booster/clone_ptr.h

//
//  Copyright (C) 2009-2012 Artyom Beilis (Tonkikh)
//
//  Distributed under the Boost Software License, Version 1.0. (See
//  accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOSTER_CLONE_PTR_H
#define BOOSTER_CLONE_PTR_H

namespace booster {
        
        template<typename T>
        class clone_ptr {
                T *ptr_;
        public:
                clone_ptr() : ptr_(0) {}
                explicit clone_ptr(T *v) : ptr_(v) {}
                clone_ptr(clone_ptr const &other) : ptr_(0)
                {
                        if(other.ptr_)
                                ptr_=other.ptr_->clone();
                }
                clone_ptr const &operator=(clone_ptr const &other)
                {
                        if(this != &other) {
                                clone_ptr tmp(other);
                                swap(tmp);
                        }
                        return *this;
                }
                ~clone_ptr() {
                        if(ptr_) delete ptr_;
                }

                T *get() const { return ptr_; }
                T &operator *() const { return *ptr_; }
                T *operator->() const { return ptr_; }

                T *release() { T *tmp=ptr_; ptr_=0; return tmp; }
                void reset(T *p=0)
                {
                        if(ptr_) delete ptr_;
                        ptr_=p;
                }
                void swap(clone_ptr &other)
                {
                        T *tmp=other.ptr_;
                        other.ptr_=ptr_;
                        ptr_=tmp;
                }
        };

} // booster

#endif