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[Graph] Problems with in-edges for a user defined AdjacencyList
by Berit Løfstedt 31 Jul '10

31 Jul '10

Hi, I am fairly new to boost and I have a problem using the in_edges(v, G) function. I have defined a graph of type AdjacencyList: typedef adjacency_list< vecS, vecS, directedS, VertexProperties, EdgeProperties > mcf_graph; The following code with m_current_network being a private class variable of type mcf_graph void best_insertion::search() { vertex_descriptor v,u,w; edge_descriptor e; graph_traits<mcf_graph>::in_edge_iterator in_e, in_end; graph_traits<mcf_graph>::out_edge_iterator out_e, out_end; edge_index_map_t edge_indices=get ( edge_index, m_current_network ); edge_type_map_t edge_types= get(edge_type, m_current_network); capacity_map_t edge_capacities=get ( edge_capacity, m_current_network ); vector<int> indices; vector<int>::iterator it, it_end; //select vertex v to reinsert //find_edge_indices of vertex v for ( tie ( in_e, in_end ) = in_edges(v, m_current_network ); in_e != in_end; in_e++ ) { e=*in_e; indices.push_back ( edge_indices[e] ); } for ( tie ( out_e, out_end ) = out_edges( v, m_current_network ); out_e != out_end; out_e++ ) { e=*out_e; indices.push_back ( edge_indices[e] ); } produces the error: error: no matching function for call to 'in_edges(vertex_descriptor&, mcf_graph&)' The problem does not occur for out_edges. From the examples I have seen AdjacencyList should support both functions. Can anybody explain to me why in_edges do not work for this example? -- Best Regards, Berit Løfstedt PhD. Student DTU Management Engineering, Operations Research Technical University of Denmark Department of Management Engineering Produktionstorvet, Bygning 426 2800 Kgs. Lyngby blof(a)man.dtu.dk <mailto:blof@man.dtu.dk> www.or.man.dtu.dk <http://www.or.man.dtu.dk>

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How often is boost::interprocess::message_queue::receive signaled?
by Andre Kirchner 31 Jul '10

31 Jul '10

Hi all, How often is method boost::interprocess::message_queue::receive signaled assuming there is data in the queue? Is it just at the end/beginning of a time-slice? I have been debugging a piece of code that is showing that receive is signaled at intervals of 15, 30 or 45 ms, and 15 ms is the duration of the time-slice of the of Windows OS when running on a multicore machine. Is there a way to increase the priority of the thread that is blocked at a receive method in a way that it would be executed right after it's signaled? Or if not possible, what other mechanism could be used? Thanks, Andre

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[Asio] Dispatch question
by Malinka Rellikwodahs 31 Jul '10

31 Jul '10

Hello List, Attached is a piece of sample code in which I'm trying to use Boost.Asio to dispatch a call that will cause the program to shutdown, however for some reason the io_service is not ever calling the handle_stop method, so the program does not shutdown. Any help would be greatly appreciated.

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std::fill with boost::numeric::ublas::triangular_matrix
by Max S. Kaznady 31 Jul '10

31 Jul '10

I am trying to figure out a way of doing the following (initialize a lower-triangular matrix P with 0's and fill the last row with 1's) using iterators: int n = 10; boost::numeric::ublas::triangular_matrix<double, lower>P(n, n); P = boost::numeric::ublas::zero_matrix<double>(n,n); for (unsigned col = 0; col < n; ++col) P(n, col) = 1.0; I want to try and use std::fill, so something like std::fill(P.begin1(), P.end() - (adjust pointer to not include the last row), 0.0); std::fill(P.begin2(), P.end2(), 1.0); I can't seem to find any examples though on how to use iterators for Boost lower triangular matrices. I know how to do this using STL vector, that's easy, but I'm not sure how to adjust the iterator pointer in this case. Thanks in advance for your help. Cheers, Max

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A doubt in Boost multi index
by Gokulakannan Somasundaram 30 Jul '10

30 Jul '10

Hi, In boost multi-index, can i verify whether a particular index type is ordered/not or not through meta programming? There are the ordered indexes, hash indexes, sequence indexes etc. Can i find them out through meta programming? Thanks, Gokul.

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Surprised by size of static libraries
by David Aldrich 30 Jul '10

30 Jul '10

Hi I have built static and shared boost_python libraries under Visual C++ 2008 under Windows and am surprised by the size difference. The commands I use are: C:\boost_1_43_0>bjam toolset=msvc-9.0 --with-python link=shared C:\boost_1_43_0>bjam toolset=msvc-9.0 --with-python link=static The resulting shared libraries are: boost_python-vc90-mt-1_43.dll 216KB boost_python-vc90-mt-gd-1_43.dll 500KB The resulting static libraries are: libboost_python-vc90-mt-1_43.lib 5.59MB libboost_python-vc90-mt-gd-1_43.lib 21.2MB Please can anyone explain why the static libraries are at least 25x larger than the shared libraries? Is there a way to reduce the size of the static libraries? Best regards David

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boost I need to do some C++ programming exercises
by Jack Bryan 30 Jul '10

30 Jul '10

Dear All, I need to do some C++ programming exercises. Would you please recommend some good books or websites with C++ programming exercises and solutions ? Any help is really appreciated. Thanks Jack July 29 2010

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Delay loading boost_python dll in Visual C++
by David Aldrich 30 Jul '10

30 Jul '10

Hi I wish to 'delay loading' the boost_python dll in my application, built with Microsoft Visual C++ 2008, running on Windows XP. The purpose is so that I can specify at runtime the directory in which the boost_python is stored using SettDllDirectory() (I wish to store the dll in a non-standard location). I am building in debug mode so I simply set project option Linker>Input>Delay Loaded DLLs equal to boost_python-vc90-mt-gd-1_43.dll. When I run the code I get an exception in Microsoft file delayhlp.cpp at line 331: return dli.pfnCur; No boost_python API has been called until that point by my code, but the stack frame shows that boost method: registry_lookup1(type<T>) { return registry_lookup2((T(*)())0); } has been called, and resulted in the exception. Does this simply mean that boost_python is not suited to delay loading? (Note: it has been suggested that I use a manifest file to reference the dll, but that does not work as one cannot specify arbitrary assembly locations under Windows XP). With best regards David

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test: tutorials/new-year-resolution.html typo
by Hicham Mouline 30 Jul '10

30 Jul '10

Hello BOOST_AUTO_EST_CASE should be BOOST_AUTO_TEST_CASE

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How to get the basic_path specialization for TCHAR ?
by Timothy Madden 30 Jul '10

30 Jul '10

Hello Is there a nice why to select a basic_path specialization with the current with of TCHAR ? I mean like a string or wstring can be selected with basic_string<TCHAR>, I would like to select path or wpath with something like basic_path<basic_string<TCHAR>> or basic_path<basic_string<TCHAR>, path_traits<TCHAR>>, except that there is no template path_traits<>. Is there a sort sort of a type selector template in boost that receives TCHAR as and index and based on its width returns on of the other type arguments ? Thank you, Timothy Madden

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