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LSST Data Management Base Package
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TriState.h
Go to the documentation of this file.
1/*
2 * This file is part of sphgeom.
3 *
4 * Developed for the LSST Data Management System.
5 * This product includes software developed by the LSST Project
6 * (http://www.lsst.org).
7 * See the COPYRIGHT file at the top-level directory of this distribution
8 * for details of code ownership.
9 *
10 * This software is dual licensed under the GNU General Public License and also
11 * under a 3-clause BSD license. Recipients may choose which of these licenses
12 * to use; please see the files gpl-3.0.txt and/or bsd_license.txt,
13 * respectively. If you choose the GPL option then the following text applies
14 * (but note that there is still no warranty even if you opt for BSD instead):
15 *
16 * This program is free software: you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation, either version 3 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 */
29
30#ifndef LSST_SPHGEOM_TRISTATE_H_
31#define LSST_SPHGEOM_TRISTATE_H_
32
35
36#include <iostream>
37#include <stdexcept>
38
39
40namespace lsst {
41namespace sphgeom {
42
46class TriState {
47public:
50
52 explicit TriState(bool value) : _known(true), _value(value) {}
53
54 TriState& operator=(TriState const & other) = default;
55
60 bool operator==(TriState const & other) const {
61 if (not _known) {
62 return not other._known;
63 } else {
64 return other._known && _value == other._value;
65 }
66 }
67
68 bool operator!=(TriState const & other) const {
69 return not this->operator==(other);
70 }
71
75 bool operator==(bool value) const {
76 return _known && _value == value;
77 }
78
79 bool operator!=(bool value) const {
80 return not this->operator==(value);
81 }
82
87 TriState operator|(TriState const & other) const {
88 if (*this == true || other == true) {
89 return TriState(true);
90 } else if (*this == false && other == false) {
91 return TriState(false);
92 } else {
93 return TriState();
94 }
95 }
96
101 TriState operator&(TriState const & other) const {
102 if (*this == false || other == false) {
103 return TriState(false);
104 } else if (*this == true && other == true) {
105 return TriState(true);
106 } else {
107 return TriState();
108 }
109 }
110
115 if (known()) {
116 return TriState(!_value);
117 }
118 return TriState();
119 }
120
123 bool known() const { return _known; }
124
125private:
126 bool _known = false;
127 bool _value = false;
128};
129
130inline
131std::ostream & operator<<(std::ostream & stream, TriState const & value) {
132 const char* str = "unknown";
133 if (value == true) {
134 str = "true";
135 } else if (value == false) {
136 str = "false";
137 }
138 return stream << str;
139}
140
141}} // namespace lsst::sphgeom
142
143#endif // LSST_SPHGEOM_TRISTATE_H_
TriState represents a boolean value with additional unknown state.
Definition TriState.h:46
bool operator==(bool value) const
Compare this tri-state value with a boolean.
Definition TriState.h:75
TriState operator~() const
Compute the logical NOT of a TriState value.
Definition TriState.h:114
bool known() const
Check whether the state is known.
Definition TriState.h:123
TriState & operator=(TriState const &other)=default
bool operator!=(bool value) const
Definition TriState.h:79
TriState(bool value)
Construct value in a known state.
Definition TriState.h:52
TriState operator&(TriState const &other) const
Compute the logical AND of two TriState values.
Definition TriState.h:101
TriState()
Construct value in unknown state.
Definition TriState.h:49
bool operator==(TriState const &other) const
Compare this tri-state value with other tri-state value.
Definition TriState.h:60
bool operator!=(TriState const &other) const
Definition TriState.h:68
TriState operator|(TriState const &other) const
Compute the logical OR of two TriState values.
Definition TriState.h:87
std::ostream & operator<<(std::ostream &, Angle const &)
Definition Angle.cc:41