- Boost-users - lists.boost.org

Something simple is wrong I am sure
by Daniel Lord 09 Nov '07

09 Nov '07

OS X 10.5 Macbook Pro (Intel Dual Core x86) Boost builds and installs fine (except for Unicode Regex) and recognizes the toolset is Darwin. $./configure -n Building Boost.Jam with toolset darwin... tools/jam/src/bin.macosxx86/bjam -n Detecting Python version... 2.5 -n Detecting Python root... /Library/Frameworks/Python.framework/Versions/2.5 -n Unicode/ICU support for Boost.Regex?... not found. Backing up existing Boost.Build configuration in user-config.jam.4 Generating Boost.Build configuration in user-config.jam... Generating Makefile... and make and install proceeded fine. So I tried the examples on the "Getting Started Page" First one works fine. Second one (using the regex libraries does not): "ld: warning in /usr/local/lib/libboost_regex-mt-d.a, file is not of required architecture Undefined symbols: "boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >::maybe_assign(boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > const&)", referenced from: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::basic_string<cha" So how can this be? The build was for Darwin and yet its the wrong architecture?!?!?! I don't understand the error messages frankly.

2 1

Re: [Boost-users] shared_ptr and covariant return types
by lists.boost.org＠xmlizer.biz 09 Nov '07

09 Nov '07

Hi Ovanes Thanks for your reply. Yes, I understand that do_clone is private. I wonder what Peter Dimov's idea is. I believe the point of this free function would be that you would only need to write it once and use it for any class that provides the do_clone() method. Which I'd love to see in action. Or be proven wrong. Thanks Bernhard On Thu, 8 Nov 2007, Ovanes Markarian wrote: > Hi! > > do_clone is really private ;) Your derived class has public clone > member and you should use it from the free function, but no the > do_clone. > > > Regards, > Ovanes > > > > On 8 Nov 2007 14:53:49 +0100, Bernhard Wagner boost > <lists.boost.org(a)xmlizer.biz> wrote: > In this post Peter Dimov shows a solution for the covariant return type > problem when using shared_ptr: > http://lists.boost.org/boost-users/2003/02/2996.php > > I'm interested in the free function solution he provides: > > > [snip] you can use the usual pattern from the no-covariant-return > days: > > > > class B > > { > > virtual shared_ptr<B> do_clone() const = 0; > > }; > > > > class X: public B > > { > > virtual shared_ptr<B> do_clone() const { return shared_ptr<X>(new > > X(*this)); } > > > > public: > > > > shared_ptr<X> clone() const > > { > > shared_ptr<X> px = dynamic_pointer_cast<X>(this->do_clone()); > > assert(px); > > return px; > > } > > }; > > > > It buys you some extra safety, too. > > > > You could also use a free function: > > > > template<class X> shared_ptr<X> clone(X const & x) > > { > > > > shared_ptr<X> px = dynamic_pointer_cast<X>( x.do_clone()); > > assert(px); > > return px; > > } > > > > So, to clone an object using the clone method, I could use: > > X* x; > shared_ptr<X> spX(x = new X()); > shared_ptr<X> spX2 = spX->clone(); > // or: > shared_ptr<X> spX3 = x->clone(); > > But how is the free function meant to be used? > > This provokes the compiler error: '... do_clone() const is private ...': > shared_ptr<X> spX4 = clone(*spX); > > Thank you > Bernhard > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > -- Bernhard Wagner bernhard.wagner(a)iaeth.ch Milchbuckstr. 14 VOICE +41-1-364 50 03 CH-8057 Zurich, Switzerland http://listen.to/bernard

1 0

[asio] Problems with Boost.System
by Damjan Miklic 08 Nov '07

08 Nov '07

Hi, I am running into some problems when trying to build a simple Asio program (the Timer2 tutorial) with MSVC 8.0. I have installed Boost using the installer from Boost Consulting and copied the Asio headers to the boost_1_34_1\boost directory. The program compiles (with three warnings about deprecated unsafe functions in asio headers) but linking fails with the error: fatal error LNK1104: cannot open file 'libboost_system-vc80-mt-sgd-1_34_1.lib' I have tried building Boost.System with the command: bjam --with-system stage according to the instructions found on: http://asio.sourceforge.net/boost_asio_0_3_8/libs/asio/doc/html/boost_asio/… but i get the following error: error: wrong library name 'system' in the --with-<library> option. I have searched the Boost website and mailing list archives but couldn't find any further information on building the System library. Any help in resolving this problem will be greatly appreciated. Best Regards, Damjan Miklic

2 1

Boost.preprocessor Minor Update for 1.34.1
by Andry 08 Nov '07

08 Nov '07

Hello boost-users, You can download sources here: https://sourceforge.net/project/showfiles.php?group_id=198908&package_id=24… Main idea of this update is to add new macros BOOST_PP_MACRO_IF/BOOST_PP_MACRO_IIF to use BOOST_PP_IF/BOOST_PP_IIF more complex when i need to pass in multiple arguments like what: /////////////////////////////////////////////////////////////////////////////// //The same as BOOST_PP_IDENTITY, but different #define MY_PP_EVAL1(x1) x1 #define MY_PP_EVAL2(x1,x2) x1,x2 #define MY_PP_EVAL3(x1,x2,x3) x1,x2,x3 #define MY_PP_EVAL4(x1,x2,x3,x4) x1,x2,x3,x4 #define MY_PP_EVAL5(x1,x2,x3,x4,x5) x1,x2,x3,x4,x5 #define MY_PP_EVAL6(x1,x2,x3,x4,x5,x6) x1,x2,x3,x4,x5,x6 #define n 0 //basically is argument of another macro // if n == 0 -> //1,2; // if n != 0 -> //1,2,3; BOOST_PP_MACRO_IF(n, (1,2,3), (1,2), MY_PP_EVAL3, MY_PP_EVAL2); //More complex usage // if n == 0 -> //1,2; // if n == 1 -> //-1,0,1,2,3; // if n > 1 -> //-1,0,1,2,3,4; BOOST_PP_MACRO_IF(n, (-1,0, BOOST_PP_MACRO_IF(BOOST_PP_GREATER(n,1), (1,2,3,4), (1,2,3), MY_PP_EVAL4, MY_PP_EVAL3)), (1,2), BOOST_PP_IF(BOOST_PP_GREATER(n,1), MY_PP_EVAL6, MY_PP_EVAL5), MY_PP_EVAL2); /////////////////////////////////////////////////////////////////////////////// I uses it to properly generate template classes implementations. PS: This is slightly different than BOOST_PP_IF(n, BOOST_PP_IDENTITY(x), BOOST_PP_EMPTY)() cause x can have multiple values and used as an expression to subsequent macro. -- Best regards, Andry mailto:andry@inbox.ru

1 0

[Boost Interprocess] - Shared Memory - Dynamic memory size
by Srinivas Gardas 08 Nov '07

08 Nov '07

Hi, Is there any option to automatically increase the size of the 'Shared Memory' dynamically, in the shared memory objects of Interprocess library? Thanks & Regards, Srinivas Gardas

2 1

[Boost Users] Serialization: problems when splitting serialize into load / save
by Oliver Kania 08 Nov '07

08 Nov '07

Hello out there ! I have an urgent problem concerning boost::serialize. I have split the serialize operation into save / load as described in the tutorial: =================================================== template<class Archive> void save( Archive &ar, unsigned int version) { m_offlineMode = true; // we cannot load more when offline --> always cachedAll bool oldCachedAll = m_CachedAll; m_CachedAll = true; ar & m_CachedAll; ar & m_offlineMode; // do not serialize the lock -- use the default constructor. // we assume that no iterators that lock the cache do exist when serializing. // ar & m_Lock; ar & m_LookupId; ar & m_LookupName; ar & m_SequenceNumber; //reset old state for the case we want to continue working m_CachedAll = oldCachedAll; m_offlineMode = false; } template<class Archive> void load( Archive &ar, unsigned int version) { ar & m_CachedAll; ar & m_offlineMode; // do not serialize the lock -- use the default constructor. // we assume that no iterators that lock the cache do exist when serializing. // ar & m_Lock; ar & m_LookupId; ar & m_LookupName; ar & m_SequenceNumber; //reset old state for the case we want to continue working } BOOST_SERIALIZATION_SPLIT_MEMBER() =============================================================== The class I serialize is part of a deep class hierarchy that I want to serialize as a whole. With the standard serialize() it seems to work, but now the compiler complains ( when I want to perform the actual serialization): error C2662: 'void jedox::palo::AbstractCache<C,Exception>::save<Archive>(Archive &,unsigned int)' : cannot convert 'this' pointer from 'const jedox::palo::AbstractCache<C,Exception>' to 'jedox::palo::AbstractCache<C,Exception> &' AbstractCache is the class containing the above load / save operations kind regards, Oliver

6 7

[reflection] Compilation errors
by Christian Henning 08 Nov '07

08 Nov '07

Hi there, I just pulled the latest reflection code from the sandbox and tried to compile the example. But unfortunately there are compilation errors. For example: c:\boost-sandbox\boost\extension\impl\library_impl.hpp(37) : error C2664: 'LoadLibraryW' : cannot convert parameter 1 from 'const char *' to 'LPCWSTR' Is the relection lib in a usable stage? Thanks, Christian

6 10

shared_ptr and covariant return types
by Bernhard Wagner boost 08 Nov '07

08 Nov '07

In this post Peter Dimov shows a solution for the covariant return type problem when using shared_ptr: http://lists.boost.org/boost-users/2003/02/2996.php I'm interested in the free function solution he provides: > [snip] you can use the usual pattern from the no-covariant-return days: > > class B > { > virtual shared_ptr<B> do_clone() const = 0; > }; > > class X: public B > { > virtual shared_ptr<B> do_clone() const { return shared_ptr<X>(new > X(*this)); } > > public: > > shared_ptr<X> clone() const > { > shared_ptr<X> px = dynamic_pointer_cast<X>(this->do_clone()); > assert(px); > return px; > } > }; > > It buys you some extra safety, too. > > You could also use a free function: > > template<class X> shared_ptr<X> clone(X const & x) > { > > shared_ptr<X> px = dynamic_pointer_cast<X>(x.do_clone()); > assert(px); > return px; > } > So, to clone an object using the clone method, I could use: X* x; shared_ptr<X> spX(x = new X()); shared_ptr<X> spX2 = spX->clone(); // or: shared_ptr<X> spX3 = x->clone(); But how is the free function meant to be used? This provokes the compiler error: '... do_clone() const is private ...': shared_ptr<X> spX4 = clone(*spX); Thank you Bernhard

2 1

bgl-python installation problem
by Pablo Minguez 08 Nov '07

08 Nov '07

Hi, I'm having problems installing the python bindings for boost libraries, what I would like to use is boost.graph but from python. Boost is ok (programs and headers) but when trying to run bjam I have this error: [root][mem01][~/progs/bgl-python-0.9]# bjam error: Could not find parent for project at '.' error: Did not find Jamfile or project-root.jam in any parent directory. Is any other configuration required? Any help is welcome, many thanks in advance. 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: 1011) http://bioinfo.cipf.es/

1 0

hashing a string
by Mark Wyszomierski 08 Nov '07

08 Nov '07

Hi, I'm trying to hash a string, something like: 1) Take string (password) from user 2) Hash it 3) Store to disk I see boost has some hashing features, but am not quite sure how they work. Do they do this type of thing? I'm looking for some really simple hashing, this is just for a simple application. Thanks

6 5