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Diffstat (limited to 'libs/binder/include/binder/Nullable.h')
-rw-r--r-- | libs/binder/include/binder/Nullable.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/libs/binder/include/binder/Nullable.h b/libs/binder/include/binder/Nullable.h new file mode 100644 index 0000000000..b605bd3315 --- /dev/null +++ b/libs/binder/include/binder/Nullable.h @@ -0,0 +1,44 @@ +/* + * Copyright (C) 2020 The Android Open Source Project + * + * 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 + * + * http://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. + */ +#pragma once + +#include <memory> +#include <utility> + +namespace android { + +namespace aidl { + +// nullable/make_nullable provide source-level compatibility between std::opional and std::unique_ptr +// usage: +// nullable<Foo> a; +// nullable<Foo> b = make_nullable<Foo>(...); +// auto c = make_nullable<Foo>(...); +// c.reset(); +// c = make_nullable<Foo>(...); +// c = std::move(a); + +template <typename T> +using nullable = std::unique_ptr<T>; + +template <typename T, typename... Args> +inline nullable<T> make_nullable(Args&&... args) { + return std::make_unique<T>(std::forward<Args>(args)...); +} + +} // namespace aidl + +} // namespace android
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