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 //      http://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 #include "absl/types/optional.h"
16 
17 #ifndef ABSL_HAVE_STD_OPTIONAL
18 namespace absl {
19 
20 nullopt_t::init_t nullopt_t::init;
21 extern const nullopt_t nullopt{nullopt_t::init};
22 
23 }  // namespace absl
24 #endif  // ABSL_HAVE_STD_OPTIONAL
25