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From: tilo@bernina.ethz.ch (Tilo Levante)
Newsgroups: comp.std.c++
Subject: Re: Calling constructors for parms passed by value
Message-ID: <1991Feb5.073657.6030@bernina.ethz.ch>
Date: 5 Feb 91 07:36:57 GMT
References: <631@necssd.NEC.COM>
Organization: Swiss Federal Institute of Technology (ETH), Zurich
Lines: 39

The g++, tc++, ... compilers are correct. You missed the
(default) copy constructor. If you write your program this way,
you will see it:

#include<stream.h>
class bug {
  public:
    bug() { cout << "in constructor\n"; }
    bug(const bug& a) { cout << "in copy constructor\n"; }
   ~bug() { cout << "in destructor\n";  }
};

foo(bug a, bug b)
{
    cout << "in foo\n";
}

main()
{
    bug a,b;
    foo(a,b);
}

The output is:

in constructor
in constructor
in copy constructor
in copy constructor
in foo
in destructor
in destructor
in destructor
in destructor

I assume that cfront has a bug in this case. It has to 
destruct the value parameters.

Tilo