8f2828c4b4
ccdbb5941 Export of internal Abseil changes 01f5f81f9 Export of internal Abseil changes 2c92bdc7c Export of internal Abseil changes e7ebf9803 Export of internal Abseil changes 2eba343b5 Export of internal Abseil changes a8b03d90e Export of internal Abseil changes 1d31b5c36 Export of internal Abseil changes da3a87690 Export of internal Abseil changes 8faf20461 Exclude empty directories (#697) 2069dc796 Export of internal Abseil changes 4832bf6bf Added a BUILD file in root to expose license. (#695) af8f994af Export of internal Abseil changes 33caf1097 Export of internal Abseil changes cf1a02e2d Export of internal Abseil changes git-subtree-dir: third_party/abseil_cpp git-subtree-split: ccdbb5941f992fabda7eae3ce72f55efc17c826a
68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
//
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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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// simialarly 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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