1// Copyright 2017 The Abseil Authors.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// https://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14//
15
16#ifndef ABSL_BASE_INTERNAL_IDENTITY_H_
17#define ABSL_BASE_INTERNAL_IDENTITY_H_
18
19#include "absl/base/config.h"
20
21namespace absl {
22ABSL_NAMESPACE_BEGIN
23namespace internal {
24
25// This is a back-fill of C++20's `std::type_identity`.
26template <typename T>
27struct type_identity {
28 typedef T type;
29};
30
31// This is a back-fill of C++20's `std::type_identity_t`.
32template <typename T>
33using type_identity_t = typename type_identity<T>::type;
34
35} // namespace internal
36ABSL_NAMESPACE_END
37} // namespace absl
38
39#endif // ABSL_BASE_INTERNAL_IDENTITY_H_
40