[Bug c++/15797] New: static_casts of objects on stack only point to copy of object

[Bug c++/15797] New: static_casts of objects on stack only point to copy of object

[loeffel77 at yahoo dot com]

#include <iostream>
using namespace std;
 
class base
{
  public:
    int val1;
    base():val1(10)
     {cout << "Where: "<< this << endl;}
};
 
 
class child: public base
{ public:
    int val2;
    child():val2(20)
     {cout <<  "Where: "<< this <<  endl;}
};
 
 
 
int main(void)
{
 
  child myclass;
 
 
  cout << "Where child:             " << &myclass << endl;
  cout << "Where static_cast< base> " << &(static_cast<base> (myclass)) << endl;
 
  cout << "=================="<< endl;
  cout << "Changing val1 to 11" << endl;
 
  static_cast<base>(myclass).val1=11;                   // This should change
myclass.val1;
 
  cout << "val1 in child: " << myclass.val1 << endl;   // But does not work
  cout << "val1 in base:  " << static_cast<base>(myclass).val1 << endl;
 
 
  return 0;
}

-- 
           Summary: static_casts of objects on stack only point to copy of
                    object
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: loeffel77 at yahoo dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15797

[Bug c++/15797] static_casts of objects on stack only point to copy of object

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-06-03 18:30 -------
You need to cast to a reference to the base class instead. 
W. 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15797