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* c++/8500: c++ bug
@ 2002-11-08 2:46 Harald.Soleng
0 siblings, 0 replies; only message in thread
From: Harald.Soleng @ 2002-11-08 2:46 UTC (permalink / raw)
To: gcc-gnats
>Number: 8500
>Category: c++
>Synopsis: Allows cast to private base class
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: unassigned
>State: open
>Class: accepts-illegal
>Submitter-Id: net
>Arrival-Date: Fri Nov 08 02:46:03 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Harald H. Soleng
>Release: 3.1.1
>Organization:
Norwegian Computing Centre
>Environment:
System: SunOS lyra 5.8 Generic_108528-12 sun4u sparc SUNW,Sun-Fire-280R
Architecture: sun4
host: sparc-sun-solaris2.8
build: sparc-sun-solaris2.8
target: sparc-sun-solaris2.8
configured with: ./configure --prefix=/local/gcc3.1.1
>Description:
The compiler admits static_cast to convert from a derived class to
a private base class: See code below.
#include <iostream>
using namespace std;
class Base
{
public:
Base() : _data(999) {}
int Data() const {return _data;}
private:
int _data;
};
class Derived : private Base
{
public:
Derived () : Base() {}
};
int main(void) {
Derived* d1 = new Derived;
Base* b1 = (Base*) d1;
int i = b1->Data();
cout << "We got it: " << i << endl;
Base* b2 = static_cast<Base*>(d1);
int j = b2 -> Data();
cout << "We got it: " << j << endl;
}
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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