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[parameter] accessing param type within signature
by Lorenzo Caminiti 09 May '10

09 May '10

Hello all, I am new to Boost.Parameter. I am having troubles getting the depth_first_search() example from the documentation section 2.1.5.6.2 to compile. Was the example in section 2.1.5.6.2 even compiled? If so, can someone point to the code that can be compiled? (I did look into Boost sandbox libs/parameter/... but I did not see it there.) 1) I need to access graph_type to write type requirements of following parameters. 2) The documentation section 2.1.5.6.1 says I can use graph_type (or xyz_type in general) from within the signature to refer to the parameter type. However, that seems not to be the case (also looking at the preprocessed code, xyz_type is a template parameter available only in the function body but not in the signature). 3) The documentation section 2.1.5.6.2 seems to use tag::graph::_ instead of graph_type to access the type (also sometimes graphs::graph::_ is used but I think that might be a typo... because the tag namespace should be there as in graphs::tag::graph::_). 4) Finally, even when I try to use tag::graph::_ to refer to graph_type, I get the GCC error below. What am I doing wrong? // File: g00.cpp #include <boost/parameter.hpp> namespace graphs { BOOST_PARAMETER_NAME(graph) BOOST_PARAMETER_NAME(graph2) BOOST_PARAMETER_FUNCTION( (void), depth_first_search, tag, (required (graph, *) (graph2, (tag::graph::_)) // Trying to use graph's type here... but I can't use graph_type and graph::_ does not compile... ) ) { // Here I can use graph_type. } } // namespace int main() { graphs::depth_first_search(1, 2); return 0; } $ g++ -Wall -Werror -I./src -DCONTRACT_CHECK_BLOCK_INVARIANT -DCONTRACT_CHECK_CLASS_INVARIANT -DCONTRACT_CHECK_PRECONDITION -DCONTRACT_CHECK_POSTCONDITION example/Own/parameter/g00.cpp /usr/include/boost/parameter/value_type.hpp: In instantiation of ‘boost::parameter::value_type<mpl_::arg<2>, graphs::tag::graph, boost::parameter::void_>’: example/Own/parameter/g00.cpp:9: instantiated from ‘typename graphs::boost_param_result_17depth_first_search<Args>::type graphs::boost_param_impldepth_first_search(const Args&) [with Args = boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<graphs::tag::graph2, const int>, boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<graphs::tag::graph, const int>, boost::parameter::aux::empty_arg_list> >]’ example/Own/parameter/g00.cpp:9: instantiated from ‘typename graphs::boost_param_result_17depth_first_search<typename boost::parameter::aux::argument_pack<graphs::boost_param_params_17depth_first_search<int>, const ParameterArgumentType0, const ParameterArgumentType1, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::type>::type graphs::depth_first_search(const ParameterArgumentType0&, const ParameterArgumentType1&, typename boost::parameter::aux::match<graphs::boost_param_params_17depth_first_search<int>, ParameterArgumentType0, ParameterArgumentType1, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::type) [with ParameterArgumentType0 = int, ParameterArgumentType1 = int]’ example/Own/parameter/g00.cpp:24: instantiated from here /usr/include/boost/parameter/value_type.hpp:60: error: no type named ‘binding’ in ‘struct mpl_::arg<2>’ /usr/include/boost/parameter/value_type.hpp:62: error: no type named ‘binding’ in ‘struct mpl_::arg<2>’ example/Own/parameter/g00.cpp: In function ‘typename graphs::boost_param_result_17depth_first_search<Args>::type graphs::boost_param_impldepth_first_search(const Args&) [with Args = boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<graphs::tag::graph2, const int>, boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<graphs::tag::graph, const int>, boost::parameter::aux::empty_arg_list> >]’: example/Own/parameter/g00.cpp:9: instantiated from ‘typename graphs::boost_param_result_17depth_first_search<typename boost::parameter::aux::argument_pack<graphs::boost_param_params_17depth_first_search<int>, const ParameterArgumentType0, const ParameterArgumentType1, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::type>::type graphs::depth_first_search(const ParameterArgumentType0&, const ParameterArgumentType1&, typename boost::parameter::aux::match<graphs::boost_param_params_17depth_first_search<int>, ParameterArgumentType0, ParameterArgumentType1, boost::parameter::void_, boost::parameter::void_, boost::parameter::void_>::type) [with ParameterArgumentType0 = int, ParameterArgumentType1 = int]’ example/Own/parameter/g00.cpp:24: instantiated from here example/Own/parameter/g00.cpp:9: error: no matching function for call to ‘boost::parameter::aux::cast<void ()(boost::parameter::value_type<mpl_::arg<2>, graphs::tag::graph, boost::parameter::void_>)>::execute(const int&)’ /usr/include/boost/parameter/aux_/cast.hpp:99: note: candidates are: static boost::parameter::aux::use_default_tag boost::parameter::aux::cast<void ()(T)>::execute(boost::parameter::aux::use_default_tag) [with T = boost::parameter::value_type<mpl_::arg<2>, graphs::tag::graph, boost::parameter::void_>] /usr/include/boost/parameter/aux_/cast.hpp:109: note: static T boost::parameter::aux::cast<void ()(T)>::execute(T) [with T = boost::parameter::value_type<mpl_::arg<2>, graphs::tag::graph, boost::parameter::void_>] example/Own/parameter/g00.cpp:9: error: return-statement with a value, in function returning 'void' $ g++ --version g++ (GCC) 4.2.4 (Ubuntu 4.2.4-1ubuntu4) Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. I have tried this on Boost 1.42.0 and 1.34.1 (same errors). Thank you very much. -- Lorenzo

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Problem with Property Tree under WinXP, Eclipse, mingw
by Rouven Walter 09 May '10

09 May '10

Hello, I have posted the message below in the users boost mailinglist before. But there was no satisfying answer, so I decided to post it once again on the developers list. It seems to be a more technical problem. I'm looking forward for your answers, thanks, Cyraid ---- Hello, I use Windows XP with MinGW and Eclipse for C++ developing. I want to use the xml parser included in the property tree library of boost. I started trying the example at [1]http://www.boost.org/doc/libs/1_43_0/doc/html/boost_propertytree/tutorial .html but it failed with the following error: **** Build of configuration Debug for project Test CPP Project **** **** Internal Builder is used for build **** g++ -IC:\Programme\boost_1_42_0 -O0 -g3 -Wall -c -fmessage-length=0 -osrc\Test.o ..\src\Test.cpp C:/Programme/boost_1_42_0/boost/property_tree/detail/ptree_utils.hpp:In function `std::string boost::property_tree::detail::narrow(const Ch*) [with Ch = wchar_t]': C:/Programme/boost_1_42_0/boost/property_tree/string_path.hpp:62: instantiated from here C:/Programme/boost_1_42_0/boost/property_tree/detail/ptree_utils.hpp:76: warning: comparison between signed and unsigned integer expressions C:/Programme/boost_1_42_0/boost/property_tree/detail/ptree_utils.hpp:76: warning: comparison is always false due to limited range of data type C:/Programme/boost_1_42_0/boost/property_tree/detail/xml_parser_read_rapidxm l.hpp: In function `void boost::property_tree::xml_parser::read_xml_internal(std::basic_istream<typen ame Ptree::key_type::value_type, std::char_traits<typename Ptree::key_type::value_type> >&, Ptree&, int, const std::string&) [with Ptree = boost::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >]': C:/Programme/boost_1_42_0/boost/property_tree/xml_parser.hpp:85: instantiated from `void boost::property_tree::xml_parser::read_xml(const std::string&, Ptree&, int, const std::locale&) [with Ptree = boost::property_tree::ptree]' ..\src\Test.cpp:39: instantiated from here C:/Programme/boost_1_42_0/boost/property_tree/detail/xml_parser_read_rapidxm l.hpp:108: error: non-constant `(((int)f_c) | 3072)' cannot be used as template argument C:/Programme/boost_1_42_0/boost/property_tree/detail/xml_parser_read_rapidxm l.hpp:108: error: no matching function for call to `rapidxml::xml_document<char>::parse(char*)' Build error occurred, build is stopped Time consumed: 4109 ms. I have included the necessary header files in the eclipse project properties. For me, the error message seems to be some internal failure in the library? Or where could I have done a mistake ? Best regards, Cyraid GRATIS: Movie-Flat mit über 300 Top-Videos. Für WEB.DE Nutzer dauerhaft kostenlos! Jetzt freischalten unter http://movieflat.web.de References 1. http://www.boost.org/doc/libs/1_43_0/doc/html/boost_propertytree/tutorial.h…

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[1.43.0] PDF build of docs now available.
by John Maddock 09 May '10

09 May '10

The PDF build of the documentation for 1.43 (for those libraries that support this) is now available from the sourceforge download page: http://sourceforge.net/projects/boost/files/ The direct links are: http://sourceforge.net/projects/boost/files/boost-docs/1.43.0/boost_pdf_1_4… http://sourceforge.net/projects/boost/files/boost-docs/1.43.0/boost_pdf_1_4… http://sourceforge.net/projects/boost/files/boost-docs/1.43.0/boost_pdf_1.4… http://sourceforge.net/projects/boost/files/boost-docs/1.43.0/boost_pdf_1.4… Enjoy! John.

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Problem building Boost test framework
by Matthias Troyer 09 May '10

09 May '10

Hi, I am trying to build the libraries for the Boost test framework myself (using my own CMake files) instead of using bjam. When trying to link the file execution_monitor.cpp debug.cpp cpp_main.cpp into a dynamic library libboost_prg_exec_monitor.dylib I get the following linker erros: Linking CXX shared library libboost_prg_exec_monitor.dylib ld: warning: duplicate dylib /usr/lib/libpthread.dylib Undefined symbols: "boost::debug::attach_debugger(bool)", referenced from: _execution_monitor_attaching_signal_handler in execution_monitor.cpp.o "boost::debug::under_debugger()", referenced from: boost::execution_monitor::execute(boost::unit_test::callback0<int> const&)in execution_monitor.cpp.o Do I need to link additional files? Matthias

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[xint] Third release is ready, requesting preliminary review
by Chad Nelson 09 May '10

09 May '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I'm happy to announce that the third release of the Extended Integer library is ready, in both the sandbox and the Vault. This is a major overhaul of the library, taking into account all of the feedback and recommendations provided on the first two: * The exception-blocking system is gone, replaced by a separate nothrow_integer class. * There's now a fixed_integer class template as well. * The test functions now use Boost.Test, and the documentation has been moved to Doxygen. * Nearly every function received a thorough examination as well; many of them were tweaked, and a few completely replaced. Please take a look and let me know what you think of the changes. I'm very happy with them. - -- Chad Nelson Oak Circle Software, Inc. * * * -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkvabA0ACgkQp9x9jeZ9/wSwvACcCJ18QkRbKWmByYO7Q1xe6qYx EUYAnRl4+mzw9X2VvGCCFPl0Q0VWLhRN =fhbW -----END PGP SIGNATURE-----

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Re: [boost] [rfc] Preliminary Hash Library
by Sean Chittenden 08 May '10

08 May '10

re: Possible namespaces. Why not use boost::digest? "Cryptographic hashes" are more pedantically known as one-way digests of blobs of data. A "hash," as hijacked by perl (or dictionary, or unordered_map), is an ADT comprised of a digest of a key and a value. crc's a digest as well, but for legacy reasons already has a top-level namespace. Some digests are crypto grade, some aren't, but they all fall in to the digest category. $0.02. -sc -- Sean Chittenden sean(a)chittenden.org

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[constrained-value] with 1.43.0
by Neal Becker 08 May '10

08 May '10

I found my code using constrained_value compiles with boost-1.42.0, but not with 1.43.0. Rather mysterious error message: /usr/local/src/boost.hg/boost/constrained_value/constrained.hpp:64: error: 'template<class ExceptionType> struct boost::constrained_value::throw_exception' is not a function, /usr/local/src/boost.hg/boost/throw_exception.hpp:74: error: conflict with 'template<class E> void boost::throw_exception(const E&)' /usr/local/src/boost.hg/boost/throw_exception.hpp:54: error: in call to 'throw_exception' scons: *** [mod/fixed_pt.os] Error 1

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[proto][can_be_called]
by Andy Venikov 08 May '10

08 May '10

Currently, can_be_called<> expects only functors. Is it possible to extend it so that it can take any type and return true if that type can be called with the list of given parameters. For example, function<int (int, char, long)> functor; int f(int, char, long); int dummyInt; int main(int argc, char ** argv) { assert(false == test(functor, argc, 11, argv)); assert(true == test(functor, 10, 11, 12)); assert(true == test(f, 10, 11, 12)); assert(false == test(dummyInt, 1)); } Thanks, Andy.

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Re: [boost] [castor] Interest in Logic Paradigm for C++ ?
by William Byrd 08 May '10

08 May '10

Hi Roshan! I'm a newbie C++ programmer, but I have experience designing logic programming languages (e.g., miniKanren in Scheme). I'm curious why Castor doesn't implement full unification. Is this because of the historical relationship between Castor and Leda? There are many interesting logic programs that can't be written naturally without full unification. (My dissertation contains many such programs, so I'm biased!) Many people in the logic programming community don't consider Mercury to be a real logic programming language precisely because it doesn't support full unification. Is Castor aiming towards the Mercury model, with the idea of adding mode annotations, etc., in the future? That might be a nice sweet spot for the Boost libraries. Otherwise, I would prefer to see full unification in any official Boost logic programming language/library. How hard would it be to add full unification to Castor, or to at least allow full unification as an option? --Will

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Re: [boost] [rfc] Preliminary Hash Library
by Minh Phanivong 08 May '10

08 May '10

How about boost::hash_algo? Sent from my iPhone On 08/05/2010, at 11:51 PM, "Stewart, Robert" <Robert.Stewart(a)sig.com> wrote: Scott McMurray wrote: On 6 May 2010 06:01, Daniel James <dnljms(a)gmail.com> wrote: This will collide with the existing 'boost::hash' (an implementation of 'std::hash'). The simplest fix would be just changing the namespace to boost::hashes. Alternatively, the library could be renamed to Cryptographic_Hash and use boost::cryptographic_hash as its namespace, though that would cut off the possibility of following Paul Bristow's suggestion. Adding just one letter at the end makes for a rather slim differentiator, but I don't think it will hurt. We already have boost::tuple and boost::tuples, right? Unless you intend to create the Boost Cryptographic Hashing Library versus one that supports a wider range of hashing algorithms, don't include "cryptographic" in the name or namespace. What about Boost Hashing Algorithms Library with namespace boost::hashing_algorithms? A handy namespace alias would be "hal" or "ha." ;) _____ Rob Stewart robert.stewart(a)sig.com Software Engineer, Core Software using std::disclaimer; Susquehanna International Group, LLP http://www.sig.com IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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