- Boost-users - lists.boost.org

Using threads without RTTI enabled
by Rick Meier 14 Nov '08

14 Nov '08

Is there some way to use threads without needing rtti? To be more specific it looks like threads.hpp includes function_base.hpp and lexical_cast.hpp. Both of these files reference typeid. Is there something I can do to get around this? Thanks Rick M

1 0

[Proto] Functions returning an expression
by Joel Falcou 14 Nov '08

14 Nov '08

I have a DSL defined in proto. What's the best wayt o build functions that returns an expression made of this DSl elements. Like let's say the vec_expr class support+-*/ operators I want to write ??? f( vec_expr<W> const& a, vec_expr<Y> const& b) { return (a+b)/(a-b); } How can I easily (aka no nested make_expr call) build the return type ? TIA -- ___________________________________________ Joel Falcou - Assistant Professor PARALL Team - LRI - Universite Paris Sud XI Tel : (+33)1 69 15 66 35

2 4

Always have posting & responding to messages here
by Jeff Dunlap 14 Nov '08

14 Nov '08

First, I would like to thank the kind individuals who have helped me in the past--I can never thank anyone because I simply cannot respond to messages. This web interface never seems to show up to date information so messages that I post via the web interface do not appear on the web interface for some weird reason, no matter if I choose the refresh dropdown option or go to the home page and navigate to this group. I am able to see current messages via outlook express, but cannot post using it unfortunately. Is this just the way this works or are there other options available for posting/reading? Thanks in Advance

2 2

Re: [Boost-users] boost signals2 review
by Stjepan Rajko 14 Nov '08

14 Nov '08

Thank you, Andy, for the review. Stjepan On Mon, Nov 10, 2008 at 9:18 AM, Andrew Webber <andy(a)aligature.com> wrote: > For this review, I have focused on the usability and documentation of the > new signals2 library. I haven't really probed into the implementation and > so I'm assuming that the code is adequate and mostly bug free. > > In general, I think that this library should be accepted as a boost > library. Other than a few questions and annoyances, I think the library is > an extremely welcome addition to the boost libraries. > > I think that the interface changes required to guarantee thread safety are > understandable. I've seen some discussion on the mailing list about > retaining the trackable interface for backwards compatibility. While I > understand the desire to keep the changes required by switching to signals2 > to a minimum, I think signals2 provides a clean break. I understand > boost::signals is going to be maintained for the time being. This way, if > people don't want to change, they don't need to for the time being. If they > want thread safe signals, they should switch to the new library, its new > techniques and its clean interface. > > Here are my specific comments: > * Why the change to boost::optional for signal return values. Maybe I > missed a discussion about the motivation on the mailling list, but this is > an interface change that appears to be unnecessary. > > * I would like to see examples provided to explain the use of > postconstructable, predestructable, and deconstruct_ptr. I think a concrete > example might clear up some people's confusion over when it's appropriate to > use these. > > * I'd also like to see a concrete example shown of switching out the mutex > class used. I think three examples would be best: built-in, dummy_mutex, > and boost::mutex. > > * I'm not very happy about the tendancy of the slot disconnect exceptions > to show up in Visual Studio output. For instance, I built a test program > where several tracked objects were destroyed from different threads, based > on a random timer, while the slot was being invoked over and over. The > program worked well except for a great deal of repeated output like the > following: > > First-chance exception at 0x7c812a5b in SignalsTest.exe: Microsoft C++ > exception: > boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::bad_weak_ptr> >> at memory location 0x0012dc0c.. > First-chance exception at 0x7c812a5b in SignalsTest.exe: Microsoft C++ > exception: boost::signals2::expired_slot at memory location 0x0012df58.. > > > I did several experiments with this library on Microsoft Visual Studio > 2005. I did not encounter any bugs or problems during my testing. I have a > decent amount of experience in this problem domain. In the past, I have > implemented a (limited) thread safe wrapper around the boost::signals > library. The signals2 library would very effectively replace my wrapper. I > spent a couple of hours on my evaluation, I would consider it moderately > in-depth without evaluating the signals2 implementation. > > Best, > Andy Webber > >

3 2

Problem at the asynchronous TCP Server example
by Daniel França 14 Nov '08

14 Nov '08

Hi everyone, I'm new at this list and new using the boost library. I'm little by little learning about boost. Now I was trying to do this example: http://www.boost.org/doc/libs/1_36_0/doc/html/boost_asio/tutorial/tutdaytim… The source is here: http://www.boost.org/doc/libs/1_36_0/doc/html/boost_asio/tutorial/tutdaytim… But when I try to link I get this errors: /usr/include/boost/system/error_code.hpp undefined reference to `boost::system::get_posix_category()' The program is linking with the follows boost librarys: boost_filesystem-gcc42-mt boost_system-gcc42-mt boost_unit_test_framework-gcc42-mt Maybe I forgot something when I did compile boost? My version of boost is 1.36. I use Linux (Slackware 12.1 + KDE 4.1), gcc 4.2.3 and Eclipse+CDT Best Regards -- Daniel C. França Tecnosapiens: http://tecnosapiens.wordpress.com 24Quadros: http://24quadros.wordpress.com -- Daniel C. França Tecnosapiens: http://tecnosapiens.wordpress.com 24Quadros: http://24quadros.wordpress.com

1 0

Problem with Serialization and Intel 10.0.023
by Steve Nolen 14 Nov '08

14 Nov '08

2 1

BOOST_MPL_LIMIT_SET_SIZE
by peter_foelsche＠agilent.com 14 Nov '08

14 Nov '08

I just run into the basic limitation of 20. This has direct consequences on one of our products. Currently the highest number I've seen is 31, but our customers are likely to create higher numbers. (We generate C++ code in one of our products). It would be ok to limit it to 50 -- which is what boost provides. But what would it take to increase this limit? The matching files in boost/mpl are kind of unreadable for the uninitiated. Or is there a given limit for any compiler? Anybody any clue? Thanks Peter "The first point (using an init() function in preference to a constructor) is bogus. Using constructors and exception handling is a more general and systematic way of dealing with resource acquisition and initialization errors. This style is a relic of pre-exception C++." -- Stroustrup

2 1

[Asio - SSL] Public and Private Keys
by Mario Chacon 13 Nov '08

13 Nov '08

I need to generate public and private keys with OpenSSL. I tried to do it with the following tutorial: http://aionskia.com/boostasio.html, using the example that comes with Windows boost but it did not work. With the keys coming at the example works correctly. Could help generate these keys? (Must run on Windows and Linux) Thx, Mario

2 3

[BGL] Problem when compiling bgl with boost1.37
by Pablo Minguez 13 Nov '08

13 Nov '08

Hi, I have a problem when trying to compile bgl and boost, maybe someone can help, thanks in advance. I am trying to install boost (boost1.37) and bgl python bindings (bgl-python-0.9) in some machines and it gives me an error when compiling: etch-386:/usr/src/bgl-python-0.9# /usr/src/boost_1_37_0/tools/jam/src/bin.linuxx86/bjam --pythonlibdir=/usr/lib/python2.4/site-packages/ --exec-prefix=/usr/ install error: Could not find parent for project at '.' error: Did not find Jamfile.jam or Jamroot.jam in any parent directory. I have used these versions before and everything was fine, I have no clue why now it doesn't work, the new machines are 64 bits, perhaps that is the clue? In order to solve the problem I tryied to compile boost_1_37_0 and another version of bgl: bgl-python from subversion (svn co https://svn.osl.iu.edu/svn/projects_viz/bgl-python) Everything was fine here at this step but when running my scripts they give me an error in the generation of the Graph object: ERROR: Traceback (most recent call last): File "testing_bgl.py", line 403, in ? sh_xml = run_shortest_paths_file(intfile,limit,proteins) File "testing_bgl.py", line 320, in run_shortest_paths_file interactome = Interactome() File "testing_bgl.py", line 23, in __init__ self.weights = self.graph.edge_properties['weight'] = self.graph.edge_property_map('float') AttributeError: 'Graph' object has no attribute 'edge_property_map' This script was working before, any idea of why the edge_property_map attribute cannot be set up in this version of bgl?? So, concluding, any clues for solving either the compilation problem or the python error??? Many thanks!! Pablo -- --------------------------------------------- Pablo Mínguez Paniagua PhD Student Bioinformatics Departament Centro de Investigación Príncipe Felipe (CIPF). Av. Autopista del Saler 16, 46013, Valencia, Spain Phone: +34 96 328 96 80 ext:1021 http://bioinfo.cipf.es/

3 3

[boost-users] VC2005 - strange bug (when specializing base template)
by Igor R 13 Nov '08

13 Nov '08

Hello, This is not a boost-related issue (except the fact that enable_if is used), but it might be of interest to the boost-users community. The following bug was detected in some compicated environment, but the following seems to be the minimal construct where it appears (compile in Debug mode; see comments in Test::func() ). // main.cpp #include <boost/type_traits/is_integral.hpp> #include <boost/utility.hpp> class BasicVersion {}; template<typename Param, class Enable = void> class Version1 : public BasicVersion { protected: Version1() : verData_(2) {} void go() { verData_ = 3; } int verData_; }; template<typename Param, class Enable = void> class TestBase {}; template<typename Param> class TestBase<Param, typename boost::enable_if<boost::is_integral<Param> >::type> : public Version1<Param> {}; template<class Param> class Test : private boost::noncopyable, public TestBase<Param> { public: void func() { go(); // This works well TestBase::go(); // This jumps to an incorrect place (bad "this"), verData_ contains garbage /* the following code is generated for the previous 2 calls: go(); 004116D3 mov ecx,dword ptr [this] 004116D6 add ecx,4 004116D9 call Version1<int,void>::go (4110F5h) TestBase::go(); 004116DE mov ecx,dword ptr [this] 004116E1 add ecx,8 004116E4 call Version1<int,void>::go (4110F5h) */ } private: int data_; }; int main() { Test<int> test; test.func(); }

1 0