- Boost-users - lists.boost.org

boost thread on x64
by Pascal Kesseli 11 Sep '09

11 Sep '09

Hi friends Using the freshly created MinGW 64bit build, creating the boost 1.40 libraries with bjam worked flawlessly. However, when including boost/thread.hpp, I receive the following error: In file included from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/win32/basic_timed_mutex.hpp:14, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/win32/mutex.hpp:8, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/mutex.hpp:14, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/detail/thread.hpp:11, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/thread.hpp:22, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread.hpp:13, from ../src/main/com/emc/schedule/DailyRepetitiveTaskComposite.cpp:2: C:\Program Files\C++\boost\boost_1_40_0/boost/thread/win32/interlocked_read.hpp: In function 'void boost::detail::interlocked_write_release(void* volatile*, void*)': C:\Program Files\C++\boost\boost_1_40_0/boost/thread/win32/interlocked_read.hpp:71: error: cast from 'void*' to 'long int' loses precision In file included from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/win32/mutex.hpp:8, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/mutex.hpp:14, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/detail/thread.hpp:11, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread/thread.hpp:22, from C:\Program Files\C++\boost\boost_1_40_0/boost/thread.hpp:13, from ../src/main/com/emc/schedule/DailyRepetitiveTaskComposite.cpp:2: C:\Program Files\C++\boost\boost_1_40_0/boost/thread/win32/basic_timed_mutex.hpp: In member function 'void* boost::detail::basic_timed_mutex::get_event()': C:\Program Files\C++\boost\boost_1_40_0/boost/thread/win32/basic_timed_mutex.hpp:152: error: cast from 'void*' to 'long int' loses precision make: *** [src/main/com/emc/schedule/DailyRepetitiveTaskComposite.o] Error 1 However, on the stated line, I can't even make out a cast. Is boost_thread win64 compatible? g++ version: g++.exe (GCC) 4.4.1 20090505 (prerelease) Copyright (C) 2009 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Thanks for any help and best regards Pascal

2 1

Re: [Boost-users] RE : [lambda] for thread bind
by Boost lzw 10 Sep '09

10 Sep '09

Thanks. bind(&test_thread, s) works. How can I bind one boost::thread to another boost::thread? Here is what I want to do: void work_thread() { cout << "done" << endl; } void test_thread(boost::thread& t) { while (t.joinable()) { // do sth. this_thread::sleep(seconds(2)); } } int main() { boost::thread work_thread(work_thread); // this line does not compile boost::thread inquiry_thread(bind(&test_thread, work_thread ) ); work_thread.join(); inquiry_thread.join(); return 0; } Thanks in advance. Robert On Thu, Sep 10, 2009 at 4:24 PM, Eric MALENFANT < Eric.Malenfant(a)sagem-interstar.com> wrote: > Boost lzw wrote: > [snip] > > but the lambda version does not compile. Why? Thanks. > > ------------------------------------- > > > void test_thread(std::string s) > > { > > cout << "string is" << s << endl; > > } > > > > std::string s("I am a string"); > > boost::thread inquiry_thread(bind(test_thread, _1)(s) ); > > > > bind(test_thread, _1) creates a functor expecting one argument. Appending > "(s)" right after invokes that functor, passing it s as an argument. > > What you want is: bind(&test_thread, s) > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

2 1

[lambda] for thread bind
by Boost lzw 10 Sep '09

10 Sep '09

Hi there, I am playing with lambda. This following code works: ------------------------------------- void test_thread(std::string s) { cout << "string is" << s << endl; } boost::thread enquiry_thread(test_thread, s ); ------------------------------------- but the lambda version does not compile. Why? Thanks. ------------------------------------- #include"boost/lambda/lambda.hpp" #include"boost/lambda/bind.hpp" using namespace boost::lambda; void test_thread(std::string s) { cout << "string is" << s << endl; } std::string s("I am a string"); boost::thread inquiry_thread(bind(test_thread, _1)(s) );

2 1

Status of Boost.Extension from sandbox?
by Rex Kerr 10 Sep '09

10 Sep '09

I'm evaluating various plugin solutions for a project and am considering boost.extension as one of the alternatives. Looking at http://boost-extension.blogspot.com/ and the mailing list archives it appears that the project hasn't been active for a while. I have tried, unsuccessfully, to find a page detailing the current status of sandbox projects to determine whether or not it has been accepted for inclusion in future boost versions, has significant flaws preventing its inclusion, etc. I'm hesitant to choose a project that may be orphaned. Any guidance in finding such status updates, or outright answers to my questions, would be helpful. Thank you, -Rex

4 6

[thread]
by Alexander Heinrich 10 Sep '09

10 Sep '09

I want to determine if a given thread is still running or has already completed. I thought the joinable() method would provide this information, but unfortunately it seems that a thread does not automatically become Not-A-Thread after completion. I wrote a small app to verify this: <code> #include <iostream> using namespace std; #include <boost/thread.hpp> #include <boost/thread/mutex.hpp> #include <boost/date_time/posix_time/posix_time_types.hpp> using namespace boost; using namespace boost::posix_time; mutex ioMutex; void f() { mutex::scoped_lock lock(ioMutex); cout << "done" << endl; } int main(int argc, char** argv) { boost::thread t(f); while (t.joinable()) { { mutex::scoped_lock lock(ioMutex); cout << "not yet done" << endl; } this_thread::sleep(seconds(2)); } return 0; } </code> Output: not yet done done not yet done not yet done ... So what should I do instead if I want to know if a thread is still running? Best regards, Alexander Heinrich

2 1

transform_iterator requirement on the Iterator?
by Hicham Mouline 10 Sep '09

10 Sep '09

Hi, >From the docs, I don't see the Iterator argument is required to be default-constructible. I have a gcc4.3.3 error stack that looks like: /usr/include/boost-1_37/boost/iterator/iterator_adaptor.hpp: In constructor 'boost::iterator_adaptor<Derived, Base, Value, Traversal, Reference, Difference>::iterator_adaptor() [with Derived = boost::transform_iterator<Math::Curve1D<MathTest::Curve1D::CurveSVOTrait>::G etXIter, Math::CurveContainerIter<std::pair<double, double>, 4u, true>, boost::use_default, boost::use_default>, Base = Math::CurveContainerIter<std::pair<double, double>, 4u, true>, Value = const double, Traversal = boost::use_default, Reference = const double&, Difference = boost::use_default]': /usr/include/boost-1_37/boost/iterator/transform_iterator.hpp:100: instantiated from 'boost::transform_iterator<UnaryFunction, Iterator, Reference, Value>::transform_iterator() [with UnaryFunc = Math::Curve1D<MathTest::Curve1D::CurveSVOTrait>::GetXIter, Iterator = Math::CurveContainerIter<std::pair<double, double>, 4u, true>, Reference = boost::use_default, Value = boost::use_default]' /usr/lib/gcc/x86_64-redhat-linux/4.3.3/../../../../include/c++/4.3.3/bits/st l_algo.h:2086: instantiated from '_FIter std::lower_bound(_FIter, _FIter, const _Tp&) [with _FIter = boost::transform_iterator<Math::Curve1D<MathTest::Curve1D::CurveSVOTrait>::G etXIter, Math::CurveContainerIter<std::pair<double, double>, 4u, true>, boost::use_default, boost::use_default>, _Tp = double]' _____ math/interExtrapolators/interExtrapolate.hpp:75: instantiated from 'typename std::iterator_traits<fIterType>::value_type Math::InterExtrapolators::InterExtrapolate(xIterType, xIterType, fIterType, typename std::iterator_traits<_OI>::value_type, typename boost::call_traits<T>::param_type, typename boost::call_traits<Extrap>::param_type) [with Interp = Math::InterExtrapolators::StairCase1D, Extrap = Math::InterExtrapolators::StairCase1D, xIterType = boost::transform_iterator<Math::Curve1D<MathTest::Curve1D::CurveSVOTrait>::G etXIter, Math::CurveContainerIter<std::pair<double, double>, 4u, true>, boost::use_default, boost::use_default>, fIterType = boost::transform_iterator<Math::Curve1D<MathTest::Curve1D::CurveSVOTrait>::G etFIter, Math::CurveContainerIter<std::pair<double, double>, 4u, true>, boost::use_default, boost::use_default>]' ... mathTest/curve1D.cpp:72: instantiated from here /usr/include/boost-1_37/boost/iterator/iterator_adaptor.hpp:279: error: no matching function for call to 'Math::CurveContainerIter<std::pair<double, double>, 4u, true>::CurveContainerIter()' where it seems the compiler is looking for CurveContainerIter() with no arguments. but such constructor does not exist because the iterator has a member reference to the container. Or is this a requirement of std::lower_bound? Basically, the last line of the stack that is my code is xIterType xiter = std::lower_bound( xbegin, xend, x ); where xIterType is typedef boost::transform_iterator<GetXIter,ContainerConstIterType> xIterType; GetXIter is a unary function object, and ContainerConstIterType is CurveContainerIter<..., true> , true being for const'ness of the iterator. Xbegin, xend and x all of xIterType Regards,

2 3

[ptr_container] Transferring the Last Element from a ptr_vector
by Charles Brockman 10 Sep '09

10 Sep '09

I have two functions which swap elements between ptr_vectors. The first compiles and apparently works correctly. typedef boost::ptr_vector<Gene> GeneVectType; GeneVectType geneVect; void Gene::swapGene(Gene* other) { geneVect.transfer(geneVect.end(), other->geneVect.begin(), other->geneVect); other->geneVect.transfer(other->geneVect.end(), geneVect.begin(), geneVect); } Occasionally I must reverse the swap with this unswap function. void Gene::unswapGene(Gene* other) { // The line below is line 560 referred to in the error message. geneVect.transfer(geneVect.begin(), other->geneVect.rbegin(), other->geneVect); other->geneVect.transfer(other->geneVect.begin(), geneVect.rbegin(), geneVect); } This function should take the last element from each container and transfer it to the beginning of the other container. The unswapGene function will not compile. Here's the compiler message. C:\Boost SVN\trunk\boost/range/const_iterator.hpp(37) : error C2039: 'const_iterator' : is not a member of 'boost::reverse_iterator<Iterator>' with [Iterator=boost::void_ptr_iterator<std::_Vector_iterator<void *,std::allocator<void *>>,genprg::Gene>] C:\Boost SVN\trunk\boost/mpl/eval_if.hpp(63) : see reference to class template instantiation 'boost::range_const_iterator<C>' being compiled with [C=boost::reverse_iterator<boost::void_ptr_iterator<std::_Vector_iterator<void *,std::allocator<void *>>,genprg::Gene>>] C:\Boost SVN\trunk\boost/range/iterator.hpp(63) : see reference to class template instantiation 'boost::mpl::eval_if_c<C,F1,F2>' being compiled with [C=true, F1=boost::range_const_iterator<boost::reverse_iterator<boost::void_ptr_iterator<std::_Vector_iterator<void *,std::allocator<void *>>,genprg::Gene>>>, F2=boost::range_mutable_iterator<const boost::reverse_iterator<boost::void_ptr_iterator<std::_Vector_iterator<void *,std::allocator<void *>>,genprg::Gene>>>] C:\Boost SVN\trunk\boost/ptr_container/ptr_sequence_adapter.hpp(458) : see reference to class template instantiation 'boost::range_iterator<C>' being compiled with [C=const boost::reverse_iterator<boost::void_ptr_iterator<std::_Vector_iterator<void *,std::allocator<void *>>,genprg::Gene>>] ..\..\..\..\GSSTA\gene.cpp(560) : see reference to function template instantiation 'void boost::ptr_sequence_adapter<T,VoidPtrSeq,CloneAllocator>::transfer<genprg::Gene::GeneVectType,boost::reverse_iterator<Iterator>>(boost::void_ptr_iterator<VoidIter,T>,const Range &,PtrSeqAdapter &)' being compiled with [T=genprg::Gene, VoidPtrSeq=std::vector<void *,std::allocator<void *>>, CloneAllocator=boost::heap_clone_allocator, Iterator=boost::void_ptr_iterator<std::_Vector_iterator<void *,std::allocator<void *>>,genprg::Gene>, VoidIter=std::_Vector_iterator<void *,std::allocator<void *>>, Range=boost::reverse_iterator<boost::void_ptr_iterator<std::_Vector_iterator<void *,std::allocator<void *>>,genprg::Gene>>, PtrSeqAdapter=genprg::Gene::GeneVectType] Can anyone see what I'm doing wrong? -- Charles

6 11

[boost::multi_array] Is there simple method to delete certain row / column?
by Vladimir Petorov 10 Sep '09

10 Sep '09

Hello! I got two-dimensional array class based on boost::multi_array class. I need to delete some certain column or row of it. How to delete it with keeping the data? For example I have 2D array 6x6, and i need to delete 3th row and 4th column with keeping data from other rows and columns. Is it simple method (multi_array class function or some smart method) or should i create new array 5x5 and copy data in it except 3th row and 4th column? Thanks!

1 0

[BGL] DistanceMatrix type for johnson_all_pairs_shortest_paths
by Ralf Goertz 10 Sep '09

10 Sep '09

Hi, I spent a lot of time to figure out what the problem was. But the reason why there is a problem is still not clear. I modified the johnson_all_pairs_shortest_paths example program to allow for non-constant graphs. The example prog contained std::vector < int >d(V, (std::numeric_limits < int >::max)()); int D[V][V]; johnson_all_pairs_shortest_paths(g, D, distance_map(&d[0])); with V being const int whose value is known at compile time. In my program this is obviously not the case, therefore I defined const int V(num_vertices(g)); std::vector < int >d(V, (std::numeric_limits < int >::max)()); int D[V][V]; johnson_all_pairs_shortest_paths(g, D, distance_map(&d[0])); But this didn't compile, I got the error error: no matching function for call to ‘johnson_all_pairs_shortest_paths(Graph&, int [(long int)V][(long int)V], boost::bgl_named_params<int*, boost::vertex_distance_t, boost::no_property>)’ However, it is possible to access elements of D as D[i][j], even if V isn't known at compile time. This is (according to what I read at http://www.boost.org/doc/libs/1_39_0/libs/graph/doc/BasicMatrix.html ) the only constrained for D. Substituting int D[V][V] with vector<vector<int> > D(V,vector<int>(V)) solves the problem, but still why is there a problem in the first place? Ralf

3 3

Solaris Container
by Bernhard Duebi 10 Sep '09

10 Sep '09

Hello, I'm not a programmer, I'm only a system engineer, so please be gentle. One of our code producers compiled boost in a Solaris Zone/Container using SUN Studio. For testing he used a program called test. I guess it is part of the distribution. It tests if 2+2==4 with different calls to boost. The test program runs on real machines, but not in Containers. Looking at the output of truss I found a probable cause. The program climbs up the process tree using the proc filesystem until it reaches the root of the tree. In a real machine the init process has PID 1 and this seems the sign for the program to stop climbing. In a Container the zsched process has a random PID and its PPID is the same as the PID. This leads to an endless loop. In the test.cpp file there is not much code besides the add function and some calls to the boost library. So, I guess the process tree walk is done somewhere in the boost library. My fellow co-worker denies this strictly. As we both have no clue about boost, I want to ask you to sched some light on this incident. - Is it possible that boost does that process tree walk ? - Is this a known problem ? - Are there any hints how to solve this problem ? I talked to SUN and they say it's not their problem. There is no official whitepaper that requires that the init process always has PID 1. Any help is appreciated Sincerely Bernhard -- Minds are like parachutes They only function when open

6 8