Abseil Common Libraries (C++) (grcp 依赖)
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84 lines
3.2 KiB
84 lines
3.2 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#ifndef ABSL_BASE_INTERNAL_LOG_SEVERITY_H_ |
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#define ABSL_BASE_INTERNAL_LOG_SEVERITY_H_ |
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#include <array> |
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#include <ostream> |
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#include "absl/base/attributes.h" |
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namespace absl { |
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// Four severity levels are defined. Logging APIs should terminate the program |
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// when a message is logged at severity `kFatal`; the other levels have no |
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// special semantics. |
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// |
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// Abseil flags may be defined with type `LogSeverity`. Dependency layering |
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// constraints require that the `AbslParseFlag` overload be declared and defined |
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// in the flags module rather than here. The `AbslUnparseFlag` overload is |
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// defined there too for consistency. |
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// |
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// The parser accepts arbitrary integers (as if the type were `int`). It also |
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// accepts each named enumerator, without regard for case, with or without the |
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// leading 'k'. For example: "kInfo", "INFO", and "info" all parse to the value |
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// `absl::LogSeverity::kInfo`. |
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// |
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// Unparsing a flag produces the same result as `absl::LogSeverityName()` for |
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// the standard levels and a base-ten integer otherwise. |
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enum class LogSeverity : int { |
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kInfo = 0, |
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kWarning = 1, |
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kError = 2, |
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kFatal = 3, |
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}; |
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// Returns an iterable of all standard `absl::LogSeverity` values, ordered from |
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// least to most severe. |
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constexpr std::array<absl::LogSeverity, 4> LogSeverities() { |
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return {{absl::LogSeverity::kInfo, absl::LogSeverity::kWarning, |
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absl::LogSeverity::kError, absl::LogSeverity::kFatal}}; |
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} |
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// Returns the all-caps string representation (e.g. "INFO") of the specified |
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// severity level if it is one of the standard levels and "UNKNOWN" otherwise. |
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constexpr const char* LogSeverityName(absl::LogSeverity s) { |
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return s == absl::LogSeverity::kInfo |
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? "INFO" |
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: s == absl::LogSeverity::kWarning |
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? "WARNING" |
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: s == absl::LogSeverity::kError |
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? "ERROR" |
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: s == absl::LogSeverity::kFatal ? "FATAL" : "UNKNOWN"; |
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} |
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// Values less than `kInfo` normalize to `kInfo`; values greater than `kFatal` |
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// normalize to `kError` (**NOT** `kFatal`). |
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constexpr absl::LogSeverity NormalizeLogSeverity(absl::LogSeverity s) { |
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return s < absl::LogSeverity::kInfo |
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? absl::LogSeverity::kInfo |
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: s > absl::LogSeverity::kFatal ? absl::LogSeverity::kError : s; |
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} |
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constexpr absl::LogSeverity NormalizeLogSeverity(int s) { |
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return absl::NormalizeLogSeverity(static_cast<absl::LogSeverity>(s)); |
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} |
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// The exact representation of a streamed `absl::LogSeverity` is deliberately |
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// unspecified; do not rely on it. |
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std::ostream& operator<<(std::ostream& os, absl::LogSeverity s); |
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} // namespace absl |
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#endif // ABSL_BASE_INTERNAL_LOG_SEVERITY_H_
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