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[mpl] no result_type defined
by Frank Birbacher 27 Apr '06

27 Apr '06

Hi! I want to create a container of pointers to objects in a range (first,last(. I tried to use mpl, but have been without success. I understand, that the lambda "&_1" cannot specify its concrete return type, so I added ret<T>(...). But the resulting lambda is rejected by the make_transform_iterator function. I'm using boost 1.33.0 on gcc 4.0.2 //****** CODE BEGIN ****** #include <vector> #include <iterator> #include <boost/iterator/transform_iterator.hpp> #include <boost/lambda/lambda.hpp> template<typename Iterator> void foo(Iterator first, Iterator last) { using boost::make_transform_iterator; using namespace boost::lambda; typedef typename std::iterator_traits<Iterator>::pointer Pointer; std::vector<Pointer> objectPointers( make_transform_iterator(first, ret<Pointer>(&_1)), make_transform_iterator(last, ret<Pointer>(&_1)) ); // ... } int main() { std::vector<int> v; //instantiate template: foo(v.begin(), v.end()); } //***** CODE END ****** // ** ERROR on GCC 4.0.2: ** /mnt/daten/develop/boost/boost/iterator/transform_iterator.hpp:43: Fehler: kein Typ namens »result_type« in »class boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::explicit_return_type_action<int*>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::other_action<boost::lambda::addressof_action>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >« The error says it cannot find the type "result_type" in "class ....". What is wrong here? Frank

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[BGL] How to build graphviz with MS VC8?
by Rui Carvalho 27 Apr '06

27 Apr '06

Hi, I'm trying to build graphviz so as to be able to use read_graphviz in the boost graph library. My understanding is that the make file in Boost 1_33_1\boost_1_33_1\libs\graph\src is not yet ready for VC -but I may be missing something obvious here. Is there a simple way to compile the graphviz library with VC? Thanks, Rui

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Boost::program_options - Linking Issue
by Adam Hartshorne 27 Apr '06

27 Apr '06

Using the following command lines on a linux box, g++ -c -pipe -Wall -W -O2 -pipe -m64 -fexceptions -D_REENTRANT -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -I/usr/lib64/qt-3.3/mkspecs/default -I. -Idcs/improc2/adam/boost_1_33_1/ -I/usr/lib64/qt-3.3/include -I.moc/ -o .obj/first.o first.cpp g++ -o cmdLineTest .obj/first.o -L/usr/lib64/qt-3.3/lib -L/usr/X11R6/lib64 -L/dcs/improc2/adam/boost_1_33_1/stage/lib/ -lboost_program_options-gcc -lqt-mt -lXext -lX11 -lm -lpthread I get the following error output when trying to compile the first.cpp example provided with the library .obj/first.o(.text+0x57): In function `main': : undefined reference to `boost::program_options::options_description::options_description(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' .obj/first.o(.gnu.linkonce.t._ZNK5boost15program_options25basic_command_line_parserIcE3runEv+0x5): In function `boost::program_options::basic_command_line_parser<char>::run() const': : undefined reference to `boost::program_options::common_command_line_parser::run() const' .obj/first.o(.gnu.linkonce.t._ZN5boost15program_options25basic_command_line_parserIcEC1EiPPc+0x42): In function `boost::program_options::basic_command_line_parser<char>::basic_command_line_parser(int, char**)': : undefined reference to `boost::program_options::common_command_line_parser::common_command_line_parser(std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&)' And help would be greatly appreciated, Adam

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[1.33.1][mpl] increasing BOOST_MPL_LIMIT_LIST_SIZE doesn't work
by Marc Mutz 27 Apr '06

27 Apr '06

Hi, According to the mpl docs, defining above macro to e.g. 30 should make boost::mpl::list<> take 30 template arguments, and thus enable boost::variant<> to hold 21 different types (default: 20 on my platform (gcc 4.0)). Yet compiling the attached sample program gives me attached error message, which indicates that mpl::list<> still takes only 20 template parameters. Bug? Thanks, Marc -- Marc Mutz -- marc(a)klaralvdalens-datakonsult.se, mutz(a)kde.org Klarälvdalens Datakonsult AB, Platform-independent software solutions

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I/O bug in date_time
by Thomas Lemaire 27 Apr '06

27 Apr '06

Dear list, I encounter a bug while reading a time_duration object, here is a short test case, the results are obtained with boost 1.33.1, gcc4.0.3 using namespace boost::posix_time; time_duration td1(0,0,0); std::stringstream ss1("14:23:11.345678"); ss1 >> td1; std::cout << td1 << std::endl; // 14:23:11.345678 time_duration td2(0,0,0); std::stringstream ss2("18353:23:11.345678"); ss2 >> td2; std::cout << td2 << std::endl; // 18:53:23 time_duration td3(0,0,0); std::stringstream ss3("318353:23:11.345678"); ss3 >> td3; std::cout << td3 << std::endl; // 00:00:00 If I compile with the flag CPPFLAGS += -DUSE_DATE_TIME_PRE_1_33_FACET_IO this is working well. I hope this will help to fix it... -- thomas http://www.laas.fr/~tlemaire

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any and Map
by Joe McCay 27 Apr '06

27 Apr '06

if dt=3.5; is a double, then would dt=3.5F; be a float? and dt=3.5L; would be a long double? I had forgotten about those. People don't talk & wrtie about thosse much. Would something similar happen with int & long? Joe McCay

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bcbboost 0.4 released
by Nicola Musatti 27 Apr '06

27 Apr '06

Hallo, I just released version 0.4 of bcbboost, a set of patches that enable use of the Boost 1.33.1 libraries with Borland's BCB2006. This release is the first to support the bcc32 5.8.2 compiler, which comes with Update2. You can download it from here: http://prdownloads.sourceforge.net/bcbboost/bcbboost-1_33_1-5_8_2-0.4.zip?d… Please post any bug report, suggestion, request for clarification to the project trackers on its SourceForge site: http://sourceforge.net/projects/bcbboost/ Cheers, Nicola Musatti

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debugging link errors
by Dave Compton 27 Apr '06

27 Apr '06

Is there a way to get bjam to display the actual compile/link commands that it uses to build the boost libraries as it builds them? I'm seeing some link failures and it would make it easier to figure out what is going on if I could see the link command. Thanks. - Dave

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any and Map.
by Joe McCay 27 Apr '06

27 Apr '06

I keep getting a bad_any_cast exception when I retrieve data from a map. Basically: class DataType { //protected: public: boost::any value_; DataType(){}; template <class type> DataType(type& value) : value_(value) {}; template <class type> DataType(const type& value) : value_(value) {}; // Provide constant & non constant version of operator = template <class type> type& operator=(type &rhs) { value_=rhs; return rhs; }; template <typename type> const type& operator= (const type& rhs) { value_=rhs; return rhs; }; } map <std::string, DataType> m; DataType dt; dt=3.5; m["Data 1"] = dt; DataType dt = fieldData["Data 1"]; fValue = boost::any_cast<float>(dt.value_); //returns a bad_any_cast What am I doing wrong? Joe McCay

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[program_options] making options mandatory
by Luke Elliott 26 Apr '06

26 Apr '06

Hi Is it possible to make options mandatory in program_options? I see some references to such functionality in various review emails, but I can't find anything in the docs themselves. Somewhat related: I actually want the mandatory options to be positional options. I there's an exception class too_few_positional_options_error but it doesn't appear to be used at all (too_many_positional_options_error is). The solution I have at the moment is to have a separate options_description for mandatory options and then to check for count() != 0 for those options after parsing... Thanks in advance Luke Elliott.

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