June 2008 - Boost-users - lists.preview.boost.org

Boost.Test: missing include file
by Jarl Friis 02 Jun '08

02 Jun '08

I am using BOOST_CHECK_CLOSE which is defined in test_tools.hpp. I my test I have #include <boost/test/unit_test.hpp> Aparently this requires that I also include #include <boost/test/floating_point_comparison.hpp> wouldn't it be more correct to have this include in the test_tools.hpp file? Jarl

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Test tree is empty
by Stephen Torri 02 Jun '08

02 Jun '08

I am sure this is a silly common answer but I am not sure how to resolve it. Here is my test suite below. I am following http://www.hpfsc.de/boosttest/ as my guide. #define BOOST_TEST_DYN_LINK #define BOOST_TEST_MODULE Statistical algorithm test suite #include <boost/test/unit_test.hpp> #include "Statistical_Test.h" using boost::unit_test_framework::test_suite; using boost::unit_test_framework::test_case; using namespace libreverse::classifier; class statistical_test_suite : public test_suite { public: statistical_test_suite () : test_suite ( "statistical_test_suite" ) { // create an instance of the test cases class boost::shared_ptr<Statistical_Test> instance ( new Statistical_Test() ); test_case* test_Constructor_test_case = BOOST_CLASS_TEST_CASE( &Statistical_Test::test_Constructor, instance ); add ( test_Constructor_test_case ); } }; test_suite* init_unit_test_suite ( int, char** ) { test_suite* top_test_suite = BOOST_TEST_SUITE("Statistical algorithm test suite"); // add test suites to the top test suite top_test_suite->add ( new statistical_test_suite() ); return top_test_suite; }

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variant<> number of template arguments
by Hicham Mouline 01 Jun '08

01 Jun '08

Hello, I have a use of the visitor pattern (this was an answer provided to me on c++-moderated) as shown below. Question1: is the maximum number of variant<> arguments extendable? Question2: Below, some of the variants I have are full template specs. Is there a way to write the variant<> typedef with templates instead and have the operator() of the static visitor a template member. Rds, --------------- #include <iostream> #include <boost/variant.hpp> struct derived1 {}; struct derived2 {}; struct derived3 {}; typedef boost::variant<derived1, derived2, derived3> base; // function object struct operation : boost::static_visitor<int> { int operator()(const derived1&) const { return 1; } int operator()(const derived2&) const { return 2; } int operator()(const derived3&) const { return 3; } }; int main() { base a = derived1(); operation op; std::cout << a.apply_visitor(op) << std::endl; // prints "1" base a = derived2(); std::cout << a.apply_visitor(op) << std::endl; // prints "2" }

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Having trouble using lapack bindings with boost
by Omar Alvi 01 Jun '08

01 Jun '08

Hello People, I am new to boost and I am trying to use use lapack bindings with boost as I need to use svd and some other advanced operations to solve linear systems. I have downloaded boost-bindings-20080501 from http://mathema.tician.de/dl/software/boost-bindings but cant figure out how to compile it on windows using VC8. Could someone please tell me how I can do that ? I saw somewhere that people have compiled it on linux using ./configure, make and make install but I want to compile it on windows. Thanks, Omar

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Neighborhood of a subgraph
by Imran A. Pirwani 01 Jun '08

01 Jun '08

Hi, I am new to BGL and wanted to find out if there's an easy way to do the following in BoostGL: Given a subset of vertices (specified as a parameter to the function), a graph g, how does one query the neighbors of the subset that are not in the subset? Is there a function already written that I can use or an easy way to implement the above using simple building-blocks? I could maybe write my own...but I need to be making this query many many times for different subgraphs and I'd prefer to not have to check the membership within the subset many times over and over again. Any ideas will be greatly appreciated! Thanks! -Imran.

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Trouble building statecharts with gcc 4.3.0
by Abhinandan Jain 01 Jun '08

01 Jun '08

Hi I am having trouble compiling boost statechart code using gcc 4.3.0. I tried this on the +sample program on statechart site and get the same errors. The errors are of the type error: value-initialization of reference for each process_event call in the example: myWatch.process_event( EvStartStop() ); myWatch.process_event( EvStartStop() ); myWatch.process_event( EvStartStop() ); Does anyone have a suggestion on how to fix this? Thanks Abhi

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How to open a file with its associated application?
by Zdravko Monov 01 Jun '08

01 Jun '08

Hi! Is there a C++ library that can, given a filename, start the default application for its type to open it? -- Zdravko Monov

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