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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