Re: [Boost-bugs] [Boost C++ Libraries] #8022: gcc: json_parser_read.hpp:116: warning: unused parameter 'e' [-Wunused-parameter]

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8022: gcc: json_parser_read.hpp:116: warning: unused parameter 'e' [-Wunused-parameter]
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-07-18 08:36:05

#8022: gcc: json_parser_read.hpp:116: warning: unused parameter 'e' [-Wunused-
parameter]
-------------------------------+---------------------------
  Reporter:  anonymous         |      Owner:  cornedbee
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  property_tree
   Version:  Boost 1.52.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+---------------------------
Changes (by mloskot):

 * cc: mateusz@… (added)


Old description:

> gcc version 4.7.2 (Built by MinGW-builds project) i686-w64-mingw32
>
> yields
>
> /boost/property_tree/detail/json_parser_read.hpp: In instantiation of
> 'void
> boost::property_tree::json_parser::context<Ptree>::a_char::operator()(boost::property_tree::json_parser::context<Ptree>::It,
> boost::property_tree::json_parser::context<Ptree>::It) const [with Ptree
> = boost::property_tree::basic_ptree<std::basic_string<char>,
> std::basic_string<char> >;
> boost::property_tree::json_parser::context<Ptree>::It =
> __gnu_cxx::__normal_iterator<char*, std::vector<char,
> std::allocator<char> > >]':
> boost/spirit/home/classic/core/scanner/scanner.hpp:148:13:   required
> from 'static void
> boost::spirit::classic::attributed_action_policy<boost::spirit::classic::nil_t>::call(const
> ActorT&, boost::spirit::classic::nil_t, const IteratorT&, const
> IteratorT&) [with ActorT =
> boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
> std::basic_string<char> > >::a_char; IteratorT =
> __gnu_cxx::__normal_iterator<char*, std::vector<char,
> std::allocator<char> > >]'
> boost/spirit/home/classic/core/scanner/scanner.hpp:163:13:   required
> from 'void boost::spirit::classic::action_policy::do_action(const
> ActorT&, AttrT&, const IteratorT&, const IteratorT&) const [with ActorT =
> boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
> std::basic_string<char> > >::a_char; AttrT =
> boost::spirit::classic::nil_t; IteratorT =
> __gnu_cxx::__normal_iterator<char*, std::vector<char,
> std::allocator<char> > >]'
> boost/spirit/home/classic/core/composite/actions.hpp:116:17:   required
> from 'typename
> boost::spirit::classic::parser_result<boost::spirit::classic::action<ParserT,
> ActionT>, ScannerT>::type boost::spirit::classic::action<ParserT,
> ActionT>::parse(const ScannerT&) const [with ScannerT =
> boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
> std::vector<char, std::allocator<char> > >,
> boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
> boost::spirit::classic::end_parser>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::strlit<const char*>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::iteration_policy> >,
> boost::spirit::classic::match_policy,
> boost::spirit::classic::action_policy> >; ParserT =
> boost::spirit::classic::difference<boost::spirit::classic::difference<boost::spirit::classic::anychar_parser,
> boost::spirit::classic::strlit<const char*> >,
> boost::spirit::classic::strlit<const char*> >; ActionT =
> boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
> std::basic_string<char> > >::a_char; typename
> boost::spirit::classic::parser_result<boost::spirit::classic::action<ParserT,
> ActionT>, ScannerT>::type =
> boost::spirit::classic::match<boost::spirit::classic::nil_t>]'
> boost/spirit/home/classic/core/composite/alternative.hpp:67:59:
> required from 'typename
> boost::spirit::classic::parser_result<boost::spirit::classic::alternative<A,
> B>, ScannerT>::type boost::spirit::classic::alternative<A,
> B>::parse(const ScannerT&) const [with ScannerT =
> boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
> std::vector<char, std::allocator<char> > >,
> boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
> boost::spirit::classic::end_parser>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::strlit<const char*>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::iteration_policy> >,
> boost::spirit::classic::match_policy,
> boost::spirit::classic::action_policy> >; A =
> boost::spirit::classic::action<boost::spirit::classic::difference<boost::spirit::classic::difference<boost::spirit::classic::anychar_parser,
> boost::spirit::classic::strlit<const char*> >,
> boost::spirit::classic::strlit<const char*> >,
> boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
> std::basic_string<char> > >::a_char>; B =
> boost::spirit::classic::sequence<boost::spirit::classic::chlit<char>,
> boost::spirit::classic::assertive_parser<std::basic_string<char>,
> boost::spirit::classic::rule<boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
> std::vector<char, std::allocator<char> > >,
> boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
> boost::spirit::classic::end_parser>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::strlit<const char*>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::iteration_policy> >,
> boost::spirit::classic::match_policy,
> boost::spirit::classic::action_policy> >, boost::spirit::classic::nil_t,
> boost::spirit::classic::nil_t> > >; typename
> boost::spirit::classic::parser_result<boost::spirit::classic::alternative<A,
> B>, ScannerT>::type =
> boost::spirit::classic::match<boost::spirit::classic::nil_t>]'
> boost/spirit/home/classic/core/non_terminal/impl/rule.ipp:240:36:
> required from 'typename boost::spirit::classic::match_result<ScannerT,
> ContextResultT>::type
> boost::spirit::classic::impl::concrete_parser<ParserT, ScannerT,
> AttrT>::do_parse_virtual(const ScannerT&) const [with ParserT =
> boost::spirit::classic::alternative<boost::spirit::classic::action<boost::spirit::classic::difference<boost::spirit::classic::difference<boost::spirit::classic::anychar_parser,
> boost::spirit::classic::strlit<const char*> >,
> boost::spirit::classic::strlit<const char*> >,
> boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
> std::basic_string<char> > >::a_char>,
> boost::spirit::classic::sequence<boost::spirit::classic::chlit<char>,
> boost::spirit::classic::assertive_parser<std::basic_string<char>,
> boost::spirit::classic::rule<boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
> std::vector<char, std::allocator<char> > >,
> boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
> boost::spirit::classic::end_parser>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::strlit<const char*>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::iteration_policy> >,
> boost::spirit::classic::match_policy,
> boost::spirit::classic::action_policy> >, boost::spirit::classic::nil_t,
> boost::spirit::classic::nil_t> > > >; ScannerT =
> boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
> std::vector<char, std::allocator<char> > >,
> boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
> boost::spirit::classic::end_parser>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
> char*>,
> boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
> boost::spirit::classic::strlit<const char*>,
> boost::spirit::classic::unary_parser_category,
> boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
> boost::spirit::classic::iteration_policy> >,
> boost::spirit::classic::match_policy,
> boost::spirit::classic::action_policy> >; AttrT =
> boost::spirit::classic::nil_t; typename
> boost::spirit::classic::match_result<ScannerT, ContextResultT>::type =
> boost::spirit::classic::match<boost::spirit::classic::nil_t>]'
> main.cpp:14:1:   required from here
> boost/property_tree/detail/json_parser_read.hpp:116:18: warning: unused
> parameter 'e' [-Wunused-parameter]
>
> 116: void operator()(It b, It e) const

New description:

 gcc version 4.7.2 (Built by MinGW-builds project) i686-w64-mingw32

 yields

 {{{
 /boost/property_tree/detail/json_parser_read.hpp: In instantiation of
 'void
 boost::property_tree::json_parser::context<Ptree>::a_char::operator()(boost::property_tree::json_parser::context<Ptree>::It,
 boost::property_tree::json_parser::context<Ptree>::It) const [with Ptree =
 boost::property_tree::basic_ptree<std::basic_string<char>,
 std::basic_string<char> >;
 boost::property_tree::json_parser::context<Ptree>::It =
 __gnu_cxx::__normal_iterator<char*, std::vector<char, std::allocator<char>
 > >]':
 boost/spirit/home/classic/core/scanner/scanner.hpp:148:13:   required from
 'static void
 boost::spirit::classic::attributed_action_policy<boost::spirit::classic::nil_t>::call(const
 ActorT&, boost::spirit::classic::nil_t, const IteratorT&, const
 IteratorT&) [with ActorT =
 boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
 std::basic_string<char> > >::a_char; IteratorT =
 __gnu_cxx::__normal_iterator<char*, std::vector<char, std::allocator<char>
 > >]'
 boost/spirit/home/classic/core/scanner/scanner.hpp:163:13:   required from
 'void boost::spirit::classic::action_policy::do_action(const ActorT&,
 AttrT&, const IteratorT&, const IteratorT&) const [with ActorT =
 boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
 std::basic_string<char> > >::a_char; AttrT =
 boost::spirit::classic::nil_t; IteratorT =
 __gnu_cxx::__normal_iterator<char*, std::vector<char, std::allocator<char>
 > >]'
 boost/spirit/home/classic/core/composite/actions.hpp:116:17:   required
 from 'typename
 boost::spirit::classic::parser_result<boost::spirit::classic::action<ParserT,
 ActionT>, ScannerT>::type boost::spirit::classic::action<ParserT,
 ActionT>::parse(const ScannerT&) const [with ScannerT =
 boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
 std::vector<char, std::allocator<char> > >,
 boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
 boost::spirit::classic::end_parser>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::strlit<const char*>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::iteration_policy> >,
 boost::spirit::classic::match_policy,
 boost::spirit::classic::action_policy> >; ParserT =
 boost::spirit::classic::difference<boost::spirit::classic::difference<boost::spirit::classic::anychar_parser,
 boost::spirit::classic::strlit<const char*> >,
 boost::spirit::classic::strlit<const char*> >; ActionT =
 boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
 std::basic_string<char> > >::a_char; typename
 boost::spirit::classic::parser_result<boost::spirit::classic::action<ParserT,
 ActionT>, ScannerT>::type =
 boost::spirit::classic::match<boost::spirit::classic::nil_t>]'
 boost/spirit/home/classic/core/composite/alternative.hpp:67:59:   required
 from 'typename
 boost::spirit::classic::parser_result<boost::spirit::classic::alternative<A,
 B>, ScannerT>::type boost::spirit::classic::alternative<A, B>::parse(const
 ScannerT&) const [with ScannerT =
 boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
 std::vector<char, std::allocator<char> > >,
 boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
 boost::spirit::classic::end_parser>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::strlit<const char*>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::iteration_policy> >,
 boost::spirit::classic::match_policy,
 boost::spirit::classic::action_policy> >; A =
 boost::spirit::classic::action<boost::spirit::classic::difference<boost::spirit::classic::difference<boost::spirit::classic::anychar_parser,
 boost::spirit::classic::strlit<const char*> >,
 boost::spirit::classic::strlit<const char*> >,
 boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
 std::basic_string<char> > >::a_char>; B =
 boost::spirit::classic::sequence<boost::spirit::classic::chlit<char>,
 boost::spirit::classic::assertive_parser<std::basic_string<char>,
 boost::spirit::classic::rule<boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
 std::vector<char, std::allocator<char> > >,
 boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
 boost::spirit::classic::end_parser>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::strlit<const char*>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::iteration_policy> >,
 boost::spirit::classic::match_policy,
 boost::spirit::classic::action_policy> >, boost::spirit::classic::nil_t,
 boost::spirit::classic::nil_t> > >; typename
 boost::spirit::classic::parser_result<boost::spirit::classic::alternative<A,
 B>, ScannerT>::type =
 boost::spirit::classic::match<boost::spirit::classic::nil_t>]'
 boost/spirit/home/classic/core/non_terminal/impl/rule.ipp:240:36:
 required from 'typename boost::spirit::classic::match_result<ScannerT,
 ContextResultT>::type
 boost::spirit::classic::impl::concrete_parser<ParserT, ScannerT,
 AttrT>::do_parse_virtual(const ScannerT&) const [with ParserT =
 boost::spirit::classic::alternative<boost::spirit::classic::action<boost::spirit::classic::difference<boost::spirit::classic::difference<boost::spirit::classic::anychar_parser,
 boost::spirit::classic::strlit<const char*> >,
 boost::spirit::classic::strlit<const char*> >,
 boost::property_tree::json_parser::context<boost::property_tree::basic_ptree<std::basic_string<char>,
 std::basic_string<char> > >::a_char>,
 boost::spirit::classic::sequence<boost::spirit::classic::chlit<char>,
 boost::spirit::classic::assertive_parser<std::basic_string<char>,
 boost::spirit::classic::rule<boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
 std::vector<char, std::allocator<char> > >,
 boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
 boost::spirit::classic::end_parser>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::strlit<const char*>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::iteration_policy> >,
 boost::spirit::classic::match_policy,
 boost::spirit::classic::action_policy> >, boost::spirit::classic::nil_t,
 boost::spirit::classic::nil_t> > > >; ScannerT =
 boost::spirit::classic::scanner<__gnu_cxx::__normal_iterator<char*,
 std::vector<char, std::allocator<char> > >,
 boost::spirit::classic::scanner_policies<boost::spirit::classic::no_skipper_iteration_policy<boost::spirit::classic::skip_parser_iteration_policy<boost::spirit::classic::alternative<boost::spirit::classic::alternative<boost::spirit::classic::space_parser,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::alternative<boost::spirit::classic::eol_parser,
 boost::spirit::classic::end_parser>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::confix_parser<boost::spirit::classic::strlit<const
 char*>,
 boost::spirit::classic::kleene_star<boost::spirit::classic::anychar_parser>,
 boost::spirit::classic::strlit<const char*>,
 boost::spirit::classic::unary_parser_category,
 boost::spirit::classic::non_nested, boost::spirit::classic::is_lexeme> >,
 boost::spirit::classic::iteration_policy> >,
 boost::spirit::classic::match_policy,
 boost::spirit::classic::action_policy> >; AttrT =
 boost::spirit::classic::nil_t; typename
 boost::spirit::classic::match_result<ScannerT, ContextResultT>::type =
 boost::spirit::classic::match<boost::spirit::classic::nil_t>]'
 main.cpp:14:1:   required from here
 boost/property_tree/detail/json_parser_read.hpp:116:18: warning: unused
 parameter 'e' [-Wunused-parameter]
 116: void operator()(It b, It e) const
 }}}

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