2 * Copyright (c) 2012, 2013 Spectra Logic Corporation
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions, and the following disclaimer,
10 * without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 * substantially similar to the "NO WARRANTY" disclaimer below
13 * ("Disclaimer") and any redistribution must be conditioned upon
14 * including a substantially similar Disclaimer requirement for further
15 * binary redistribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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30 * Authors: Alan Somers (Spectra Logic Corporation)
36 * \file devdctl_guid.h
38 * Definition of the Guid class.
40 #ifndef _DEVDCTL_GUID_H_
41 #define _DEVDCTL_GUID_H_
43 /*============================ Namespace Control =============================*/
47 /*============================= Class Definitions ============================*/
48 /*----------------------------------- Guid -----------------------------------*/
50 * \brief Object that represents guids.
52 * It can generally be manipulated as a uint64_t, but with a special
53 * value INVALID_GUID that does not equal any valid guid.
55 * As of this writing, this class is only used to represent ZFS
56 * guids in events and spa_generate_guid() in spa_misc.c explicitly
57 * refuses to return a guid of 0. So this class uses 0 as the value
58 * for INVALID_GUID. In the future, if 0 is allowed to be a valid
59 * guid, the implementation of this class must change.
65 /* Default constructor: an Invalid guid */
67 /* Construct a guid from a provided integer */
69 /* Construct a guid from a string in base 8, 10, or 16 */
70 Guid(const std::string &guid);
71 static Guid InvalidGuid();
73 /* Test the validity of this guid. */
76 /* Comparison to other Guid operators */
77 bool operator==(const Guid& rhs) const;
78 bool operator!=(const Guid& rhs) const;
80 /* Integer conversion operators */
81 operator uint64_t() const;
82 operator bool() const;
85 static const uint64_t INVALID_GUID = 0;
87 /* The integer value of the GUID. */
91 //- Guid Inline Public Methods ------------------------------------------------
94 : m_GUID(INVALID_GUID)
99 Guid::Guid(uint64_t guid)
107 return (Guid(INVALID_GUID));
111 Guid::IsValid() const
113 return (m_GUID != INVALID_GUID);
117 Guid::operator==(const Guid& rhs) const
119 return (m_GUID == rhs.m_GUID);
123 Guid::operator!=(const Guid& rhs) const
125 return (m_GUID != rhs.m_GUID);
129 Guid::operator uint64_t() const
135 Guid::operator bool() const
137 return (m_GUID != INVALID_GUID);
140 /** Convert the GUID into its string representation */
141 std::ostream& operator<< (std::ostream& out, Guid g);
143 } // namespace DevdCtl
144 #endif /* _DEVDCTL_GUID_H_ */