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Subject: [Bug c++/55942] New: [C++11] sorry, unimplemented: calling a member function of the object being constructed in a constant expression
Date: Fri, 11 Jan 2013 14:43:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55942

             Bug #: 55942
           Summary: [C++11] sorry, unimplemented: calling a member
                    function of the object being constructed in a constant
                    expression
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: FIXME
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: redi@gcc.gnu.org


struct A
{
    constexpr explicit A(bool b) : o{flip(b)} { }

    constexpr bool flip(bool b) { return !b; }

    bool o;
};

ce.cc: In constructor 'constexpr A::A(bool)':
ce.cc:3:49: sorry, unimplemented: calling a member function of the object being
constructed in a constant expression
     constexpr explicit A(bool b) : o{flip(b)} { }
                                                 ^

I found this by accident because I meant to define A::flip as a static member
function, which would have worked. Omitting the static gives the "sorry" above.