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* c++/10841: rejects valid explicit conversion to/from pointers-to-member of private base
@ 2003-05-18 5:16 sbeasley
0 siblings, 0 replies; only message in thread
From: sbeasley @ 2003-05-18 5:16 UTC (permalink / raw)
To: gcc-gnats
>Number: 10841
>Category: c++
>Synopsis: rejects valid explicit conversion to/from pointers-to-member of private base
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: unassigned
>State: open
>Class: rejects-legal
>Submitter-Id: net
>Arrival-Date: Sun May 18 05:16:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Shane Beasley
>Release: gcc version 3.3 20030415 (Debian prerelease)
>Organization:
>Environment:
Linux v2.4.19 (Debian) on Intel x86-compatible
>Description:
Section 5.4, paragraph 7, of ISO/IEC 14882:1998 (ISO C++) allows C-style cast notation to convert a pointer-to-member of a derived class to a pointer-to-member of a unambiguous non-virtual base class or vice versa, regardless of the accessibility of the base class.
GCC 3.3 emits the following diagnostic:
<stdin>: In function `int main()':
<stdin>:9: error: `main()::Base' is an inaccessible base of `main()::Derived'
<stdin>:10: error: `main()::Base' is an inaccessible base of `main()::Derived'
>How-To-Repeat:
int main () {
class Base { public: int i, j, k; };
class Derived : private Base { public: int m, n, p; };
Derived derived;
Base &base = (Base &)derived;
// neither line compiles; 5.4p7 allows both
base.*((int Base::*)&Derived::n) = 0xdeadbeef;
derived.*((int Derived::*)&Base::j) = 0xc0decafe;
}
>Fix:
Do not check for accessibility of the base class if C-style cast notation is used.
>Release-Note:
>Audit-Trail:
>Unformatted:
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2003-05-18 5:16 c++/10841: rejects valid explicit conversion to/from pointers-to-member of private base sbeasley
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