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Re: [Boost-users] serialization and ::copyFrom
by Andrei Popa 26 Mar '08

26 Mar '08

Hi, First of all, thanks for that "NEW" remark, this is an important information for me. It is not about the D2, I do not intend to copy data from an object of a type into an object of an other type. ar << d1; ar >> bp;// but "bp" points already to an object of type D1 I'm trying to read in data from archive into the object pointed by bp. Is this possible? If not. What other possibilities do I have? Any workaround? Thanks, Andrei _________________________________________________________________ Connect to the next generation of MSN Messenger http://imagine-msn.com/messenger/launch80/default.aspx?locale=en-us&source=…

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Linking problem with Borland C++ 5.6
by Sergey.Tsyrulnikov＠t-systems.com 26 Mar '08

26 Mar '08

I try to compile a simple thread_group-example with Borland C++ 5.6 for Win32. I get the following link error: Error: Unresolved external 'boost::thread_group::create_thread(const boost::function0<void, std::allocator<boost::function_base> >&)' referenced from C:\BACPP\SERVICEADAPTER\SRC\SERG.OBJ I have built the boost_thread-bcb-mt-1_34_1.lib with Bjam and Borland. The examples can be created with the library. The MSVC-Variant works without errors. Link-Call: C:\Programme\Borland\CBuilder6\BIN\ILINK32 -Tpe -r -ap -Gn C:\Programme\Borland\CBuilder6\lib\C0X32.OBJ /v -L..\..\Extern\BCB582\BDP\lib -L..\ ..\Xerces\lib\BCB582 -L..\..\Boost\lib\BCB582 -L..\..\LogEngineBA\lib\BCB582 -LC:\Programme\Borland\CBuilder6\lib serg.obj /LIBPATH:..\..\Extern\BC B582\BDP\lib orb_br.lib vdlog_br.lib vport_br.lib /LIBPATH:..\..\Xerces\lib\BCB582 xerces-bor_2_7_0.lib /LIBPATH:..\..\Boost\lib\BCB582 boost_thread-b cb-mt-1_34_1.lib /LIBPATH:..\..\LogEngineBA\lib\BCB582 LogEngine.lib C:\Programme\Borland\CBuilder6\lib\import32.lib C:\Programme\Borland\CBuilder6\li b\cw32mti.lib , serg.exe Turbo Incremental Link 5.60 Copyright (c) 1997-2002 Borland Error: Unresolved external 'boost::thread_group::create_thread(const boost::function0<void, std::allocator<boost::function_base> >&)' referenced from C:\BACPP\SERVICEADAPTER\SRC\SERG.OBJ RLINK32 Version 6.00 (c) Copyright 1992-2002 Borland Software Corporation. Source: #include <iostream> #include <stdio> #include <boost/thread/thread.hpp> #include <boost/bind.hpp> #include <boost/smart_ptr.hpp> #include <vector> using namespace std ; void doCallThreads(std::string text){ printf("Start Thread .......%s\n", text); } void doCallThreadsXXX(){ printf("Start Thread .......\n"); } void doCallsWithThreads(const int countThreads){ // std::vector<boost::thread *> threads; boost::thread_group threads; for(int i = 0; i<countThreads; i++){ //threads.create_thread(boost::bind(doCallThreads, "hhh")); threads.create_thread(&doCallThreadsXXX); // threads.create_thread(&doCallThreadsXXX); printf("Thread %d gestartet\n", (i+1)); } printf("All threads started\n"); // Warten bis alle thread fertig sind threads.join_all(); printf("All threads stopped\n"); } int main(int argc, char* const* argv) { try { doCallsWithThreads(5); cout << "ENDE" << endl ; } catch(std::exception ex) { cout << "Error: " << ex.what() << endl ; throw; } catch(...) { cout << "Error" ; throw; } return 0 ; } Any idea?????

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[boost] [Graph] need help on remove_vertex ....
by Bernhard Lippmann 26 Mar '08

26 Mar '08

Hi, I need some help on the remove_edge, remove_vertex functions. What is wrong with my two functions, removing edges or vertex from a graph with a given name in the coressponding property map. pls. see code snippet after calling my function a second time I get a run time error. I did the code as shown under http://www.boost.org/libs/graph/doc/adjacency_list.html but I feel the rebuild of the vectors did not work, any input is welcome Best Bernhard this is the code in the main program: // ok MyElementList.RemoveVertexByName("vss!",g, VertexNamesMap); // now the run time error ... MyElementList.RemoveVertexByName("vss!s",g, VertexNamesMap); this is the called sub routine: /*$ **************************************************************************** ** Method Name RemoveVertexByName ()... Parameters std::string AE_Name Return long , Index in Map Description remove vertex with a given name see http://www.boost.org/libs/graph/doc/adjacency_list.html for troubles **************************************************************************** ****** */ void TElementList::RemoveVertexByName(std::string elementname, TGraph &g, TVertexNameMap &VertexNamesMap) { Tvertex_iter vi, vi_end, next; tie(vi, vi_end) = vertices(g); for (next = vi; vi != vi_end; vi = next) { ++next; if (VertexNamesMap[*vi] == elementname) { remove_vertex(*vi, g); } } } /*$ **************************************************************************** ** Method Name RemoveEdgeByName () Parameters std::string AE_Name Return long , Index in Map Description Removes the edge (u,v) from the graph. void remove_edge(vertex_descriptor u, vertex_descriptor v, adjacency_list& g) void remove_edge(edge_descriptor e, adjacency_list& g) **************************************************************************** ****** */ void TElementList::RemoveEdgeByName(std::string elementname, TGraph &g, TEdgeNameMap &EdgeNamesMap) { Tedge_iter xei, xei_end; for (tie(xei, xei_end) = edges(g); xei != xei_end; ++xei) { Tedge_descriptor e = *xei; if (EdgeNamesMap[e] == elementname) { remove_edge (e,g); } // Tvertex_descriptor u = source(e, g), v = target(e, g); // if .... (option 29 } } No virus found in this outgoing message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.8/1339 - Release Date: 22.03.2008 16:43

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vertex_descriptor NULL check
by Hardik Kheskani 26 Mar '08

26 Mar '08

I am using adjacent lists and using vertex_descriptors. Is there a way to check if the vertex_descriptor is NULL or 'not assigned' yet? graph_traits < adjacent_list_graph >::vertex_descriptor vd ; can I assign this to NULL ? and can I use vd == NULL or vd != NULL ? Any help/info is greatly appreciated. Hardik True religion is real living; living with all one's soul, with all one's goodness and righteousness. -Albert Einstein I got a simple rule about everybody. If you don't treat me right shame on you! -Louis Armstrong ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

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[mpl] Sorting types by index
by Scott Meyers 26 Mar '08

26 Mar '08

I have an mpl::vector of all possible types I care about. It's called AllTypes. Given a sequence containing some subset of types in AllTypes, I want to order the sequence so that the types occur in the same relative order as in AllTypes. So if AllTypes is A, B, C, D, E and I'm given B, E, A I want to produce A, B, E Fundamentally, I'm sorting things based on their index in AllTypes. Well, that's what I want to be doing. What I'm really doing is getting compilation errors referring to a missing tag in my metafunction, which is called IndexOf. The code I'm using is below. I'd appreciate it if people would take a look and help me figure out why it's not working. Thanks, Scott #include <boost/mpl/sort.hpp> #include <boost/mpl/distance.hpp> #include <boost/mpl/find.hpp> using namespace boost; // return the index of type T in sequence S template<typename S, typename T> struct IndexOf { enum { value = mpl::distance<typename mpl::begin<S>::type, typename mpl::find<S, T>::type >::value }; }; int main() { using mpl::_1; using mpl::_2; typedef mpl::vector<char, short, int, long, float, double> AllTypes; typedef mpl::vector<long, char, short> Unsorted; typedef mpl::sort<Unsorted, // this call to mpl::less<IndexOf<AllTypes,_1>, // sort doesn't IndexOf<AllTypes,_2> > // compile >::type Sorted; }

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Is boost a library or a framework?
by Robert Dailey 26 Mar '08

26 Mar '08

Hi, My head has been spinning lately on trying to nail down the difference between a library and a framework. One of my co-workers calls Boost a framework because it is a collaboration of components, and the fact that boost is so large makes it a framework. However, boost boasts itself as a library and I'm just wondering why it is such. One definition I read for a framework is that it has no requirement to be minimal, and boost is a fairly un-minimal library. Read the link below on an interesting conversation between the differences in a library and a framework: http://www.artima.com/forums/flat.jsp?forum=106&thread=152104

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serialization and ::copyFrom
by Andrei Popa 25 Mar '08

25 Mar '08

Hi there, I have a small hierarchy of classes that are serializable. I wanted to implement in base class a ::copyFrom method that can copy any data from a pointer to "this" object. The idea behind was to save the "from" pointed object to an archive and then restore the saved data in "this". Saving the input pointer was not a problem but restoring the data in "this" object was a really problem. Since loading *this will call ::load of a base class, I created an temporary shared_ptr around "this". This way the appropriate ::load of the derived class was called. But unfortunately after executing "iarchive >> p;" the px of p doesn't point anymore to "this". I don't know why? Basic code looks like: baseClass::copyFrom (const BaseClass* from) { //save *from //restore the saved data in "this" boost::shared_ptr<baseClass> p(this, baseClass::pseudo_deleter()); iarchive >> p; } pseudo_deleter dose nothing. Does anybody know way this happen? Has anybody a better idea how to implement this method? I tried also to replace the shared_pt with shared_from_this but the results are the same. An other problem that I ignored for the moment is that the used archive should be a kind of memory stream that has no file/disk operations behind. Tia, Andrei _________________________________________________________________ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx

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Re: [Boost-users] [Mutex] behaviour??
by Sakharuk, Vlad (GMI Development) 25 Mar '08

25 Mar '08

I think u are crashing not because of mutex. The problem is here: iter.next (...) != 0 ; should be iter.next != ... end() -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Yasmina Berber Sent: Tuesday, March 11, 2008 8:05 AM To: boost-users(a)lists.boost.org Subject: [Boost-users] [Mutex] behaviour?? Hi, everybody I have a problem to understand mutex behaviour in a server client program . basically there are two threads that execute different code in two different classes but manipulate the same resource: fisrt Class is Subscriber with these members : public: ACE_Unbounded_Set<client_reference> m_set; typedef boost::recursive_mutex Mutex; typedef boost::recursive_mutex::scoped_lock Lock; Mutex mutex_set; and methods: Subscribe (client_reference) : inserts (add) a reference client to the set { ... Lock theScope( mutex_set); m_set.insert (client_reference) ... } Unsubscribe(client_reference) : removes a reference client from the set { ... Lock theScope( mutex_set); m_set.remove (client_reference) } the second class is Manager that has a shared pointer to Subscriber (SubscriberPtr) and does a specific opeartion on each client_reference inside a for loop in the method Manage() { boost::recursive_mutex::scoped_lock scoped_lock(subscriberPtr->mutex_set) for (Subscriber::Set_Iterator iter (subscriberPtr->m_set); iter.next (...) != 0 ; iter.advance ()) { specific opeartion on each client reference } } What happens is that a client can be removed (call to Unsubscribe()) by the first thread during the second one is executing manage() : the set is not well protected and this causes of course seg fault. I probably do something wrong, If you need more details please let me know. Regards. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. --------------------------------------------------------

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Re: [Boost-users] template int argument
by Sakharuk, Vlad (GMI Development) 25 Mar '08

25 Mar '08

Compiler does optimize it away. But it should compile it first to validate correctness of the code. Btw on "g++ (GCC) 3.4.6 20060404 (Red Hat 3.4.6-3)" I do not see those warnings. I also prefer to use: if(n==2) if(n==3)//without else. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Hicham Mouline Sent: Tuesday, March 18, 2008 2:56 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] template int argument That's what I thought... What forbids the compiler from optimizing away the test on n value, during the template instantiation process? Thanks, -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Steven Watanabe Sent: 18 March 2008 18:47 To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] template int argument AMDG Hicham Mouline wrote: > hi, > > I have a template function <typename cT, typename tT, int n> { > .... > double array[n]; > > if (n==2) > binomial code > else if (n==3) > trinomial code (array[0] array[1] array[2]) > else > .... > > > compiler tries to compile the "trinomial code" code even when the > template > is instantiated with n=2, > and that gives warnings because of array[2] > > Is there a way to make the compiler ignore the non-binomial code ? > rds, You'll have to split it out into a separate function and use template specialization/overload resolution. template<int n> void do_n_specific_code(double (&array)[n]); template<typename cT, typename tT, int n> void f() { double array[n]; do_n_specific_code(array); } In Christ, Steven Watanabe _______________________________________________ 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 -------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. --------------------------------------------------------

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Matching wildcards
by Dilts, Daniel D. 25 Mar '08

25 Mar '08

Using Boost.Filesystem, is there a way to get a list of all of the files that match a wildcard pattern, such as image*.* ? This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated.

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