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143 lines
3.8 KiB
C++
143 lines
3.8 KiB
C++
/*-
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* Copyright (c) 2012, 2013 Spectra Logic Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*
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* Authors: Alan Somers (Spectra Logic Corporation)
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*/
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/**
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* \file devdctl_guid.h
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*
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* Definition of the Guid class.
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*/
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#ifndef _DEVDCTL_GUID_H_
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#define _DEVDCTL_GUID_H_
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/*============================ Namespace Control =============================*/
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namespace DevdCtl
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{
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/*============================= Class Definitions ============================*/
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/*----------------------------------- Guid -----------------------------------*/
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/**
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* \brief Object that represents guids.
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*
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* It can generally be manipulated as a uint64_t, but with a special
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* value INVALID_GUID that does not equal any valid guid.
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*
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* As of this writing, this class is only used to represent ZFS
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* guids in events and spa_generate_guid() in spa_misc.c explicitly
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* refuses to return a guid of 0. So this class uses 0 as the value
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* for INVALID_GUID. In the future, if 0 is allowed to be a valid
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* guid, the implementation of this class must change.
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*/
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class Guid
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{
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public:
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/* Constructors */
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/* Default constructor: an Invalid guid */
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Guid();
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/* Construct a guid from a provided integer */
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Guid(uint64_t guid);
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/* Construct a guid from a string in base 8, 10, or 16 */
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Guid(const std::string &guid);
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static Guid InvalidGuid();
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/* Test the validity of this guid. */
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bool IsValid() const;
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/* Comparison to other Guid operators */
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bool operator==(const Guid& rhs) const;
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bool operator!=(const Guid& rhs) const;
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/* Integer conversion operators */
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operator uint64_t() const;
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operator bool() const;
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protected:
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static const uint64_t INVALID_GUID = 0;
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/* The integer value of the GUID. */
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uint64_t m_GUID;
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};
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//- Guid Inline Public Methods ------------------------------------------------
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inline
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Guid::Guid()
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: m_GUID(INVALID_GUID)
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{
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}
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inline
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Guid::Guid(uint64_t guid)
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: m_GUID(guid)
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{
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}
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inline Guid
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Guid::InvalidGuid()
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{
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return (Guid(INVALID_GUID));
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}
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inline bool
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Guid::IsValid() const
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{
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return (m_GUID != INVALID_GUID);
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}
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inline bool
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Guid::operator==(const Guid& rhs) const
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{
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return (m_GUID == rhs.m_GUID);
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}
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inline bool
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Guid::operator!=(const Guid& rhs) const
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{
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return (m_GUID != rhs.m_GUID);
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}
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inline
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Guid::operator uint64_t() const
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{
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return (m_GUID);
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}
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inline
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Guid::operator bool() const
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{
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return (m_GUID != INVALID_GUID);
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}
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/** Convert the GUID into its string representation */
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std::ostream& operator<< (std::ostream& out, Guid g);
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} // namespace DevdCtl
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#endif /* _DEVDCTL_GUID_H_ */
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