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[Bug c++/71658] New: User-defined conversion operator from a wrapper class to the wrapped type does not compile.


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71658

            Bug ID: 71658
           Summary: User-defined conversion operator from a wrapper class
                    to the wrapped type does not compile.
           Product: gcc
           Version: 4.8.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ulrichmutze at gmx dot de
  Target Milestone: ---

Created attachment 38769
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38769&action=edit
This single self-contained source file should compile according to what the
standard sys about user-defined conversion operators. It doesn't.

Please see the heading comment section of the attached self-contained
source file main.cpp. I hope that it contains all info you are looking for.

John Maddock from the boost project to whom I reported the problem in a form
closer to the my actual application, and assuming that it would be caused
by boost/multiprecision classes, found the problem 'perplexing' and came
to the conclusion that it has probably not to do with multiprecision.
So, I simplified the the problem to the lowest level which is presented here.

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