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[Bug c++/17177] New: Can not explicitly call protected superclass constructor in method
- From: "jjamison at cs dot berkeley dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 Aug 2004 20:45:46 -0000
- Subject: [Bug c++/17177] New: Can not explicitly call protected superclass constructor in method
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
[jjamison@aspen ~/harmonia/src-main]$ /usr/misc/pkg/gcc-3.4.1/bin/gcc -Wall
/tmp/foo.cc
/tmp/foo.cc: In member function `C D::m()':
/tmp/foo.cc:3: error: `C::C(int)' is protected
/tmp/foo.cc:12: error: within this context
[jjamison@aspen ~/harmonia/src-main]$ /usr/misc/pkg/gcc-3.4.1/bin/gcc -v
Reading specs from
/.automount/project.EECS.Berkeley.EDU/vol/vol0/graham/b/sggs/local/x86-unknown-linux/pkg/gcc-3.4.1/bin/../lib/gcc/i686-pc-linux-gnu/3.4.1/specs
Configured with: ../gcc-3.4.1/configure --prefix=/usr/misc/pkg/gcc-3.4.1
--with-gnu-as --with-as=/usr/misc/bin/as --with-gnu-ld
--with-ld=/usr/misc/bin/ld --enable-threads --enable-languages=c,c++
Thread model: posix
gcc version 3.4.1
[jjamison@aspen ~/harmonia/src-main]$ uname -a
Linux aspen.CS.Berkeley.EDU 2.4.22-1.2188.nptl #1 Wed Apr 21 20:36:05 EDT 2004
i686 i686 i386 GNU/Linux
--------foo.cc--------
class C {
protected:
C(int) {}
void n() {}
public:
C() {}
C m() { n(); return C(3); }
};
class D : public C {
D() : C() {}
public:
C m() { n(); return C(3); }
};
int main(void) {
return 0;
}
------end foo.cc------
In D::m(), I call C::C(int). C::C(int) is a protected member of the superclass.
g++ does not allow me to call it. However, I can call C::n(), which is also a
protected member of the superclass. Futhermore, calling either of these in C is
fine, as evidenced by C::m().
Is there a special rule that says you can only call protected superclass
constructors from a constructor? I could not find any documentation that said
that, but I may have missed it.
--
Summary: Can not explicitly call protected superclass constructor
in method
Product: gcc
Version: 3.4.1
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jjamison at cs dot berkeley dot edu
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: x86-unknown-linux
GCC host triplet: x86-unknown-linux
GCC target triplet: x86-unknown-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17177