http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60611
Bug ID: 60611
Summary: friend function declaration rejected when the
namespace in which it is declared is not explicitely
specified in the declaration
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nicolas.bertolotti at mathworks dot fr
Created attachment 32419
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32419&action=edit
Source file to reproduce the issue
If you compile the following piece of code using g++ (4.7.2):
"
class class1;
namespace ns1 {
class class2;
class class3;
}
ns1::class3 *func(ns1::class2 * cfg, const class1 * def);
namespace ns1 {
class class4 {
#ifdef WORKAROUND
friend ns1::class3 *(::func)(ns1::class2 * cfg, const class1 * def);
#else
friend class3 *(::func)(class2 * cfg, const class1 * def);
#endif
};
}
" (also attached)
you get the following:
$ g++ -c test.cpp
test.cpp:17:25: error: ‘func’ is neither function nor member function; cannot
be declared friend
test.cpp:17:23: error: expected ‘;’ at end of member declaration
test.cpp:17:32: error: expected ‘)’ before ‘*’ token
Now, if you explicitely add the namespaces as they appear in the initial
declaration (add -DWORKAROUND), the compilation succeeds.
