Ambiguous call to overloaded function

Hello,

I am trying to stand some unit tests up around my X3 rules, but
getting errors doing so:

template<class Rule>
void VerifyRule(const std::string& s,  Rule& r, bool expected_match) {

    using namespace boost::spirit::x3;

    auto first_ = s.begin();
    auto last_ = s.end();

    >>> REQUIRE(phrase_parse(first_, last_, r, space) == expected_match); <<<
    REQUIRE(first_ == last_);
}

// ...

>>> REQUIRE_NOTHROW(VerifyRule("12345", Port, true)); <<<

// ...

#include <boost/spirit/home/x3.hpp>

namespace Kmsg {

    namespace IPv4 {

        using namespace boost::spirit;
        using namespace boost::spirit::x3;

        x3::rule<class Port, std::uint16_t> const Port = "Port";

        auto const Port_def = digit
            | (char_('1', '9') >> digit[repeat(1, 3)])
            | (char_('1', '5') >> digit[repeat(4)])
            | (char_('6') >> char_('0', '4') >> digit[repeat(3)])
            | ("65" >> char_('0', '4') >> digit[repeat(2)])
            | ("655" >> char_('0', '2') >> digit)
            | ("6553" >> char_('0', '5'))
            ;

        BOOST_SPIRIT_DEFINE(Port);
    }
}

And which errors are:

2>------ Build started: Project: Rfc3986_Uri_RegexSyntaxVerification,
Configuration: Debug x64 ------
2>  Rfc3986_Uri_BoostSpiritParsing.cpp
2>/path/to/boost-1.65.1\boost/spirit/home/x3/nonterminal/rule.hpp(113):
error C2668: 'Kmsg::IPv4::parse_rule': ambiguous call to overloaded
function
2>  G:\Source\Kingdom
Software\Kingdom.Messaging\Working\src\transports/boost/spirit/ipv4/port.hpp(25):
note: could be 'bool
Kmsg::IPv4::parse_rule<Iterator,Context,Attribute_>(const
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>,Iterator
&,const Iterator &,const Context &,Attribute &)' [found using
argument-dependent lookup]
2>          with
2>          [
2>
Iterator=std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,
2>
Context=boost::spirit::x3::context<boost::spirit::x3::skipper_tag,const
boost::spirit::x3::standard::space_type,boost::spirit::x3::unused_type>,
2>              Attribute_=const boost::spirit::x3::unused_type,
2>              Attribute=const boost::spirit::x3::unused_type
2>          ]
2>  /path/to/boost-1.65.1\boost/spirit/home/x3/nonterminal/rule.hpp(27):
note: or       'boost::spirit::x3::detail::default_parse_rule_result
boost::spirit::x3::parse_rule<Kmsg::IPv4::Port,uint16_t,Iterator,Context,Attribute_>(boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>,Iterator
&,const Iterator &,const Context &,ActualAttribute &)'
2>          with
2>          [
2>
Iterator=std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,
2>
Context=boost::spirit::x3::context<boost::spirit::x3::skipper_tag,const
boost::spirit::x3::standard::space_type,boost::spirit::x3::unused_type>,
2>              Attribute_=const boost::spirit::x3::unused_type,
2>              ActualAttribute=const boost::spirit::x3::unused_type
2>          ]
2>  /path/to/boost-1.65.1\boost/spirit/home/x3/nonterminal/rule.hpp(113):
note: while trying to match the argument list '(const
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>,
std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,
const std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,
const boost::spirit::x3::context<boost::spirit::x3::skipper_tag,const
Derived,boost::spirit::x3::unused_type>, const
boost::spirit::x3::unused_type)'
2>          with
2>          [
2>              Derived=boost::spirit::x3::standard::space_type
2>          ]
2>  /path/to/boost-1.65.1\boost/spirit/home/x3/core/parse.hpp(117):
note: see reference to function template instantiation 'bool
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>::parse<Iterator,boost::spirit::x3::context<boost::spirit::x3::skipper_tag,const
Derived,boost::spirit::x3::unused_type>,Attribute>(Iterator &,const
Iterator &,const Context &,boost::spirit::x3::unused_type,Attribute_
&) const' being compiled
2>          with
2>          [
2>
Iterator=std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,
2>              Derived=boost::spirit::x3::standard::space_type,
2>              Attribute=const boost::spirit::x3::unused_type,
2>
Context=boost::spirit::x3::context<boost::spirit::x3::skipper_tag,const
boost::spirit::x3::standard::space_type,boost::spirit::x3::unused_type>,
2>              Attribute_=const boost::spirit::x3::unused_type
2>          ]
2>  /path/to/boost-1.65.1\boost/spirit/home/x3/core/parse.hpp(117):
note: see reference to function template instantiation 'bool
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>::parse<Iterator,boost::spirit::x3::context<boost::spirit::x3::skipper_tag,const
Derived,boost::spirit::x3::unused_type>,Attribute>(Iterator &,const
Iterator &,const Context &,boost::spirit::x3::unused_type,Attribute_
&) const' being compiled
2>          with
2>          [
2>
Iterator=std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,
2>              Derived=boost::spirit::x3::standard::space_type,
2>              Attribute=const boost::spirit::x3::unused_type,
2>
Context=boost::spirit::x3::context<boost::spirit::x3::skipper_tag,const
boost::spirit::x3::standard::space_type,boost::spirit::x3::unused_type>,
2>              Attribute_=const boost::spirit::x3::unused_type
2>          ]
2>  /path/to/boost-1.65.1\boost/spirit/home/x3/core/parse.hpp(162):
note: see reference to function template instantiation 'bool
boost::spirit::x3::phrase_parse_main<Iterator,Parser,Skipper,const
boost::spirit::x3::unused_type>(Iterator &,Iterator,const Parser
&,const Skipper &,Attribute &,boost::spirit::x3::skip_flag)' being
compiled
2>          with
2>          [
2>
Iterator=std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,
2>              Parser=const
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>,
2>              Skipper=boost::spirit::x3::standard::space_type,
2>              Attribute=const boost::spirit::x3::unused_type
2>          ]
2>  /path/to/tests/rfc\Rfc3986_Uri_BoostSpiritParsing.cpp(44): note:
see reference to function template instantiation 'bool
boost::spirit::x3::phrase_parse<std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,const
Rule,boost::spirit::x3::standard::space_type>(Iterator
&,Iterator,const Parser &,const Skipper
&,boost::spirit::x3::skip_flag)' being compiled
2>          with
2>          [
2>              Rule=const
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>,
2>
Iterator=std::_String_const_iterator<std::_String_val<std::_Simple_types<char>>>,
2>              Parser=const
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>,
2>              Skipper=boost::spirit::x3::standard::space_type
2>          ]
2>  /path/to/tests/rfc\Rfc3986_Uri_BoostSpiritParsing.cpp(52): note:
see reference to function template instantiation 'void
Kmsg::VerifyRule<Rule>(const std::string &,Rule &,bool)' being
compiled
2>          with
2>          [
2>              Rule=const
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>
2>          ]
2>  /path/to/tests/rfc\Rfc3986_Uri_BoostSpiritParsing.cpp(330): note:
see reference to function template instantiation 'void
Kmsg::VerifyPort<const
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>>(const
int32_t,Rule &,bool)' being compiled
2>          with
2>          [
2>              Rule=const
boost::spirit::x3::rule<Kmsg::IPv4::Port,uint16_t,false>
2>          ]
========== Build: 1 succeeded, 1 failed, 2 up-to-date, 0 skipped ==========


Cheers,

Michael Powell

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