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Another lambda question
by Maximilian Wilson 01 Sep '04

01 Sep '04

I am getting another compiler error when trying to use the lambda library. Current experiment is string extraction. I'm trying to create a lambda(x) that pushes any char passed to it onto a particular string. string s2; void (std::string::*ft)(char) = &std::string::push_back; // extract function pointer because push_back is overloaded char c = 'n'; bind<void>(ft, var(s2), _1, 1)(c); // should push one 'n' onto the string. However, it doesn't compile bind<void>(reinterpret_cast<char(std::string::*)(char)>(ft), var(s2), _1, 1)(c); // error messages made me think it might be because push_back returns void // I know this isn't good practice, but I'm just trying to figure out what's wrong // However, this won't compile either. And then I get this error /users/user2/ugrad/m/mdw45/boost_1_31_0/boost/lambda/detail/actions.hpp:109: error: no matching function for call to `boost::lambda::function_adaptor<char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*)(char)>::apply(char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const&)(char), std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, char&, const int&)' I'm not really sure what the real problem is. Can you tell from looking at the error message what I should be doing? Thanks in advance Max Wilson (FULL ERROR TEXT FOLLOWS) /usr/include/boost/lambda/detail/actions.hpp: In static member function `static RET boost::lambda::function_action<4, T>::apply(A1&, A2&, A3&, A4&) [with RET = void, A1 = char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const)(char), A2 = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, A3 = char, A4 = const int, T = void]': /usr/include/boost/lambda/detail/lambda_functor_base.hpp:442: instantiated from `RET boost::lambda::lambda_functor_base<boost::lambda::action<4, Act>, Args>::call(A&, B&, C&, Env&) const [with RET = void, A = char, B = const boost::tuples::null_type, C = const boost::tuples::null_type, Env = const boost::tuples::null_type, Act = boost::lambda::function_action<4, void>, Args = boost::tuples::tuple<char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const)(char), const boost::lambda::lambda_functor<boost::lambda::identity<std::string&> >, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, const int, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>]' /usr/include/boost/lambda/detail/lambda_functors.hpp:151: instantiated from `typename T::sig<boost::tuples::tuple<A&, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::type boost::lambda::lambda_functor<Base>::operator()(A&) const [with A = char, T = boost::lambda::lambda_functor_base<boost::lambda::action<4, boost::lambda::function_action<4, void> >, boost::tuples::tuple<char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const)(char), const boost::lambda::lambda_functor<boost::lambda::identity<std::string&> >, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, const int, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >]' proj1.cpp:180: instantiated from here /usr/include/boost/lambda/detail/actions.hpp:109: error: no matching function for call to `boost::lambda::function_adaptor<char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*)(char)>::apply(char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const&)(char), std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, char&, const int&)' /usr/include/boost/lambda/detail/actions.hpp:109: error: return-statement with a value, in function declared with a void return type bash-2.05b$ g++ proj1.cpp -I /users/user2/ugrad/m/mdw45/boost_1_31_0 /users/user2/ugrad/m/mdw45/boost_1_31_0/boost/lambda/detail/actions.hpp: In static member function `static RET boost::lambda::function_action<4, T>::apply(A1&, A2&, A3&, A4&) [with RET = void, A1 = char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const)(char), A2 = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, A3 = char, A4 = const int, T = void]': /users/user2/ugrad/m/mdw45/boost_1_31_0/boost/lambda/detail/lambda_functor_base.hpp:442: instantiated from `RET boost::lambda::lambda_functor_base<boost::lambda::action<4, Act>, Args>::call(A&, B&, C&, Env&) const [with RET = void, A = char, B = const boost::tuples::null_type, C = const boost::tuples::null_type, Env = const boost::tuples::null_type, Act = boost::lambda::function_action<4, void>, Args = boost::tuples::tuple<char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const)(char), const boost::lambda::lambda_functor<boost::lambda::identity<std::string&> >, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, const int, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>]' /users/user2/ugrad/m/mdw45/boost_1_31_0/boost/lambda/detail/lambda_functors.hpp:151: instantiated from `typename T::sig<boost::tuples::tuple<A&, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::type boost::lambda::lambda_functor<Base>::operator()(A&) const [with A = char, T = boost::lambda::lambda_functor_base<boost::lambda::action<4, boost::lambda::function_action<4, void> >, boost::tuples::tuple<char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const)(char), const boost::lambda::lambda_functor<boost::lambda::identity<std::string&> >, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, const int, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >]' proj1.cpp:180: instantiated from here /users/user2/ugrad/m/mdw45/boost_1_31_0/boost/lambda/detail/actions.hpp:109: error: no matching function for call to `boost::lambda::function_adaptor<char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*)(char)>::apply(char (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::*const&)(char), std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, char&, const int&)' /users/user2/ugrad/m/mdw45/boost_1_31_0/boost/lambda/detail/actions.hpp:109: error: return-statement with a value, in function declared with a void return type -- Sometimes I think decisions through, weigh the consequences, decide it is not a good idea, but blind myself and make it anyway. I do not think this is a good thing to do, but it might be. Humans are endowed with both reason and emotion for a reason. -Tara Greenwood

2 2

boost::graph adding verticies and edges whilst performing a dfs
by Daren Grant 01 Sep '04

01 Sep '04

Greetings all , I have a quick question regarding the boost graph library and depth first search operations. I have a very large graph , which has a visitor attached to the depth_first_search routine. The Visitor may add in more verticies / Edges when visiting an existing vertex in the Graph. (NOTE :: All the added verticies / edges from the visitor are guaranteed to be higher in the graph structure! i.e. the DFS algorithm would not have processed them at time of insertion. ) My question is can the depth_first_search handle changes to the Graph whilst it is performing its operation ? From my observations of the colour map used I dont think this is possible with the core depth_first_search routine in the library , could someone confirm this , and if anyone has ideas on how this can be performed I would be most grateful to hear their thoughts !

3 4

Guidelines for effective exception usage
by Stephen torri 01 Sep '04

01 Sep '04

Are there any guidelines on where and when to use exceptions? Are there any boost components that deal with exceptions? Stephen -- Email: storri(a)torri.org

11 28

internal properties and subgraphs.
by Jeffrey Holle 31 Aug '04

31 Aug '04

I've been experimenting with subgraphs. At present, they look quite useful in what I'm trying to do, but I've questions. If I add custom vertex and edge properties to my base graph, can I access these through a subgraph, using local vertex/edge descriptors? If not, is there a way of obtaining the mapping between global and local vertex/edge descriptors?

1 2

interal properites with boost.graph question
by Jeffrey Holle 31 Aug '04

31 Aug '04

I've apparently succeeded in switching from external to internal properites in my application. However, I've done things in an OOP way, and would like to know if somebody can point out potential trouble. I've a class, called Graph, that inherits from the boost::graph object. The start of its definition is: class Graph : public GraphT { public: Graph(); // Graph Data accessor methods typedef boost::property_map<GraphT, vertex_Datum_t>::type VertexData; typedef boost::property_map<GraphT, edge_Datum_t>::type EdgeData; const VertexData& getVertexData(void) const {return vertexData_;} ... private: VertexData vertexData_; }; Note the typedef of VertexData. I initialize vertexData_ in the Graph constructor like this: vertexData_ = boost::get(vertex_Datum, *this); I've numerous methods like this in Graph: Vertex DataGraph::add_vertex(LayoutVertex *pLayoutVertex) { Vertex vertex = boost::add_vertex(*this); boost::put(vertexData_,vertex,Vertex_Datum(pLayoutVertex)); return vertex; } I guess my biggest concern is initializing vertexData_ once, before the graph has any data, and keeping it around though the life of the graph. Is this safe? Also, I expect clients of this class to be able to use the operator[] method via getVertexData(). Will this work?

5 5

problem compiling with threads and stlport
by Nicholas Cain 31 Aug '04

31 Aug '04

hi, I'm new to boost, stlport and programming on linux in general, so I apologise now for any obvious beginner errors! I'm using mandrake 10 and gcc 3.3.2, and using root I created STLport 4.6.2 libraries, and then created all the boost 1.31.0 libraries using bjam -sTOOLS=gcc-stlport -sBUILD="debug release <stlport-iostream>on" install I had to have this little lot in my bashrc file to do it; export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib export STLPORT_VERSION=4.6.2 export STLPORT_ROOT=/home/ncain export STLPORT_LIB_DIRECTORY=/usr/local/lib export STLPORT_INCLUDE_DIRECTORY=/usr/local/include/ export PYTHON_VERSION=2.3 export PYTHON_ROOT=/usr Everything seemed to build ok, apart from an "../lib/libstlport_gcc_debug.so does not exist" error in the final part of the stlport build and a continual "warning: "_POSIX_C_SOURCE" redefined" warning during the boost build. Both the stlport and boost libraries are in /usr/local/lib ok, and building thread/test passed fine too. I altered one of the tutorial files to use _STL and also created a makefile (since bjam is a bit beyond me at the moment), and these appear as; testboost.cpp: #include <boost/thread/thread.hpp> #include <boost/thread/xtime.hpp> #include <iostream> using namespace _STL; struct thread_alarm { thread_alarm(int secs) : m_secs(secs) { } void operator()() { cout << "alarm sounded..." << endl; } int m_secs; }; int main(int argc, char* argv[]) { int secs = 5; thread_alarm alarm(secs); boost::thread thrd(alarm); thrd.join(); } makefile: .PHONY: all clean ALL = testboost INCS = -I"/usr/local/include/stlport" \ -I"/usr/local/include/boost-1_31" LIBS=-L"/usr/local/lib" -lstlport_gcc -lboost_thread-gcc-mt-p -lpthread .cpp: ${CXX} ${INCS} -pthread -o $@ $^ ${LIBS} all: ${ALL} clean: ${RM} core* *.o ${RM} ${ALL} make returns this error; g++ -I"/usr/local/include/stlport" -I"/usr/local/include/boost-1_31" -pthread -o testboost testboost.cpp -L"/usr/local/lib" -lstlport_gcc -lboost_thread-gcc-mt-p -lpthread /home/ncain/tmp/ccZWBPnj.o(.text+0x4b): In function `main': : undefined reference to `boost::thread::thread[in-charge](boost::function0<void, _STL::allocator<boost::function_base> > const&)' collect2: ld returned 1 exit status make: *** [testboost] Error 1 using -lboost_thread-gcc-mt-gdp makes no difference, however changing the cpp to use the std libraries works fine (builds and runs correctly). Have I made a mistake in building the boost libraries or possibly in my makefile? thanks, nik

4 8

installing boost
by Fred J. 31 Aug '04

31 Aug '04

Hello I am stuck, here is my info, thanks much boost install steps for i686-pc-Linux debian-GNU/Linux 2.6.8 # ls /var/boost/ boost-jam-3.1.10-1-linuxx86.tgz boost_1_31_0.tar.bz2 debian:/var/boost# tar -xvzf boost-jam-3.1.10-1-linuxx86.tgz debian:/var/boost# tar -jxf boost_1_31_0.tar.bz2 debian:/var/boost/boost-jam-3.1.10-1-linuxx86# cp bjam /usr/local/bin/ debian:/var/boost/boost-jam-3.1.10-1-linuxx86# which bjam /usr/local/bin/bjam debian:~# which gcc /usr/bin/gcc debian:~# bjam -sGCC_ROOT_DIRECTORY="" Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from /root up to the root and in these directories from BOOST_BUILD_PATH and BOOST_ROOT: /usr/share/boost-build. Please consult the documentation at 'http://www.boost.org'. debian:~# __________________________________ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail

4 4

pthread, futex_wait hang
by Matt Paindavoine. 30 Aug '04

30 Aug '04

Hello, I have been using the spirit parser library, and other boost pieces (date, test, variant, ...), along with Mozilla. I recently merged in some parts of the application that were running separately, and the program started hanging. I did a bit of searching, but couldn't find anything significantly wrong, especially since the individual parts are working correctly. The problem seems to be related to threads, as the stack indicates (cf stack at the end), and as the strace output shows here: parsing:*****************************: ) = 240 time([1093872322]) = 1093872322 futex(0x4045b860, FUTEX_WAIT, 2, NULL) = -1 EAGAIN (Resource temporarily unavailable) futex(0x4045b860, FUTEX_WAIT, 2, NULL) = -1 EAGAIN (Resource temporarily unavailable) [... ad vitam eternam] I compiled this program using gcc (GCC) 3.4.1 (Debian 3.4.1-7) using -DBOOST_MPL_NO_PREPROCESSED_HEADERS -DBOOST_SPIRIT_DEBUG -fPIC -I/usr/X11R6/include -frtti -fexceptions -Wall -Wconversion -Wpointer-arith -Wcast-align -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wno-long-long -pedantic -fshort-wchar -pthread -pipe -DDEBUG -D_DEBUG -DDEBUG_root -DTRACING -g -fno-inline -I/usr/X11R6/include -DMOZILLA_CLIENT -include I don't know exactly what those threads are doing behind my back, but I'd appreciate if someone could provide some suggestion for fixing this problem. Thanks. Matt stack: #0 0x4040c791 in pthread_setcanceltype () from /lib/tls/libc.so.6 #1 0x4045b860 in __after_morecore_hook () from /lib/tls/libc.so.6 #2 0x4045aedc in ?? () from /lib/tls/libc.so.6 #3 0x00000031 in ?? () #4 0x4039ad63 in posix_memalign () from /lib/tls/libc.so.6 #5 0x00000012 in ?? () #6 0x409c91fc in ~lightweight_mutex (this=0x819eb40) at lwm_pthreads.hpp:53 #7 0x409c9d24 in ~sp_counted_base_impl (this=0x819eb40) at nsCXExpRecord.cpp:219 #8 0x409c96e2 in boost::detail::sp_counted_base::destruct (this=0x819eb40) at shared_count.hpp:115 #9 0x409b2a7e in boost::detail::sp_counted_base::weak_release (this=0x819eb40) at shared_count.hpp:173 #10 0x409bd6de in boost::detail::weak_count::operator= (this=0x40b3bb3c, r=@0x41749188) at shared_count.hpp:492 #11 0x409bd68f in boost::weak_ptr<boost::spirit::impl::grammar_helper<boost::spirit::grammar<cx::FooFooRecordGrammar<cx::FooConfigFooRecordGrammar>, boost::spirit::closure_context<cx::FooFooRecordClosure<cx::FooConfigFooRecordGrammar> > >, cx::FooFooRecordGrammar<cx::FooConfigFooRecordGrammar>, boost::spirit::scanner<__gnu_cxx::__normal_iterator<char const*, std::string>, boost::spirit::scanner_policies<boost::spirit::iteration_policy, boost::spirit::match_policy, boost::spirit::action_policy> > > >::operator=<boost::spirit::impl::grammar_helper<boost::spirit::grammar<cx::FooFooRecordGrammar<cx::FooConfigFooRecordGrammar>, boost::spirit::closure_context<cx::FooFooRecordClosure<cx::FooConfigFooRecordGrammar> > >, cx::FooFooRecordGrammar<cx::FooConfigFooRecordGrammar>, boost::spirit::scanner<__gnu_cxx::__normal_iterator<char const*, std::string>, boost::spirit::scanner_policies<boost::spirit::iteration_policy, boost::spirit::match_policy, boost::spirit::action_policy> > > > (this=0x40b3bb38, r=@0x41749184) at weak_ptr.hpp:87 #12 0x409bc67a in grammar_helper (this=0x41749170, p=@0x40b3bb38) at grammar.ipp:156 [ goes further up, I don't know if it will help... ]

2 2

BLL and member variables
by Mattias Brändström 30 Aug '04

30 Aug '04

Hello, I really like the BLL and would like to use it as much as possible. I have run into a small problem though. My code looks like this: #include <boost/lambda/bind.hpp> #include <boost/lambda/lambda.hpp> #include <map> #include <vector> class A { public: A(int a, int b) : a_(a), b_(b) { } int a_; int b_; }; int main() { using namespace boost::lambda; std::vector<A> v; v.push_back(A(1, 2)); typedef std::map<int, int> Map; Map m; for_each(v.begin(), v.end(), bind(&Map::insert, std::make_pair(bind(&A::a_, _1), bind(&A::b_, _1)))); return 0; } What I want to do is to populate a map with the information from the vetctor v. For each element in v I want to insert a value and a key into the map something like this: void operator()(const A& a) const { m_.insert(std::make_pair(a.a_, a.b_)); } I found some information on how to use member variables as targets in the BLL documentation and that is what I have tried to use in the code above. It won't compile however, using g++ I get the following error: g++ -c -o test.o test.cpp test.cpp: In function `int main()': test.cpp:27: error: no matching function for call to `bind(<unknown type>, std::pair<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<int A::*, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified> >, boost::tuples::tuple<int A::*, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > > >)' scons: *** [test.o] Error 1 scons: building terminated because of errors. If someone here has any ideas of how to accomplish this it would be really nice! Thanks in advance! Regards, Mattias

2 1

downloading problems
by Fred J. 30 Aug '04

30 Aug '04

Hello I am trying to download a boost library from http://sourceforge.net/project/showfiles.php?group_id=7586 where the library name suppost to be, there is [show only this release] instead, the wholl page, all the library names are not listed. any body is having the same problem or it is just me thanks _______________________________ Do you Yahoo!? Win 1 of 4,000 free domain names from Yahoo! Enter now. http://promotions.yahoo.com/goldrush

2 1

Re: [boost] Re: MPL vector size limit
by Aleksey Gurtovoy 30 Aug '04

30 Aug '04

Arkadiy Vertleyb writes: > Sorry to repeat this question, but I think I am missing somehing here: > > Do I understand correctly that it's not possible in the current > version of MPL to use mpl::vector of a size larger than 50? It is possible. As I tried to explain in my previous reply, you can pre-generate the coressponding headers up to whatever limit you choose. You can also generate the sequence "on the fly", although that's less efficient. > > If this is not correct, what exactly do I have to do to use, for > example, mpl::vector97<...>? #include "boost/mpl/vector/vector50.hpp" #include "boost/mpl/aux_/config/vector.hpp" #include "boost/mpl/aux_/config/ctps.hpp" #include "boost/preprocessor/iterate.hpp" #include "boost/config.hpp" namespace boost { namespace mpl { #define BOOST_PP_ITERATION_PARAMS_1 \ (3,(51, 100, "boost/mpl/vector/aux_/numbered.hpp")) #include BOOST_PP_ITERATE() }} > > If this _is_ correct, I would like to make a feature request for it > to be increased, since the limit of 50 doesnt seem to be high enough > (I am making this statement in conjunction with the need of my > typeof emulation lib, but I am kind of surprized this question > hasn't yet popped up in other contexts, or has it?). We are using sequences of ~70 elements here at work (mostly in context of FSMs), but then we simply pre-generate them locally. Increasing the default limit to, let's say, 100 elements means plus ~120 KB to the size of the distribution, and I'm not sure the need is widespread enough to make everybody pay for it. > In particular, isn't it possible to just get it fully controlled by > BOOST_MPL_LIMIT_VECTOR_SIZE without any limitations whatsoever? Once again, tweaking BOOST_MPL_LIMIT_VECTOR_SIZE is a dubious practice. You can get as long of a sequence as you want with the technique demostrated in the example above, with a caveat that it's going to be less efficient than using pre-generated headers. -- Aleksey Gurtovoy MetaCommunications Engineering

2 1

Using external property map with a mutable boost.graph
by Jeff Holle 30 Aug '04

30 Aug '04

I'm using a boost.graph via: typedef boost::adjacency_list<boost::vecS,boost::vecS,boost::bidirectionalS> GraphT; In my application, I've decided to use external maps. I have discovered a problem using vertex descriptors as a key of a map. Basically, in doing a remove_vertex sequence involving vertex descriptors 5, 3, 2, I discovered that the next vertex descriptor produced by add_vertex was 4. At this point the insert into my map failed because this element already existed. Given the mutable nature of vertex descriptors, I don't see how they can be used as a key in a map. I'm contemplating two options at this point. 1. Switch from map to vector in storing my vertex property externally. 2. Switch to internal properties. My questions are: 1. Is the first option viable? As I see things, vertex descriptors are always contiguous and in the range (0..num_vertices(graph)]. Is this true? 2. Do internal "maps" avoid this type of problem?

2 1

date_time bug cvs latest vc7.1
by Gordon Smith 29 Aug '04

29 Aug '04

The following sample will not compile with the following settings (I know it has been discussed with regards to the regex library previously) - this code compiles fine in 1_31: "Character set": "Use Multi-Byte Character Set" (I am targetting win 95/98) "Treat wchar_t as Built-in Type (/Zc:wchar_t)": "No" The contrived example demonstrates why I can't turn "/Zc:wchar_t" on: #include "stdafx.h" #include <comutil.h> #include <boost/date_time/gregorian/gregorian.hpp> int _tmain(int argc, _TCHAR* argv[]) { _variant_t var("Narrow String"); return 0; } begin 666 boost_bug_001.zip M4$L#!!0````(`&A9$C&80G7MR@````\!```1````8F]O<W1?8G5G7S P,2YC M<'!5CD%+Q# 0A<\&\A^&>MD52>K5E071@R</ZDTD9-,T'6@G83I=%?&_V^Q% MO7WO8^;QK(5#SK.XPY)<VUZ94 I<PWWLD>(,,D2()/P))2,)])E/+F2:\QC! MES)B\(*9C%;6:J75.5(8ERY",TOG^P\S-/_T3<C3(CB:8?_7GF;8SDMT@E.T MB6/*C)Y^R0RE[&M7G>)D\DB;BIY3N 3W<O=P^W11T_'U;:O5EU9G[NCKISB! ME3;-HV?.[_ LC)2:[6X]X2@+$[0K?_\`4$L#!!0````(`%!6$C$O3O0P5P$` M`),#```1````8F]O<W1?8G5G7S P,2YS;&Z=D,UKPC 8QL\6^C^$GAR8DFCM MZF&'IA]CA\%0V([2CR(a)962)-*AO._WVI5ITZF'H(29XW[^]]\CRSHI)*SC1X M9:K..)CHNF023"2O-9,"I(S3'DAE]9&9-[12C1BX"-G62R7?::&[SBH@T2A* M2 `#XH40XQC!(,88(A2B:(1-U>NOG3OP`)Q<2J6G>3V?(H2=WHG@+HN%H3;Z M:NCA*"+W'D1ID$+/1Q@&89I GY!1WP_]88(':\>V.JV/B5G&7+>]QG1!14E% MP:AJ)B_,F+9D>A)1'K?9UD&RK4<N\XR;=]O##KU+)9)BQN9UE367#;RBNYII MZL34_,?(F[T1QI333%$CM:>MA2/ZV;36S?DP\Y/?TRY+RMV8<4/#7M)HMK?W M_<;$H'\UA]2,ERZZF=+F<.2GU6YF'3R=DO[-.OG45"B6,\[TU[:D_LCZ.DY8 MED_B,LQ>L:T?4$L#!!0````(`%!6$C&SGO.4R0```"P!```*````<W1D869X M+F-P<&60O6[#, R$=P-^AT,ZUT[7; 6"HEN&9.@6T!)=*U!(03]H_/:17:-+ MUR._XQW['BE;&A^="0$')"W1,$;G&7FB#"?&%\L)MY)RE;CNDUB*]F_4-GV/ M037EZU"^K_O]6Q?,A!_G/09>F1#YU>@]5%N+B<ER7*GMM@ZWWW6CDLG)?R;/ M@>O!4>.=LE-IF[9YV0)@M]E,NT6NMI?3\71 Y)$C2ZU#,H.L=0M)?@N0,&N! M,"]-<+X<WS^^NL^5KP4ANI2O25Q:W]$V3U!+`P04````" !05A(QJ,6F9;L` M```E`0``" ```'-T9&%F>"YH58_!BL,P#$3O@?S#P%Y+<R]+3WOO97] :\NQ M2V)G91F:OZ]<*&TO`FF>1J-I0E5/X7:,."%EMS3/"&FQ4L0TRI[$H^Y5>?T` MZF$<I@E&;5*N[!1U8Y="<I\8-)*"A-$J>P3A_\99E_V OZ8/CRZZ2'DV/>47 MT<5Q&(>O36A>"24[[KU-GB>^4ZDJ3.OY?:CF)L=X[JCY_UY^+B<(!Q8V"Y#W M25/)M" R>9:*O;3'([/0BAX@B46/MC .=U!+`0(4"Q0````(`&A9$C&80G7M MR@````\!```1``````````$`( ````````!B;V]S=%]B=6=?,# Q+F-P<%!+ M`0(4"Q0````(`%!6$C$O3O0P5P$``),#```1``````````$`( ```/D```!B M;V]S=%]B=6=?,# Q+G-L;E!+`0(4"Q0````(`%!6$C&SGO.4R0```"P!```* M``````````$`( ```'\"``!S=&1A9G@N8W!P4$L!`A0+% ````@`4%82,:C% MIF6[````)0$```@``````````0`@````< ,``'-T9&%F>"YH4$L%!@`````$ -``0`[ ```%$$```````` ` end

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boost::thread callback copy problem
by Howard Cole 27 Aug '04

27 Aug '04

Hi, I am new to boost::thread but have come across the following problem and wondered if anyone could help... The problem is the copy overhead used by the boost::thread / boost::function0 code. The following code actually creates multiple copies of myclass rather than using a reference to myclass and due to the size of the class, this leads to a considerable overhead. I only noticed this problem because the thread kept failing due to the fact that my constructor held some socket initialisation code, which was being called multiple times. Is there a way that I can force the thread class to use references rather than copying? Looking at the code for the function library, I see that you can use boost::ref for function classes, any ideas as to how it can be used in the thread class? Thanks in advance Howard Cole www.selestial.com Example code. class myclass { public: // Lots of local data here void operator() () { do_thread_stuff(); }; // CTOR myclass(){ do_some_initialisation_stuff(); }; // DTOR ~myclass(){ do_some_cleanup_stuff(); }; // Lots of member funcs ... }; void main (void){ myclass test_instance; boost::thread test_thread(test_instance); test_thread.join(); }

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RE: [Boost-users] Re: Guidelines for effective exception usage
by Mark Storer 26 Aug '04

26 Aug '04

> No it is not. Even if you aren't throwing due to memory starvation, > you could run out of memory during unwinding, when the exception is > copied. That leads you directly to terminate(). Do not pass Go; do > not collect $200. Venturing a little far afield, but one technique I've heard of is to grab a block, so you can release it in low-memory situations (or just every time you throw). This ensures (in theory) that you'll have enough memory to copy your exception, create your strings, and so on. If you manage to recover, you just grab another block ("prime the pump") and soldier bravely forward. Given STL's habit of allowing people to specify an allocator, you could even go so far as to build a custom allocator that worked on some pre-allocated block of memory for your exceptions (strings, vectors, whatever you deem necessary). Either way, you'll run out of memory a little earlier (not a big issue in many environments), but you _will_ get to pocket the $200. It's not hard to imagine an environment where grabbing a couple extra Kb would be a Bad Thing, but I'd think this trick would be fine on PCs and the like. --Mark Storer Senior Software Engineer Verity, Inc.

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Generative Programming book
by Samuel 26 Aug '04

26 Aug '04

The ISBN for the "Generative Programming" book is wrong. 0-210-30977-7 is incorrect 0-201-30977-7 is correect That book is used and described in the Boost "Feature Model Diagrams in text and HTML" page. Also, the Generative Programming web site isn't working for me, but perhaps the problem is only temporary. Note that I am not asking for help with any of that. I obviously already know what the correct ISBN is. I am posting this in case it helps others; the web page needs to be updated for the ISBN at least. The Boost "What to do about Boost bugs" page says to submit "a bug report to either boost-users list, boost mailing list, or our bug tracking facility at SourceForge" and that "either of the mailing lists is a preferred way". However it does not describe what a bug report is. If there is not a formal format, then I hope the above is adequate.

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/usr/include/boost/mpl/if.hpp:75: internal compiler error: Segmentation fault
by Nils Wagner 26 Aug '04

26 Aug '04

Dear experts, I am going to install VPython http://www.vpython.org/linux_download.html on SuSE 9.1 which makes use of the boost library. However I got a segmentation fault. /usr/include/boost/mpl/if.hpp:75: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://www.suse.de/feedback> for instructions. Preprocessed source stored into /tmp/ccrXaXyw.out file, please attach this to your bugreport. Any pointer would be appreciated. Nils

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Boost Build, custom-built targets
by John Meinel 26 Aug '04

26 Aug '04

Hello all- I'm currently using Boost Build v1 for some of my projects. I must say, it's significantly better than Makefiles. Overall, I'm quite pleased, though it took a little while to learn. I haven't been able to figure out one thing, though. How to generate custom built targets. Basically, I want to auto-generate a C++ source file so that I can keep track of version information. I have a python script that determines the version information from various sources (such as the revision control system [arch]), and I would like it to be run before my library is built. If I was using a makefile I would do something like this: .PHONY: version.cpp version.cpp: generate_version.py version ./generate_version.py This would cause version.cpp to be generated fresh each time the build process was called. However, I don't really need the ".PHONY", it would be okay if it was only created whenever one of the other files changed. I'm sure it's possible to do this with bjam, I just haven't figured out how to do customized stuff like this yet. Thanks, John =:-> PS> Is there a better mailing list for this?

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RE: [Boost-users] Re: Guidelines for effective exception usage
by Ben Hutchings 25 Aug '04

25 Aug '04

Peter Dimov <pdimov(a)mmltd.net> wrote: > Ben Hutchings wrote: > > Peter Dimov <pdimov(a)mmltd.net> wrote: > >> Victor A. Wagner Jr. wrote: > >>> > >>> OK, blunt point. > >>> the standard is (insert favorite expletive or "in error") if it > >>> allows use of std::runtime_error to terminate the program due to > >>> low memory situations (run out of memory (due to copying) during > >>> stack unwinding). > >> > >> It does not allow such a thing. > > > > This is an known and unresolved issue: > > http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#254 > > "The copy constructors of all exception-derived classes already have > a no throw spec. Reference 18.6.1, 19.1 and 15.4/13." "As they stand, the copy constructors might fail via a call to unexpected. I think what is intended here is that the copy constructors can't fail." (Is it really necessary for us to quote the referenced text at each other? This is silly.)

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RE: [Boost-users] Re: Guidelines for effective exception usage
by Ben Hutchings 25 Aug '04

25 Aug '04

Peter Dimov <pdimov(a)mmltd.net> wrote: > Victor A. Wagner Jr. wrote: > > > > OK, blunt point. > > the standard is (insert favorite expletive or "in error") if it > > allows use of std::runtime_error to terminate the program due to low > > memory situations (run out of memory (due to copying) during stack > > unwinding). > > It does not allow such a thing. This is an known and unresolved issue: <http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#254>

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Update: exception class that
by Stephen torri 25 Aug '04

25 Aug '04

I thought I would share what I am using for exceptions given the excellent advice from everyone responding to my initial email. There is no usages of any memory allocation or std::string like variables. If there are any 'oops' or 'gotchas' please let me know. My plan is to use a command flag for taking into a value. The value will determine what debug messages are reported at the cause of the problem. The message will be displayed via std::cerr. Stephen ---------------- Header ---------------- #ifndef IO_EXCEPTION_H_ #define IO_EXCEPTION_H_ #include <exception> #include <inttypes.h> namespace kurt { /*! * \class IOException * \brief Rather than inheriting from ifstream this class delegates * any required functionality to it. * \date 2003 * \author Stephen Torri */ class IO_Exception : public virtual std::exception { public: IO_Exception (uint32_t message_id); /*! * \brief Destructor */ virtual ~IO_Exception (void) throw(){} /*! * \brief Return the extra message accompanying the exception. */ const char* what (void) const throw(); /*! * \brief Return tne name of the exception */ const char* name (void) const throw(); enum { CANNOT_OPEN, INPUT_CORRUPTED, INVALID_IO_OP, READ_ERROR, UNSUPPORTED_OP, WRITE_ERROR, }; private: static const char* m_exception_name; static const char* m_messages[]; uint32_t m_id; }; } /* namespace kurt */ ------------- Source ------------- #include "IOException.hpp" namespace kurt { const char* IO_Exception::m_exception_name = "IO_Exception"; const char* IO_Exception::m_messages [] = { "I/O Error: cannot open", // CANNOT_OPEN "Input data is corrupted", // INPUT_CORRUPTED "Invalid i/o operation attempted", // INVALID_IO_OP "Error reading input", // READ_ERROR "Unsupported I/O operation", // UNSUPPORTED_OP "Error writing output", // WRITE_ERROR }; IO_Exception::IO_Exception (uint32_t message_id) : std::exception(), m_id(message_id) {} const char* IO_Exception::what (void) const throw() { return m_messages[m_id]; } const char* IO_Exception::name (void) const throw() { return m_exception_name; } } /* namespace kurt */ #endif /* IO_EXCEPTION_H_ */ -- Email: storri(a)torri.org

1 0

MPL vector size limit
by Arkadiy Vertleyb 25 Aug '04

25 Aug '04

Hi, Can BOOST_MPL_LIMIT_VECTOR_SIZE be increased beyond 50, and if yes, what is involved in this? Thanks, Arkadiy

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licenses...
by MarC 24 Aug '04

24 Aug '04

Hi I subscribed to this list to find out if I can publish one program containig "Boost Filesystem Library" under the GPL2. I saw that Boost license is even more flexible than the GPL2 but I'm not sure if I can release a program containing Boost with GPL2... anybody knows? where should I ask to answer my question? my case is that I'm developping a stand-alone console program which I want to integrate in other GPL licensed projects of web developpment like quanta.sourceforge.net or screem.sourceforge.net. I don't mind about modifying the licene of my program to adapt it to the special license of "Boost Filesystem Library" but I think it's inaffordable to modify all licenses of big projects like quanta or screem... so I'm a little bit confused. any idea? thanks in advance!

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boost.graph build problem in latest anonomous CVS update.
by Jeff Holle 24 Aug '04

24 Aug '04

I've just refreshed my boost via CVS and ran into a build problem with gcc v3.4.1. Initially, seems like everything failed on my system. However, I discovered that there is now a configure option :-) . After installing user.hpp where it does some good stuff, the bjam of the root of boost succeeded. However, in running bjam in $ROOT_BOOST/libs/graph/build. This Jamfile is configured to build both release and debug version of bgl-viz. It fails with similiar problems that I was getting elsewhere before I ran configure. An example of the problems is: boost/config/stdlib/libstdcpp3.hpp:33: error: expected unqualified-id before '<<' token boost/config/stdlib/libstdcpp3.hpp:33: error: expected `,' or `;' before '<<' token

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can the boost multi-array be easily extended to std::map's?
by Steven L. Scott 24 Aug '04

24 Aug '04

I'm working on an application (a data analysis system built in C++) for which it would be helpful to have nested (multidimensional) containers other than ordinary arrays. I have defined a generic 'data' class which I like to store in std::vector<data *>'s. For a very simple example, a 'data' might be a double representing a student's score on an exam, or in more complex settings it might be some sort of spatial map, or a multidimensional set of records for a medical patient. I am interested in structures where 'data' is nested across multiple levels. For example, test scores are nested within students, students nested within teachers, nested within school districts, etc. For a single layer of nesting a std::map<std::string, std::vector<data *> > seems to be an ideal way to store such data, largely because text strings can be used to identify subjects: dat["johnny"] // returns a std::vector of pointers to johnny's test scores. This is often the way that data are stored in files to be analyzed. I'm looking for some sort of C++ container that is more convenient for multiply nested data than std::map<std::string, std::map<std::string .... , std::vector<data *> > > ... >, but which will allow me to write expressions like: dat["LAUSD"]["Central High"]["Ms. Jones' Class"]["Johnny"] // same vector as above. Can something like the Boost multi-array package be extended to handle this?

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