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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2017 Red Hat, Inc.
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_ALLOC_PTR_H
#define CEPH_ALLOC_PTR_H
#include <memory>
template <class T>
class alloc_ptr
{
public:
typedef typename std::pointer_traits< std::unique_ptr<T> >::pointer pointer;
typedef typename std::pointer_traits< std::unique_ptr<T> >::element_type element_type;
alloc_ptr() : ptr() {}
template<class U>
alloc_ptr(U&& u) : ptr(std::forward<U>(u)) {}
alloc_ptr(alloc_ptr<pointer>&& rhs) : ptr(std::move(rhs.ptr)) {}
alloc_ptr(const alloc_ptr<pointer>& rhs) = delete;
alloc_ptr& operator=(const alloc_ptr<pointer>&& rhs) {
ptr = rhs.ptr;
}
alloc_ptr& operator=(const alloc_ptr<pointer>& rhs) {
ptr = rhs.ptr;
}
void swap (alloc_ptr<pointer>& rhs) {
ptr.swap(rhs.ptr);
}
element_type* release() {
return ptr.release();
}
void reset(element_type *p = nullptr) {
ptr.reset(p);
}
element_type* get() const {
if (!ptr)
ptr.reset(new element_type);
return ptr.get();
}
element_type& operator*() const {
if (!ptr)
ptr.reset(new element_type);
return *ptr;
}
element_type* operator->() const {
if (!ptr)
ptr.reset(new element_type);
return ptr.get();
}
operator bool() const {
return !!ptr;
}
friend bool operator< (const alloc_ptr& lhs, const alloc_ptr& rhs) {
return std::less<element_type>(*lhs, *rhs);
}
friend bool operator<=(const alloc_ptr& lhs, const alloc_ptr& rhs) {
return std::less_equal<element_type>(*lhs, *rhs);
}
friend bool operator> (const alloc_ptr& lhs, const alloc_ptr& rhs) {
return std::greater<element_type>(*lhs, *rhs);
}
friend bool operator>=(const alloc_ptr& lhs, const alloc_ptr& rhs) {
return std::greater_equal<element_type>(*lhs, *rhs);
}
friend bool operator==(const alloc_ptr& lhs, const alloc_ptr& rhs) {
return *lhs == *rhs;
}
friend bool operator!=(const alloc_ptr& lhs, const alloc_ptr& rhs) {
return *lhs != *rhs;
}
private:
mutable std::unique_ptr<element_type> ptr;
};
#endif
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