trust-store: /build/trust-store-git/src/trust-store/include/core/trust/tagged_integer.h Source File

trust-store 2.0.0 Provides a common implementation of a trust store to be used by trusted helpers.

tagged_integer.h
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1 /*
2 * Copyright © 2014 Canonical Ltd.
3 *
4 * This program is free software: you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License version 3,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 * Authored by: Thomas Voß <thomas.voss@canonical.com>
17 */
18
19 #ifndef CORE_TRUST_TAGGED_INTEGER_H_
20 #define CORE_TRUST_TAGGED_INTEGER_H_
21
22 #include <cstdint>
23
24 #include <ostream>
25 #include <type_traits>
26
27 #include <sys/types.h>
28
29 namespace core
30 {
31 namespace trust
32 {
34 template<typename Tag, typename Integer>
35 struct TaggedInteger
36 {
38 static_assert(std::is_integral<Integer>::value, "Integer has to be an integral type");
39
41 typedef Tag TagType;
43 typedef Integer IntegerType;
44
46 TaggedInteger() : value{}
47 {
48 }
49
51 explicit TaggedInteger(Integer value) : value{value}
52 {
53 }
54
56 Integer value;
57 };
58
60 template<typename Tag, typename Integer>
61 inline bool operator==(const TaggedInteger<Tag, Integer>& lhs, const TaggedInteger<Tag, Integer>& rhs)
62 {
63 return lhs.value == rhs.value;
64 }
65
67 template<typename Tag, typename Integer>
68 inline bool operator!=(const TaggedInteger<Tag, Integer>& lhs, const TaggedInteger<Tag, Integer>& rhs)
69 {
70 return lhs.value != rhs.value;
71 }
72
74 template<typename Tag, typename Integer>
75 inline bool operator<(const TaggedInteger<Tag, Integer>& lhs, const TaggedInteger<Tag, Integer>& rhs)
76 {
77 return lhs.value < rhs.value;
78 }
79
81 template<typename Tag, typename Integer>
82 inline std::ostream& operator<<(std::ostream& out, const TaggedInteger<Tag, Integer>& ti)
83 {
84 return out << ti.value;
85 }
86
87 namespace tag
88 {
89 // Tags a group id
90 struct Gid {};
91 // Tags a process id
92 struct Pid {};
93 // Tags a user id
94 struct Uid {};
95 // Tags a service-specific feature
96 struct Feature {};
97 }
98
100 typedef TaggedInteger<tag::Gid, gid_t> Gid;
102 typedef TaggedInteger<tag::Pid, pid_t> Pid;
104 typedef TaggedInteger<tag::Uid, uid_t> Uid;
106 typedef TaggedInteger<tag::Feature, std::uint64_t> Feature;
107 }
108 }
109
110 #endif // CORE_TRUST_TAGGED_INTEGER_H_
core::trust::operator<
bool operator<(const TaggedInteger< Tag, Integer > &lhs, const TaggedInteger< Tag, Integer > &rhs)
Returns true iff the left-hand-side integer instance is smaller than the right-hand-side.
Definition: tagged_integer.h:75
core::trust::TaggedInteger
Helper structure for tagging integer types with certain semantics.
Definition: tagged_integer.h:36
core::trust::Uid
TaggedInteger< tag::Uid, uid_t > Uid
Our internal user id type.
Definition: tagged_integer.h:104
core::trust::tag::Gid
Definition: tagged_integer.h:90
core::trust::tag::Pid
Definition: tagged_integer.h:92
core::trust::tag::Uid
Definition: tagged_integer.h:94
core::trust::TaggedInteger::TaggedInteger
TaggedInteger(Integer value)
Construct an instance from an existing integer type.
Definition: tagged_integer.h:51
core::trust::operator<<
CORE_TRUST_DLL_PUBLIC std::ostream & operator<<(std::ostream &out, const Request::Answer &a)
operator << pretty prints answers to the provided output stream.
core
Definition: agent.h:29
core::trust::TaggedInteger::TagType
Tag TagType
We bail out if the Integral type is not an integral one.
Definition: tagged_integer.h:38
core::trust::operator!=
bool operator!=(const TaggedInteger< Tag, Integer > &lhs, const TaggedInteger< Tag, Integer > &rhs)
Returns true iff both tagged integer instances are not equal.
Definition: tagged_integer.h:68
core::trust::Pid
TaggedInteger< tag::Pid, pid_t > Pid
Our internal process id type.
Definition: tagged_integer.h:102
core::trust::TaggedInteger::IntegerType
Integer IntegerType
Stores the Integer type.
Definition: tagged_integer.h:43
core::trust::TaggedInteger::value
Integer value
The contained integer value.
Definition: tagged_integer.h:56
core::trust::operator==
CORE_TRUST_DLL_PUBLIC bool operator==(const Agent::RequestParameters &lhs, const Agent::RequestParameters &rhs)
Returns true iff lhs and rhs are equal.
core::trust::TaggedInteger::TaggedInteger
TaggedInteger()
Construct an instance with a default value.
Definition: tagged_integer.h:46
core::trust::Gid
TaggedInteger< tag::Gid, gid_t > Gid
Our internal group id type.
Definition: tagged_integer.h:100
core::trust::Feature
TaggedInteger< tag::Feature, std::uint64_t > Feature
Our internal service-feature type.
Definition: tagged_integer.h:106
core::trust::tag::Feature
Definition: tagged_integer.h:96