November 2011 - Boost-users - lists.preview.boost.org

[ublas]how to get tsm to compile with simple matrix args?
by Larry Evans 17 Nov '11

17 Nov '11

Compilation of the attached file with gcc4.7 produces obscure output: /home/evansl/download/gcc/4.7-20111008/install/bin/g++ -c -Wall -ftemplate-depth-300 -O0 -g3 -fno-inline -std=gnu++0x -I/home/evansl/prog_dev/boost-svn/ro/trunk/sandbox/rw/non_variadic_templates -I/home/evansl/prog_dev/boost-svn/ro/trunk -I../../.. -DTEMPLATE_DEPTH=300 solve_tridiag_ublas.cpp -MMD -o solve_tridiag_ublas.o In file included from solve_tridiag_ublas.cpp:2:0: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp: In instantiation of 'typename boost::numeric::ublas::matrix_matrix_solve_traits<E1, E2>::result_type boost::numeric::ublas::solve(const boost::numeric::ublas::matrix_expression<E1>&, const boost::numeric::ublas::matrix_expression<E1>&, C) [with E1 = boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >; E2 = boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> >; C = double; typename boost::numeric::ublas::matrix_matrix_solve_traits<E1, E2>::result_type = boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >]': /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/blas.hpp:387:48: required from 'M1& boost::numeric::ublas::blas_3::tsm(M1&, const T&, const M2&, C) [with M1 = boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >; T = double; M2 = boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >; C = double]' solve_tridiag_ublas.cpp:150:54: required from here /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: error: no matching function for call to 'inplace_solve(const boost::numeric::ublas::matrix_expression<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > > >&, boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type&, double)' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: candidates are: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1859:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::lower_tag, boost::numeric::ublas::column_major_tag, boost::numeric::ublas::dense_proxy_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1859:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1885:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::lower_tag, boost::numeric::ublas::column_major_tag, boost::numeric::ublas::packed_proxy_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1885:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1914:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::lower_tag, boost::numeric::ublas::column_major_tag, boost::numeric::ublas::unknown_storage_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1914:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1942:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::lower_tag, boost::numeric::ublas::column_major_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1942:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1950:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::lower_tag, boost::numeric::ublas::row_major_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1950:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1959:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::lower_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1959:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1967:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::unit_lower_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1967:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1977:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::upper_tag, boost::numeric::ublas::column_major_tag, boost::numeric::ublas::dense_proxy_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:1977:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2003:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::upper_tag, boost::numeric::ublas::column_major_tag, boost::numeric::ublas::packed_proxy_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2003:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2032:10: note: template<class E1, class E2> void boost::numeric::ublas::inplace_solve(const boost::numeric::ublas::matrix_expression<E1>&, boost::numeric::ublas::vector_expression<E2>&, boost::numeric::ublas::upper_tag, boost::numeric::ublas::column_major_tag, boost::numeric::ublas::unknown_storage_tag) /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2032:10: note: template argument deduction/substitution failed: /home/evansl/prog_dev/boost-svn/ro/trunk/boost/numeric/ublas/triangular.hpp:2587:9: note: 'boost::numeric::ublas::matrix_matrix_solve_traits<boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::matrix_binary_scalar1<const double, boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >, boost::numeric::ublas::scalar_multiplies<double, double> > >::result_type {aka boost::numeric::ublas::matrix<double, boost::numeric::ublas::basic_row_major<>, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >}' is not derived from 'boost::numeric::ublas::vector_expression<E2>' and it goes on and on. Looking at libs/numeric/ublas/test:23.cpp was no help since it looked like it was doing exactly what the attached code is doing. Please, what can I change to get the attached to compile? TIA. -regards, Larry

3 6

FWD: I figured I should share the wealth
by Olivier Tournaire 17 Nov '11

17 Nov '11

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1 0

Re: [Boost-users] The GMANE archive is not searchable
by Steinar Bang 17 Nov '11

17 Nov '11

>>>>> giecrilj(a)stegny.2a.pl: > The page "Boost Mailing Lists" [1] constains a hyperlink to what is > called "Gmane's searchable archive" [2]. However, the page in > question contains no search form; Actually the page in [2] does contain a search form at the bottom. However,... > Actually, it is possible to perform a search using the Group > Information interface [3]. Please adjust the hyperlink accordingly. ...personally I would have linked to [3], since that page has links to all ways of accessing the archives, statistics, as well as an easily visible search form. > [1] <URL: http://www.boost.org/community/groups.html#users > > [2] <URL: http://news.gmane.org/gmane.comp.lib.boost.user > > [3] <URL: http://dir.gmane.org/gmane.comp.lib.boost.user >

1 0

dubious range mismatch prerequisite
by Krzysztof Żelechowski 17 Nov '11

17 Nov '11

The documentation for mismatch, as applied to ranges, says that rng2 must be at least as long as rng1. Why is this precondition necessary? The precondition is impossible to evaluate for bare input iterators without destroying the iterators, whereupon it is impossible to call mismatch any more. IMHO, it would be perfectly reasonable to stop at the end of rng2 if rng2 is shorter. <URL: http://www.boost.org/doc/libs/1_47_0/libs/range/ doc/html/range/reference/algorithms/non_mutating/mismatch.html >

2 1

Re: [Boost-users] BOOST ASIO Strange behaviour
by Marat Abrarov 17 Nov '11

17 Nov '11

Hi, Gokul. > I am noticing consistently that DEBUG Version of ASIO is slightly faster > than the Release version consistently. The difference is around 5-10%. What does this 5-10% mean? Throughput? Regards, Marat Abrarov.

2 2

recursive_variant map recursion / incomplete type error
by Bodmer Marc 17 Nov '11

17 Nov '11

Hi I try to use boost::recursive_variant with a recursive std::map. There are several projects and examples on the internet using boost::recursive_variant exactly like I do and it seems to work there. But somehow I can not make it compile in my environment. I am using gcc 4.6.1 and boost 1.46.1. I've stripped my code down to this: ------------------------------------------------------------- #include <boost/variant.hpp> #include <map> typedef boost::make_recursive_variant< int, std::map<float, boost::recursive_variant_> >::type element; int main () { element i = 42; } But I always get these errors about uncomplete types (see attachments for full compiler output and code): ------------------------------------------------------------- /usr/include/c++/4.6/bits/stl_pair.h:93:11: error: 'std::pair<_T1, _T2>::second' has incomplete type /usr/include/boost/variant/variant_fwd.hpp:232:12: error: forward declaration of 'struct boost::recursive_variant_' used compile command: ------------------------------------------------------------ gcc recursive_variant_stripped.cpp 2> gccout.txt Thanks for any help and suggestions regards Marc

1 0

[boost-users] [regex] Problem on Solaris
by Kunth, Thomas (ext) 17 Nov '11

17 Nov '11

Hello! I am currently observing a strange crash on my test systems. The core file tells me that it happens when constructing a regular expression from a string for the first time. We are using boost 1.33.1. Please find below some system details. Configuration no. 1 is the current stable workung one. In configuration no. 2 my program crashes in the constructor of boost::regex. The crash seems to be caused by some threading related functions, but the application is single threaded. The call stack is attached to this e-mail. In configuration no. 3 my program does not crash, but hangs at nearly the same position inside the boost::regex constructor. Again inside some threading related functions of my single threaded application. It is related to my system configuration. Here are the ones I use: 1. This configuration works since years * Compilation of libboost_regex: SunOS 5.8 Generic_117350-35 sun4u sparc SUNW,Sun-Blade-2500 CC: Sun WorkShop 6 update 2 C++ 5.3 Patch 111685-24 2006/11/03 * Compilation of my application SunOS 5.8 Generic_117350-35 sun4u sparc SUNW,Sun-Blade-2500 CC: Sun WorkShop 6 update 2 C++ 5.3 Patch 111685-24 2006/11/03 * Execution environment SunOS 5.8 Generic_117350-35 sun4u sparc SUNW,Sun-Fire-V240 2. We are noe migrating to Solaris 10. This is causing problems. First we just change the execution environment: * Execution environment SunOS 5.10 Generic_141444-09 sun4u sparc SUNW,Sun-Fire-V210 3. Then we also change the compilation environment: * Compilation of libboost_regex is not changed. Libraries have not even been re-compiled. * Compilation of my application SunOS 5.10 Generic_141414-01 sun4u sparc SUNW,SPARC-Enterprise CC: Sun WorkShop 6 update 2 C++ 5.3 Patch 111685-24 2006/11/03 * Execution environment SunOS 5.10 Generic_141444-09 sun4u sparc SUNW,Sun-Fire-V210 I cannot change these configurations. But I would have the chance to move to a newer version of boost if it would compile with my legacy compiler (which it doesn't). Please help me solving this problem! Thanks in advance! With best regards, Thomas

1 0

Re: [Boost-users] [variant] declaring recursive variants (Jerry Jeremiah)
by 乔志强 17 Nov '11

17 Nov '11

binary '==' : no operator found which takes a left-hand operand of type 'const T2' and T2=config_iter so you need bool config_iter::operator == (const config_iter & other) const; struct config_iter { config_iter(const config::iterator iter) : iter_(iter) {} operator config::iterator() const { return iter_; } config::iterator operator() () const { return iter_; } //////ADD THIS////////////////////// bool operator == (const config_iter & other) const { return iter_ == other.iter_; } //////ADD THIS////////////////////// protected: config::iterator iter_; }; //////// SEE HERE /////////////////////////////////// 1>.\boost\variant\variant.hpp(781): error: binary '==' : no operator found which takes a left-hand operand of type 'const T2' (or there is no acceptable conversion) //////// SEE HERE /////////////////////////////////// 1> .\boost\blank.hpp(58): could be 'bool boost::operator ==(const boost::blank &,const boost::blank &)' 1> while trying to match the argument list '(const T2, const T2)' 1> .\boost\variant\variant.hpp(763) : see reference to function template instantiation 'bool boost::detail::variant::equal_comp::operator ()<T>(const T &,const T &) const' being compiled 1> with 1> [ 1> T=T2 1> ] 1> .\boost\variant\variant.hpp(832) : see reference to function template instantiation 'bool boost::detail::variant::comparer<Variant,Comp>::operator ()<const T>(const T &) const' being compiled 1> with 1> [ 1> Variant=boost::variant<std::string,long double,config_iter>, 1> Comp=boost::detail::variant::equal_comp, 1> T=T2 1> ] 1> .\boost\variant\detail\visitation_impl.hpp(130) : see reference to function template instantiation 'bool boost::detail::variant::invoke_visitor<Visitor>::internal_visit<const T>(T &,int)' being compiled 1> with 1> [ 1> Visitor=boost::detail::variant::comparer<boost::variant<std::string,long double,config_iter>,boost::detail::variant::equal_comp>, 1> T=T2 1> ] 1> .\boost\variant\detail\visitation_impl.hpp(173) : see reference to function template instantiation 'bool boost::detail::variant::visitation_impl_invoke_impl<Visitor,VoidPtrCV,T>(int,Visitor &,VoidPtrCV,T *,boost::mpl::true_)' being compiled 1> with 1> [ 1> Visitor=boost::detail::variant::invoke_visitor<boost::detail::variant::comparer<boost::variant<std::string,long double,config_iter>,boost::detail::variant::equal_comp>>, 1> VoidPtrCV=const void *, 1> T=T2 1> ] 1> .\boost\variant\detail\visitation_impl.hpp(256) : see reference to function template instantiation 'bool boost::detail::variant::visitation_impl_invoke<Visitor,VoidPtrCV,T2,NoBackupFlag>(int,Visitor &,VoidPtrCV,T *,NoBackupFlag,int)' being compiled 1> with 1> [ 1> Visitor=boost::detail::variant::invoke_visitor<boost::detail::variant::comparer<boost::variant<std::string,long double,config_iter>,boost::detail::variant::equal_comp>>, 1> VoidPtrCV=const void *, 1> NoBackupFlag=boost::variant<std::string,long double,config_iter>::has_fallback_type_, 1> T=T2 1> ] 1> .\boost\variant\variant.hpp(1776) : see reference to function template instantiation 'bool boost::detail::variant::visitation_impl<first_which,first_step,Visitor,VoidPtrCV,boost::variant<T0_,T1,T2>::has_fallback_type_>(const int,const int,Visitor &,VoidPtrCV,boost::mpl::false_,NoBackupFlag,Which *,step0 *)' being compiled 1> with 1> [ 1> Visitor=boost::detail::variant::invoke_visitor<boost::detail::variant::comparer<boost::variant<std::string,long double,config_iter>,boost::detail::variant::equal_comp>>, 1> VoidPtrCV=const void *, 1> T0_=std::string, 1> T1=long double, //////// SEE HERE /////////////////////////////////// 1> T2=config_iter, //////// SEE HERE /////////////////////////////////// 1> NoBackupFlag=boost::variant<std::string,long double,config_iter>::has_fallback_type_, 1> Which=first_which, 1> step0=first_step 1> ] // test program with config_iter and indentifier // doesn't compile if identifier::operator==() is in the program #include <boost/variant.hpp> #include <iterator> #include <string> #include <vector> #include <list> #include <map> struct config_iter; typedef boost::variant<std::string ,long double ,config_iter > var; typedef std::vector<var> value; typedef std::map<std::string,value> message; typedef std::map<std::string,message> config; struct config_iter { config_iter(const config::iterator iter) : iter_(iter) {} operator config::iterator() const { return iter_; } config::iterator operator() () const { return iter_; } protected: config::iterator iter_; }; struct identifier { identifier() : name_(""), version_({0}) { // std::cout << "identifier::identifier()" << std::endl; } identifier(const std::string & name, const value & version) : name_(name), version_(version) { // std::cout << "identifier::identifier(" << name << "," << version << ")" << std::endl; } bool operator == (const identifier & other) const { return name_ == other.name_ && version_ == other.version_; } private: // updated by constructor std::string name_; value version_; }; int main() { return 0; }

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Lisp/Scheme DSEL in C++?
by Nathan Ridge 17 Nov '11

17 Nov '11

Hello, I came across the following post on boost-users [1]: >> hello all, >> >> does anybody know of an existing spirit/lisp implimentation, and is there >> any interest in developing such a project in open source? > > None yet, AFAIK. > > I'll be writing an example for Spirit2 to complement the tiny-C > virtual machine in there. What's equally interesting though is > that scheme (or at least a subset of it) can be implemented in > pure c++. No parsing, just pure DSEL in C++. Now, imagine a > parser that targets this DSEL (through C++) -- a source to source > translator. Essentially, your scheme code will be compiled into > highly efficient C++. I find this quite intriguing, and I'm naturally led to ask two questions: 1. Which subset of Scheme can be implemented in this way, with a DSEL? 2. Has anyone actually done this? Thanks! Nate [1] http://thread.gmane.org/gmane.comp.lib.boost.user/30512

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[variant] declaring recursive variants
by Jerry Jeremiah 16 Nov '11

16 Nov '11

> Hello, Actually, I don't want a recursive variant in the normal recursive_wrapper sense. What I want is this: typedef std::list<a> alist; typedef std::list blist; typedef boost::variant<std::string ,long double ,alist::iterator ,blist::iterator ,config::iterator > var; typedef std::vector<var> value; typedef std::map<std::string,value> message; typedef std::map<std::string,message> config; But of course I can't do that because I have no idea how to forward declare config. I suspect that there is no way to do this, but I am not in the same league as everybody else when it comes to this stuff. Any suggestions? Thank you, Jerry

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