November 2008 - Boost-users - lists.preview.boost.org

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

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[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

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[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/

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[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(); }

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Re: [Boost-users] Boost Static Linking Woes
by Brian Dawn 13 Nov '08

13 Nov '08

Hello everyone, I am sorry, I did not explain my situation as well as I should have. I have a complete build of boost installed so I had assumed it created static libraries alongside dynamic ones. When I received the "Mixing a dll boost library with a static runtime is a really bad idea..." message I had assumed autolink was to blame because I had assumed it would recognize the static install and thus search for the static libraries. When I disabled autolink I directly linked to "libboost_whatever.lib" as those are the static libraries correct? However that's when I received the heap corruption. As for the macros... I checked my user & config files, and BOOST_ALL_DYN_LINK was commented out. >> That suggests a build problem somewhere: do you still have BOOST_ALL_DYN_LIB defined or something? By still, do you mean that it is defined by default? Because I had never undefined it. Does boost complete build both static and dynamic libraries? Because maybe that is my problem. I appreciate everyone's help. Thanks, -Brian.

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Re: [Boost-users] Bind and overloaded operators in Visual Studio 2008
by Benjamin Swerts 13 Nov '08

13 Nov '08

> The bug you're seeing is in Dinkumware's bind, not boost's. > Try using boost::bind explicitly and I suspect it will work fine. Thanks for the quick answer. I replaced it with #include <boost/bind.hpp> std::find_if(v.begin(), v.end(), boost::bind( &Foo::first_, _1 ) == test ); which works. I did, however, configure Visual Studio to prefer Boost's TR1 implementation by adding the following include directories before the Microsoft includes (Tools->Options->Projects and Solutions->VC++ Directories->Include files): - boost-root/boost/tr1/tr1 - boost-root This worked as expected with VS2005 but with VS2008 the Microsoft/Dinkumware includes are apparently still preferred. Greets, Ben

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Re: [Boost-users] I have a crash when I included serialization in my Mixed C++ project
by Raj Prasan 13 Nov '08

13 Nov '08

Thanks it worked. Looks like Microsoft has not fixed it in VS 2008 also. I went to project properties > linker settings > advanced and changed entry point from "main" to "?mainCRTStartupStrArray@@$$FYMHP$01AP$AAVString@System@@@Z" I appreciate your help very much. You have saved me a lot of time.

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us_dst_rules::dst_start_offset -- version change issue?
by Joseph A. Marks 12 Nov '08

12 Nov '08

We recently upgraded to Boost 1_36_0. The following line used to compile correctly: boost::posix_time::time_duration td = us_dst_rules::dst_start_offset(); However, now I get the following error: error C2039: 'dst_start_offset' : is not a member of 'boost::date_time::us_dst_rules<date_type_,time_duration_type_>' Does anyone have any insight on how to correct this issue? Joseph A. Marks

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[function] Automatic boost::ref for functors?
by Robert Dailey 12 Nov '08

12 Nov '08

Hi, I noticed in the Boost.Function documentation here that it explains how to pass a reference to a function object into a boost::function. Is there a way to make boost::function automatically take the reference of any function object it is given? For example: boost::function<void (int)> f; f = MyFunctionObject(); // This is an implicit: f = boost::cref( MyFunctionObject() ); Help is appreciated!

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Bind and overloaded operators in Visual Studio 2008
by Benjamin Swerts 12 Nov '08

12 Nov '08

Hello everyone, This is my first post to this list so apologies in advance for all the rules I will be breaking. I have a problem using overloaded operators in Visual Studio 2008 SP1 (no feature pack installed) with Boost version 1.36.0. The following code works perfectly in Visual Studio 2005: ////////// #include <algorithm> #include <functional> #include <vector> struct Foo { Foo(unsigned int first, unsigned int second) : first_(first), second_(second){}; unsigned int first_; unsigned int second_; }; int main(int, char*) { std::vector<Foo> v(10, Foo(1, 2)); const unsigned int test = 1; std::find_if(v.begin(), v.end(), std::tr1::bind( std::equal_to<unsigned int>(), std::tr1::bind(&Foo::first_, std::tr1::placeholders::_1), test)); std::find_if(v.begin(), v.end(), std::tr1::bind( &Foo::first_, std::tr1::placeholders::_1 ) == test ); return 0; } ////////// The 2 find_if calls have the exact same behaviour. If I compile this with 2008, I get the following errors for the second find_if call: .\main.cpp(19) : error C2784: 'bool std::tr1::operator ==(std::tr1::_Unutterable,const std::tr1::function<_Fty> &)' : could not deduce template argument for 'const std::tr1::function<_Fty> &' from 'const unsigned int' C:\Program Files\Microsoft Visual Studio 9.0\VC\include\../include/functional(1100) : see declaration of 'std::tr1::operator ==' .\main.cpp(19) : error C2784: 'bool std::tr1::operator ==(const std::tr1::function<_Fty> &,std::tr1::_Unutterable)' : could not deduce template argument for 'const std::tr1::function<_Fty> &' from 'std::tr1::_Bind<_Ret,_BindN>' with [ _Ret=std::tr1::_Notforced, _BindN=std::tr1::_Bind1,std::tr1::_Ph<1>> ] C:\Program Files\Microsoft Visual Studio 9.0\VC\include\../include/functional(1094) : see declaration of 'std::tr1::operator ==' .\main.cpp(19) : error C2784: 'bool std::tr1::operator ==(const std::tr1::shared_ptr<_Ty> &,const std::tr1::shared_ptr<_Ty2> &)' : could not deduce template argument for 'const std::tr1::shared_ptr<_Ty> &' from 'std::tr1::_Bind<_Ret,_BindN>' with [ _Ret=std::tr1::_Notforced, _BindN=std::tr1::_Bind1,std::tr1::_Ph<1>> ] C:\Program Files\Microsoft Visual Studio 9.0\VC\include\../include/memory(1598) : see declaration of 'std::tr1::operator ==' .\main.cpp(19) : error C2676: binary '==' : 'std::tr1::_Bind<_Ret,_BindN>' does not define this operator or a conversion to a type acceptable to the predefined operator with [ _Ret=std::tr1::_Notforced, _BindN=std::tr1::_Bind1,std::tr1::_Ph<1>> ] I have honestly no idea what I should do to fix this. Mailing list and google searches turned up nothing so any help would be much appreciated. TIA, Ben ------------------------- Ben Swerts Software engineer ICOS Vision Systems NV -------------------------

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