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From: kent@humu.nosc.mil (Kent K. Kuriyama)
Newsgroups: comp.lang.c++
Subject: Incorrect handling of destructors in Turbo C++
Keywords: Turbo C++, destructors
Message-ID: <546@humu.NOSC.Mil>
Date: 24 Mar 91 23:08:12 GMT
Sender: kent@humu.NOSC.Mil
Organization: Naval Ocean Systems Center, Hawaii Laboratory
Lines: 57

There seems to be a bug in the code that Turbo C++ 1.00 generates.
In the following program the destructor routine should only be called
once.

------------
# include <stdio.h>

class A {
  protected:
    int i;
  public:
    A();
    ~A();
};

A::A()
{
  printf("Constructor called\n");
}

A::~A()
{
  printf("Destructor called\n");
}

void sub(A a)
{
  printf("in sub\n");
}

void main()
{
  A a;

  printf("before call\n");
  sub(a);
  printf("after call\n");
}
------------

When this program is executed:

------------
Constructor called
before call
in sub
after call
Destructor called
Destructor called
------------

Am I wrong to think that the destructor should only be called once?

Kent Kuriyama                          Voice (808) 257-1618
Naval Ocean Systems Center             FAX   (808) 257-1685
Hawaii Laboratory                      Box 997, Code 531   
kent@nosc.mil                          Kailua, HI   96734