http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50372
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: unassig...@gcc.gnu.org
ReportedBy: l...@mit.edu
Created attachment 25253
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25253
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 with
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 ‘void test()’:
foo.cc:8:21: error: ‘static_func’ is not a valid template argument for type
‘void (*)()’ because function ‘void static_func()’ has not external linkage
foo.cc:8:21: error: no matching function for call to ‘foo()’
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=gnu++0x. Tested on 4.6.0 and trunk r178795.
AFAICT the error is correct in c++98 mode.
