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From: "ville.voutilainen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51851] New: Overriding a function with a parameter of dependent type fails to override.
Date: Fri, 13 Jan 2012 19:13:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51851

             Bug #: 51851
           Summary: Overriding a function with a parameter of dependent
                    type fails to override.
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ville.voutilainen@gmail.com


Test snippet:

template<class T>
struct A
{
       typedef double Point[2];
       virtual double calculate(const Point point) const =3D 0;
};

template<class T>
struct B : public A<T>
{
       virtual double calculate(const typename A<T>::Point point) const
       {
               return point[0];
       }
};

int main()
{
       B<int> b;
       return 0;
}

gcc says
ville.cpp: In function =E2=80=98int main()=E2=80=99:
ville.cpp:19:16: error: cannot declare variable =E2=80=98b=E2=80=99 to be o=
f abstract type
=E2=80=98B<int>=E2=80=99
ville.cpp:9:8: note:   because the following virtual functions are pure wit=
hin
=E2=80=98B<int>=E2=80=99:
ville.cpp:5:24: note:     double A<T>::calculate(const double*) const [with=
 T =3D
int]