Abseil Common Libraries (C++) (grcp 依赖)
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63 lines
2.0 KiB
63 lines
2.0 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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// |
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// ----------------------------------------------------------------------------- |
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// File: declare.h |
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// ----------------------------------------------------------------------------- |
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// |
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// This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an |
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// `absl::Flag` for use within a translation unit. You should place this |
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// declaration within the header file associated with the .cc file that defines |
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// and owns the `Flag`. |
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#ifndef ABSL_FLAGS_DECLARE_H_ |
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#define ABSL_FLAGS_DECLARE_H_ |
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#include "absl/strings/string_view.h" |
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namespace absl { |
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namespace flags_internal { |
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// absl::Flag<T> represents a flag of type 'T' created by ABSL_FLAG. |
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template <typename T> |
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class Flag; |
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} // namespace flags_internal |
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// Flag |
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// |
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// Forward declaration of the `absl::Flag` type for use in defining the macro. |
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#if defined(_MSC_VER) |
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template <typename T> |
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class Flag; |
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#else |
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template <typename T> |
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using Flag = flags_internal::Flag<T>; |
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#endif |
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} // namespace absl |
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// ABSL_DECLARE_FLAG() |
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// |
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// This macro is a convenience for declaring use of an `absl::Flag` within a |
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// translation unit. This macro should be used within a header file to |
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// declare usage of the flag within any .cc file including that header file. |
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// |
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// The ABSL_DECLARE_FLAG(type, name) macro expands to: |
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// |
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// extern absl::Flag<type> FLAGS_name; |
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#define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag<type> FLAGS_##name |
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#endif // ABSL_FLAGS_DECLARE_H_
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