c++/9061: Improper access granted to protected typedef from nested member of derived class

[chris at pennasoft dot com]

>Number:         9061
>Category:       c++
>Synopsis:       Improper access granted to protected typedef from nested member of derived class
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Dec 26 12:46:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     chris@pennasoft.com
>Release:        2.95.4
>Organization:
>Environment:
FreeBSD topperwein.pennasoft.com 4.7-STABLE FreeBSD 4.7-STABLE #0: Wed Dec  4 15:59:17 EST 2002     behanna@topperwein.pennasoft.com:/raid0/stable/usr/obj/raid0/stable/usr/src/sys/TOPPERWEIN  i386
>Description:
Consider the following:

class Parent {
protected:
    typedef int MyInt;
};

class Child: public Parent {
protected:
    class Nested {
    public:
        inline MyInt myfunc() { return 0; }
    };
};

class Nested is not a derived class of class Parent, and thus should not have access to any protected members of class Parent, per the 1997 C++ draft standard, section 11.8, paragraph 1 (see http://anubis.dkuug.dk/jtc1/sc22/open/n2356/access.html ).

g++ version 2.95.4 allows the above construct.  By way of contrast, Sun's Forté C++ compiler, version 6.2, does not, and issues the complaint:

"prot.C", line 10: Error: Parent::MyInt is not accessible from Child::Nested.
1 Error(s) detected.
>How-To-Repeat:
Save the code example as prot.C and compile it as follows:

g++ -c prot.C
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: