hpp> in the header of my code triggers: > error: boost/math/tools/minima.hpp: No such file or directory I have installed bjam, works fine (I was provided with an appropiate Jamroot file). I also have installed the boost libraries (via sudo bjam install --prefix=/usr/local/ --toolset=darwin), installation looks ok. I have added /usr/local/include/boost-1_39/** to the header search paths in Xcode, seems to work except for that '*snprintf' *error message (for which I already found some references). However, when invoking bjam from the command line, I somehow have to tell it the location of the boost root directory. I have found some references saying it should be set in the project's Jamrules file: http://boost.cppll.jp/HEAD/tools/build/v1/build_system.htm http://mail.python.org/pipermail/cplusplus-sig/2006-September/010917.html http://lists.boost.org/boost-users/2004/09/7734.php I have tried to add either of the following two lines to either to the end of my Jamroot file or to a separate Jamrules file (both in my project directory): path-global BOOST_ROOT : /usr/local/include/boost-1_39 ; project boost : /usr/local/include/boost-1_39 ; Adding it the Jamrules file does nothing. Adding them to the Jamroot file produces two different error messages: 'rule path-global unknown' and 'error: Invalid project attribute' I have also considered adding these to /usr/share/boost-build/user-config.jam. Just for kicks, I also added '/usr/local/include/boost-1_39' to my path. I know I have to set the include path somewhere (bjam cannot know what version I am using and thus cannot know the precise path). But I am not sure where exactly and don't really know what to add exactly. Thanks. Markus

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General: Vector UTF
by Etienne Philip Pretorius 01 Jul '09

01 Jul '09

Hello List, This is a general question regarding UTF-8/UTF-16/UTF-32 design implementation. I would appreciate and comments to this design. Create classes of utf8/utf16/utf32 who has a public base of std::vector<char>. Make all the std::vector<char> methods private (proxy like approach without the pointer) to avoid calling the public base directly from code without down casting (And the signatures should be diffrent anyway, see below). Re-implement common vector functions as public methods for unicode manipulation from the derived classes of utf* using boost::uint32_t as the code point type. Allow passing of down casted utf* classes into functions that will handle std::vector<char> types (boost::asio). This should also allow direct manipulation of the underlying data. Good/Bad/Terrible Idea? These classes should only be for the manipulation of code points and not for the extraction of characters (combining character classes etc). Etienne

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[asio] async_read and 100% CPU
by Etienne Philip Pretorius 01 Jul '09

01 Jul '09

Hello list, Could someone please shed some light on this subject. It seems that me read handler keeps on being called even when there has been no data transferred... Here is the accept handler that starts off the read handler (All methods are part of the same class, namely 'client'): /* Accept Handler */ void handle_accept( const boost::system::error_code& error ) { client* c; switch(error.value()) { case boost::system::posix_error::success: { c = new client(); socket.async_receive( boost::asio::buffer( buffer ),boost::bind( &client::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred ) ); break; } case boost::system::posix_error::interrupted: case boost::system::posix_error::connection_aborted: { c = this; break; } default: { throw error; } } acceptor.async_accept( c->socket, boost::bind( &client::handle_accept, c, boost::asio::placeholders::error ) ); }; And here is the read handler.... /* Read Handler */ void handle_read( const boost::system::error_code& error, std::size_t bytes_transferred ) { switch(error.value()) { case boost::system::posix_error::success: { if(bytes_transferred > 0) { std::copy( buffer.begin(), buffer.end(), std::back_insert_iterator<std::string>(data) ); break; } } case boost::system::posix_error::interrupted: { socket.async_receive( boost::asio::buffer( buffer ),boost::bind( &client::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred ) ); return; } default: { throw error; } } //TODO: parse contents.. }; Using epoll interface, as I am running Ubuntu Jaunty. Calling io_service.run() from the main thread. Thank you, Etienne Pretorius.

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Default table size of unordered map
by MeMooMeM 01 Jul '09

01 Jul '09

Hi, What is the default table size of unordered maps in boost? I am trying to figure out how scalable this function is. My guess is that boost assumes a default initial table length. If it is exceeded, it needs to re-create hashes for all entries to grow it, which is costly. I would like to find that threshold... Thanks so much! -- View this message in context: http://www.nabble.com/Default-table-size-of-unordered-map-tp24283133p242831… Sent from the Boost - Users mailing list archive at Nabble.com.

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Python embedding - vector problem
by Tyomich on the AIR 01 Jul '09

01 Jul '09

Hello! I'm currently embedding Python in C++ and now having some problems with std::vector. I used indexing suite to wrap it and work with it in Python like a Python list. But there is a problem: when I copy it in Python style (e.g. a[:] = b) it seems like it copies elements recursively, here is a log of copying: Copy constructor Copy constructor Destructor Copy constructor Copy constructor Copy constructor Destructor Destructor Copy constructor Copy constructor Copy constructor Copy constructor Destructor Destructor Destructor .. This is a real problem when the number of elements is more than 100000, because it takes a long time to finish. Is there anything to do with it? Regards, Chirkov Artyom

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[serialization] Multiple archives in same stream
by Chard 01 Jul '09

01 Jul '09

Pardon me if this issue has been discussed earlier, but is there a particular technical issue why multiple archives cannot be serialized to (or, specifically, de-serialized from) the same stream? (I'm still on 1.38, so slap me if this works with 1.39+). Given the following example: #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/serialization.hpp> void test_ser_app() { { { std::ofstream file("ser.txt"); archive::text_oarchive arch(file); std::string s("Hello World"); arch & s; size_t pos = file.tellp(); // [1] } { std::ofstream file("ser.txt", std::ios::app | std::ios::ate); archive::text_oarchive arch(file); std::string s("Goodbye World"); arch & s; } } // [2] { std::string s1, s2; std::ifstream file("ser.txt"); { archive::text_iarchive arch(file); arch & s1; } size_t pos = file.tellg(); // [3] try { archive::text_iarchive arch(file); arch & s2; } catch (archive::archive_exception &e) { std::cout << e.what() << std::endl; } } } The stream position reported at [1] is (correctly) 42, and examination of the text file (at [2]) shows the two archives serialized okay. However, the stream position at [3] appears to be at the end of the stream. Does the serialization read in a big chunk, regardless of whether it will be processing it all? If I hack in a set stream position at [3], then the library quite happily reads the second archive. Is it possible to have the library leave the stream pointer at the correct end position?

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STLPort Install Before Building Boost 1.39.0
by biolaser 01 Jul '09

01 Jul '09

I'm on Windows XP SP3, msvc71 SP1, and I want to install STLport 5.2.1 before I install/build Boost 1.39.0. The STLport distribution install file (configure.bat) has two options I need help with: "--with-static-rtl" "-with-dynamic-rtl" Does Boost care whether I enable the static (libc.lib family) or whether I enable the dynamic (msvcrt.lib family) C/C++ library when linking with STLport? Then, there is the "-use-boost <boost install path>" option - I assume I should use this STLport option for Boost 1.39.0 - correct? Finally, is there anything I need to do in my building/installing of Boost itself to make sure it knows I have STLport installed? Thanks much! William Stroupe

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