declare.h
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1 //
2 // Copyright 2019 The Abseil Authors.
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 // https://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 // -----------------------------------------------------------------------------
17 // File: declare.h
18 // -----------------------------------------------------------------------------
19 //
20 // This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an
21 // `absl::Flag` for use within a translation unit. You should place this
22 // declaration within the header file associated with the .cc file that defines
23 // and owns the `Flag`.
24 
25 #ifndef ABSL_FLAGS_DECLARE_H_
26 #define ABSL_FLAGS_DECLARE_H_
27 
29 
30 namespace absl {
31 namespace flags_internal {
32 
33 // absl::Flag<T> represents a flag of type 'T' created by ABSL_FLAG.
34 template <typename T>
35 class Flag;
36 
37 } // namespace flags_internal
38 
39 // Flag
40 //
41 // Forward declaration of the `absl::Flag` type for use in defining the macro.
42 template <typename T>
44 
45 } // namespace absl
46 
47 // ABSL_DECLARE_FLAG()
48 //
49 // This macro is a convenience for declaring use of an `absl::Flag` within a
50 // translation unit. This macro should be used within a header file to
51 // declare usage of the flag within any .cc file including that header file.
52 //
53 // The ABSL_DECLARE_FLAG(type, name) macro expands to:
54 //
55 // extern absl::Flag<type> FLAGS_name;
56 #define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag<type> FLAGS_##name
57 
58 #endif // ABSL_FLAGS_DECLARE_H_
Definition: algorithm.h:29


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autogenerated on Wed Jun 19 2019 19:19:56