Gcc's friend-mechanism seems to expand to nested classes as well, although
the C++ standard explicitly tells differently.
The following example is almost straight from the C++ standard (11.4/2). The
only change is that inheritance is commented out for class X (in order to
remove the first error in the example). Gcc compiles this with no error
messages, even with -Wall -pedantic
// test.cc
class A {
class B { };
friend class X;
};
// INHERITANCE BELOW COMMENTED OUT BY ME
class X /* : A::B */ { // ill-formed: A::B cannot be accessed
// in the base-clause for X
A::B mx; // OK: A::B used to declare member of X
class Y : A::B { // OK: A::B used to declare member of X
// !!!!!!!!!!! The illegal line below compiles fine !!!!!!!!!!
A::B my; // ill-formed: A::B cannot be accessed
// to declare members of nested class of X
};
};
Environment:
System: Linux mustikkakukko 2.6.18.8-0.3-default #1 SMP Tue Apr 17 08:42:35 UTC
2007 x86_64 x86_64 x86_64 GNU/Linux
Architecture: x86_64
host: x86_64-suse-linux-gnu
build: x86_64-suse-linux-gnu
target: x86_64-suse-linux-gnu
configured with: ../gcc-4.2.1/configure --prefix=/usr/local/gcc-4.2.1
--bindir=/usr/local/gcc-4.2.1/bin64 --enable-languages=c,c++
--enable-__cxa_atexit --host=x86_64-suse-linux --with-arch=nocona
--with-tune=nocona
How-To-Repeat:
g++ -W -Wall -pedantic -c test.cc
(No errors result in compilation.)
--
Summary: C++: Invalid interpretation of friendness with nested
classes
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bitti at iki dot fi
GCC build triplet: x86_64-suse-linux-gnu
GCC host triplet: x86_64-suse-linux-gnu
GCC target triplet: x86_64-suse-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33468
