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From: "luto at mit dot edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/50372] New: c++11: pointers to static functions should be valid template parameters
Date: Tue, 13 Sep 2011 03:13:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D50372

             Bug #: 50372
           Summary: c++11: pointers to static functions should be valid
                    template parameters
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: luto@mit.edu


Created attachment 25253
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=3D25253
Test case

In n3242 [temp.arg.nontype]:

A template-argument for a non-type, non-template template-parameter shall be
one of:
...
 - a constant expression (5.19) that designates the address of an object wi=
th
static storage duration and external or internal linkage or a function with
external *or internal* linkage, ...  [emphasis added]

Nonetheless, the attached test case fails to compile with:

foo.cc: In function =E2=80=98void test()=E2=80=99:
foo.cc:8:21: error: =E2=80=98static_func=E2=80=99 is not a valid template a=
rgument for type
=E2=80=98void (*)()=E2=80=99 because function =E2=80=98void static_func()=
=E2=80=99 has not external linkage
foo.cc:8:21: error: no matching function for call to =E2=80=98foo()=E2=80=99
foo.cc:8:21: note: candidate is:
foo.cc:2:6: note: template<void (* fptr)()> void foo()
foo.cc:2:6: note:   substitution of deduced template arguments resulted in
errors seen above

even with -std=3Dgnu++0x.  Tested on 4.6.0 and trunk r178795.

AFAICT the error is correct in c++98 mode.