January 2006 - Boost-users - lists.preview.boost.org

program_options requires non-const argv
by Steve Byan 25 Jan '06

25 Jan '06

I'm used to declaring main() as int main (int argc, const char * argv[]) Attempting to use boost::program_options with a const char * argv[] results in the compilation errors appended below on SLES 9 with gcc 3.3.3. Similar errors are reported on Mac OS 10.4.4 with gcc 4.0.1. First, I'd consider it an enhancement if program_options were to support a const char * argv[]. Second, is program_options actually modifying argv? Note the last error: "/usr/include/g++/bits/basic_string.tcc:160: error: assignment of read-only location" Regards, -Steve /usr/bin/g++ -c -UNDEBUG -DDEBUG -Dpowerpc -Ddarwin6_0 -I/home/smb/ boston/HEAD/boston/common/iscsi/src -I/home/smb/boston/HEAD/boston/ common/iscsi/share/include -g -O0 -L/home/smb/boston/HEAD/boston/ common/iscsi/share/lib -MD -o iscsi_dvd_targetd.o iscsi_dvd_targetd.cpp iscsi_dvd_targetd.cpp: In function `int main(int, const char**)': iscsi_dvd_targetd.cpp:31: error: no matching function for call to `store( boost::program_options::basic_parsed_options<const char>, boost::program_options::variables_map&)' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/variables_map.hpp:138: error: candidates are: void boost::program_options::store(const boost::program_options::basic_parsed_options<char>&, boost::program_options::variables_map&, bool) /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/variables_map.hpp:146: error: void boost::program_options::store(const boost::program_options::basic_parsed_options<wchar_t>&, boost::program_options::variables_map&) /usr/include/g++/bits/stl_alloc.h: At global scope: /usr/include/g++/bits/stl_alloc.h: In instantiation of `std::allocator<const char>': /usr/include/g++/bits/basic_string.h:116: instantiated from `std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >' /usr/include/g++/bits/stl_vector.h:162: instantiated from `std::_Vector_base<_Tp, _Alloc>::~_Vector_base() [with _Tp = std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >, _Alloc = std::allocator<std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> > >]' /usr/include/g++/bits/stl_vector.h:229: instantiated from `std::vector<_Tp, _Alloc>::vector(typename std::_Vector_base<_Tp, _Alloc>::allocator_type&) [with _Tp = std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >, _Alloc = std::allocator<std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> > >]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:18: instantiated from `std::vector<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> >, std::allocator<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> > > > boost::program_options::detail::make_vector(Iterator, Iterator) [with charT = const char, Iterator = const char**]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:42: instantiated from `boost::program_options::basic_command_line_parser<charT>::basic_command _line_parser(int, charT**) [with charT = const char]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:118: instantiated from `boost::program_options::basic_parsed_options<charT> boost::program_options::parse_command_line(int, charT**, const boost::program_options::options_description&, int, boost::function1<std::pair<std::string, std::string>, const std::string&, std::allocator<boost::function_base> >) [with charT = const char]' iscsi_dvd_targetd.cpp:31: instantiated from here /usr/include/g++/bits/stl_alloc.h:662: error: `const _Tp* std::allocator<_Alloc>::address(const _Tp&) const [with _Tp = const char]' and `_Tp* std::allocator<_Alloc>::address(_Tp&) const [with _Tp = const char]' cannot be overloaded /usr/include/g++/bits/basic_string.tcc: In instantiation of `std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >': /usr/include/g++/bits/stl_vector.h:162: instantiated from `std::_Vector_base<_Tp, _Alloc>::~_Vector_base() [with _Tp = std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >, _Alloc = std::allocator<std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> > >]' /usr/include/g++/bits/stl_vector.h:229: instantiated from `std::vector<_Tp, _Alloc>::vector(typename std::_Vector_base<_Tp, _Alloc>::allocator_type&) [with _Tp = std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >, _Alloc = std::allocator<std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> > >]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:18: instantiated from `std::vector<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> >, std::allocator<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> > > > boost::program_options::detail::make_vector(Iterator, Iterator) [with charT = const char, Iterator = const char**]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:42: instantiated from `boost::program_options::basic_command_line_parser<charT>::basic_command _line_parser(int, charT**) [with charT = const char]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:118: instantiated from `boost::program_options::basic_parsed_options<charT> boost::program_options::parse_command_line(int, charT**, const boost::program_options::options_description&, int, boost::function1<std::pair<std::string, std::string>, const std::string&, std::allocator<boost::function_base> >) [with charT = const char]' iscsi_dvd_targetd.cpp:31: instantiated from here /usr/include/g++/bits/basic_string.h:307: error: `static void std::basic_string<_CharT, _Traits, _Alloc>::_S_copy_chars(_CharT*, __gnu_cxx::__normal_iterator<typename _Alloc::const_pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::const_pointer, std::basic_string<_CharT, _Traits, _Alloc> >) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>] ' and `static void std::basic_string<_CharT, _Traits, _Alloc>::_S_copy_chars(_CharT*, __gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>] ' cannot be overloaded /usr/include/g++/bits/basic_string.h:315: error: `static void std::basic_string<_CharT, _Traits, _Alloc>::_S_copy_chars (_CharT*, const _CharT*, const _CharT*) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' and ` static void std::basic_string<_CharT, _Traits, _Alloc>::_S_copy_chars(_CharT*, _CharT*, _CharT*) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>] ' cannot be overloaded /usr/include/g++/bits/basic_string.h:636: error: `std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::replace(__gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, const _CharT*, const _CharT*) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' and `std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::replace(__gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, _CharT*, _CharT*) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' cannot be overloaded /usr/include/g++/bits/basic_string.h:647: error: `std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::replace(__gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::const_pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::const_pointer, std::basic_string<_CharT, _Traits, _Alloc> >) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>] ' and `std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::replace(__gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::pointer, std::basic_string<_CharT, _Traits, _Alloc> >) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>] ' cannot be overloaded /usr/include/g++/bits/basic_string.h: In member function ` std::basic_string<_CharT, _Traits, _Alloc>::_Rep* std::basic_string<_CharT, _Traits, _Alloc>::_M_rep() const [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]': /usr/include/g++/bits/basic_string.h:355: instantiated from `std::basic_string<_CharT, _Traits, _Alloc>::~basic_string() [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:22: instantiated from `std::vector<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> >, std::allocator<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> > > > boost::program_options::detail::make_vector(Iterator, Iterator) [with charT = const char, Iterator = const char**]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:42: instantiated from `boost::program_options::basic_command_line_parser<charT>::basic_command _line_parser(int, charT**) [with charT = const char]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:118: instantiated from `boost::program_options::basic_parsed_options<charT> boost::program_options::parse_command_line(int, charT**, const boost::program_options::options_description&, int, boost::function1<std::pair<std::string, std::string>, const std::string&, std::allocator<boost::function_base> >) [with charT = const char]' iscsi_dvd_targetd.cpp:31: instantiated from here /usr/include/g++/bits/basic_string.h:257: error: reinterpret_cast from `const char*' to `std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >::_Rep*' casts away const (or volatile) /usr/include/g++/bits/basic_string.tcc: In member function `_CharT* std::basic_string<_CharT, _Traits, _Alloc>::_Rep::_M_clone(const _Alloc&, typename _Alloc::size_type) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]': /usr/include/g++/bits/basic_string.h:195: instantiated from `_CharT* std::basic_string<_CharT, _Traits, _Alloc>::_Rep::_M_grab (const _Alloc&, const _Alloc&) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' /usr/include/g++/bits/basic_string.tcc:195: instantiated from `std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' /usr/include/g++/bits/stl_construct.h:78: instantiated from `void std::_Construct(_T1*, const _T2&) [with _T1 = std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >, _T2 = std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >]' /usr/include/g++/bits/stl_vector.h:599: instantiated from `void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >, _Alloc = std::allocator<std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> > >]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:22: instantiated from `std::vector<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> >, std::allocator<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> > > > boost::program_options::detail::make_vector(Iterator, Iterator) [with charT = const char, Iterator = const char**]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:42: instantiated from `boost::program_options::basic_command_line_parser<charT>::basic_command _line_parser(int, charT**) [with charT = const char]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:118: instantiated from `boost::program_options::basic_parsed_options<charT> boost::program_options::parse_command_line(int, charT**, const boost::program_options::options_description&, int, boost::function1<std::pair<std::string, std::string>, const std::string&, std::allocator<boost::function_base> >) [with charT = const char]' iscsi_dvd_targetd.cpp:31: instantiated from here /usr/include/g++/bits/basic_string.tcc:596: error: assignment of read- only location /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/convert.hpp: In function `std::vector<std::string, std::allocator<std::string> > boost::program_options::to_internal(const std::vector<T, std::allocator<_CharT> >&) [with T = std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >]': /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:42: instantiated from `boost::program_options::basic_command_line_parser<charT>::basic_command _line_parser(int, charT**) [with charT = const char]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:118: instantiated from `boost::program_options::basic_parsed_options<charT> boost::program_options::parse_command_line(int, charT**, const boost::program_options::options_description&, int, boost::function1<std::pair<std::string, std::string>, const std::string&, std::allocator<boost::function_base> >) [with charT = const char]' iscsi_dvd_targetd.cpp:31: instantiated from here /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/convert.hpp:79: error: no matching function for call to `to_internal(const std::basic_string<const char, std::char_traits<const char>, std::allocator<const char> >&)' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/convert.hpp:70: error: candidates are: std::string boost::program_options::to_internal(const std::string&) /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/convert.hpp:72: error: std::string boost::program_options::to_internal(const std::wstring&) /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp: In member function `boost::program_options::basic_parsed_options<charT> boost::program_options::basic_command_line_parser<charT>::run() [with charT = const char]': /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:118: instantiated from `boost::program_options::basic_parsed_options<charT> boost::program_options::parse_command_line(int, charT**, const boost::program_options::options_description&, int, boost::function1<std::pair<std::string, std::string>, const std::string&, std::allocator<boost::function_base> >) [with charT = const char]' iscsi_dvd_targetd.cpp:31: instantiated from here /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:106: error: no matching function for call to ` boost::program_options::basic_parsed_options<const char>:: basic_parsed_options (boost::program_options::basic_parsed_options<char>&)' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:118: error: candidates are: boost::program_options::basic_parsed_options<const char>::basic_parsed_options(const boost::program_options::basic_parsed_options<const char>&) /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/parsers.hpp:35: error: boost::program_options::basic_parsed_options<charT>::basic_parsed_option s(const boost::program_options::options_description*) [with charT = const char] /usr/include/g++/bits/basic_string.tcc: In static member function `static _CharT* std::basic_string<_CharT, _Traits, _Alloc>::_S_construct (_InIter, _InIter, const _Alloc&, std::forward_iterator_tag) [with _FwdIter = const char*, _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]': /usr/include/g++/bits/basic_string.h:670: instantiated from `static _CharT* std::basic_string<_CharT, _Traits, _Alloc>::_S_construct_aux (_InIter, _InIter, const _Alloc&, __false_type) [with _InIter = const char*, _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' /usr/include/g++/bits/basic_string.h:687: instantiated from `static _CharT* std::basic_string<_CharT, _Traits, _Alloc>::_S_construct (_InIter, _InIter, const _Alloc&) [with _InIter = const char*, _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' /usr/include/g++/bits/basic_string.tcc:229: instantiated from `std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = const char, _Traits = std::char_traits<const char>, _Alloc = std::allocator<const char>]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:22: instantiated from `std::vector<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> >, std::allocator<std::basic_string<_CharT, std::char_traits<_CharT>, std::allocator<_CharT> > > > boost::program_options::detail::make_vector(Iterator, Iterator) [with charT = const char, Iterator = const char**]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:42: instantiated from `boost::program_options::basic_command_line_parser<charT>::basic_command _line_parser(int, charT**) [with charT = const char]' /home/smb/boston/HEAD/boston/common/iscsi/share/include/boost/ program_options/detail/parsers.hpp:118: instantiated from `boost::program_options::basic_parsed_options<charT> boost::program_options::parse_command_line(int, charT**, const boost::program_options::options_description&, int, boost::function1<std::pair<std::string, std::string>, const std::string&, std::allocator<boost::function_base> >) [with charT = const char]' iscsi_dvd_targetd.cpp:31: instantiated from here /usr/include/g++/bits/basic_string.tcc:160: error: assignment of read- only location make: *** [iscsi_dvd_targetd.o] Error 1 -------- Steve Byan <smb(a)egenera.com> Software Architect Egenera, Inc. 165 Forest Street Marlboro, MA 01752 (508) 858-3125

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Re: [Boost-users] shared_ptr and typedef
by Sohail Somani 25 Jan '06

25 Jan '06

> > Why is there a need? Presumably you're potential surrogate > for shared_ptr > > will also support operator *, and that's all you use in > your function. > > Why is there a need to do what? I'm not following you here. I've > gone through and specified Type everywhere in my application. It's > ugly but it works. Would the upcoming template typedef feature > avoid the need to specify Type in the call? I think what Jens is getting at is that you should use the duck-typing that C++ templating affords you: #include <boost/smart_ptr.hpp> #include <iostream> using namespace std; template<typename Handle> void print_handle(Handle p) { cout << *p << endl; } int main() { int * a = new int(5); boost::shared_ptr<int> b(new int(6)); print_handle(a);print_handle(b); } $ ./a.out 5 6

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[spirit] "parseable" foo_thing with Boost.Spirit pattern
by Pedro Lamarão 25 Jan '06

25 Jan '06

Here follows a simple pattern to use Boost.Spirit to create a "parseable" object, with a bonus formatted input operator, allowing you quick access to formatter input for your type. (Yeah, this stuff needs tweaking for better error handling, etc.) class foo_thing { public: /* Other methods and stuff. */ template <typename ForwardIterator> boost::spirit::parse_info<IteratorT> parse (ForwardIterator begin, ForwardIterator end); private: class grammar; /* Data members, etc. */ }; template <typename CharT, typename TraitsT> std::basic_istream<CharT, TraitsT>& operator>> (std::basic_istream<CharT, TraitsT>& i, foo_thing& thing) { using namespace std; using namespace boost::spirit; typedef multi_pass<istreambuf_iterator<CharT> > iterator_t; iterator_t begin(i); iterator_t end = make_multi_pass(istreambuf_iterator<CharT>()); /* What if thing.parse() throws? */ parse_info<iterator_t> info = thing.parse(begin, end); if (!info.hit) i.setstate(ios_base::failbit); return i; } class foo_thing::grammar : public boost::spirit::grammar<foo_thing::grammar> { public: grammar (foo_thing& thing) : _M_thing(thing) {} template <typename ScannerT> class definition; private: foo_thing mutable& _M_thing; }; template <typename ScannerT> class foo_thing::grammar::definition { public: /* Define this one; your parser ultimately writes to self._M_thing. */ definition (foo_thing::grammar const& self); boost::spirit::rule<ScannerT> const& start () const; private: /* Populate with rules. */ }; template <typename IteratorT> boost::spirit::parse_info<IteratorT> foo_thing::parse (IteratorT begin, IteratorT end) { namespace s = boost::spirit; grammar g(*this); s::parse_info<IteratorT> r = s::parse(begin, end, g); return r; } -- Pedro Lamarão Desenvolvimento Intersix Technologies S.A. SP: (55 11 3803-9300) RJ: (55 21 3852-3240) www.intersix.com.br Your Security is our Business

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Re: [Boost-users] Weird cross compiling issue
by James Hughes 25 Jan '06

25 Jan '06

> From: Rene Rivera [mailto:grafik.list@redshift-software.com] > Sent: 23 January 2006 16:21 > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Weird cross compiling issue > > > James Hughes wrote: > > Hello all, > > > > I am cross compiling Boost to an embedded Linux Arm > architecture. I reported > > a problem a week or so ago with failures in some of the > libraries which I > > was unable to solve, and have a bit more information. > > > > One of the issues appears with the serialisation library. > Although I am > > compiling for Arm, the serialisation libs end up as Intel > X86 binaries, even > > though all the other successfully compiled libs are ARM. > This then leads to > > problems elsewhere with libraries that appear to need the > serialisation > > libs. > > > > I can only think that there is an issue with the make > system to do with > > serialisation area. > > > > Anyone have any comments/thoughts? > > Well I don't see anything that would make it not build with the same > compiler as the others. Are you sure it's not just a leftover > from some > previous build? Could you do a build with the "-d+2" option > to see which > commands it's invoking to compile? To verify that it's always > using the > cross compiler. I thought it odd too. I manually deleted all the files flagged as Intel binaries, then re-did the build, and hey presto, they reappeared - as Intel binaries!! I will try the debug option you suggest. > > > In addition, when I do a build to a particular directory: > > > > bjam > "-sGCC_ROOT_DIRECTORY=/opt/montavista/mobilinux/devkit/arm/iwmmxt_le" > > "-sGCC=iwmmxt_le-gcc" "-sGXX=iwmmxt_le-g++" stage > > > > the stage folder is created, in which is a lib folder, in > which are all the > > binaries (including the defective Intel ones). However, I > would also expect > > some header files somewhere - should there also be a h (or > header) folder > > next to lib? If not where are the headers I need to include > in my apps using > > Boost? > > The includes only show up if you do "install". Since you > obviously don't > want to obliterate your system Boost install you'll also have > to specify > the "--prefix" of where to install :-) Thanks - that's what I needed to know. I pressume I could simply copy the headers from the boost directory to where I need them - is this all the build/install does? James

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shared_ptr and typedef
by David A. Greene 25 Jan '06

25 Jan '06

Well, if nothing else, I'm learning lots about the corners of the language! I've got the following testcase: #include <boost/shared_ptr.hpp> #include <iostream> template<typename Base> class Handle { public: typedef boost::shared_ptr<Base> type; }; template<typename Type> void print_shared_ptr(boost::shared_ptr<Type> ptr) { std::cout << "Value is " << *ptr << std::endl; } template<typename Type> void print_handle(typename Handle<Type>::type ptr) { std::cout << "Value is " << *ptr << std::endl; } int main(void) { Handle<int>::type iptr(new int(10)); print_shared_ptr(iptr); print_handle<int>(iptr); print_handle(iptr); return(0); } The calls to print_shared_ptr and the first print_handle resolve just fine but the compiler (g++ 4.0.2) can't seem to resolve the final call to print_handle: shared_ptr.cc: In function 'int main()': shared_ptr.cc:29: error: no matching function for call to 'print_handle(boost::shared_ptr<int>&)' The point of class Handle is to hide the implementation detail that boost::shared_ptr is being used to manage resources. I would like the ability to easily change the type of smart pointer used throughout the application. What's going on here? Is there a way to make this work without having to explicitly specify the type to print_handle? Thanks. -Dave

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[BGL] Help with initialization of graph from image
by Jef Driesen 25 Jan '06

25 Jan '06

I'm trying to create a graph from an image, where pixel values are regions labels. I have defined my graph to use lists instead of the vectors (because I need to add/remove vertices and edges) and one extra property for the vertex (the region label): typedef boost::adjacency_list< boost::listS, // Adjacency list boost::listS, // Vertex list boost::undirectedS, // Undirected graph unsigned int, // Vertex property (=label) boost::no_property, // Edge property boost::no_property, // Graph property boost::listS // Edge list > graph; typedef boost::graph_traits<graph>::vertex_descriptor vertex_t; typedef boost::graph_traits<graph>::edge_descriptor edge_t; I have the following pseudo code to populate the graph: graph g; for each pixel (i,j) { unsigned int u_label = image[i][j]; for each neighbourhood pixel (k,l) { unsigned int v_label = image[k][l]; if (u_label != v_label) { // Find/add both vertices vertex_t u = boost::add_vertex(u_label,g); vertex_t v = boost::add_vertex(v_label, g); // Find/add edge boost::add_edge(u, v, g); } } } But this creates many duplicates (with regard to the label) for both vertices and edges. How can i prevent this? Would using a set for the edges solves my problem? And how can I add a vertex only if it does not exist already?

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[serialization] How to serializa reference counted C arrays?
by Lukasz Dobrek 25 Jan '06

25 Jan '06

Basically can anybody give me a hint how to properly serialize this class, using boost serialization library? Regards Lukasz class A { public: A( int size ) : m_size( size ) { m_ref_count = new int; *m_ref_count = 1; m_vec = new double [ m_size ]; } ~A(){ (*m_ref_count)--; if ( *m_ref_count == 0 ){ delete m_vec; } } A( const A & a ) : m_size ( a.m_size ) , m_ref_count( a.m_ref_count ) , m_vec( a.m_vec ) { (*m_ref_count)++; } int * m_ref_count; double * m_vec; int m_size; };

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Re: [Boost-users] thread library
by Sohail Somani 24 Jan '06

24 Jan '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Jens Theisen > Sent: Tuesday, January 24, 2006 10:33 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] thread library > > monade wrote: > > > Ok, it may be no memory leak, but only a harmless resource leak (as > > Alexandrescu calls it in his singleton chapter), but I don't like it > > anyway (my own singletons does not leak). > > If there would be a delete in the destructor, you would not > gain anything: > The destructor of a singleton is conceptually called on program > termination and that's also where all resources are freed by > the operating > system anyway. So it's perfectly reasonable to not free it. I could've sworn we just went through this a few months back. Perhaps its time to put a comment that links to the appropriate boost mailing thread. http://lists.boost.org/boost-users/2005/08/13538.php Might be related?

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[GRAPH] How to use an external edge weight map in dijkstra_shortest_paths
by rohit wadhwa 24 Jan '06

24 Jan '06

Hi, I am a newbie and have been struggling over the past couple of days with dijkstra_shortest_paths. I want to use WeightMap as an external property. I create the Graph as follows typedef boost::adjacency_list<boost::vecS,boost::vecS, boost::directedS,boost::no_property, boost::property<boost::edge_index_t, std::size_t> > Graph; I added edges using add_edge(fromVertex, toVertex, edge_index, Graph); My edge_index can have any long value and they are not necessarily in sequence. Also, I want to create the weight map on the fly and want to use a std::map. I have tried all sorts of things but to no avail. Any help will be appreciated. Thanks, Rohit.

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[iostreams] non-copyable device with Boost.Ref pattern
by Pedro Lamarão 24 Jan '06

24 Jan '06

Here follows a simple pattern to use Boost.IOstreams with your non-copyable Device, allowing you quick access to formatted input and output: #include <boost/iostreams/stream.hpp> #include <boost/ref.hpp> #include "foo_device.hpp" /* Don't; just to make lines shorter. */ using boost::iostreams; using boost; class foo_device; class foo_stream_base { public: /* Define constructor forwarding to foo_device. */ foo_stream_base (...) : _M_device(...) {} protected: foo_device _M_device; }; class foo_stream : private foo_stream_base, public stream<reference_wrapper<foo_device> > { public: /* Define constructor forwarding to foo_device. */ foo_stream (...) : foo_stream_base(...), stream<reference_wrapper<foo_device> >(ref(_M_device)) {} }; -- Pedro Lamarão Desenvolvimento Intersix Technologies S.A. SP: (55 11 3803-9300) RJ: (55 21 3852-3240) www.intersix.com.br Your Security is our Business

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