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
65 lines
2 KiB
C++
65 lines
2 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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//
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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/base/config.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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// 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) && !defined(__clang__)
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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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ABSL_NAMESPACE_END
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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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