my_auto_ptr.h

// -*- C++ -*-
/***************************************************************************
 *
 * The IPPL Framework
 *
 *
 * Visit http://people.web.psi.ch/adelmann/ for more details
 *
 ***************************************************************************/
 
#ifndef MY_AUTO_PTR_H
#define MY_AUTO_PTR_H
 
/*
  A simple compliant implementation of auto_ptr.
  This is from Greg Colvin's implementation posted to comp.std.c++.
 
  Instead of using mutable this casts away const in release.
 
  We have to do this because we can't build containers of these
  things otherwise.
  */
 
template <class X>
class my_auto_ptr {
    X* px;
 
public:
    my_auto_ptr()
        : px(0) {}
    my_auto_ptr(X* p)
        : px(p) {}
    my_auto_ptr(const my_auto_ptr<X>& r)
        : px(r.release()) {}
    my_auto_ptr& operator=(const my_auto_ptr<X>& r) {
        if (&r != this) {
            delete px;
            px = r.release();
        }
        return *this;
    }
    ~my_auto_ptr() { delete px; }
    X& operator*() const { return *px; }
    X* operator->() const { return px; }
    X* get() const { return px; }
    X* release() const {
        X* p                          = px;
        ((my_auto_ptr<X>*)(this))->px = 0;
        return p;
    }
};
 
#endif  // MY_AUTO_PTR_H