why using ... unused in BOOST_SPIRIT_DEFINE_ macro

Larry Evans <[email protected]> Sun, 31 Jul 2016 15:23:38 -0500
Newsgroups gmane.comp.parsers.spirit.devel
Message-ID <[email protected]>
Because unused appears nowhere else in the function body,
I was wondering What's the purpose of:

https://github.com/boostorg/spirit/blob/develop/include/boost/spirit/home/x3/nonterminal/rule.hpp#L163

?


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