[Bug c++/40828] New: Rejected valid specialization of member class template

[Bug c++/40828] New: Rejected valid specialization of member class template

[andhow at gmail dot com]

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This is similar to bug 14494.  The following member code is rejected:

template <class T>
class Outer {
    template <class U> class Inner {};
};

template <class T>
template <>
class Outer<T>::Inner<int> {};  /* error */

with error:

test.cpp:7: error: invalid explicit specialization before ‘>’ token
test.cpp:7: error: enclosing class templates are not explicitly specialized
test.cpp:8: error: template parameters not used in partial specialization:
test.cpp:8: error:         ‘T’

Of interest, the following partial specialization compiles:

template <class T>
class Outer {
    template <class U> class Inner {};
};

template <class T>
template <class U>
class Outer<T>::Inner<U *> {};


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           Summary: Rejected valid specialization of member class template
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: andhow at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40828

[Bug c++/40828] Rejected valid specialization of member class template

[jwakely dot gcc at gmail dot com]

------- Comment #1 from jwakely dot gcc at gmail dot com  2009-07-23 14:06 -------
The code is invalid.  This is allowed:

template <>
template <class T>
class Outer<int>::Inner<T> {};

but not the other way around.  The diagnostic is correct to say "enclosing
class templates are not explicitly specialized"

See the last specialisation in the example following 14.7.3 [temp.expl.spec]
paragraph 18


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40828

[Bug c++/40828] Rejected valid specialization of member class template

[paolo dot carlini at oracle dot com]

------- Comment #2 from paolo dot carlini at oracle dot com  2009-07-23 15:06 -------
Thanks Jon.


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paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40828

[Bug c++/40828] Rejected valid specialization of member class template

[andhow at gmail dot com]

------- Comment #3 from andhow at gmail dot com  2009-07-23 16:31 -------
That is very strange indeed; sorry for the mistake!


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40828