[Boost-bugs] [Boost C++ Libraries] #10403: fusion make_map metafunction

Subject: [Boost-bugs] [Boost C++ Libraries] #10403: fusion make_map metafunction
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-08-26 10:34:33

#10403: fusion make_map metafunction
 Reporter: Wojciech Mamrak <wmamrak@…> | Owner: djowel
     Type: Bugs | Status: new
Milestone: To Be Determined | Component: fusion
  Version: Boost 1.56.0 | Severity: Problem
 Keywords: fusion make_map |

 It seems documentation is out-of-sync with implementation of fusion's
 make_map metafunction, and also the new implementation (using variadic
 templates) is inconsistent with previous ones.

 The docs [1] say:
 result_of::make_map<int, double, char, double>::type

 make_map is implemented as a metafunction class, i.e. it does not have a
 nested type typedef:
         template <typename ...Key>
         struct make_map
             template <typename ...T>
             struct apply
                 typedef map<
                       , typename detail::as_fusion_element<T>::type

 so the proper "call" would be:
 result_of::make_map<int, double>::apply<char, double>::type

 From this I conclude it is not only a documentation error, but also api
 breach. Presumably it got unnoticed since make_map function is not using
 make_map metafunction anymore (as opposed to what the docs claim [2]).



Ticket URL: <https://svn.boost.org/trac/boost/ticket/10403>
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