[llvm-bugs] [Bug 39871] New: std::tuple_size should be a struct

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39871

            Bug ID: 39871
           Summary: std::tuple_size should be a struct
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ag at arvid.io
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Currently `std::tuple_size` is declared as `class tuple_size`. According to the
C++ standard, `tuple_size` is a `struct`
(http://eel.is/c++draft/tuple.helper#lib:tuple_size). 

This creates portability problems between libcxx and libstdc++, which correctly
declares it as a `struct`. Currently using either will result in
`-Wmismatched-tags`.

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