July 2007 - Boost - lists.boost.org

fusion unfused_typed problem
by Christian Holmquist 12 Jul '07

12 Jul '07

There seems to be some problem with fusion::unfused_typed<> and empty sequences, at least the way I'm trying to use it. The example below doesn't compile with boost::fusion::vector<> as the Sequence parameter to unfused_typed<>. Any clues, someone? template<class Sequence> struct foo { template<class Sig> struct result; template<> struct result<foo(Sequence)> { typedef void type; }; void operator()(Sequence const& seq) const { } }; void bar() { { typedef boost::fusion::vector<int> vec; boost::fusion::unfused_typed<foo<vec>, vec> f; f(1); // This works } { typedef boost::fusion::vector<> vec; boost::fusion::unfused_typed<foo<vec>, vec> f; f(); // this fails, error message below. } }; 1>c:\studio8\thirdparty\boost\boost\fusion\functional\adapter\detail\nullary_call_base.hpp(51) : error C2027: use of undefined type 'foo<Sequence>::result<Sig>' 1> with 1> [ 1> Sequence=vec 1> ] 1> and 1> [ 1> Sig=foo<vec> (boost::fusion::vector0) 1> ] 1> c:\studio8\thirdparty\boost\boost\fusion\functional\adapter\unfused_typed.hpp(76) : see reference to class template instantiation 'boost::fusion::detail::nullary_call_base<Derived,Function,Enable>' being compiled 1> with 1> [ 1> Derived=boost::fusion::unfused_typed<foo<vec>,vec>, 1> Function=foo<vec>, 1> Enable=true 1> ] 1> c:\studio8\thirdparty\boost\boost\fusion\functional\adapter\unfused_typed.hpp(86) : see reference to class template instantiation 'boost::fusion::detail::unfused_typed_impl<D,F,S,A,EO>' being compiled 1> with 1> [ 1> D=boost::fusion::unfused_typed<foo<vec>,vec>, 1> F=foo<vec>, 1> S=vec, 1> A=0, 1> EO=true 1> ] 1> c:\fail.cpp(86) : see reference to class template instantiation 'boost::fusion::unfused_typed<Function,Sequence>' being compiled 1> with 1> [ 1> Function=foo<vec>, 1> Sequence=vec 1> ] 1>c:\studio8\thirdparty\boost\boost\fusion\functional\adapter\detail\nullary_call_base.hpp(58) : error C2027: use of undefined type 'foo<Sequence>::result<Sig>' 1> with 1> [ 1> Sequence=vec 1> ] 1> and 1> [ 1> Sig=foo<vec> (boost::fusion::vector0) 1> ] Regards, Christian

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Boost inspection notification (2007-07-12/RC_1_34_0) *X*
by Rene Rivera 12 Jul '07

12 Jul '07

Boost Inspection Report Run Date: 16:08:59 UTC, Thursday 12 July 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11452 files scanned 909 directories scanned (including root) 162 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 70 broken links 21 unlinked files 22 file/directory names issues 2 files with tabs 9 violations of the Boost min/max guidelines 35 usages of unnamed namespaces in headers (including .ipp files) Summary: archive (3) bind (1) build (1) date_time (1) doc (2) filesystem (3) graph (3) iostreams (2) lambda (3) math (8) more (4) mpl (4) multi_array (2) ptr_container (1) python (8) regex (1) regression (32) serialization (1) test (81) type_traits (1) Details: *R* invalid (cr only) line-ending *A* invalid bookmarks, invalid urls, broken links, unlinked files *N* file/directory names issues *T* tabs in file *M* uses of min or max that have not been protected from the min/max macros, or unallowed #undef-s *U* unnamed namespace in header |archive| boost/archive/basic_streambuf_locale_saver.hpp: *N* name exceeds 31 characters boost/archive/impl/xml_wiarchive_impl.ipp: *U* unnamed namespace at line 53 boost/archive/iterators/remove_whitespace.hpp: *U* unnamed namespace at line 57 |bind| boost/bind/placeholders.hpp: *U* unnamed namespace at line 25 |build| tools/build/v2/test/test_system.html: *A* unlinked file |date_time| libs/date_time/xmldoc/date_time_docs_howto.html: *A* unlinked file |doc| doc/html/boost_math/inverse_complex.html: *A* unlinked file doc/html/jam.html: *A* unlinked file |filesystem| libs/filesystem/doc/do-list.htm: *A* invalid URL (hardwired file): file://?/ *A* invalid URL (hardwired file): file://?/UNC/ libs/filesystem/doc/tr2_proposal.html: *A* invalid URL (hardwired file): file:///C|/boost/site/libs/filesystem/doc/operations.htm#complete_note |graph| boost/graph/relax.hpp: *T* libs/graph/example/file_dependencies.cpp: *M* violation of Boost min/max guidelines on line 139 libs/graph/test/serialize.cpp: *T* |iostreams| libs/iostreams/doc/concepts/multi-character.html: *A* unlinked file libs/iostreams/doc/installation.html: *A* broken link: ../../../tools/build/v1/build_system.htm |lambda| boost/lambda/core.hpp: *U* unnamed namespace at line 62 boost/lambda/detail/lambda_functors.hpp: *U* unnamed namespace at line 25 boost/lambda/exceptions.hpp: *U* unnamed namespace at line 24 |math| libs/math/test/common_factor_test.cpp: *M* violation of Boost min/max guidelines on line 146 *M* violation of Boost min/max guidelines on line 147 *M* violation of Boost min/max guidelines on line 193 *M* violation of Boost min/max guidelines on line 194 |more| more/cvs.html: *A* unlinked file more/getting_started/unix-variants.html: *A* broken link: ../../doc/html/thread/build.html#thread.build more/getting_started/windows.html: *A* broken link: ../../doc/html/thread/build.html#thread.build more/separate_compilation.html: *A* broken link: ../libs/config/test/link/test/Jamfile.v2 |mpl| boost/mpl/alias.hpp: *U* unnamed namespace at line 17 libs/mpl/doc/refmanual/for-each.html: *A* broken link: ./value-initialized.html |multi_array| boost/multi_array/base.hpp: *U* unnamed namespace at line 69 libs/multi_array/test/generative_tests.hpp: *U* unnamed namespace at line 57 |ptr_container| libs/ptr_container/doc/tutorial_example.html: *A* unlinked file |python| libs/python/doc/building.html: *A* broken link: ../index.htm libs/python/doc/tutorial/doc/html/python/hello.html: *A* broken link: ../../../../../example/tutorial/Jamrules libs/python/doc/tutorial/index.html: *A* broken link: ../../../LICENSE_1_0.txt libs/python/doc/v2/May2002.html: *A* broken link: ../../../../tools/build/v1/build_system.htm *A* broken link: ../../../../tools/build/v1/gen_aix_import_file.py libs/python/doc/v2/faq.html: *A* broken link: ../../../../tools/build/v1/build_system.htm |regex| libs/regex/performance/input.html: *A* unlinked file |regression| regression/.htaccess: *N* leading character of ".htaccess" is not alphabetic tools/regression/test/test-cases/incremental/bjam.log.1: *N* name contains more than one dot character ('.') tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/compile-fail.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/completed.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/compile-fail.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/completed.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/lib.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/misfire.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/no-run.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/run_pyd.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/expected/test-case.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/test-case.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_is_test_log_complete/test-driver.xsl: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_re_match/expected/test_re_match.xml: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ tools/regression/xsl_reports/test/test-components/test_test_case_status/explicit-failures-markup.xml.test: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ *N* name contains more than one dot character ('.') *N* name exceeds 31 characters tools/regression/xsl_reports/test/test-components/test_test_structure/explicit-failures-markup.xml.test: *N* file path will exceed 100 characters in a directory tree with a root of the form boost_X_XX_X/ *N* name contains more than one dot character ('.') *N* name exceeds 31 characters tools/regression/xsl_reports/xsl/html/issues_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/library_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/library_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/make_tinyurl.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/summary_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/html/summary_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/issues_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/library_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/library_user_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/make_tinyurl.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/summary_developer_legend.html: *A* unlinked file tools/regression/xsl_reports/xsl/v2/html/summary_user_legend.html: *A* unlinked file |serialization| libs/serialization/src/basic_xml_grammar.ipp: *U* unnamed namespace at line 43 |test| boost/test/floating_point_comparison.hpp: *U* unnamed namespace at line 206 *U* unnamed namespace at line 228 boost/test/impl/cpp_main.ipp: *U* unnamed namespace at line 42 boost/test/impl/exception_safety.ipp: *U* unnamed namespace at line 400 boost/test/impl/framework.ipp: *U* unnamed namespace at line 199 boost/test/impl/plain_report_formatter.ipp: *U* unnamed namespace at line 45 boost/test/impl/progress_monitor.ipp: *U* unnamed namespace at line 38 boost/test/impl/results_collector.ipp: *U* unnamed namespace at line 106 boost/test/impl/results_reporter.ipp: *U* unnamed namespace at line 48 boost/test/impl/unit_test_log.ipp: *U* unnamed namespace at line 79 boost/test/impl/unit_test_monitor.ipp: *U* unnamed namespace at line 35 boost/test/impl/unit_test_parameters.ipp: *U* unnamed namespace at line 50 boost/test/results_collector.hpp: *U* unnamed namespace at line 40 boost/test/test_tools.hpp: *U* unnamed namespace at line 262 boost/test/utils/iterator/token_iterator.hpp: *U* unnamed namespace at line 166 boost/test/utils/named_params.hpp: *U* unnamed namespace at line 216 boost/test/utils/runtime/cla/dual_name_parameter.ipp: *U* unnamed namespace at line 43 boost/test/utils/runtime/cla/modifier.hpp: *U* unnamed namespace at line 34 boost/test/utils/runtime/env/modifier.hpp: *U* unnamed namespace at line 34 boost/test/utils/runtime/file/config_file.hpp: *U* unnamed namespace at line 169 *U* unnamed namespace at line 64 *U* unnamed namespace at line 74 boost/test/utils/runtime/file/config_file_iterator.hpp: *U* unnamed namespace at line 68 boost/test/utils/trivial_singleton.hpp: *U* unnamed namespace at line 52 *U* unnamed namespace at line 61 libs/test/build/msvc71_proj/config_file_iterator_test.vcproj: *N* name exceeds 31 characters libs/test/doc/components/prg_exec_monitor/compilation.html: *A* broken link: ../../../build/Jamfile libs/test/doc/components/prg_exec_monitor/index.html: *A* broken link: ../../../../../boost/test/cpp_main.hpp libs/test/doc/components/test_tools/index.html: *A* broken link: ../../tests/boost_check_equal_str.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_CLOSE.html: *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_MESSAGE.html: *A* broken link: BOOST_MESSAGE.html libs/test/doc/components/test_tools/reference/BOOST_CHECK_SMALL.html: *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/test_tools/reference/tools_list.html: *A* broken link: ../../btl1.gif *A* broken link: BOOST_CHECK_CLOSE_FRACTION.html libs/test/doc/components/utf/compilation.html: *A* broken link: ../../../build/Jamfile libs/test/doc/components/utf/components/index.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/components/test_case/abstract_interface.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/auto_register_facility.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/boost_function_tc.html: *A* broken link: ../../../../../../../boost/test/unit_test_suite_ex.hpp *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/class_tc.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/function_tc.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/index.html: *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/param_boost_function_tc.html: *A* broken link: ../../../../../../../boost/test/unit_test_suite_ex.hpp *A* broken link: ../../../btl1.gif libs/test/doc/components/utf/components/test_case/param_class_tc.html: *A* broken link: ../../../btl1.gif 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libs/test/doc/components/utf/parameters/index.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/parameters/log_format.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/parameters/log_level.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/parameters/no_result_code.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/parameters/output_format.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/parameters/random.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/parameters/report_format.html: *A* broken link: ../../../../../LICENSE_1_0.txt *A* broken link: ../../btl1.gif libs/test/doc/components/utf/parameters/report_level.html: *A* broken link: ../../btl1.gif libs/test/doc/components/utf/parameters/show_progress.html: *A* broken link: ../../btl1.gif libs/test/doc/examples/unit_test_example1.html: *A* broken link: ../../example/unit_test_example1.cpp 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1 0

Boost inspection notification (2007-07-12/RC_1_34_0) *LC*
by Rene Rivera 12 Jul '07

12 Jul '07

Boost Inspection Report Run Date: 16:09:06 UTC, Thursday 12 July 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11452 files scanned 909 directories scanned (including root) 1059 problems reported Problem counts: 661 files missing Boost license info or having wrong reference text 398 files missing copyright notice Summary: any (1) archive (1) build (68) concept_check (22) conversion (5) doc (1) filesystem (2) function (1) graph (1) inspect (1) integer (9) lambda (10) libs (6) logic (2) math (1) more (13) mpl (417) multi_array (13) numeric (188) optional (1) people (4) program_options (35) property_map (15) ptr_container (8) python (14) rational (5) regex (4) regression (118) release (2) serialization (16) signals (2) smart_ptr (8) test (3) timer (1) tr1 (2) tuple (5) utility (12) variant (42) Details: *L* missing Boost license info, or wrong reference text *C* missing copyright notice |any| libs/any/doc/ any.xml: *L* |archive| boost/archive/detail/ utf8_codecvt_facet.hpp: *L* |build| tools/build/v2/build/ build-request.jam: *L* modifiers.jam: *L* tools/build/v2/doc/ Jamfile.v2: *C* *L* tools/build/v2/doc/src/ advanced.xml: *C* *L* architecture.xml: *C* *L* catalog.xml: *C* *L* extending.xml: *C* *L* faq.xml: *C* *L* fragments.xml: *C* *L* howto.xml: *C* *L* install.xml: *C* *L* recipes.xml: *C* *L* reference.xml: *C* *L* standalone.xml: *C* *L* tutorial.xml: *C* *L* userman.xml: *C* *L* tools/build/v2/example/generate/ REAME.txt: *C* *L* a.cpp: *C* *L* tools/build/v2/example/generator/ README.txt: *C* *L* soap.jam: *C* *L* tools/build/v2/example/python_modules/ python_helpers.jam: *C* *L* python_helpers.py: *C* *L* tools/build/v2/test/ abs_workdir.py: *C* *L* dependency_property.py: *L* dependency_test.py: *C* *L* direct_request_test.py: *C* *L* dll_path.py: *L* double_loading.py: *L* duplicate.py: *L* echo_args.jam: *C* *L* empty.jam: *C* *L* expansion.py: *L* explicit.py: *L* gcc_runtime.py: *L* tools/build/v2/test/project-test3/lib3/ Jamfile: *C* *L* tools/build/v2/test/ readme.txt: *C* *L* svn_tree.py: *L* tag.py: *L* test_system.html: *L* tools/build/v2/tools/ sun.jam: *L* xsltproc.jam: *L* |concept_check| libs/concept_check/ bibliography.htm: *L* concept_check.htm: *L* concept_covering.htm: *L* creating_concepts.htm: *L* libs/concept_check/doc/ Jamfile.v2: *C* *L* libs/concept_check/doc/reference/ Assignable.xml: *L* BidirectionalIterator.xml: *L* CopyConstructible.xml: *L* DefaultConstructible.xml: *L* EqualityComparable.xml: *L* ForwardIterator.xml: *L* InputIterator.xml: *L* LessThanComparable.xml: *L* OutputIterator.xml: *L* RandomAccessIterator.xml: *L* SignedInteger.xml: *L* concepts.xml: *L* libs/concept_check/ implementation.htm: *L* prog_with_concepts.htm: *L* reference.htm: *L* using_concept_check.htm: *L* |conversion| libs/conversion/ cast.htm: *L* index.html: *C* *L* lexical_cast.htm: *L* libs/conversion/test/ Jamfile.v2: *L* |doc| doc/html/ docutils.css: *L* |filesystem| libs/filesystem/doc/ tr2_proposal.html: *L* libs/filesystem/src/ utf8_codecvt_facet.hpp: *L* |function| boost/function/detail/ gen_maybe_include.pl: *L* 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1 0

[Report] 0 regressions on RC_1_34_0 (2007-07-12)
by Douglas Gregor 12 Jul '07

12 Jul '07

Boost Regression test failures Report time: 2007-07-11T22:41:26Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_34_0/developer/i… No failures! Yay!

1 0

Spirit Questions
by Jarrad Waterloo 12 Jul '07

12 Jul '07

Question #1 of 3: How do I fix this error? [Note: This is still my original question.] 1>d:\documents and settings\jwaterloo\my documents\visual studio 2005\projects\json_parser\json_parser\json_parser.cpp(150) : error C2440: '<function-style-cast>' : cannot convert from 'phoenix::actor<BaseT>' to 'phoenix::stl::push_back' 1> with 1> [ 1> BaseT=phoenix::closure_member<0,phoenix::closure<std::vector<boost::any>,pho enix::nil_t,phoenix::nil_t,phoenix::nil_t,phoenix::nil_t,phoenix::nil_t>> 1> ] when p_array = '[' >> !(p_value[phoenix::stl::push_back(p_array.values)] % ',') >> ']'; where p_array has a context of the following struct any_s_closure : boost::spirit::closure<any_s_closure, vector<any> > { member1 values; }; and is declared as typedef rule<ScannerT, any_s_closure::context_t> rule_any_s; rule_any_s p_array; Question #2 of 3: What type should my iterator parameters be on the call operator when creating a custom semantic action functor? There are examples similar to this in the documentation but they didn't seem to work. struct my_functor { my_functor(std::string& str_) : str(str_) {} void operator()(char const* first, char const* last) const//std::string::const_iterator first, std::string::const_iterator last) const { str.assign(first, last); } std::string& str; }; struct nv_map_inserter { nv_map_inserter(nv_map& map, std::string& name, boost::any& value) : map(map), name(name), value(value) { //this->map = map; //this->name = name; //this->value = value; } void operator()(char const* first, char const* last) const//std::string::const_iterator first, std::string::const_iterator last) const { //str.assign(first, last); map.insert(nv_map::value_type(name, value)); } nv_map& map; std::string& name; boost::any& value; }; Question #3 of 3: How do I debug using '#define BOOST_SPIRIT_DEBUG' when using closures with a member of any? Any needs stream operators which it doesn't have. I know this may be an idiot question but I am asking it anyway because I tried the following 2 and could get neither to work. Any assistance would be appreciated. template<class Ch, class Tr> basic_ostream<Ch, Tr>& operator<<(basic_ostream<Ch, Tr>& s, const boost::any z) { if(z.empty()) s << "null"; else if(operand.type() == typeid(double)) s << any_cast<double>(z); else if(operand.type() == typeid(bool)) s << any_cast<bool>(z); else if(operand.type() == typeid(std::string)) s << any_cast<std::string>(z); else if(operand.type() == typeid(std::vector<boost::any>)) s << any_cast<std::vector<boost::any> >(z); else if(operand.type() == typeid(std::map<std::string, boost::any>)) s << any_cast<std::map<std::string, boost::any> >(z); return s; } ostream& operator<<(ostream& s, const boost::any z) { if(z.empty()) s << "null"; else if(z.type() == typeid(double)) s << any_cast<double>(z); else if(z.type() == typeid(bool)) s << any_cast<bool>(z); else if(z.type() == typeid(std::string)) s << any_cast<std::string>(z); else if(z.type() == typeid(std::vector<boost::any>)) s << any_cast<std::vector<boost::any> >(z); else if(z.type() == typeid(std::map<std::string, boost::any>)) s << any_cast<std::map<std::string, boost::any> >(z); return s; } Source Follows: // json_parser.cpp : Defines the entry point for the console application. // //#define BOOST_SPIRIT_DEBUG #include "stdafx.h" #include "stl_containers.hpp" #include <iostream> #include <string> #include <vector> #include <map> #include <boost/spirit.hpp> #include <boost/spirit/actor/insert_at_actor.hpp> #include <boost/any.hpp> #include <boost/spirit/phoenix/primitives.hpp> //#include <boost/spirit/phoenix.hpp> using namespace std; using namespace boost; using namespace boost::spirit; using namespace phoenix; struct any_s_closure : boost::spirit::closure<any_s_closure, vector<any> > { member1 values; }; struct nv_map_closure : boost::spirit::closure<nv_map_closure, map<string, any> > { member1 values; }; struct double_closure : boost::spirit::closure<double_closure, double> { member1 double_closure_value; }; struct name_closure : boost::spirit::closure<name_closure, string> { member1 name; }; struct value_closure : boost::spirit::closure<value_closure, any> { member1 value_closure_value; }; struct nvpair_closure : boost::spirit::closure<nvpair_closure, string, any> { member1 name; member2 value; }; typedef map<string, any> nv_map; struct json_parser : public grammar<json_parser, value_closure::context_t> { json_parser() {} template <typename ScannerT> struct definition { definition(json_parser const& self) { p_nvpair = p_string[p_nvpair.name = p_string.name]//construct_<std::string>(arg1, arg2)] >> ':' >> p_value[p_nvpair.value = p_value.value_closure_value];//[p_nvpair.value = construct_<std::string>(arg1, arg2)]; p_string = confix_p('"', *c_escape_ch_p, '"')[p_string.name = construct_<std::string>(arg1, arg2)]; p_number = real_p[p_number.double_closure_value = arg1];//assign_a(p_number.double_closure_value)]; p_object = '{'//ch_p('{')[p_object.value = nv_map()] >> !list_p(p_nvpair/*[insert_at_a(any_cast<nv_map>(p_object.value), p_nvpair.name, p_nvpair.value)]*/, ',') >> '}'; p_array = '['//ch_p('[')[p_array.value = std::vector<any>()] //>> !(p_value[push_back_a(any_cast<std::vector<any> >(p_array.value), p_value.value)] % ',')//!list_p(p_value[push_back_a(any_cast<std::vector<any>&>(/*p_array.val* /std::vector<any>()), /*p_value.val*/true)], ',') >> !(p_value[phoenix::stl::push_back(p_array.values)/*, arg1)*/]/*[push_back_a(p_array.values, p_value.value)]*/ % ',')//!list_p(p_value[push_back_a(any_cast<std::vector<any>&>(/*p_array.val* /std::vector<any>()), /*p_value.val*/true)], ',') >> ']'; p_value = str_p("null")[p_value.value_closure_value = any()] || str_p("true")[p_value.value_closure_value = true] || str_p("false")[p_value.value_closure_value = false] || p_number[p_value.value_closure_value = arg1] || p_string[p_value.value_closure_value = arg1] //|| p_object//[p_value.value_closure_value = p_object.values] || p_array[p_value.value_closure_value = arg1];//[p_value.value_closure_value = p_array.values] top = p_value[self.value_closure_value = arg1]; } typedef rule<ScannerT, value_closure::context_t> rule_t; rule_t p_value; typedef rule<ScannerT, double_closure::context_t> rule_d; rule_d p_number; typedef rule<ScannerT, name_closure::context_t> rule1_t; rule1_t p_string; typedef rule<ScannerT, nvpair_closure::context_t> rule2_t; rule2_t p_nvpair; typedef rule<ScannerT, any_s_closure::context_t> rule_any_s; rule_any_s p_array; typedef rule<ScannerT, nv_map_closure::context_t> rule_nv_map; rule_nv_map p_object; rule<ScannerT> top; rule<ScannerT> const& start() const { return top; } }; bool isValid(char const* str, any& returnData) const { return boost::spirit::parse(str, (*this)[var(returnData) = arg1], space_p).full;//parse_info<> info } }; int _tmain(int argc, _TCHAR* argv[]) { try { any returnData; json_parser jp; cout << "Test 1: \"\"Hello\nWorld\"\" = " << jp.isValid("\"Hello\nWorld\"", returnData) << endl; cout << "Return: Type = " << returnData.type().name() << ", Value = " << any_cast<string>(returnData) << endl; cout << "Test 2: \"45.62\" = " << jp.isValid("45.62", returnData) << endl; cout << "Return: Type = " << returnData.type().name() << ", Value = " << any_cast<double>(returnData) << endl; cout << "Test 3: \"[1, 2, 3, 4, 5]\" = " << jp.isValid("[1, 2, 3, 4, 5]", returnData) << endl; cout << "Return Type = " << returnData.type().name() << endl; cout << "The array has " << any_cast<vector<any> >(returnData).size() << " items." << endl; //cout << "Return Value = " << any_cast<vector<any> >(returnData) << endl; //cout << "Return: Type = " << returnData.type().name() << ", Value = " << any_cast<<vector<any> >(returnData) << endl; cout << "Test 4: \"{\"field1\" : 7, \"field2\" : 45.32, \"field3\" : \"www.goto.com\"}\" = " << jp.isValid("{\"field1\" : 7, \"field2\" : 45.32, \"field3\" : \"www.goto.com\"}", returnData) << endl; cout << "Test 5: \"true\" = " << jp.isValid("true", returnData) << endl; cout << "Return: Type = " << returnData.type().name() << ", Value = " << any_cast<bool>(returnData) << endl; cout << "Test 6: \"false\" = " << jp.isValid("false", returnData) << endl; cout << "Return: Type = " << returnData.type().name() << ", Value = " << any_cast<bool>(returnData) << endl; cout << "Test 7: \"null\" = " << jp.isValid("null", returnData) << endl; cout << "Return: Value = " << (returnData.empty() ? "null" : "not null") << endl; cout << "Test 8: \"'Hello\nWorld'\" = " << jp.isValid("'Hello\nWorld'", returnData) << endl; cout << "Test 9: \"45.62f\" = " << jp.isValid("45.62f", returnData) << endl; cout << "Test 10: \"[1, 2, 3, 4, 5)\" = " << jp.isValid("[1, 2, 3, 4, 5)", returnData) << endl; cout << "Test 11: \"{\"field1\" : 7, 'field2' : 45.32, \"field3\" : \"www.goto.com\"}\" = " << jp.isValid("{\"field1\" : 7, 'field2' : 45.32, \"field3\" : \"www.goto.com\"}", returnData) << endl; cout << "Test 12: \"TRUE\" = " << jp.isValid("TRUE", returnData) << endl; cout << "Test 13: \"FALSE\" = " << jp.isValid("FALSE", returnData) << endl; cout << "Test 14: \"NULL\" = " << jp.isValid("NULL", returnData) << endl; } catch(exception& e) { cout << e.what() << endl; } return 0; } Concluding Remarks I hate parsing unfortunately it is necessary and Spirit looks like it can make parsing fun. Creating grammars and doing validation is easy but getting past the semantic actions learning curve is time consuming. Additional documentation on slightly more complex hierarchies that doesn't use globals but instead uses closures would be appreciated in the future. P.S. For other learners, '#include "stl_containers.hpp" needs to come before any boost header due to macro redefinitions.

2 1

[Boost.Parameter] questions and advice
by Andrew Sutton 12 Jul '07

12 Jul '07

Boost, I've been working on parts of the Boost.Graph library as part of my Google Summer of Code project. Part of this has been implementing some new algorithms. Jeremy Siek (mentor) and I had briefly discussed using the new Boost.Parameter library instead of the older BGL Named Params solution for building the interfaces to these new algorithms. In fact, we had also talked about the possibility of migrating existing algorithms to use that style. So... after some initial experimentation, I've come up with some questions. I've just finished reading most of the original reviews for Boost.Parameter library. They weren't that helpful. 1. It seems to me that functions with named parameters are limited to 5 parameters (both required and optional) - at least under GCC 4.1.2. Is this right? If I try to add a 6th, I get a number of compiler errors of the form "6 arguments given (5 expected)" and so forth. Maybe I need to build these explicitly and avoid the macros. There are a number of algorithms in Boost.Graph for which this would be a showstopper. 2. I've run into the situation where parameters are truly optional - they don't specify default values, but optional components to an algorithm. What's the best way to implement this? How can I test (within a function) to determine if a parameter has been passed or not? I've hacked together an approach using a `not_given` struct. Is there something already like this in the library. 3. And the big kind of fuzzy question: Is there any general documented advice on building procedural interfaces with numerous default and replaceable arguments? These are all related to interface design and, if anybody responds, might generate some interesting discussion. Specific questions: - At what point should an interface consider migrating to a named parameter solution instead of providing overloads?. For example, I could probably write many of my algorithms using overloads, but in order to be consistent with Boost.Graph (and other reasons) I'd like to use Boost.Parameter. - Which is better: executing behavior based on type or value parameters and when would each be appropriate? For example, should I pass a bool or enum flag to the function and make decisions at runtime, or should I define some policy- or tag-style structs and use template instantiation to determine behavior at compile time? - What's the best way to document these interfaces. Aside from Boost.Graph, I haven't yet seen any libraries, but those are documented for BGL named params. How do you describe the signature of a function that's declared as a macro? Any thoughts at all == very much appreciated. Thanks, Andrew Sutton asutton(a)cs.kent.edu

5 13

How to represent underspecified Date in boost::date_time library?
by Martin Min 12 Jul '07

12 Jul '07

Hi, recently I found boost::date_time is a great library to work with for temporal work. But now I have a problem for your help with or input. It looks like the constructor of 'date' has three parameters year, month, day. What about if I just want to construct a Date with 'year'?, because this is typical in text, like "In 1991, ...". Is this possilbe? If not, is there any way around this limitation? or even more, can I represent sth like "In the 21st century", or "the winter of 1998"? But now, for me it is important to represent dates like "1998", without any month or day mentioned. Thanks for your time.

4 7

[Report] 0 regressions on RC_1_34_0 (2007-07-12)
by Douglas Gregor 12 Jul '07

12 Jul '07

Boost Regression test failures Report time: 2007-07-11T12:57:44Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_34_0/developer/i… No failures! Yay!

1 0

Change arbitrary collection element type?
by Marat Khalili 12 Jul '07

12 Jul '07

Hello all, Are there any standard means to clone collection class while changing only element type? Like receiving some_collection<int> as a template parameter and creating some_collection<string> without knowing what exactly some_collection is. In case there are none, is anyone interested to see it as a standalone library? With Best Regards, Marat

5 6

Anonymous tickets
by Vladimir Prus 11 Jul '07

11 Jul '07

Say I'm looking at http://svn.boost.org/trac/boost/ticket/1056 and have a question to the bug's submitter. Unfortunately, the bug's submitter is 'anonymous', and no email address can be seen anywhere. Can Trac be configured to reject submission that don't include an email address? - Volodya

1 0