September 2007 - Boost-users

boost::timer elapsed_max() is too small
by Peng Yu 03 Sep '07

03 Sep '07

Hi, I want to use boost timer to measure my program runtime. Unfortunately, the maximum elapsed time that it can give is only about two thousand seconds. I'm wondering if there is any way to increase this limit? Thanks, Peng $ cat main.cc #include <boost/timer.hpp> #include <iostream> int main() { boost::timer this_timer; std::cout << this_timer.elapsed_max() << " sec" << std::endl; } $ ./main-g.exe 2147.48 sec

1 0

boost::any typeid and different modules
by Gernot Vormayr 02 Sep '07

02 Sep '07

Hi! I have some problems using boost::any in different modules that get loaded with libdl. If i store an int in the boost::any it works like a charm - but when i use a std::string then the boost::any (holding a std::string) isn't any_castable to a std::string because it seems that typeid(std::string) != boost::any.type(). Only thing which is the same is the string represantation of type().name(). I came around this with my own any_cast implementation: template<typename ValueType> ValueType * any_cast(any * operand) { return operand && (operand->type() == typeid(ValueType) || std::string(operand->type().name()).compare(typeid(ValueType).name())==0) ? &static_cast<any::holder<ValueType> *>(operand->content)->held : 0; } Is there a better way to address this issue? Best regards, Gernot Vormayr

2 2

[multi_array] Warnings on upgrade to 1.34.1
by Mark Ruzon 01 Sep '07

01 Sep '07

This reindex function in multi_array/view.hpp is apparently being compiled with BOOST_NO_SFINAE not being defined. template <class BaseList> #ifdef BOOST_NO_SFINAE void #else typename disable_if<typename boost::is_integral<BaseList>::type,void >::type #endif reindex(const BaseList& values) { boost::function_requires< detail::multi_array::CollectionConcept<BaseList> >(); boost::detail::multi_array:: copy_n(values.begin(),num_dimensions(),index_base_list_.begin()); origin_offset_ = this->calculate_indexing_offset(stride_list_,index_base_list_); } I am getting the following error, because naturally there is no return statement. /usr/include/c++/boost_1_34_1/boost/multi_array/view.hpp: In member function `boost::disable_if<boost::is_integral<BaseList>::type, void>::type boost::detail::multi_array::const_multi_array_view<T, NumDims, TPtr>::reindex(const BaseList&)': /usr/include/c++/boost_1_34_1/boost/multi_array/view.hpp:89: warning: no return statement in function returning non-void Is there a fix for this? Shouldn't there be another #ifdef with a return statement? How do I know if I should define BOOST_NO_SFINAE? Sincerely, Mark Ruzon

3 4

subgraph and bundled properties
by Sam Peterson 01 Sep '07

01 Sep '07

According to the release notes of version 1.33, bundled properties are now supposed to work with the subgraph adapter. I am currently using 1.34 However, I'm receiving a compiler error that I never was before I tried to switch to the subgraph adapter: graph.cpp:569: instantiated from here boost_1_34_1/boost/graph/properties.hpp:355: error: no type named 'vertex_bundled' in 'class boost::subgraph<boos\ t::adjacency_list<boost::setS, boost::vecS, boost::bidirectionalS, Paper, boost::property<boost::edge_index_t, lo\ ng unsigned int, boost::no_property>, boost::no_property, boost::listS> >' The line in question looks like this: put(&Paper::authors, *g, index_map.index_map[atoi(current_paper_id->c_str())], name_index); My bundled properties and graph typdefs look like this: struct Paper { unsigned int paper_id; std::string title; std::vector<std::size_t> authors; std::string subject; std::string description; std::string publisher; std::string date_of_paper; std::string format; std::string identifier; std::string source; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & paper_id; ar & title; ar & authors; ar & subject; ar & description; ar & publisher; ar & date_of_paper; ar & format; ar & identifier; ar & source; } }; typedef boost::adjacency_list_traits<boost::setS, boost::vecS, boost::undirectedS> Traits; typedef boost::adjacency_list< boost::setS, // OutEdgeList container boost::vecS, // Vertex container boost::bidirectionalS, // Directed status Paper, // Vertex bundled properties boost::property<boost::edge_index_t, std::size_t> > PaperGraph_t; typedef boost::subgraph < PaperGraph_t > PaperGraph; typedef boost::graph_traits<PaperGraph>::vertex_descriptor PaperVertex; typedef boost::graph_traits<PaperGraph>::edge_descriptor PaperEdge; Is there anything I'm doing wrong or is this a bug? -- Sam Peterson peabody(a)freeshell.org peabodyenator(a)gmail.com

1 0