August 2002 - Boost-users - lists.preview.boost.org

boost::shared_ptr and stl algorithms
by Bill Eidson 15 Apr '05

15 Apr '05

std::vector< boost::shared_ptr<T> > TVec; I want to write a function object to run std::for_each. to do somework against members of T and accumulate results in functor. My attempts have failed in VC7 with memory errors in my operator() method. struct fo { bool operator()( boost::shared_ptr<T>& t ) { return true; } }; Thanks in advance bille

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BGL and reversing / moving edges
by joshrose 17 Dec '03

17 Dec '03

G'day, I was hoping someone might be able to tell me if they've run into any situations using BGL where they needed to move (or reverse (i.e. flip the source and target)) an edge within a graph implemented as an adjacency_list. I'm working on an implementation of an algorithm for max. weight bipartite matching ("the assignment problem"), and one of the assumptions in the algorithm is that non-matched edges are directed from one subgraph, A, to the other subgraph, B, and matched edges are directed the other way. Over the course of growing the matching, a simple way to add and remove edges from the candidate set is just to reverse the edge, thus the need for some way to reverse the edge within BGL. I don't think I can just remove and then re-add the edge in the other direction, primarily because doing so will (I believe) invalidate any edge_descriptors referring to that edge. In particular, there are property maps keeping track of the weight of edges, the predecessors of certain nodes, etc. that use edge descriptors as keys. I've spent a fair bit of time reading the documentation and looking through the implementation of adjacency_lists (incl. edge_list_impl), and I'm not really sure of a way to either move an edge directly within a graph, or even to create a new edge from another s.t. they have the same edge_descriptor (in general a bad thing, probably). Anyone have any thoughts on this? Thanks, -Josh

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bug report: boost::tokenizer with VC6
by Navi Singh 09 Feb '03

09 Feb '03

The boost release 1.28.0 of the tokenizer library has the following problem: There are 5 examples, namely, simple_example_1.cpp thru simple_example_5.cpp If I change the main() in each of the 5 to to main1() thru main5() and return 0; the vc60 compiler generates an internal compiler error when parsing the file boost\iterator_adapters.hpp on line 869, where it is parsing the following lines: reference operator*() const { return policies().dereference(*this); }

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Q: Graphs. Sorting edges. Possible? How to?
by stas_fomin 07 Nov '02

07 Nov '02

Hello. I a newbie in BGL and I rewrite my LEDA code now... I have to sort (order) edges according to some functor. For example (simplified): typedef adjacency_list<vecS, vecS, bidirectionalS> MyGraph; typedef graph_traits < MyGraph >::edge_descriptor MyGraphEdge; typedef graph_traits < MyGraph >::edge_iterator MyEdgeIter; class MyCompareEdges{ public: bool operator()(MyGraphEdge e1, MyGraphEdge e2) const { return true; } }; .... { MyGraph Gr(10); MyEdgeIter ei_beg, ei_end; MyCompareEdges comp; tie(ei_beg, ei_end) = edges(Gr); std::sort(ei_beg, ei_end, comp); //Error C2676 } And I have error C2676 (below the message...). Questions: 1. Is it possible to sort edges in the graph? 2. How to... Thanks all in advance... Stas Fomin. P.S. vecS, setS, listS for edge container... - C2676. ------------------------------ d:\projects\lib\cpp_libs\libboost\boost\iterator_adaptors.hpp(264) : error C2676: binary '+=' : 'class std::list<struct boost::list_edge<unsigned int,struct boost::no_property>,class std::allocator<struct boost::list_edge<unsigned int,struct boost:: no_property> > >::iterator' does not define this operator or a conversion to a type acceptable to the predefined operator d:\projects\lib\cpp_libs\libboost\boost\iterator_adaptors.hpp (911) : see reference to function template instantiation 'void __thiscall boost::default_iterator_policies::advance(struct boost::iterator_adaptor<class std::list<struct boost::lis t_edge<unsigned int,struct boost::no_property>,class std::allocator<struct boost::list_edge<unsigned int,struct boost::no_property> > >::iterator,struct boost::detail::undirected_edge_iter_policies,class boost::detail::edge_desc_impl<struct boost::b idirectional_tag,unsigned int>,class boost::detail::edge_desc_impl<struct boost::bidirectional_tag,unsigned int>,class boost::detail::edge_desc_impl<struct boost::bidirectional_tag,unsigned int> *,struct boost::multi_pass_input_iterator_tag,int> &,i nt)' being compiled Error executing cl.exe.

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Possible bug in boost_1_28
by Christopher Henrich 11 Oct '02

11 Oct '02

This bug comes up when I try to include <boost/array.hpp> in certain CodeWarrior projects. (CodeWarrior 8.0, running under Mac OS 10.1.5 on G3 "beige tower") If I initialize the project with stationery "C++ Console Mach-O", and I change HelloWorld.cp to include <boost/array.hpp>, then I get this error message: Error: undefined identifier 'ptrdiff_t' suffix.hpp line 204 included from config.hpp: 57 array.hpp:27 HelloWorld.cp: 10 If I initialize with PowerPlant stationery, I do not have this problem. Chris Henrich

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Problem using 'shared_ptr<T>::operator impl-defined-type()'
by Hickman, Greg 30 Sep '02

30 Sep '02

With Borland 5.5.1, I'm not having any luck using a shared_ptr in a boolean context. The compiler complains that the 'if' condition below contains an "Illegal structure operation". Is this a known deficiency with my compiler? -Greg Hickman #include <boost/shared_ptr.hpp> int main(int argc, char* argv[]) { boost::shared_ptr<int> intp; if (intp) // error here ; return 0; }

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[BGL] How to change the type of vertex_descriptor??
by Erik Arner 14 Sep '02

14 Sep '02

Hi, I have a BGL graph in the following manner: typedef adjacency_list < vecS, vecS, directedS, no_property, property <edge_weight_t, int, property <edge_weight2_t, double> > > Graph; I also have: typedef graph_traits<Graph>::vertex_descriptor Vertex; Now, the default vertex_descriptor seems to be unsigned int. How do I change this to int? Also, where (in which file) is the default set? On another note: the online reference manual is pretty good in my opinion, but it's hard to get a real overview of the contents. It also lacks an index, making it hard to look up questions like the one above. Is the book any better in this respect? Any other references worth looking up - books or webpages? Thanks, Erik

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[BGL] Problem with kevin-bacon sample
by Nicolas Guilhot 14 Sep '02

14 Sep '02

Hi all, I compiled the kevin-bacon sample on a linux box without any problem, but when I try to run the program, I obtain an error output instead of what is expected. Any help would be appreciated. Here is the output off the program : kevin-bacon: /boost_1_27_0/boost/token_iterator.hpp:75: void boost::detail::tokenizer_policy<Type, TokenizerFunc>::increment (Iterator &) [with Iterator = boost::iterator_adaptor<boost::detail::token_iterator_base<const char *>, boost::detail::tokenizer_policy<basic_string<char, string_char_traits<char>, __default_alloc_template<true, 0> >, boost::char_delimiters_separator<char, string_char_traits<char> > >, basic_string<char, string_char_traits<char>, __default_alloc_template<true, 0> >, const basic_string<char, string_char_traits<char>, __default_alloc_template<true, 0> > &, const basic_string<char, string_char_traits<char>, __default_alloc_template<true, 0> > *, forward_iterator_tag, ptrdiff_t>, Type = basic_string<char, string_char_traits<char>, __default_alloc_template<true, 0> >, TokenizerFunc = boost::char_delimiters_separator<char, string_char_traits<char> >]: Assertion `b.base().valid_' failed. Abandon Thanks for any answer. Nicolas

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BGL and Intel v6 compiler?
by Chris Russell 14 Sep '02

14 Sep '02

Lack of partial template specialization and MSVC 6.0 "Internal Compiler Error" has me looking for alternatives. Specifically, I'm considering moving some BGL-dependent code into a library and compiling it with the Intel v6.0 compiler for Windows which can produce object code and libraries that I can link into a MSVC 6.0 project. Can anyone comment on the Intel compiler's support for partial specialization - I'm not finding much except number crunching benchmark comparisons. Thanks - Chris

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n-ary ordered tree template in boost ??
by Marc Cromme 06 Sep '02

06 Sep '02

Dear Boost Members I was wondering if there is an n-ary ordered tree template in boost, something like template <size_t N, class Type, class Alloc = allocator<Type > > class NTree which is a standard container, and a reversible container, ordered by level. That is, first element is root, next series of elements are childs of roots, next series are grandchilds of root , and so on. This way one could parse level by level like a reversible container. There should be the obvious member functions for inserting/deleting child nodes and subtrees. As far as I can see, there is not such a template in boost, but the question is then: 1) can it be emulated using the grah library ?? or 2) is there already an proposal/prototype for such a thing ?? or 3) would it be interesting to include such a thing in boost ?? your's sincierely, Marc Cromme

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RE: [Boost-Users] tuple and enums
by Tom Matelich 03 Sep '02

03 Sep '02

Hello Jaakko, Thanks for replying. It works if the constructor is written cons() {} Is there any purpose to putting those default calls there? Tom > From: Jaakko Jarvi [mailto:jajarvi@cs.indiana.edu] > Sent: Thursday, August 29, 2002 8:16 AM > > Hi Tom, > > Your code compiles fine with gcc 3.x and icc 6 (linux), so it may just > be gcc 2.96 problem. > > Cheers, Jaakko > > On Wed, 28 Aug 2002, Tom Matelich wrote: > > > It appears that an enum cannot be default constructed in > the way that > > tuple > > does, > > cons() : head(), tail() {} > > > > Any idea on how to get around this (besides using an int in > the tuple)? > > > > Thanks, > > Tom > > > > > > <sample_code> > > > > #include <boost/tuple/tuple.hpp> > > #include <string> > > > > enum Foo { Willis, Arnold }; > > > > void test() > > { > > boost::tuple<Foo, std::string> a; > > } > > > > </sample_code> > > > > </error compiler="gcc version 2.96 20000731 (Mandrake Linux 8.2)"> > > > > > /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp: In > > method > > `boost::tuples::cons<HT, > > TT>::cons () [with HT = Foo, TT = boost::tuples::cons<string, > > boost::tuples::null_type>]': > > > /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp:454: > > instantiated from `boost::tuples::tuple<T0, T1, T2, T3, T4, > T5, T6, T7, > > T8, > > T9>::tuple () [with T0 = Foo, T1 = string, T2 = > > boost::tuples::null_type, T3 > > = boost::tuples::null_type, T4 = boost::tuples::null_type, T5 = > > boost::tuples::null_type, T6 = boost::tuples::null_type, T7 = > > boost::tuples::null_type, T8 = boost::tuples::null_type, T9 = > > boost::tuples::null_type]' > > tuple_enum_test.cpp:8: instantiated from here > > > /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp:263: > > cannot convert `int' to `Foo' in > > assignment > > > > </error> > > > > > > > -------------------------------------------------------------- > --------- > > DISCLAIMER: Information contained in this message and/or > > attachment(s) may contain confidential information of Zetec, Inc. > > If you have received this transmission in error, please notify > > the sender by return email. > > > -------------------------------------------------------------- > --------- > > > > Yahoo! Groups Sponsor > > ADVERTISEMENT > > > > Info: <http://www.boost.org> > > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > -- -- -- Jaakko Järvi email: jajarvi(a)cs.indiana.edu -- Post Doctoral Fellow phone: +1 (812) 855-3608 -- Pervasive Technology Labs fax: +1 (812) 855-4829 -- Indiana University, Bloomington Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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Question about scoped_ptr.hpp and config.hpp
by eldritchshadows 31 Aug '02

31 Aug '02

Is there a reason that scoped_ptr.hpp doesn't have config.hpp up at the top like shared_ptr.hpp? When I included it, it got rid of a lot of MSVC++ warnings. Nathan

2 1

shared_ptr and make_indirect_iterator
by Richard Wolf 31 Aug '02

31 Aug '02

Hi I'm trying to use make_indirect_iterator on a container of shared_ptrs as follows: #include <boost/iterator_adaptors.hpp> #include <boost/shared_ptr.hpp> #include <list> #include <algorithm> #include <functional> using std::mem_fun_ref; using std::mem_fun; using std::list; using boost::shared_ptr; using std::for_each; using boost::make_indirect_iterator; class A { public: void f(){} }; int main() { list<A *> List1; list<shared_ptr<A> > List2; // This works for_each(make_indirect_iterator(List1.begin()), make_indirect_iterator(List1.end()), mem_fun_ref(&A::f)); // This doesn't work for_each(make_indirect_iterator(List2.begin()), make_indirect_iterator(List2.end()), mem_fun_ref(&A::f)); } The second use of for each fails to compile (error messages at the end of the message). Is it possible to do this? Am I doing something wrong? I'm using gcc v 2.95.2. and the QNX OS. Thanks Richard QCC -I/home/rwolf/boat/src/includes -I/home/rwolf/boat/src/boost_1_27_0 -Wal l -L/home/rwolf/boat/src/lib -L. -O -g -I/home/rwolf/boat/src/includes -I/h ome/rwolf/boat/src/boost_1_27_0 -Wall test.cpp -o test /usr/include/xutility: In instantiation of `std::iterator_traits<boost::shared_ptr<A> >': /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1104: instantiated from `boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::all ocator<boost::shared_ptr<A> > >::iterator>' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: instantiated from here /usr/include/xutility:81: no type named `iterator_category' in `class boost::shared_ptr<A>' /usr/include/xutility:82: no type named `value_type' in `class boost::shared_ptr<A>' /usr/include/xutility:83: no type named `difference_type' in `class boost::shared_ptr<A>' /usr/include/xutility:84: no type named `difference_type' in `class boost::shared_ptr<A>' /usr/include/xutility:85: no type named `pointer' in `class boost::shared_ptr<A>' /usr/include/xutility:86: no type named `reference' in `class boost::shared_ptr<A>' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: In instantiation of `boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::all ocator<boost::shared_ptr<A> > >::iterator>': /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: instantiated from here /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1104: no type named `value_type' in `struct std::iterator_traits<boost::shared_ptr<A> >' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1105: no type named `reference' in `struct std::iterator_traits<boost::shared_ptr<A> >' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1106: no type named `pointer' in `struct std::iterator_traits<boost::shared_ptr<A> >' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: In function `int main()': /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type named `value_type' in `struct boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo cator<boost::shared_ptr<A> > >::iterator>' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type named `reference' in `struct boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo cator<boost::shared_ptr<A> > >::iterator>' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type named `pointer' in `struct boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo cator<boost::shared_ptr<A> > >::iterator>' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template argument 2 is invalid /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template argument 3 is invalid /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template argument 5 is invalid /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: At top level: /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: In instantiation of `boost::make_indirect_iterator<std::list<boost::shared_ptr<A>,std::allocator <boost::shared_ptr<A> > >::iterator>(...)': test.cpp:26: instantiated from here /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type named `value_type' in `struct boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo cator<boost::shared_ptr<A> > >::iterator>' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type named `reference' in `struct boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo cator<boost::shared_ptr<A> > >::iterator>' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type named `pointer' in `struct boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo cator<boost::shared_ptr<A> > >::iterator>' /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template argument 2 is invalid /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template argument 3 is invalid /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template argument 5 is invalid /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: In function `{error} boost::make_indirect_iterator<std::list<boost::shared_ptr<A>,std::allocator< boost::shared_ptr<A> > >::iterator>(...)': /home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: confused by earlier errors, bailing out cc: /usr/lib/gcc-lib/ntox86/2.95.2/cc1plus error 34 make: *** [test] Error 1

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tokenizer
by Vijay 30 Aug '02

30 Aug '02

Hello, Is there anyway I can combine two tokens and check it as single one? I want to divide my string when both "-" and ">" occur together: Cell 12-1 -> xyz... I want to get the first token as Cell 12-1, how can I achive this via tokenizer? Thank you, Vijay

1 0

msvc-stlport build problems
by David Resnick 30 Aug '02

30 Aug '02

Hi, I'm trying to build boost version 1.28.0, msvc-stlport build, using the following line: bjam -sTOOLS=msvc-stlport -sstlport-iostream=on -sSTLPORT_PATH=c:\etc I have no problems building the msvc build. It seems to me that the problem has to do with the MS Platform SDK that I have installed. When compiling STLPort (version 4.5.3) I had similar warnings. 2 work arounds that I found there were either to remove the platform SDK from the include enviroment variable, or (when I found it) to define _STLP_NEW_PLATFORM_SDK in stl_user_config.h. I've tried variations of that with compiling Boost, but nothing makes a difference. I've included the error messages that I get for most files. ---------------------------- CUT HERE ---------------------------- vc-C++ libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link- dynamic\stlport-cstd-namespace-std\stlport-ios tream-off\stlport-version-4.5.3\c_regex_traits.obj c_regex_traits.cpp C:\PROGRA~1\MICROS~3\VC98\include\winbase.h(1011) : error C2733: second C linkage of overloaded function 'InterlockedIncremen t' not allowed C:\PROGRA~1\MICROS~3\VC98\include\winbase.h(1009) : see declaration of 'InterlockedIncrement' C:\PROGRA~1\MICROS~3\VC98\include\winbase.h(1018) : error C2733: second C linkage of overloaded function 'InterlockedDecremen t' not allowed C:\PROGRA~1\MICROS~3\VC98\include\winbase.h(1016) : see declaration of 'InterlockedDecrement' C:\PROGRA~1\MICROS~3\VC98\include\winbase.h(1026) : error C2733: second C linkage of overloaded function 'InterlockedExchange ' not allowed C:\PROGRA~1\MICROS~3\VC98\include\winbase.h(1023) : see declaration of 'InterlockedExchange' "cl" /Zm400 -nologo -GX -c -DBOOST_REGEX_NO_LIB=1 -DBOOST_REGEX_STATIC_LINK=1 -D_STLP_NO_SGI_IOSTREAMS=1 -D_STLP_DO_IMP ORT_CSTD_FUNCTIONS=1 -D_STLP_DEBUG=1 -D_STLP_DEBUG_UNINITIALIZED=1 -D_STLP_NEW_PLATFORM_SDK=1 /Z7 /Od /Ob0 /GX /GR /MDd -I "libs\regex\build" -I"C:\etc\boost_1_28_0" -I"c:\etc\STLport-4.5.3\stlport" -I"C:\PROGRA~1\MICROS~3\VC98\include" -Fo"libs \regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link-dyna mic\stlport-cstd-namespace-std\stlport-iostream-off\s tlport-version-4.5.3\c_regex_traits.obj" -Tp"libs\regex\build\../src\c_regex_traits.cpp" ...failed vc-C++ libs\regex\build\bin\libboost_regex.lib\msvc-stlport\debug\runtime-link- dynamic\stlport-cstd-namespace-std\s tlport-iostream-off\stlport-version-4.5.3\c_regex_traits.obj... ---------------------------- CUT HERE ---------------------------- Thanks in advance, David Resnick MobileSpear Inc.

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BJam and XEmacs on WinXP
by Dan Muller 30 Aug '02

30 Aug '02

This may be a tad off-topic, but I couldn't find any reference to this relative to XEmacs, and the problem seems to be peculiar to bjam. If I try to run bjam under XEmacs, e.g. via M-x compile, M-x shell-command, or even from inside an XEmacs shell buffer (running CMD), I get the error "spawn: Invalid argument". More specifically, if I run it via shell-command, I get this: ===================== ...found 331 targets... ...updating 1 target... gcc-Archive-action ..\phys_sim\bin\libphys_sim.lib\gcc-nocygwin\debug\architecture-native\debug-symbols-on\inlining-off\optimization-off\profiling-off\rtti-on\runtime-build-debug\runtime-link-dynamic\threading-single\vtable-thunks-default\libphys_sim.lib spawn: Invalid argument ====================== ... which indicates that bjam is in fact starting, but has some problem. Or maybe the tools do. If I run it in the same directory from a regular command window, it works fine. I'm running XEmacs 21.4, with recently updated packages. The bjam executable was downloaded yesterday. (I'm trying to use it for something other than Boost, BTW.) The toolset I'm using is MinGW, the latest stable full-package release, with no package updates. Anyone have an idea what might be wrong? I'm getting tired of looking at my build output in a command window and then hunting for line numbers in my source code. :-)

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problem with preprocessing library
by Ellis Cohen 30 Aug '02

30 Aug '02

Using the Boost preprocessor library, I'm getting an unexpected diagnostic from the HP-UX C++ compiler (aCC, version "HP ANSI C++ B3910B A.03.34"). The generated output -- see the last line of "Compiler output", below -- *is* correct. I'm using Boost_1_28_0. Is my use of the preprocessor library incorrect? Ellis Cohen ======================================================================== Code fragment triggering the diagnostic: #include <boost/preprocessor/cat.hpp> #include <boost/preprocessor/comma_if.hpp> #include <boost/preprocessor/repeat.hpp> #include <boost/preprocessor/tuple/elem.hpp> #define FOO0 (0, double, some_value) #define FOO1 (0, double, some_other_value) #define FOO2 (0, double, some_other_other_value) #define FOO_CNT 3 #define PPV(I) FOO##I #define PPV_FLAG(I) BOOST_PP_TUPLE_ELEM(3,0,PPV(I)) #define PPV_TYPE(I) BOOST_PP_TUPLE_ELEM(3,1,PPV(I)) #define PPV_NAME(I) BOOST_PP_TUPLE_ELEM(3,2,PPV(I)) #define BOOST_PP_DEF(I,_) BOOST_PP_COMMA_IF(I) BOOST_PP_CAT(d_,PPV_NAME(I))(BOOST_PP_CAT(other.d_,PPV_NAME(I))) BOOST_PP_REPEAT(FOO_CNT, BOOST_PP_DEF, _) #undef BOOST_PP_DEF ======================================================================== Compiler command: /opt/aCC/bin/aCC \ -Iboost_includes \ -Wc,-ansi_for_scope,on \ -Aa \ +inst_compiletime +inst_v \ -E -c Isrc/boost_bug.C -o boost_bug.o ======================================================================== Compiler output: Warning (anachronism) 823: "Isrc/boost_bug.C", line 18 # Redundant preprocessing concatenation operation results in two valid preprocessing tokens. Depending on this implementation defined behavior will result in non-portable code. BOOST_PP_REPEAT(FOO_CNT, BOOST_PP_DEF, _) ^^^^^^^^^^^^^^^ Warning (anachronism) 823: "Isrc/boost_bug.C", line 18 # Redundant preprocessing concatenation operation results in two valid preprocessing tokens. Depending on this implementation defined behavior will result in non-portable code. BOOST_PP_REPEAT(FOO_CNT, BOOST_PP_DEF, _) ^^^^^^^^^^^^^^^ Warning (anachronism) 823: "Isrc/boost_bug.C", line 18 # Redundant preprocessing concatenation operation results in two valid preprocessing tokens. Depending on this implementation defined behavior will result in non-portable code. BOOST_PP_REPEAT(FOO_CNT, BOOST_PP_DEF, _) ^^^^^^^^^^^^^^^ #line 1 "Isrc/boost_bug.C" #line 1 "boost_includes/boost/preprocessor/cat.hpp" #line 2 "Isrc/boost_bug.C" #line 1 "boost_includes/boost/preprocessor/comma_if.hpp" #line 1 "boost_includes/boost/preprocessor/comma.hpp" #line 17 "boost_includes/boost/preprocessor/comma_if.hpp" #line 1 "boost_includes/boost/preprocessor/empty.hpp" #line 18 "boost_includes/boost/preprocessor/comma_if.hpp" #line 1 "boost_includes/boost/preprocessor/if.hpp" #line 1 "boost_includes/boost/preprocessor/logical/bool.hpp" #line 17 "boost_includes/boost/preprocessor/if.hpp" #line 1 "boost_includes/boost/preprocessor/tuple/elem.hpp" #line 18 "boost_includes/boost/preprocessor/if.hpp" #line 19 "boost_includes/boost/preprocessor/comma_if.hpp" #line 3 "Isrc/boost_bug.C" #line 1 "boost_includes/boost/preprocessor/repeat.hpp" #line 4 "Isrc/boost_bug.C" #line 18 d_some_value( other.d_some_value) , d_some_other_value( other.d_some_other_value) , d_some_other_other_value( other.d_some_other_other_value)

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RE: [Boost-Users] boost::any and operator ==
by Jim.Hyslop 29 Aug '02

29 Aug '02

> How do I compare two boost::any values for equality? How to I compare > two containers of boost::any's for equality? > > Why doesn't boost::any define this operator? There has to be > a reason. There is. boost::any can, quite literally, hold *anything*. In order to compare the objects being held, you must first know if they _can_ be compared. Consider: const char * initialMessage = "Snowflakes keep falling on my head"; void f() { boost::any multiA(42L); boost::any multiB(initialMessage); //... It doesn't make sense to compare the two 'any' objects. I suppose boost::any could coerce the pointer into a long, and then apply a comparison operator, but the results of that comparison would be meaningless. In order to compare the objects, you'll have to extract them from the any container using an any_cast. Which, of course, means you'll have to know the exact type of the object being held (or which type of a known set of types). -- Jim

2 1

Sorting a container of shared_ptr<T>
by alejandro_escalante_medina 29 Aug '02

29 Aug '02

Hello to everyone. I'm starting to take a look on Boost and was happy to find things like better smart pointers. Though, in my tests, I haven't been able to sort, say, a vector of shared_ptr without defining special comparators. I thought that the overload for the < operator would help me for that, but that operator compares pointers, not objects, so it doesn't do the work that I expected. I guess I'm not understanding this well. Could someone explain this to me? Saludos, Alex

2 1

threads and signals question
by lparrab 29 Aug '02

29 Aug '02

Hi all, I guess my question is not specific to Boost.Thread, but to threading in general (I'm new at it)... still hope you can help me out, either directly or by redirecting me to the right place (links are very much appreciated) I'm starting a multi-threaded program using Boost.Thread library: it is a "server", in which a thread loops around a "select" to accept new connections and see when a socket has data to be read, in which case puts the fds in queue from which other threads are taking them out to read the data. The problem I have, is that when a "ReceiverThread" finishes reading the data from the socket, it puts the fd back in the "all connections list", but by this time the other ("main")thread already copied the fds from the list and got into the next "select" loop, which means the socket from which the "receiver" just finished reading, will not be "selected" (monitored) untill the next select loop, which will not be untill a) a new connection comes or b)one of the other connected sockets gets some data that takes makes the main thread return from select. reading the select man, I thought I could just use a signal to force select to return when the "receiver" has put the fd back in the "all connection list": the threads are now executing something like: main_thread { *put all fds from "all sockets" list into a fdset *make a select on the fdset (block till something interesting happens) *take the fds with data out of "all sockets" and put them into "sockets with data" *loop } receiver{ *get a fd from "sockets with data" (if nothing there blocks till the main_thread sends us a fd through the queue) *read from fd *put fd back into "all sockets" (problem: main_thread may be (is!) already into the select) *raise(SIGUSR1) (to force select to return and enter the loop again, but this time with our fd) } the signal handler for SIGUSR1 does nothing, it just serves to force select to return, but the code is not really working as I expected, and I realized that the problem is that each thread has its own pid, so it seems raise is actually sending a signal to the wrong thread.... as I said, I am new to mulithreading, but I thought all threads run in a process, which means, they all have the same pid. ->if I first find out the "pid" of the main_thread and change raise(SIGUSR1) to kill(pid,SIGUSR1) it works ok. so my question: why does each thread have a own pid?? how can then I send signals from one thread to another?? I discovered there is a "pthread_kill" function to send signals to specific threads, the problem is I only have boost::thread objects, no pthread_t structures. or am I talking nonsense and shouldnt be using signals with Boost.Thread? if so, how do I solve the select problem?? thanx! luis

5 5

BGL: adjacency_list: remove_edge problems
by Matthias Kronenberger 29 Aug '02

29 Aug '02

I'm using a undirected grap with hash_setS as the Edge List container and vecS as the Vertex List Container I'm using MSVC60 with SP5 as soon as i'm trying to use remove_edge(vertex1,vertex2,graph) i get the following error message. I dont understand the error message. It means, that my edgelist is a std::vector allthough i compile with boost::hash_setS. Could it be, that some BGL config file detects MSVC and concludes, that hash sets are not available in the MSVC stl?? d:\matthias\programmieren\boost\boost\graph\detail\adjacency_list.hpp(665): error C2039: 'find': Ist kein Element von 'vector<boost::detail::sei_<unsigned int,list<boost::list_edge<unsigned int,boost::property<enum boost::edge_weight_t,float,boost:: no_property>>>::iter,boost::property<enum boost::edge_weight_t,float,boost::no_property>>,allocator<boost::detail::sei _<unsigned int,list<boost::list_edge<unsigned int,boost::property<enum boost::edge_weight_t,float,boost::no_property>>>::iter,boost ::property<enum boost::edge_weight_t,float,boost::no_property>>>>' find is not an element of vector the corresponding code fragment is. template <class Graph, class EdgeList, class Vertex> inline void remove_edge_and_property(Graph& g, EdgeList& el, Vertex v, boost::disallow_parallel_edge_tag) { typedef typename EdgeList::value_type StoredEdge; typename EdgeList::iterator i = el.find(StoredEdge(v)), end = el.end(); if (i != end) { g.m_edges.erase((*i).get_iter()); el.erase(i); } }

3 6

Re: [Boost-Users] threads and signals question
by dick.bridges＠tais.com 29 Aug '02

29 Aug '02

My $.02. Check out the description of the Leader-Follower thread pattern described in Schmidt, et al, Pattern-Oriented Software Architecture, Volume 2, Patterns for Concurrent and Networked Objects. Sure is easy to implement with Boost libraries. Thank you everyone! Luis De la Parra <lparrab(a)gmx.net To: tomhoward(a)users.sourceforge.net, Boost-Users(a)yahoogroups.com > cc: Subject: Re: [Boost-Users] threads and signals question 08/29/2002 09:37 AM Please respond to Boost-Users > IMHO I wouldn't use select. Each time a new connections is initiated, you > can simply start a new thread to receive data from that socket. I don't > know what performance impact this would have, but the code will certainly > be simpler and easier to maintain. as I said, I'm new to threads.. and I know they are much more "leightweighted" than a normal process, but imagine a server, like an application server, which can have *a lot* of clients connected at the same time, but in which the clients are not really all requesting thigs all the time, they are "just connected" I think having a thread waiting on each open connection is not the right approach here, so I thought of going a kind of "production line" approach in which a few threads (5-10) are reading the data from a bunch of open connections (50-100), the only thing they do is read the data, parse it and form a "Request" which they put in a queue for further processing and then go on to service the other connections. Then another group of threads is taking this requests and doing something, and putting Response objects in yet another queue, which another group of threads "Sender" is taking and sending thorugh the socket. I think you get the idea: a frew threads just doing one thing and then passing the processing to another gorup of threads. I know having a thread dedicated to each connection would be much easier, but since this project is mostly for fun (and to learn!) I'd like to take a "better" approach (note that I am not saying the approach I just described is the best one, but right now it sounds more efficient and scalable to me than the one-trhead-per-connection approach) regards, luis.l Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

1 0

tuple and enums
by Tom Matelich 29 Aug '02

29 Aug '02

It appears that an enum cannot be default constructed in the way that tuple does, cons() : head(), tail() {} Any idea on how to get around this (besides using an int in the tuple)? Thanks, Tom <sample_code> #include <boost/tuple/tuple.hpp> #include <string> enum Foo { Willis, Arnold }; void test() { boost::tuple<Foo, std::string> a; } </sample_code> </error compiler="gcc version 2.96 20000731 (Mandrake Linux 8.2)"> /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp: In method `boost::tuples::cons<HT, TT>::cons () [with HT = Foo, TT = boost::tuples::cons<string, boost::tuples::null_type>]': /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp:454: instantiated from `boost::tuples::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>::tuple () [with T0 = Foo, T1 = string, T2 = boost::tuples::null_type, T3 = boost::tuples::null_type, T4 = boost::tuples::null_type, T5 = boost::tuples::null_type, T6 = boost::tuples::null_type, T7 = boost::tuples::null_type, T8 = boost::tuples::null_type, T9 = boost::tuples::null_type]' tuple_enum_test.cpp:8: instantiated from here /usr/local/eddynet/opt/include/boost/tuple/detail/tuple_basic.hpp:263: cannot convert `int' to `Foo' in assignment </error> ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

2 1

shared_ptr const problem
by Olaf Petzold 28 Aug '02

28 Aug '02

Hi, now I have a new problem - const correctness. ---8<--- #include <iostream> #include <algorithm> #include <iterator> #include <vector> #include <boost/shared_ptr.hpp> class Doc { public: virtual ~Doc() { } public: const std::vector<double>& foo() const { return m_foo; } protected: std::vector<double>& foo() { return m_foo; } private: std::vector<double> m_foo; }; using namespace std; int main() { boost::shared_ptr<Doc> lp_doc( new Doc ); std::copy(lp_doc->foo().begin(), lp_doc->foo().end(), std::ostream_iterator<double>(cout, " ") ); cout << endl; } --->8--- `std::vector<double, std::allocator<double> >& Doc::foo()' is protected I hoped std::copy takes the const foo() member function. Thanks olaf

2 2

iterator_adaptors on mipspro 7.3.1.3m
by marcinzalewski 28 Aug '02

28 Aug '02

Hi, I am trying to use iterator adaptors on mipspro and am unsuccessfull as for now. I was wandering if any of you has experience with boost and mipspro. Here are some examples of errors I am getting: ----------- cc-1132 CC: ERROR File = ../../boost_1_28_0/boost/iterator.hpp, Line = 54 The namespace "std" has no member "ptrdiff_t". template <class Category, class T, class Distance = std::ptrdiff_t, ^ or cc-3307 CC: ERROR File = ../../boost_1_28_0/boost/type_traits/array_traits.hpp, Line = 24 Invalid partial specialization--class "boost::is_array<<error-type>>" is already fully specialized. template <typename T, std::size_t N> struct is_array<T[N]> ----------- Please, let me know if you did this before. :) -m ^

2 2

[BGL] undirectedS self-loop add_edge assertion
by Chris Russell 27 Aug '02

27 Aug '02

Just a quick mention: A call to add_edge with u == v causes an assertion if Directed == undirectedS. adjacency_list.hpp line 843: assert( u != v ); // don't allow self-loops ^- boost_1_28_0 Avoiding the assertion is easy enough but this is inconsistent w/section 14.1.1 p.220 of the BGL book: "... Also if u and v are descriptors for the same vertex (creating self loop) and the graph is undirected, then the edge will not be created and the flag will be false." Am having tons of fun - the BGL and the book are super. Thanks! - Chris

2 1

lambda library usage
by khuroth 27 Aug '02

27 Aug '02

I have a View class that has some widgets, and a Controller class that controls the view, so the View class has a GetController() member function that returns a reference to its controller. When the View's constructor is called, GetController() would return a bad ref, but it would return a valid reference by the time a button is clicked... so what I'm trying to do is, inside the View constructor: my_button.on_click = bind( (_1 ->* &A::GetController).DoSomething(), this ); but that obviously doesn't work... I'm even having trouble just saving the first part: my_button.on_click = bind<Controller&>(_1 ->* &A::GetController, this); also doesn't work... I tried defining the on_click member of the button as a boost::function<void> or a boost::function0<void> in the first example, and a boost::function<Controller&> or boost::function0<Controller&> in the second snip... I get immense compiler errors, so I'm not sure where I messed up. What am I doing wrong?

3 8

shared_ptr swap problems
by Olaf Petzold 27 Aug '02

27 Aug '02

Hello, I've trouble with the follwong snippet: #include <iostream> #include <boost/shared_ptr.hpp> struct A { A(const char* n) : name(n) { } const char* name; }; struct B : public A { B(const char* n) : A(n) { std::cout << "construct " << name << std::endl; } ~B() { std::cout << "destruct " << name << std::endl; } }; struct BaseC { virtual void set(const boost::shared_ptr<A>& ptr) = 0; }; struct C : public BaseC { C() : b( new B("C::b") ) { } void set(const boost::shared_ptr<A>& ptr) { b.swap( boost::shared_static_cast( ptr ) ); // L21 } void print() { std::cout << b->name << std::endl; } boost::shared_ptr b; }; using namespace std; int main() { boost::shared_ptr<A> b( new B("b") ); C c; c.print(); c.set( b ); c.print(); } t.cc: In member function `virtual void C::set(const boost::shared_ptr<A>&)': t.cc:21: no matching function for call to `boost::shared_ptr::swap(boost::shared_ptr)' /usr/include/boost/shared_ptr.hpp:234: candidates are: void boost::shared_ptr<T>::swap(boost::shared_ptr<T>&) [with T = B] I did try boost::shared_polymorphic_cast to get a std::bad_cast exception - but it doesn't compile too. How can get it working? Thanks Olaf

3 7

RE: [Boost-Users] How can checkout the files in Attic (hidden) fr om the cvs server?
by Jim.Hyslop 27 Aug '02

27 Aug '02

> I'm using WinCvs to checkout the current version of boost from the > cvs server. However, I found that I can not checkout some of the > libs which are put in the Attic, though I can browse them through my > internet browser. Anyone knows how to check these files out? (for > example, the mpl lib) Any files in the Attic are either obsolete, or have been added only on a branch and have not been merged to the trunk yet. Unless you are having a specific problem that requires a file from the Attic, then don't worry about what's up there (I suspect that's probably why it's called the "Attic" - out of sight, out of mind ;-) -- Jim

1 0

How can checkout the files in Attic (hidden) from the cvs server?
by li_lirong 27 Aug '02

27 Aug '02

I'm using WinCvs to checkout the current version of boost from the cvs server. However, I found that I can not checkout some of the libs which are put in the Attic, though I can browse them through my internet browser. Anyone knows how to check these files out? (for example, the mpl lib) Thanks in advance, Lirong

1 0

boost::any and operator ==
by billrobertson42 27 Aug '02

27 Aug '02

How do I compare two boost::any values for equality? How to I compare two containers of boost::any's for equality? Why doesn't boost::any define this operator? There has to be a reason. Thanks!

1 0

What's your wish list?
by Kevin S. Van Horn 26 Aug '02

26 Aug '02

I'm teaching a graduate class on generic programming this semester, and I'm looking for some solid, meaningful projects for my students. If there are extensions to existing Boost libraries that you would like, or some new C++ library that you would like written, please contact me. -- Kevin S. Van Horn kevin.vanhorn(a)ndsu.nodak.edu

1 0

Using Hash with Graph
by Sandeep Bhutani 26 Aug '02

26 Aug '02

Hi, I am trying to use hash feature with the graph library. Here are the various details: Solaris: SunOS 5.7 Compiler: KAI 4.0 STL: Native Sun Hash: A hacked up version of SGI/STLPort I can get graph to work with vectors/lists. I can't get it to work with the hash_set or hash_map. I get a message from the "concept_checks.h" file in my hash which essentially tells me that the hash function is not defined. I am reproducing the message from the compiler at the bottom. I am trying to make all this work by using the adjacency_list.cpp file in the examples directory. Here is the change I have made to that file: typedef adjacency_list<hash_setS, listS, undirectedS, VertexProperty, EdgeProperty> Graph; // New typedef adjacency_list<vecS, listS, undirectedS, VertexProperty, EdgeProperty> Graph; // Old Can you please help? Has anyone used the has feature in the graph library. I had to edit the line number 166 in adjacency_list.hpp to replace hash_set with hash_map. Thanks -Sandeep The message: "/lsi/home/bhutani/hash/include/concept_checks.h", line 289: error: call of an object of a class type without appropriate operator() or conversion functions to pointer-to-function type return __f(__arg); ^ detected during instantiation of "_Ret _STL_UNARY_FUNCTION_ERROR<_Func, _Ret, _Arg>::__unary_function_requirement_violation(_Func &, const _Arg &) [with _Func=std::hash<boost::detail::adj_list_gen<boost::adjacenc y_list<boost::hash_setS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, size_t, boost::property<boost::vertex_color_t, boost::default_color_type, boost::no_property>>, boost::property<boost::edge_name_t, std::string, boost::no_property>, boost::no_property, boost::listS>, boost::listS, boost::hash_setS, boost::undirectedS, boost::property<boost::vertex_index_t, size_t, boost::property<boost::vertex_color_t, boost::default_color_type, boost::no_property>>, boost::property<boost::edge_name_t, std::string, boost::no_property>, boost::no_property, boost::listS>::config::StoredEdge>, _Ret=size_t, _Arg=boost::detail::adj_list_gen<boost::adjacency_list<boos t::hash_setS, boost::listS, boost::undirectedS, boost::property<boost::vertex_index_t, size_t, boost::property<boost::vertex_color_t, boost::default_color_type, boost::no_property>>, boost::property<boost::edge_name_t, std::string, boost::no_property>, boost::no_property, boost::listS>, boost::listS, boost::hash_setS, boost::undirectedS, boost::property<boost::vertex_index_t, size_t, boost::property<boost::vertex_color_t, boost::default_color_type, boost::no_property>>, boost::property<boost::edge_name_t, std::string, boost::no_property>, boost::no_property, boost::listS>::config::StoredEdge]" at line 95 of "adjacency_list.cpp" 1 error detected in the compilation of "adjacency_list.cpp". KCC: Compilation failed. boost::property<boost::vertex_color_t, boost::default_color_type, boost::no_property>>, boost::property<boost::edge_name_t, std::string, boost::no_property>, boost::no_property, boost::listS>, boost::listS, boost::hash_setS, boost::undirectedS, boost::property<boost::vertex_index_t, size_t, boost::property<boost::vertex_color_t, boost::default_color_type, boost::no_property>>, boost::property<boost::edge_name_t, std::string, boost::no_property>, boost::no_property, boost::listS>::config::StoredEdge]" at line 95 of "adjacency_list.cpp" 1 error detected in the compilation of "adjacency_list.cpp". KCC: Compilation failed.

3 3

Had to change typename to class in template declaration of ref.hpp
by Matthias Kronenberger 26 Aug '02

26 Aug '02

Is that a known bug of MSVC? changing all the typename to class removed the error messages.

1 0

Trouble with boost::bind
by stupid_newcomer 26 Aug '02

26 Aug '02

I'm trying to play with boost::bind and boost::mem_fn, however, i have some difficulties with the member function with more than 2 arguments. I have tried a number of time and gone through the documentation , but still can't found an answer. Example: #include <boost/shared_ptr.hpp> #include <boost/mem_fn.hpp> #include <boost/bind.hpp> #include <iostream> #include <vector> #include <algorithm> using namespace std; class B { public: void print0() const { cout << "B::print0 " << endl; } void print1(int i) const { cout << "B::print1 " < Ptr; vector<Ptr> v; for (int i = 0; i < 3; ++i) { v.push_back(boost::shared_ptr(new B())); } // zero argument, OK for_each(v.begin(), v.end(), boost::mem_fn(&B::print0)); // one argument, OK for_each(v.begin(), v.end(), boost::bind(&B::print1, _1, 5)); // two argument, how to call B::print2 ? // for_each(v.begin(), v.end(), /* B::print2 */); return 0; } Thanks for your help!

2 1

regex_match question
by yg-boost-users＠m.gmane.org 25 Aug '02

25 Aug '02

hello everybody i have a trouble with regex_match function. when i try to match a string with a pattern like "(abc)*", and if the string beeng matched contains several subexpressions 'abc', regex_match returns only one match so that i can't iterate through all of them. so, it counts subexp's in the pattern, not in the string. why it happens (i use default flags for regex_match, which must perform what i expect)? and what is the solution to the problem (the one i found so far is to parse in 2 phases - once with regex_match to be sure that the whole string matched, and then to use regex_split. but i'd like to parse the string only once and obtain all the subexp's)? thanks in advance aram

3 4

JAM and boost.pythyon
by sashan 24 Aug '02

24 Aug '02

Hi I've built the Python library and a few of my own test projects. I have problems when trying to link with an external library. Basically I get the 'unresolved external' link error. So I look at the jamfile I'm using and in the dependencies section add the following <dll>E:/code/Library/MyLib Then I run bjam again and the first error I get is E:/Code/Library/Jamfile: No such file or directory So I guess its looking for a Jamfile in that directory. Problem is I don't know what to put inside the Jamfile. Can someone please help? Thank you Sashan

2 1

REGEX - expression doesn't match
by Fr�d�ric Mayot 24 Aug '02

24 Aug '02

Hi, My problem is really simple : I have several regular expressions (like (19[4-9]\d)|(200\d)|( [09]\d ) ) which work when they correspond to the entire string, e.g. : "2002" OK; "something 2002 something" NOT OK. Everythings worked fine with the GRETA library, and now, it doesn't. Does anyone have an idea ? Thanks. Fred

3 5

Re: [Boost-Users] Re: REGEX - expression doesn't match
by dan.ellis＠sophos.com 23 Aug '02

23 Aug '02

> It's simple : I have a string and a regular expression. I only want to > find the FIRST sub-string which matches my regular expression (S), then > to extract the sub-string before S and the sub-string after S. Off the top of my head, it sounds like you want: (.+)(200\d)(.*) -- Dan Ellis, Software Engineer, Sophos Anti-Virus Email: dan.ellis(a)sophos.com, DDI: 01235 540204 Real Business/CBI Growing Business Awards: Company of the Year Tel: 01235 559933, Web: http://www.sophos.com/

1 0

Graph - return edge_descriptor
by Shaw, Richard A 23 Aug '02

23 Aug '02

Can anybody tell my why the find_edge function in the code below fails to get a property if I return the first edge in the list. This is what happens - Find_edge looks for edge A - B It winds it and prints out the edge descriptor, and the weight of the edge It the returns the edge The main code prints out the edge descriptor and the fails when trying to print the weight. BTW - Is there a ready made function to find an edge based on the vertices ? #include <boost/config.hpp> #include <iostream> #include <fstream> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/dijkstra_shortest_paths.hpp> using namespace boost; // Find edge template <class Graph> std::pair<bool, graph_traits<Graph>::edge_descriptor> find_edge(graph_traits<Graph>::vertex_descriptor u, graph_traits<Graph>::vertex_descriptor v, Graph g) { graph_traits<Graph>::out_edge_iterator ei, edge_end; for (boost::tie(ei,edge_end) = out_edges(u, g); ei != edge_end; ++ei) { if (target(*ei, g) == v) { std::cout << "Inside " << *ei << " " << get(edge_weight, g, *ei) << std::endl; return std::make_pair(true, *ei); } } return std::make_pair(false, *ei); // Is there a null edge that I can return ? } int main(int, char *[]) { typedef adjacency_list < listS, vecS, directedS, no_property, property < edge_weight_t, int > > graph_t; typedef graph_traits < graph_t >::vertex_descriptor vertex_descriptor; typedef graph_traits < graph_t >::edge_descriptor edge_descriptor; typedef std::pair<int, int> Edge; const int num_nodes = 5; enum nodes { A, B, C, D, E }; Edge edge_array[] = { Edge(A, C), Edge(B, B), Edge(B, D), Edge(B, E), Edge(C, B), Edge(C, D), Edge(D, E), Edge(E, A), Edge(E, B) }; int weights[] = { 1, 2, 1, 2, 7, 3, 1, 1, 1 }; int num_arcs = sizeof(edge_array) / sizeof(Edge); #ifdef BOOST_MSVC graph_t g(num_nodes); property_map<graph_t, edge_weight_t>::type weightmap = get(edge_weight, g); for (std::size_t j = 0; j < num_arcs; ++j) { edge_descriptor e; bool inserted; tie(e, inserted) = add_edge(edge_array[j].first, edge_array[j].second, g); weightmap[e] = weights[j]; } #else graph_t g(edge_array, edge_array + num_arcs, weights, num_nodes); property_map<graph_t, edge_weight_t>::type weightmap = get(edge_weight, g); #endif graph_traits < graph_t >::edge_descriptor e; bool found; std::cout << "List All" << std::endl; graph_traits < graph_t >::edge_iterator ei, ei_end; for (tie(ei, ei_end) = edges(g); ei != ei_end; ++ei) { std::cout << *ei << get(weightmap, *ei) << std::endl; } std::cout << "List Not First" << std::endl; tie(found, e) = find_edge< graph_t >(E, A, g); std::cout << "Outside " << e << get(weightmap, e) << std::endl; // This edge is OK std::cout << "List First" << std::endl; tie(found, e) = find_edge< graph_t >(A, C, g); std::cout << "Outside " << e << get(weightmap, e) << std::endl; // This line fails to get the weight return EXIT_SUCCESS; } Richard Shaw ¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,ø¤ Atkins Transport Systems Woodcote Grove Ashley Road Epsom KT18 5BW Direct Dial.: +44 (0) 1372 756407 Switchboard: +44 (0) 1372 726140 Fax: +44 (0) 1372 740055 www.atkinsglobal.com/transportsystems <www.atkinsglobal.com/transportsystems> This email and any attached files are confidential and copyright protected. If you are not the addressee, any dissemination of this communication is strictly prohibited. Unless otherwise expressly agreed in writing, nothing stated in this communication shall be legally binding.

4 4

RE: [Boost-Users] Re: boost::object_pool
by scleary＠jerviswebb.com 22 Aug '02

22 Aug '02

> -----Original Message----- > From: wugui [mailto:yg-boost-users@m.gmane.org] > > another question: > > how make boost::object_pool thread_safe? To make a pool object thread-safe, guard all access with a mutex. -Steve

1 0

RE: [Boost-Users] boost::object_pool
by scleary＠jerviswebb.com 22 Aug '02

22 Aug '02

> -----Original Message----- > From: wugui [mailto:yg-boost-users@m.gmane.org] > > class A; > class B; > class AB : virtual public A, virtual public B; > > all destruct is virtual > > boost::object_pool<AB> pool_ab; > > B * pb = pool_ab.constuct(); > pool_ab.destroy(pb); // is this right? This looks right to me; what "pool_ab.destroy(pb);" does is: pb->~AB(); free(pb); // puts pb back in the free list of pool_ab -Steve

1 0

Kai C++ for Linux and Solaris
by Wintermantel , Marc 22 Aug '02

22 Aug '02

Hi everybody, We really badly need the latest version available of Kai C++ Compiler for Linux and Solaris. If someone wants to sell his copy, please write me!!! We would really be grateful. Yours truly, Marc Wintermantel Marc Wintermantel IMES - Structures Technology ETH Zurich, LEO C4 Leonhardstrasse 27 CH- 8092 Zurich Tel. ++41 1 633 35 32 Fax. ++41 1 632 17 02 [Non-text portions of this message have been removed]

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boost::object_pool
by wugui 22 Aug '02

22 Aug '02

class A; class B; class AB : virtual public A, virtual public B; all destruct is virtual boost::object_pool<AB> pool_ab; B * pb = pool_ab.constuct(); pool_ab.destroy(pb); // is this right?

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boost lambda library compile error
by khuroth 21 Aug '02

21 Aug '02

I have searched already in this list and the dev list for these MSVC compiler errors, but none of the solutions have worked so far. I have turned off precompiled headers, built clean, tried defining BOOST_NO_MEMBER_TEMPLATES before including "boost/lambda/lambda.hpp" (or "boost/lambda/bind.hpp"), and I still always get this error under Visual C++ 6 SP5 (Win2k Pro SP3), in both the Debug and Release configurations: Deleting intermediate files and output files for project 'dWin - Win32 Release'. --------------------Configuration: dWin - Win32 Release--------------- ----- Compiling... dwin-button.cpp dwin-common-control.cpp dwin-dialog.cpp C:\TMP\BOOST\BOOST_1_28_0\boost/lambda/detail/lambda_fwd.hpp(31) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 1794) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information Not sure what I'm doing wrong..

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Boost Concept Check Library
by igor_bashkirov 21 Aug '02

21 Aug '02

Hello, I work on big software project that is ported to several platforms/compilers, including Linux,Solaris/GCC 2.95.2,3.0.4); Windows/MSVC 6.0; AIX/VisualAge; MacOS X / GCC 2.95.2 (Apple). Recently, I decided to make use of Boost library (v 1.28) and the first thing I tried was Boost Concept Check Library (BCCL). Unfortunately, the use of the library wasn't as smooth as I expected, namely, with respect to BOOST_CLASS_REQUIRES macro. Thus, I'd like to submit a couple of observations and one proposal regarding usage of this macro. Let's start with observations: following is the snippet from <boost/concept_check.hpp> header: [code // The BOOST_CLASS_REQUIRES macros use function pointers as // template parameters, which VC++ does not support. #if defined(BOOST_NO_FUNCTION_PTR_TEMPLATE_PARAMETERS) #define BOOST_CLASS_REQUIRES(type_var, concept) .... #else #define BOOST_CLASS_REQUIRES(type_var, concept) \ typedef void (concept <type_var>::* func##type_var##concept)(); \ .... end code] As you could see, BOOST_CLASS_REQUIRES macros evaluate to nothing if BOOST_NO_FUNCTION_PTR_TEMPLATE_PARAMETERS symbol is defined. But, to my great surprise, I didn't find any more references to BOOST_NO_FUNCTION_PTR_TEMPLATE_PARAMETERS symbol throughout the Boost library. Moreover, the above comment about VC++ not supporting function pointers as template parameters is wrong (at least for MSVC 6.0 with SP5). Not to be unfounded, I will provide following sample program successfully compiled and run under MSVC 6.0 with SP5: [code #include <iostream> using namespace std; typedef void(*FP)(); template <FP T> class X { FP fp_; public: X() : fp_(T) {} void print() const { cout << fp_ << endl; } }; void f() {} int main(int, char**) { X<&f> x1; x1.print(); return 0; } end code] The same is true for pointers to member functions of both ordinary and template classes. OK, this observation could be treated as "cosmetic" one, but the following won't. Let's look at the definition of BOOST_CLASS_REQUIRES macro: [code #define BOOST_CLASS_REQUIRES(type_var, concept) \ typedef void (concept <type_var>::* func##type_var##concept)(); \ template <func##type_var##concept _Tp1> \ struct concept_checking_##type_var##concept { }; \ typedef concept_checking_##type_var##concept< \ BOOST_FPTR concept <type_var>::constraints> \ concept_checking_typedef_##type_var##concept end code] and at a typical usage of this macro (taken from Boost documentation): [code template <class T> struct generic_library_class { BOOST_CLASS_REQUIRES(T, EqualityComparableConcept); // ... }; end code] Here, the "EqualityComparableConcept" is a concept checking class defined in the "boost" namespace. OK, that's great and works fine until "generic_library_class" is also declared in the "boost" namespace. Let's now suppose "generic_library_class" is declared in namespace "ns1". Then, BOOST_CLASS_REQUIRES macro evaluates to following: [code namespace ns1 { template <class T> struct generic_library_class { typedef void (EqualityComparableConcept <T>::* funcTEqualityComparableConcept)(); ... }; } end code] Did you see the problem places? Yes, it's where "concept" parameter of the macro is substituted for "EqualityComparableConcept". This name is not declared in the namespace "ns1"! The first itch could be to specify "boost::EqualityComparableConcept" as a value of the second parameter of the macro, but, "not so fast, Skywalker!" - in this case we will end up with "funcTboost::EqualityComparableConcept" name for the pointer to member function that is not a legal name of C/C++ identifier. Someone could say "What a big deal?! Just write 'using namespace boost;' or 'using boost::EqualityComparableConcept;' just before declaring 'generic_library_class'.". Well, the declaration of "generic_library_class" seems to be in the header, right? And what do you think about writing "using-directives" in header files? Yes, right, - it's evil! Especially for large production code. Just check your favorite C++ book. Though, the use of "using-declarations" in headers is a moot point, I also consider it as evil for the same reasons as for "using- directives". Anyway, "using-declarations" won't help us, - they just don't work under MSVC 6.0 in our case. So, what do we have, - "exclusive circle"? I hope not. Finally, I got to the proposal that should help us to eliminate defects of the macro and to obviate above-stated difficulties. What if to add one more parameter, say, "ns", to the BOOST_CLASS_REQUIRES macro to pass the name of the namespace the concept checking class belongs to? Let's look at the new definition of the macro: [code #define BOOST_CLASS_REQUIRES(type_var, ns, concept) \ typedef void (ns::concept <type_var>::* func##type_var##ns##concept) (); \ template <func##type_var##ns##concept _Tp1> \ struct concept_checking_##type_var##ns##concept { }; \ typedef concept_checking_##type_var##ns##concept< \ BOOST_FPTR ns::concept <type_var>::constraints> \ concept_checking_typedef_##type_var##ns##concept; end code] and at it's usage: [code namespace ns1 { template <class T> struct generic_library_class { BOOST_CLASS_REQUIRES(T, boost, EqualityComparableConcept); // ... }; } end code] that will evaluate to the following: [code namespace ns1 { template <class T> struct generic_library_class { typedef void (boost::EqualityComparableConcept <T>::* funcTboostEqualityComparableConcept)(); ... }; } end code] That's it. Moreover, this solution does not suffer from yet another drawback inherent to the original one, viz, name clashing when using in the same class concept checking classes with the same name, but from different namespaces. The only issue I could see with my suggestion was impossibility to use concept checking classes declared at the global scope, but, I hope nobody would think of such thing, because it's evil (sorry for repetition). I hope the proposed solution will increase usability of the BCCL. Best regards, Igor Bashkirov.

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Upgrade VisC++ compiler
by sen_al2002 20 Aug '02

20 Aug '02

Hi, I am a newbie to all this programmer stuff. I am a physics student doing some computer simulations. I was trying to use the special function atanh from boost libraries but couldn't. The error message reads d:\boost_1_28_0\atanh.hpp(77) : error C2989: 'atanh_helper1_t<T,0>' : template class has already been defined as a non-template class Some advised me to update my VisC++ ver 6.0 compiler. How can I do that? Does anybody out there have any better advise? Thanks sen

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boost python link error
by kiminkim 20 Aug '02

20 Aug '02

I want to export C++ class...use boost lib but link error occured... help me. #include <windows.h> #include <boost/python/class_builder.hpp> #include <string> namespace python = boost::python; class CBaseBox { public: CBaseBox() {}; void move(); private: std::string a; }; void CBaseBox::move() { MessageBox(NULL, "kkm", "kkm", MB_OK); } BOOST_PYTHON_MODULE_INIT(tuesday) { python::module_builder this_module("tuesday"); python::class_builder<CBaseBox> CBaseBox_class(this_module, "CBaseBox"); CBaseBox_class.def(&CBaseBox::move , "move"); } --------------------Configuration: tuesday - Win32 Debug-------------------- Compiling... export.cpp Linking... Creating library pyds\./tuesday_d.lib and object pyds\./tuesday_d.exp export.obj : error LNK2001: unresolved external symbol "class CBaseBox & __cdecl from_python(struct _object *,struct boost::python::type<class CBaseBox &>)" (?from_python@@YAAAVCBaseBox@@PAU_object@@U?$type@AAVCBaseBox@@@python@boost @@@Z) pyds\.\tuesday_d.pyd : fatal error LNK1120: 1 unresolved externals Error executing link.exe.

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Boost Python error handling
by cseymour＠interchange.ubc.ca 19 Aug '02

19 Aug '02

Here is a sample program which shows the problem i've been having (posted in earlier messages). When I import the module "sample" and run the function test(), I get the following output: This is a test Raising an error Aborted When I should get a message saying it caught the error, and then a Python error, instead of it Aborting and quitting Python. /* sample.c */ #include "Python.h" #include "boost/python/class_builder.hpp" namespace py = boost::python; void test() { std::cout << "This is a test" << std::endl; std::cout << "Raising an error" << std::endl; PyErr_SetString(PyExc_TypeError, "This is the error"); throw py::argument_error(); } BOOST_PYTHON_MODULE_INIT(sample) { try { py::module_builder this_module("sample"); this_module.def(test, "test"); } catch (...) { std::cout << "Caught an error" << std::endl; py::handle_exception(); } }

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Newbie and shared_ptr
by Ian Mold 19 Aug '02

19 Aug '02

I have been looking at the shared_ptr class, and I have made a change to include an assignment from a standard pointer. I have done this so that I don't have to create a new shared_ptr just to reassign an existing shared_ptr. // Assignment to a 'normal' pointer. shared_ptr & operator=(T * r) { this_type(r).swap(*this); return *this; } I have a few questions. 1) Is this necessary? 2) Does this do the job? 3) Is there any reason this wasn't included in the first place? I welcome any comments. Regards, IanM

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