/Users/deen/code/yugabyte-db/src/yb/util/trilean.h
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1 | | // Copyright (c) YugaByte, Inc. |
2 | | // |
3 | | // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
4 | | // in compliance with the License. You may obtain a copy of the License at |
5 | | // |
6 | | // http://www.apache.org/licenses/LICENSE-2.0 |
7 | | // |
8 | | // Unless required by applicable law or agreed to in writing, software distributed under the License |
9 | | // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
10 | | // or implied. See the License for the specific language governing permissions and limitations |
11 | | // under the License. |
12 | | // |
13 | | |
14 | | #ifndef YB_UTIL_TRILEAN_H_ |
15 | | #define YB_UTIL_TRILEAN_H_ |
16 | | |
17 | | #include <ostream> |
18 | | #include <string> |
19 | | |
20 | | namespace yb { |
21 | | |
22 | | // A "three-value boolean". We need this for some sanity checks. |
23 | | // https://en.wikipedia.org/wiki/Three-valued_logic |
24 | | enum class Trilean : uint8_t { |
25 | | kFalse = 0, |
26 | | kTrue = 1, |
27 | | kUnknown = 2 |
28 | | }; |
29 | | |
30 | | std::string TrileanToStr(Trilean value); |
31 | | |
32 | 0 | inline constexpr Trilean ToTrilean(bool b) noexcept { |
33 | 0 | return b ? Trilean::kTrue : Trilean::kFalse; |
34 | 0 | } |
35 | | |
36 | 0 | inline std::ostream& operator << (std::ostream& out, Trilean trilean) { |
37 | 0 | return out << TrileanToStr(trilean); |
38 | 0 | } |
39 | | |
40 | | } // namespace yb |
41 | | |
42 | | #endif // YB_UTIL_TRILEAN_H_ |