Abseil Common Libraries (C++) (grcp 依赖)
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68 lines
2.4 KiB
68 lines
2.4 KiB
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// Copyright 2019 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_FLAGS_INTERNAL_COMMANDLINEFLAG_H_ |
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#define ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_ |
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#include "absl/base/config.h" |
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#include "absl/base/internal/fast_type_id.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace flags_internal { |
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// An alias for flag fast type id. This value identifies the flag value type |
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// similarly to typeid(T), without relying on RTTI being available. In most |
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// cases this id is enough to uniquely identify the flag's value type. In a few |
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// cases we'll have to resort to using actual RTTI implementation if it is |
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// available. |
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using FlagFastTypeId = absl::base_internal::FastTypeIdType; |
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// Options that control SetCommandLineOptionWithMode. |
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enum FlagSettingMode { |
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// update the flag's value unconditionally (can call this multiple times). |
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SET_FLAGS_VALUE, |
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// update the flag's value, but *only if* it has not yet been updated |
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// with SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef". |
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SET_FLAG_IF_DEFAULT, |
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// set the flag's default value to this. If the flag has not been updated |
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// yet (via SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef") |
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// change the flag's current value to the new default value as well. |
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SET_FLAGS_DEFAULT |
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}; |
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// Options that control ParseFrom: Source of a value. |
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enum ValueSource { |
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// Flag is being set by value specified on a command line. |
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kCommandLine, |
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// Flag is being set by value specified in the code. |
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kProgrammaticChange, |
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}; |
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// Handle to FlagState objects. Specific flag state objects will restore state |
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// of a flag produced this flag state from method CommandLineFlag::SaveState(). |
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class FlagStateInterface { |
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public: |
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virtual ~FlagStateInterface(); |
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// Restores the flag originated this object to the saved state. |
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virtual void Restore() const = 0; |
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}; |
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} // namespace flags_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
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