| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566 | ////  Copyright 2019 The Abseil Authors.//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at////      https://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License.//// -----------------------------------------------------------------------------// File: declare.h// -----------------------------------------------------------------------------//// This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an// `absl::Flag` for use within a translation unit. You should place this// declaration within the header file associated with the .cc file that defines// and owns the `Flag`.#ifndef ABSL_FLAGS_DECLARE_H_#define ABSL_FLAGS_DECLARE_H_#include "absl/base/config.h"#include "absl/strings/string_view.h"namespace absl {ABSL_NAMESPACE_BEGINnamespace flags_internal {// absl::Flag<T> represents a flag of type 'T' created by ABSL_FLAG.template <typename T>class Flag;}  // namespace flags_internal// Flag//// Forward declaration of the `absl::Flag` type for use in defining the macro.#if defined(_MSC_VER) && !defined(__clang__)template <typename T>class Flag;#elsetemplate <typename T>using Flag = flags_internal::Flag<T>;#endifABSL_NAMESPACE_END}  // namespace absl// ABSL_DECLARE_FLAG()//// This macro is a convenience for declaring use of an `absl::Flag` within a// translation unit. This macro should be used within a header file to// declare usage of the flag within any .cc file including that header file.//// The ABSL_DECLARE_FLAG(type, name) macro expands to:////   extern absl::Flag<type> FLAGS_name;#define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag<type> FLAGS_##name#endif  // ABSL_FLAGS_DECLARE_H_
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