June 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

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[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.

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[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

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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 >> > >

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the stability of breadth_first_visit in BGL
by breadbread1984 14 Jul '15

14 Jul '15

I am wondering if breadth_first_visit can always get the same sequence of vertex no matter whether the graph is serialized and deserialized again. Thx

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Subgraph at distance n
by Rossano Schifanella 14 Jul '15

14 Jul '15

Hi all, which is the easiest way to extract from a graph G and a generic node source a subgraph with all the vertices/edges at distance at most n from source? Thanks a lot for your help. Best, Rossano

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Problems to use Boost Graph
by Oodini 04 Jul '15

04 Jul '15

Hello, I am trying to understand the boost::dijkstra_shortest_paths() function. I don't understand the second and third arguments. The documentation says they're supposed to be properties map : OUT: predecessor_map(PredecessorMap p_map) The predecessor map records the edges in the shortest path tree, the tree computed by the traversal of the graph. Upon completion of the algorithm, the edges (p[u],u) for all u in V are in the tree. The shortest path from vertex s to each vertex v in the graph consists of the vertices v, p[v], p[p[v]], and so on until s is reached, in reverse order. The tree is not guaranteed to be a minimum spanning tree. If p[u] = u then u is either the source vertex or a vertex that is not reachable from the source. The PredecessorMap type must be a Read/Write Property Map whose key and value types are the same as the vertex descriptor type of the graph. but that doesn't work. I have to use an iterator on the properties map, by using : boost::make_iterator_property_map(pred_map.begin(),vertex_index) Does the documentation need reviewers ?

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Boost 1.58 and Intel Compiler 15
by Matthieu Brucher 02 Jul '15

02 Jul '15

Hi, Has any one worked with the latest Intel compiler on Linux? I'm hit with some Spirit/Fusion issues that don't arise with gcc 4.8.2 or clang 3.6.0. Quite difficult to diminish the number of lines in my example case, as the errors are different between in project and out of project... Cheers, Matthieu -- Information System Engineer, Ph.D. Blog: http://matt.eifelle.com LinkedIn: http://www.linkedin.com/in/matthieubrucher Music band: http://liliejay.com/

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Re: [Boost-users] Boost-users Digest, Vol 4181, Issue 1
by Carl Wallace 01 Jul '15

01 Jul '15

> >Message: 7 >Date: Tue, 30 Jun 2015 11:08:50 +0900 >From: Kohei Takahashi <flast(a)flast.jp> >To: boost-users(a)lists.boost.org >Subject: Re: [Boost-users] fusion error when compiling graphviz code > using VC2010 >Message-ID: <5591FA32.6070802(a)flast.jp> >Content-Type: text/plain; charset="utf-8" > >Hi Carl, > >On 2015/06/29 20:36, Carl Wallace wrote: >> We have been using Boost's graphviz support for several years and have >> upgraded through a few versions of Boost with no issues in some long >> stable code. However, when we moved to 1.58 our Windows build broke. We >> are still using VC2010, with plans to move to 2015 in the >>not-too-distant >> future. We have not yet tried 1.58 in VC2015. The error message is very >> large but emanates from here: >Can I get (minimal) reproducible code or more detailed error log? > >Best, >Kihei This stripped down code snip is enough to trigger the error when the 1.58 code is in place and compiles fine when the code from 1.54 is substituted in the place I indicating initially. This code is not intended to do anything and I have not run it. I can send the original error message if you like too. Will send that privately if you want it. #include <boost/graph/breadth_first_search.hpp> #include <boost/graph/visitors.hpp> #include <boost/graph/graphviz.hpp> using namespace boost; template <class Name, class ColorMap> class label_writer2 { public: label_writer2(Name _name, ColorMap _color) : name(_name), color(_color) {} template <class VertexOrEdge> void operator()(std::ostream& out, const VertexOrEdge& v) const { } private: Name name; ColorMap color; }; struct VertexProps { }; typedef adjacency_list < vecS, vecS, bidirectionalS, VertexProps> graph_t; typedef property_map<graph_t, std::string VertexProps::*>::type name_map_t; int _tmain(int argc, char* argv[]) { std::ostringstream oss; graph_t m_graph; name_map_t m_nameMap; two_bit_color_map<property_map<graph_t, vertex_index_t>::const_type>color_map(num_vertices(m_graph), get(vertex_index, m_graph)); boost::write_graphviz(oss, m_graph, label_writer2<name_map_t, two_bit_color_map<property_map<graph_t, vertex_index_t>::const_type> >(m_nameMap, color_map)); return 0; }

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Thinking in HDF5
by nitin chandra 30 Jun '15

30 Jun '15

Hello All, I have been on this for a long time and have done a lot of research / reading on this topic, HDF5. To use it for development of in-house software for design calculation of various alignments. A lot many time the basic alignment information is picked from a map / satellite imageries. Kilometre, ground level, geographic feature on the proposed route, etc. , in a csv file. Any where between 7-9 files are generated for each alignment. 1. How to read / write data into the HDF5 file ? What after creating root ? 2. In a regular situation, I have 2 input file with 3 column csv data, and 2 output files. How to do that within the same root ? Will be working in Python and c / c++. This is just the basic. If I can do this much, I can do the rest, hopefully :) Thanks to All Nitin PS :- Will post in scipy-user list too.

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