September 2015 - Boost-users - lists.preview.boost.org

[interprocess] Determine size of managed_shared_memory
by Kai Benndorf 12 Oct '19

12 Oct '19

Hi all, I want to create a managed_shared_memory in exactly the size I needed. Therefore I do something like this: size = sizeof( common_managed_shared_memory ); size += sizeof( MyClassInSharedMem ); managed_shared_memory segment(create_only, "name", size ); MyClassInSharedMem allocates itself some memory by segment->allocate(). I added this also to the size, but get a boost::interprocess::bad_alloc exception on allocating this additional memory. Are there some magic bytes I forgot to add? Many thanks in advance Kai

3 2

Weird compilation error when using boost::geometry
by 邓尧 16 Nov '17

16 Nov '17

Hi, I have implemented my own "point" as specified by the point concept http://www.boost.org/doc/libs/1_59_0/libs/geometry/doc/html/geometry/refere… When I use it along with boost::geometry::model::polygon/multi_polygon, GCC refuses to compile, tested on GCC 4.9/5.2. What's even more weird is that CLANG 3.6 would happy accept my code. BTW, the Point implementation is part of a large project, it difficult to replace it with boost::geometry::model::point. Here is my code: Point.hpp > #ifndef RAPTOR_POINT_HPP_INCLUDED_ > > #define RAPTOR_POINT_HPP_INCLUDED_ > > >> #include <boost/mpl/int.hpp> > > #include <boost/geometry/core/access.hpp> > > #include <boost/geometry/core/cs.hpp> > > #include <boost/geometry/core/coordinate_type.hpp> > > #include <boost/geometry/core/coordinate_system.hpp> > > #include <boost/geometry/core/coordinate_dimension.hpp> > > #include <boost/geometry/geometries/polygon.hpp> > > #include <boost/geometry/multi/geometries/multi_polygon.hpp> > > >> namespace raptor { > > >> template<typename T, int tDimension = 2> > > class Point { > > public: > > Point() = default; > > >> Point(T a, T b) { > > data[0] = a; > > data[1] = b; > > } > > >> Point(T a, T b, T c) { > > data[0] = a; > > data[1] = b; > > data[2] = c; > > } > > >> T& operator [] (long index) { > > return data[index]; > > } > > >> const T& operator [] (long index) const { > > return data[index]; > > } > > >> private: > > T data[tDimension]; > > }; > > >> using CubicPoint = Point<long, 3>; > > using PlanarPoint = Point<long>; > > using SphericalPoint = Point<double>; > > >> template<typename T> > > using Polygon = boost::geometry::model::polygon<T>; > > >> template<typename T> > > using PolySet = boost::geometry::model::multi_polygon<Polygon<T>>; > > >> } // namespace raptor > > >> namespace boost { namespace geometry { namespace traits { > > >> template<typename Type, std::size_t tDimension> > > struct tag<::raptor::Point<Type, tDimension>> { > > typedef point_tag type; > > }; > > >> template<typename Type, std::size_t tDimension> > > struct coordinate_type<::raptor::Point<Type, tDimension>> { > > typedef Type type; > > }; > > >> template<typename Type, std::size_t tDimension> > > struct coordinate_system<::raptor::Point<Type, tDimension>> { > > typedef boost::geometry::cs::cartesian type; > > }; > > >> template<typename Type, std::size_t tDimension> > > struct dimension<::raptor::Point<Type, tDimension>> > > : public boost::mpl::int_<tDimension> { > > // EMPTY > > }; > > >> template<typename Type, std::size_t tDimension, std::size_t tIndex> > > struct access<::raptor::Point<Type, tDimension>, tIndex> { > > static Type get(const ::raptor::Point<Type, tDimension>& p) { > > return p[tIndex]; > > } > > >> static void set(::raptor::Point<Type, tDimension>& p, > > const Type& value) { > > p[tIndex] = value; > > } > > }; > > >> }}} // namespace boost::geometry::traits > > >> #endif // RAPTOR_POINT_HPP_INCLUDED_ > > A real simple main.cpp: > #include "Point.hpp" > > >> int main() { > > raptor::Polygon<raptor::SphericalPoint> pl; > > raptor::PolySet<raptor::SphericalPoint> set; > > return sizeof(pl) + sizeof(set); > > } > > > GCC compilation error: g++ main.cpp -std=c++14 > In file included from /usr/include/boost/geometry/core/access.hpp:20:0, from Point.hpp:5, from main.cpp:1: /usr/include/boost/geometry/core/point_type.hpp: In instantiation of > 'struct boost::geometry::traits::point_type<raptor::Point<double> >': /usr/include/boost/geometry/core/point_type.hpp:66:17: required from > 'struct boost::geometry::core_dispatch::point_type<void, > raptor::Point<double> >' /usr/include/boost/geometry/core/coordinate_type.hpp:58:62: required from > 'struct boost::geometry::core_dispatch::coordinate_type<void, > raptor::Point<double> >' /usr/include/boost/geometry/core/coordinate_type.hpp:92:25: required from > 'struct boost::geometry::coordinate_type<raptor::Point<double> >' /usr/include/boost/geometry/geometries/concepts/point_concept.hpp:90:54: > required from 'class boost::geometry::concept::Point<raptor::Point<double> > >' /usr/include/boost/concept/detail/has_constraints.hpp:32:62: required by > substitution of 'template<class Model> boost::concepts::detail::yes > boost::concepts::detail::has_constraints_(Model*, > boost::concepts::detail::wrap_constraints<Model, (& Model:: constraints)>*) > [with Model = boost::geometry::concept::Point<raptor::Point<double> >]' /usr/include/boost/concept/detail/has_constraints.hpp:42:5: required from > 'const bool > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >::value' /usr/include/boost/concept/detail/has_constraints.hpp:45:31: required > from 'struct > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >' /usr/include/boost/mpl/if.hpp:67:11: required from 'struct > boost::mpl::if_<boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >, > boost::concepts::constraint<boost::geometry::concept::Point<raptor::Point<double> > > >, boost::concepts::requirement<boost::concepts::failed************ > boost::geometry::concept::Point<raptor::Point<double> >::************> >' /usr/include/boost/concept/detail/general.hpp:50:8: required from 'struct > boost::concepts::requirement_<void > (*)(boost::geometry::concept::Point<raptor::Point<double> >)>' /usr/include/boost/geometry/geometries/ring.hpp:60:5: required from > 'class boost::geometry::model::polygon<raptor::Point<double>, true, true, > std::vector, std::vector, std::allocator, std::allocator>' main.cpp:4:42: required from here /usr/include/boost/geometry/core/point_type.hpp:45:5: error: no matching > function for call to 'assertion_failed(mpl_::failed************ > (boost::geometry::traits::point_type<raptor::Point<double> > >::NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE::************)(mpl_::assert_::types<raptor::Point<double>, > mpl_::na, mpl_::na, mpl_::na>))' BOOST_MPL_ASSERT_MSG ^ /usr/include/boost/mpl/assert.hpp:82:5: note: candidate: template<bool C> > int mpl_::assertion_failed(typename mpl_::assert<C>::type) int assertion_failed( typename assert<C>::type ); ^ /usr/include/boost/mpl/assert.hpp:82:5: note: template argument > deduction/substitution failed: /usr/include/boost/geometry/core/point_type.hpp:45:5: note: cannot > convert > 'boost::geometry::traits::point_type<Geometry>::NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE48::assert_arg<raptor::Point<double> > >()' (type 'mpl_::failed************ > (boost::geometry::traits::point_type<raptor::Point<double> > >::NOT_IMPLEMENTED_FOR_THIS_POINT_TYPE::************)(mpl_::assert_::types<raptor::Point<double>, > mpl_::na, mpl_::na, mpl_::na>)') to type 'mpl_::assert<false>::type {aka > mpl_::assert<false>}' BOOST_MPL_ASSERT_MSG ^ In file included from > /usr/include/boost/geometry/core/coordinate_type.hpp:21:0, from /usr/include/boost/geometry/core/access.hpp:24, from Point.hpp:5, from main.cpp:1: /usr/include/boost/geometry/core/point_type.hpp: In instantiation of > 'struct boost::geometry::core_dispatch::point_type<void, > raptor::Point<double> >': /usr/include/boost/geometry/core/coordinate_type.hpp:58:62: required from > 'struct boost::geometry::core_dispatch::coordinate_type<void, > raptor::Point<double> >' /usr/include/boost/geometry/core/coordinate_type.hpp:92:25: required from > 'struct boost::geometry::coordinate_type<raptor::Point<double> >' /usr/include/boost/geometry/geometries/concepts/point_concept.hpp:90:54: > required from 'class boost::geometry::concept::Point<raptor::Point<double> > >' /usr/include/boost/concept/detail/has_constraints.hpp:32:62: required by > substitution of 'template<class Model> boost::concepts::detail::yes > boost::concepts::detail::has_constraints_(Model*, > boost::concepts::detail::wrap_constraints<Model, (& Model:: constraints)>*) > [with Model = boost::geometry::concept::Point<raptor::Point<double> >]' /usr/include/boost/concept/detail/has_constraints.hpp:42:5: required from > 'const bool > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >::value' /usr/include/boost/concept/detail/has_constraints.hpp:45:31: required > from 'struct > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >' /usr/include/boost/mpl/if.hpp:67:11: required from 'struct > boost::mpl::if_<boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >, > boost::concepts::constraint<boost::geometry::concept::Point<raptor::Point<double> > > >, boost::concepts::requirement<boost::concepts::failed************ > boost::geometry::concept::Point<raptor::Point<double> >::************> >' /usr/include/boost/concept/detail/general.hpp:50:8: required from 'struct > boost::concepts::requirement_<void > (*)(boost::geometry::concept::Point<raptor::Point<double> >)>' /usr/include/boost/geometry/geometries/ring.hpp:60:5: required from > 'class boost::geometry::model::polygon<raptor::Point<double>, true, true, > std::vector, std::vector, std::allocator, std::allocator>' main.cpp:4:42: required from here /usr/include/boost/geometry/core/point_type.hpp:66:17: error: no type named > 'type' in 'struct boost::geometry::traits::point_type<raptor::Point<double> > >' >::type type; ^ In file included from > /usr/include/boost/geometry/geometries/polygon.hpp:26:0, from Point.hpp:10, from main.cpp:1: /usr/include/boost/geometry/geometries/concepts/point_concept.hpp: In > instantiation of 'class > boost::geometry::concept::Point<raptor::Point<double> >': /usr/include/boost/concept/detail/has_constraints.hpp:32:62: required by > substitution of 'template<class Model> boost::concepts::detail::yes > boost::concepts::detail::has_constraints_(Model*, > boost::concepts::detail::wrap_constraints<Model, (& Model:: constraints)>*) > [with Model = boost::geometry::concept::Point<raptor::Point<double> >]' /usr/include/boost/concept/detail/has_constraints.hpp:42:5: required from > 'const bool > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >::value' /usr/include/boost/concept/detail/has_constraints.hpp:45:31: required > from 'struct > boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >' /usr/include/boost/mpl/if.hpp:67:11: required from 'struct > boost::mpl::if_<boost::concepts::not_satisfied<boost::geometry::concept::Point<raptor::Point<double> > > >, > boost::concepts::constraint<boost::geometry::concept::Point<raptor::Point<double> > > >, boost::concepts::requirement<boost::concepts::failed************ > boost::geometry::concept::Point<raptor::Point<double> >::************> >' /usr/include/boost/concept/detail/general.hpp:50:8: required from 'struct > boost::concepts::requirement_<void > (*)(boost::geometry::concept::Point<raptor::Point<double> >)>' /usr/include/boost/geometry/geometries/ring.hpp:60:5: required from > 'class boost::geometry::model::polygon<raptor::Point<double>, true, true, > std::vector, std::vector, std::allocator, std::allocator>' main.cpp:4:42: required from here /usr/include/boost/geometry/geometries/concepts/point_concept.hpp:93:10: > error: 'value' is not a member of > 'boost::geometry::dimension<raptor::Point<double> >' enum { ccount = dimension<Geometry>::value }; ^ Where is the problem ? or it's a GCC bug ? Thanks

3 4

[Range, Phoenix] What am I missing...
by Robert Jones 25 Apr '17

25 Apr '17

Hi Folks Can anyone explain the output of this program... #include <iostream> #include <boost/range/algorithm/copy.hpp> #include <boost/range/counting_range.hpp> #include <boost/range/adaptor/reversed.hpp> #include <boost/range/adaptor/transformed.hpp> #include <boost/phoenix/bind/bind_function.hpp> #include <boost/phoenix/core/argument.hpp> int f( int i ) { return i * 2; } int main( ) { using boost::adaptors::reversed; using boost::adaptors::transformed; using boost::counting_range; using boost::copy; using boost::phoenix::arg_names::_1; copy( counting_range( 1, 5 ) | reversed | transformed( f ), std::ostream_iterator<int>( std::cout, " " ) ); std::cout << std::endl; copy( counting_range( 1, 5 ) | reversed | transformed( bind( f, _1 ) ), std::ostream_iterator<int>( std::cout, " " ) ); std::cout << std::endl; } Which is... 8 6 4 2 1768406272 1768406272 1768406272 1768406272 I'm using Gcc 4.6.2 & Boost 1.53 Thx All.

3 4

[statechart] Passing parameters from event to State Local Storage
by Christophe Bourez 16 Nov '16

16 Nov '16

I need to maintain a parameter into the state local storage. This parameter is initially contained in the event that causes the transition to the target state. I give hereafter a small illustrative example. typename sc = boost::statechart; class EvTest : public sc::event<EvTest> { public: EvTest(std::size_t val) : value(val) {} std::size_t getValue() const { return this->value; } private: std::size_t value; }; class MyStateMachine; class StSource; class StTarget; class StSource : public sc::simple_state<StSource, MyStateMachine> { public: typedef sc::custom_reaction<EvTest> reactions; sc::result react(const EvTest &event) { // How to pass event.getValue() to the target state ? transit<StTarget>(); } }; class StTarget : public sc::simple_state<StTarget, MyStateMachine> { public: StTarget(std::size_t val) : val(value) {} private: std::size_t value; }; Thanks, Christophe

5 6

[Interprocess] Communication between x86 and x64 issue
by Toni Neubert 19 Feb '16

19 Feb '16

I want to communicate between different platforms using boost interprocess. I am using vc12 and boost 1.58 on windows 7. My code below is a very simple example, that should work. But it doesn't for communications between different platforms... If I create it in x64 and open in win32, the process stuck at a lock at function try_based_lock in boost/int/sync/detail/common_algorithms.hpp In the other way around: win32 create, x64 open: the process crashes at name_length in segment_manager_helper.hpp while trying to find the name in index (priv_generic_find in segment_manager). #include <iostream> #include <boost/interprocess/managed_shared_memory.hpp> int main() { namespace bip = boost::interprocess; // open in WIN32, create in x64 #ifdef _WIN32 bip::managed_shared_memory msm(bip::open_only, "TestIPC"); #elsif X64 bip::shared_memory_object::remove("TestIPC"); bip::managed_shared_memory msm(bip::create_only, "TestIPC", 4096); msm.construct<uint32_t>("Data")[1](10); #endif // Get Data and print it auto data = msm.find<uint32_t>("Data"); if (data.second == 1) { std::cout << *data.first << std::endl; } std::cin.ignore(); return 0; } Does anybody have experience in this? Thank you in advance!

3 2

multi_index::composite_key with char[]
by leyiliu 16 Dec '15

16 Dec '15

Hi,All: When I use the multi_index::composite_key with char[],I meet a error,when find a element。It seems to the make_tuple can't support the char[].Because the char[] more faster the std::string。So our project choose char[] as the column instead of std::string.So How should I do -- View this message in context: http://boost.2283326.n4.nabble.com/multi-index-composite-key-with-char-tp46… Sent from the Boost - Users mailing list archive at Nabble.com.

3 7

Re: [Boost-users] Crashing Issue
by swati upadhyaya 04 Nov '15

04 Nov '15

hi I am using like this where RunningThreads_ is vector containing boost thread object pointer(handler).I am using interrupt() for the interruption of thread interruption_point() catching that interruption then joining.everytime its crashing in join() for me but for others who have the same configuration its working fine all of us has windos 8. For me also it was working last week but this week the same piece of code is crashing. :( RunningThreads_[i].handle->interrupt(); RunningThreads_[i].handle->join(); delete RunningThreads_[i].handle; On Thu, Feb 5, 2015 at 9:31 AM, swati upadhyaya <swatiupadhyaya(a)gmail.com> wrote: > RunningThreads_[i].handle->interrupt(); > LOG4CPLUS_INFO(root, "Thread Interrupted for " << > RunningThreads_[i].app_name << " successful"); > RunningThreads_[i].handle->join(); > LOG4CPLUS_INFO(root, "Waiting for thread to exit " << > RunningThreads_[i].app_name << " successful"); > delete RunningThreads_[i].handle; > LOG4CPLUS_INFO(root, "Thread handle for " << > RunningThreads_[i].app_name << " successfully deleted"); > //RunningThreads_.erase(i); > > On Wed, Feb 4, 2015 at 12:10 AM, Vicente J. Botet Escriba < > vicente.botet(a)wanadoo.fr> wrote: > >> Le 03/02/15 09:10, swati upadhyaya a écrit : >> >> In my code join() timed_joined() is crashing, I am using these API >> after interrupt(),Same piece of code is working for others but in my system >> its crashing, >> Is there some dependency problem I am using >> Boost version: 1.55.0 >> OS: Windows 8 >> IDE: Visual Studio 2010 >> >> Hi, >> >> it could help if you post the example and the backtrace. >> >> Which version/OS/compiler use others for which this works? >> >> Vicente >> >> _______________________________________________ >> Boost-users mailing list >> Boost-users(a)lists.boost.org >> http://lists.boost.org/mailman/listinfo.cgi/boost-users >> > >

3 2

problem in configuring the environment
by arto rasimus 03 Oct '15

03 Oct '15

I have Raspberry Pi, realtime kernel in it and machinekit 2.7-0 package. Boost version is 1.55-0.What to check, since the machinekit does not find the boost? (and therefore configuration script fails) Linux raspberrypi 3.18.11+ #781 PREEMPT Tue Apr 21 18:02:18 BST 2015 armv6l GNU/Linux configure: error: boost::python is required to build LinuxCNC pi@raspberrypi /machinekit/src $ dpkg -l | grep boost ii libboost-atomic1.55-dev:armhf 1.55.0+dfsg-3 armhf atomic data types, operations, and memory ordering constraints ii libboost-atomic1.55.0:armhf 1.55.0+dfsg-3 armhf atomic data types, operations, and memory ordering constraints ii libboost-chrono1.55-dev:armhf 1.55.0+dfsg-3 armhf C++ representation of time duration, time point, and clocks ii libboost-chrono1.55.0:armhf 1.55.0+dfsg-3 armhf C++ representation of time duration, time point, and clocks ii libboost-date-time1.55-dev:armhf 1.55.0+dfsg-3 armhf set of date-time libraries based on generic programming concepts ii libboost-date-time1.55.0:armhf 1.55.0+dfsg-3 armhf set of date-time libraries based on generic programming concepts ii libboost-dev:armhf 1.55.0.2 armhf Boost C++ Libraries development files (default version) ii libboost-filesystem-dev:armhf 1.55.0.2 armhf filesystem operations (portable paths, iteration over directories, etc) in C++ (default version) ii libboost-filesystem1.55-dev:armhf 1.55.0+dfsg-3 armhf filesystem operations (portable paths, iteration over directories, etc) in C++ ii libboost-filesystem1.55.0:armhf 1.55.0+dfsg-3 armhf filesystem operations (portable paths, iteration over directories, etc) in C++ ii libboost-program-options-dev:armhf 1.55.0.2 armhf program options library for C++ (default version) ii libboost-program-options1.55-dev:armhf 1.55.0+dfsg-3 armhf program options library for C++ ii libboost-program-options1.55.0:armhf 1.55.0+dfsg-3 armhf program options library for C++ ii libboost-python-dev 1.55.0.2 armhf Boost.Python Library development files (default version) ii libboost-python1.55-dev 1.55.0+dfsg-3 armhf Boost.Python Library development files ii libboost-python1.55.0 1.55.0+dfsg-3 armhf Boost.Python Library ii libboost-serialization-dev:armhf 1.55.0.2 armhf serialization library for C++ (default version) ii libboost-serialization1.55-dev:armhf 1.55.0+dfsg-3 armhf serialization library for C++ ii libboost-serialization1.55.0:armhf 1.55.0+dfsg-3 armhf serialization library for C++ ii libboost-system-dev:armhf 1.55.0.2 armhf Operating system (e.g. diagnostics support) library (default version) ii libboost-system1.55-dev:armhf 1.55.0+dfsg-3 armhf Operating system (e.g. diagnostics support) library ii libboost-system1.55.0:armhf 1.55.0+dfsg-3 armhf Operating system (e.g. diagnostics support) library ii libboost-test-dev:armhf 1.55.0.2 armhf components for writing and executing test suites (default version) ii libboost-test1.55-dev:armhf 1.55.0+dfsg-3 armhf components for writing and executing test suites ii libboost-test1.55.0:armhf 1.55.0+dfsg-3 armhf components for writing and executing test suites ii libboost-thread-dev:armhf 1.55.0.2 armhf portable C++ multi-threading (default version) ii libboost-thread1.55-dev:armhf 1.55.0+dfsg-3 armhf portable C++ multi-threading ii libboost-thread1.55.0:armhf 1.55.0+dfsg-3 armhf portable C++ multi-threading ii libboost1.55-dev:armhf 1.55.0+dfsg-3

1 1

parallelised ODE solvers
by Vihan Pandey 01 Oct '15

01 Oct '15

Dear all, I am trying to integrate a simple 2 variable ODE system. I wanted to know which of the solvers listed here : http://www.boost.org/doc/libs/1_56_0/libs/numeric/odeint/doc/html/boost_num… are parallelised for multicore CPU’s and GPU’s? Perhaps using Thrust for the Nvidia/CUDA GPU end of things? I am principally interested if someone has managed to make/port a library for parallelised RK45 methods. Please note in later work I plan on having more ODE's - probably systems of 12-15 parameters though they will be all be first order equations. Thanks and Cheers! - vihan -- Listening to Ozzy again!

3 4

boost::sort::spreadsort::integer_sort
by v9v＠laposte.net 01 Oct '15

01 Oct '15

Hi!I'm a C++ beginner and any help would be very much appreciated.I would like to convert this "std::sort" into "boost::sort::spreadsort::integer_sort".I know that I have to write "#include <boost/sort/spreadsort/integer_sort.hpp>" inmy header instead of "#include <algorithm>" but after that, this is too difficult...Thanks!-------------------------------------------------------------------#include <iostream>#include <algorithm>using namespace std;int main() { int nb1[4] = {15, 5, 0, 20}; int nb2[4] = {99,102, 8, 2}; int indices[4]; for (short i=0; i<4; i++) indices[i]=i; sort(begin(indices), end(indices), [&](int i1, int i2) { return nb1[i1] < nb1[i2]; } ); for (short i=0; i<4; i++) cout << nb1[indices[i]] << ' '; cout <<endl; // 0 5 15 20 for (short i=0; i<4; i++) cout << nb2[indices[i]] << ' '; cout <<endl; // 8 102 99 2 return 0;}---------------------------------------------------------------------

2 1

program_option parsing error
by Marek Skalický 30 Sep '15

30 Sep '15

Hello everyone, I have a question about program_option library. If I have argv=["binaryname", "--port", "5"] and port have set default_value=6 and implicit_value=7 what should be the value of port after parsing argv? I am asking because this test https://github.com/mongodb/mongo/blob/0481c958daeb2969800511e7475dc66986fa9… is failing with boost 1.59 (with boost 1.58 it is passing). Does someone please know what changed in this new version? Thank you, Marek

2 4

Is there any support for measuring or checking resource utilization in the boost utf?
by Victor Yankee 29 Sep '15

29 Sep '15

Is there any support for measuring or checking resource utilization, especially CPU usage and memory (either absolute amounts or percentages would be ok) in the boost utf?

2 1

bug in boost or in gcc-5.2.0 ?
by renaud lepere 29 Sep '15

29 Sep '15

I have a strange problem with mingw-w64, gcc-5.2.0 in 32bits on windows in release. The following code leads to a crash (it is working in 64 bits and in debug). The adress of return in the stack seems to be broken. I was not able to reduce it more than this, and in particular I am not able to remove BOOST_CHECK_CLOSE (using BOOST_CHECK_EQUAL works). This can be either a bug in gcc (false code generation) or something else. How can I investigate ? #define BOOST_TEST_MODULE MyTest #include <boost/test/unit_test.hpp> #include <iostream> struct P { P(double x_, double y_): x(x_), y(y_) {} double x; double y; }; struct Seg { Seg(const P & o_, const P & e_): o(o_), e(e_) {} P o; P e; }; void f() { auto Check = [](const Seg & s1, const Seg & s2, bool expected_common_cut, double expected_length) { std::cerr << expected_length << std::endl; BOOST_CHECK_CLOSE(1e-3, 1e-4, .1); }; Check(Seg(P(0, 0), P(100, 0)), Seg(P(0, 0), P(100, 0)), false, 0.0); Check(Seg(P(0, 0), P(100, 0)), Seg(P(100, 0), P(0, 0)), true, 100.0); std::cerr << "STILL LEAVING !" << std::endl; } void g() { std::cerr << "BEFORE CRASH" << std::endl; f(); std::cerr << "NEVER PRINTED" << std::endl; } BOOST_AUTO_TEST_CASE( my_test ) { g(); }

2 3

Heap: what is expected from T?
by Akim Demaille 28 Sep '15

28 Sep '15

Hi, I'm using a heap whose elements are value_type from a map; hence the key type is const. Some heaps seem to accept this gracefully, other just fail to compile. Is this expected? I saw no requirement about T in the documentation. This is Boost 1.59 from Mac Ports, on OS X. $ cat foo.cc #include <tuple> #include <string> #include <boost/heap/priority_queue.hpp> #include <boost/heap/fibonacci_heap.hpp> int main() { using datum_t = std::tuple<const std::string>; { using queue_t = boost::heap::fibonacci_heap<datum_t>; auto q = queue_t{}; q.emplace("foo"); } { using queue_t = boost::heap::priority_queue<datum_t>; auto q = queue_t{}; q.emplace("foo"); } } $ clang++-mp-3.7 -std=c++11 /tmp/foo.cc -isystem /opt/local/include In file included from /tmp/foo.cc:1: /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/tuple:283:19: error: no viable overloaded '=' value = _VSTD::forward<_Tp>(__t); ~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~ /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/tuple:485:45: note: in instantiation of function template specialization 'std::__1::__tuple_leaf<0, const std::__1::basic_string<char>, false>::operator=<const std::__1::basic_string<char> >' requested here __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<_Tp>(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t).get()))...); ^ /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/tuple:498:29: note: in instantiation of member function 'std::__1::__tuple_impl<std::__1::__tuple_indices<0>, const std::__1::basic_string<char> >::operator=' requested here class _LIBCPP_TYPE_VIS_ONLY tuple ^ /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/algorithm:4848:5: note: in instantiation of function template specialization 'std::__1::__sift_up<boost::heap::detail::heap_base<std::__1::tuple<const std::__1::basic_string<char> >, std::__1::less<std::__1::tuple<const std::__1::basic_string<char> > >, false, unsigned long, false> &, std::__1::__wrap_iter<std::__1::tuple<const std::__1::basic_string<char> > *> >' requested here __sift_up<_Comp_ref>(__first, __last, __comp, __last - __first); ^ /opt/local/include/boost/heap/priority_queue.hpp:261:14: note: in instantiation of function template specialization 'std::__1::push_heap<std::__1::__wrap_iter<std::__1::tuple<const std::__1::basic_string<char> > *>, boost::heap::detail::heap_base<std::__1::tuple<const std::__1::basic_string<char> >, std::__1::less<std::__1::tuple<const std::__1::basic_string<char> > >, false, unsigned long, false> >' requested here std::push_heap(q_.begin(), q_.end(), static_cast<super_t const &>(*this)); ^ /tmp/foo.cc:17:7: note: in instantiation of function template specialization 'boost::heap::priority_queue<std::__1::tuple<const std::__1::basic_string<char> >, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::emplace<char const (&)[4]>' requested here q.emplace("foo"); ^ /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/string:1376:19: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const basic_string& operator=(const basic_string& __str); ^ /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/string:1379:19: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const basic_string& operator=(basic_string&& __str) ^ /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/string:1383:45: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const _LIBCPP_INLINE_VISIBILITY basic_string& operator=(const value_type* __s) {return assign(__s);} ^ /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/string:1384:19: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const basic_string& operator=(value_type __c); ^ /opt/local/libexec/llvm-3.7/bin/../include/c++/v1/string:1387:19: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const basic_string& operator=(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());} ^ 1 error generated. Thanks in advance.

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[multi_index_container] Using equal_range with hashed indices
by Muruganand Karthikeyan 28 Sep '15

28 Sep '15

Hello! std::equal_range requires that the container be pre-sorted ( http://www.cplusplus.com/reference/algorithm/equal_range/) How does multi-index container handle this scenario with respect to hashed non-unique indices. The reason I ask is since I'm facing a situation with equal_range. Please see below code - typedef bmi< UserIdEntry, indexed_by< hashed_non_unique<tag<id1_id2>, composite_key<UserIdEntry, BMI_MEMBER(UserIdEntry, std::string, id1), BMI_MEMBER(UserIdEntry, std::string, id2) > > > > UserIdContainer; typedef UserIdContainer::index<id1_id2>::type IndexById1Id2; typedef IndexById1Id2::const_iterator IndexById1Id2_it; std::pair<IndexById1Id2_it, IndexById1Id2_it> entries = indexById1Id2.equal_range(make_tuple(id1_val, id2_val)); I'm seeing that *sometimes* entries.first equals indexById1Id2.end() and entries.second does not equal indexById1Id2.end(). The lookup is valid - meaning I've verified that there is at-least one entry which should be caught by the equal_range. I'm guessing the iterators' values are swapped. (second should be pointing to first and first should be pointing to second) What could be the reason for this? Thanks, MK.

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[multi_index_container] Using modify_key vs modify
by Muruganand Karthikeyan 28 Sep '15

28 Sep '15

Hello! Under what circumstances should we use modify_key? I believe we can achieve the same result using modify, so what is the advantage in using modify_key? Thanks, MK. -- Anand's signature

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Crash in managed_shared_memory
by Abhishek Kumar Pandey 28 Sep '15

28 Sep '15

Hi, I am using managed_shared_memory in my program. The program runs fine if only one instance is used. However if more than one instance is used then one instance dies randomly. The instance dies at the following code : char_string key_object(keyHashStr.c_str(), alloc_inst3); The sample program is : ----------------------- #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <boost/interprocess/containers/string.hpp> #include <string> #include <iostream> #define RESERVED_BUFFER_SIZE_WRITE (8 * 0x0100000) namespace bip = boost::interprocess; //Typedefs of allocators and containers typedef bip::allocator<char, bip::managed_shared_memory::segment_manager> char_allocator; typedef bip::basic_string<char, std::char_traits<char>, char_allocator> char_string; int main() { bip::managed_shared_memory m_sharedMemUsage(bip::open_or_create, "MyBookkeeper", 2 * RESERVED_BUFFER_SIZE_WRITE); char_allocator alloc_inst3(m_sharedMemUsage.get_segment_manager()); for (int count = 0; count < 100000; ++count) { char_string key_obect("AAAAAAAAAAAAAAAAAAAAAAA", alloc_inst3); } } ----------------------- Please let me know if I am missing something in this program. Regards, Abhishek

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annoying warnings with mingw-w64 gcc-5.2.0
by renaud lepere 27 Sep '15

27 Sep '15

When I compile my code with gcc version 5.2.0 (x86_64-posix-seh-rev0, Built by MinGW-W64 project), I have annoying warnings with boost/utf and boost/asio (1.59). For example if I compile this simple file : #define BOOST_TEST_MODULE ExactSuite #include "boost/test/unit_test.hpp" I get : c:\Users\Renaud\nest\external\boost_1_59_0/boost/test/unit_test_log.hpp:130:28: warning: 'boost::unit_test::{anonymous}::unit_test_log' defined but not used [-Wunused-variable] BOOST_TEST_SINGLETON_INST( unit_test_log ) I can add #pragma GCC diagnostic ignored "-Wunused-variable" just before the include but it seems strange (and I have to do it in few other files). Does someone have similar problem ? or a better fix ?

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Become a Library Maintainer
by Alex Olivas 27 Sep '15

27 Sep '15

Hey All, This was just announced this week at CppCon (originally proposed at C++Now, by Robert Ramey). There's a new program and process to allow teams, who may be maintaining boost libraries internally, to become official maintainers. These are libraries that are currently being maintained by the Boost Community Maintenance Team (https://svn.boost.org/trac/boost/wiki/CommunityMaintenance) : * Boost.ConceptCheck * Boost.DateTime * Boost.DisjointSet * Boost.DynamicBitset * Boost.Format * Boost.Function * Boost.Logic * Boost.MPL * Boost.PropertyMap * Boost.Signals (which is deprecated) * Boost.Tokenizer More information about the program can be found here: http://beta.boost.org/community/official_library_maintainer_program.html If you're interested in becoming a Boost Library Official Maintiner, please send me an email. Thanks, Alex.

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[Boost-announce] Compile and run Boost examples online
by Antony Polukhin 25 Sep '15

25 Sep '15

Hi all, I've just launched the beta version of online examples for the "Boost Application Development Cookbook": http://apolukhin.github.io/Boost-Cookbook-4880OS/ There you can do online compilation of Boost related code, run examples, freely experiment with code from the book, read intros for the code and play around with the Boost libraries. I hope the site would be useful! P.S.: If you wish to report an error or wish to have some functionality added to the site, use the "Issues" link at https://github.com/apolukhin/Boost-Cookbook-4880OS or even make a pull request. P.P.S.: Intros for Chapters 7-12 are missing at this moment. I'll add them in a few months, sorry for the delay. -- Best regards, Antony Polukhin

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switch_
by MM 25 Sep '15

25 Sep '15

I see Boost.Switch_ was provisionally accepted back inJan 2008. I see some doc here: http://dancinghacker.com/switch But I can't see it released in recent boost versions I need to select a type to dynamic_cast to based on a runtime index, so I would have the type in a mpl::vector, and use the switch_ to pick up the right type? I have under 20 types. in pseudo c++11: void f(std::size_t i, const T* obj) { typedef mpl::vector<T0, .... Tn> alltypes_t; const auto* drvobj = dynamic_cast<...>(obj); /// what do I set as arg of dynamic_cast } If switch_ can help, where do I get the code for it? Rds,

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spirit help: segfault
by Littlefield, Tyler 25 Sep '15

25 Sep '15

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello all: I'm getting a segfault when I run this. It looks like the debug prints, but when I debug it I just get an endless loop of backtrace. If anyone can help point me in the right direction, I'd appreciate it. I'd also appreciate, if possible any tips/tricks for cleaning up this grammar. Thanks! //code here: /*** *I-EBNF parser * *This defines a grammar for BNF. */ //Speeds up compilation times. //This is a relatively small grammar, this is useful. #define BOOST_SPIRIT_NO_PREDEFINED_TERMINALS #define BOOST_SPIRIT_QI_DEBUG #include <boost/config/warning_disable.hpp> #include <boost/spirit/include/qi.hpp> #include <boost/spirit/include/phoenix_operator.hpp> #include <boost/fusion/adapted.hpp> #include <boost/fusion/support.hpp> #include <vector> #include <string> #include <iostream> namespace Parser { namespace qi = boost::spirit::qi; namespace ascii = boost::spirit::ascii; enum class RHSType { Terminal, Identifier }; struct RHS { RHSType type; std::string value; }; struct Rule { std::string identifier; //lhs std::vector<RHS> rhs; }; } //expose our structs to fusion: BOOST_FUSION_ADAPT_STRUCT( Parser::RHS, (Parser::RHSType, type) (std::string, value) ) BOOST_FUSION_ADAPT_STRUCT( Parser::Rule, (std::string, identifier) (std::vector<Parser::RHS>, rhs) ) namespace Parser { typedef std::vector<Rule> RuleList; //our grammar definition template <typename Iterator> struct Grammar: qi::grammar<Iterator, std::list<Rule>, ascii::space_type> { Grammar(): Grammar::base_type(rules) { qi::char_type char_; letter = char_("a-zA-Z"); digit = char_('0', '9'); symbol = char_('[') | ']' | '[' | ']' | '(' | ')' | '<' | '>' | '\'' | '\"' | '=' | '|' | '.' | ',' | ';'; character = letter | digit | symbol | '_'; identifier = letter >> *(letter | digit | '_'); terminal = (char_('\'') >> character >> *character >> char_('\'')) | (char_('\"') >> character >> *character >> char_('\"')); lhs = identifier; rhs = terminal | identifier | char_('[') >> rhs >> char_(']') | char_('{') >> rhs >> char_('}') | char_('(') >> rhs >> char_(')') | rhs >> char_('|') >> rhs | rhs >> char_(',') >> rhs; rule = identifier >> char_('=') >> rhs; rules = rule >> *rule; } private: qi::rule<Iterator, char(), ascii::space_type> letter, digit, symbol, character; qi::rule<Iterator, std::string(), ascii::space_type> identifier, lhs, terminal; qi::rule<Iterator, RHS, ascii::space_type> rhs; qi::rule<Iterator, Rule, ascii::space_type> rule; qi::rule<Iterator, std::list<Rule>, ascii::space_type> rules; }; } int main() { Parser::Grammar<std::string::const_iterator> parser; boost::spirit::ascii::space_type space; std::string input; std::vector<std::string> output; bool result; while (std::getline(std::cin, input)) { if (input.empty()) { break; } std::string::const_iterator it, itEnd; it = input.begin(); itEnd = input.end(); result = phrase_parse(it, itEnd, parser, space, output); if (result && it == itEnd) { std::cout << "success" << std::endl; } } return 0; } - -- Take care, Ty twitter: @sorressean web:http://tysdomain.com pubkey: http://tysdomain.com/files/pubkey.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBAgAGBQJWBJSYAAoJEAdP60+BYxejpMwH/0EeVKIALYQOdl9esFIe9fIX JSor6vD/xn3e+L93TcsfpCSgtJiITfGgCPIURVX4FAE1Tf7PZSsd5lvQS6MgjyhQ q1EjDaAZNVt+cQhAftCoGcOPElx2aJXhNy/aTzcQqW1ui72t780GrF+MCo3tdq8p 5wIePhVbk0Gq8f3WBVGRXsKLi0hzwAPNXdHndNdYklNndKvClfHN8cwAZa5rFbMN b9eULQNtw42oT9tABAtpTfCl+tvExL3DMftXoALP5wONSv3ewjX8vNVWb5iv0XeZ yaYxLlnAGF314NgXOZKrtnXumDofnIzMDCZKxYFH+UfZfA7eFobGKOF3t/pN1JQ= =gD3u -----END PGP SIGNATURE-----

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slow gunzip
by Andy C 24 Sep '15

24 Sep '15

Hi, I am trying to write a simple program which processes large gziped files as streams. However, it turns out, that for some reason reading is very slow and it takes almost 10 times more to even count single lines as compared to a Java equivalent or "gunzip -c largefile.gz | wc -l". I would like to ask experts to point out what assumption I make. The source is attached below. Thanks in advance, Andy #include <iostream> #include <fstream> #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/filter/gzip.hpp> int main(int argc, char** argv) { char buf[10*4096]; std::cout << argv[1] << '\n'; long c=0; std::ifstream file(argv[1], std::ios_base::in | std::ios_base::binary); file.rdbuf()->pubsetbuf(buf, 10*4096); try { boost::iostreams::filtering_istream in; in.push(boost::iostreams::gzip_decompressor()); in.push(file); for(std::string str; std::getline(in, str); ) c++; } catch(const boost::iostreams::gzip_error& e) { std::cout << e.what() << '\n'; } std::cout << c << '\n'; return 0; }

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any_cast and added low-level const -> throws
by nice sw123 23 Sep '15

23 Sep '15

Hi, can anyone explain why an any_cast that adds a low-level const throws?? Example: char str[] = "a2"; boost::any ay(str); boost::any_cast<const char*>(ay); // throws, since a const is added!!! The only way to do this (without throwing), seems to be: boost::any_cast<char*>(ay); But why this mild "design deficiency"?? I call it "design deficiency", since the following is legal and works: char str2[] = "str2"; static_cast<const char *>(str2); So we should be able to add a low-level const, to make something read-only, right. Thanks for comments and explanations. n. Here's some test-code: /////// #include <iostream> #include <algorithm> #include <boost/any.hpp> int main() { char str[] = "a1"; boost::any ay(str); std::cout << "1 -- " << boost::any_cast<char *>(ay) << std::endl; strcpy(str, "a2"); /* throws!! */ //std::cout << "2 -- " << boost::any_cast<const char*>(ay) << std::endl; strcpy(str, "a3"); std::cout << "3 -- " << *boost::any_cast<char *>(&ay) << std::endl; strcpy(str, "a4"); /* segfault!! */ //std::cout << "4 -- " << *boost::any_cast<const char *>(&ay) << std::endl; char str2[] = "str2"; std::cout << "str2 -- " << static_cast<const char *>(str2) << std::endl; return 0; } ///////

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Boost.Locale on Windows not building with runtime-link=static
by Thomas Ziegenhagen 23 Sep '15

23 Sep '15

Hello there, once every year or so I have to rebuilt boost for the current compiler/settings combination I work with. This time it's the following: Visual Studio 2015 32 and 64bit static linking statically linked runtime I built boost from within the VS2015 developer console using this command line: c:\projects\boost_1_59_0>.\b2 variant=debug,release link=static runtime-link=static address-model=32 --stagedir=stage32 -sICU_PATH=C:\projects\icu Works great. Except that Boost.Locale does not respect the "runtime-link=static" and builds for dynamically linked runtime instead. The build log looks like this: ...patience... ...found 19297 targets... ...updating 76 targets... common.mkdir stage32 common.mkdir stage32\lib common.copy stage32\lib\libboost_atomic-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_system-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_chrono-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_container-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_thread-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_context-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_coroutine-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_date_time-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_exception-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_filesystem-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_regex-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_graph-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_iostreams-vc140-mt-sgd-1_59.lib common.copy stage32\lib\libboost_system-vc140-mt-gd-1_59.lib common.copy stage32\lib\libboost_chrono-vc140-mt-gd-1_59.lib common.copy stage32\lib\libboost_thread-vc140-mt-gd-1_59.lib common.copy stage32\lib\libboost_locale-vc140-mt-gd-1_59.lib common.copy stage32\lib\libboost_log-vc140-mt-sgd-1_59.lib Shortened. Please note the build process working correctly up until iostreams - all libraries have a 's' in the filename, denoting the statically linked runtime. Then comes Boost.Locale. And Boost.Locale does not respect the static runtime linking and instead builds for DLL runtime. The build process therefore builds all dependencies (system, chrono, thread) again with dynamic runtime linking and then builds Boost.Locale. When I'm trying to use this setup in my game, the boost auto-linking mechanism correctly determines that Boost.Locale is required, but requires the static runtime linked version, which obviously doesn't exist. So this is a bug in the build files? Is there a simple quickfix I can apply to my local installation to be able to carry on? Should I open an issue in Trac? Thanks for your time. Bye, Thomas

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