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Diffstat (limited to '')
-rw-r--r-- | src/include/alloc_ptr.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/src/include/alloc_ptr.h b/src/include/alloc_ptr.h new file mode 100644 index 00000000..258c5833 --- /dev/null +++ b/src/include/alloc_ptr.h @@ -0,0 +1,91 @@ +// -*- 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 |