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Diffstat (limited to 'src/leveldb/util/no_destructor.h')
-rw-r--r-- | src/leveldb/util/no_destructor.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/leveldb/util/no_destructor.h b/src/leveldb/util/no_destructor.h new file mode 100644 index 0000000000..a0d3b8703d --- /dev/null +++ b/src/leveldb/util/no_destructor.h @@ -0,0 +1,46 @@ +// Copyright (c) 2018 The LevelDB Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef STORAGE_LEVELDB_UTIL_NO_DESTRUCTOR_H_ +#define STORAGE_LEVELDB_UTIL_NO_DESTRUCTOR_H_ + +#include <type_traits> +#include <utility> + +namespace leveldb { + +// Wraps an instance whose destructor is never called. +// +// This is intended for use with function-level static variables. +template <typename InstanceType> +class NoDestructor { + public: + template <typename... ConstructorArgTypes> + explicit NoDestructor(ConstructorArgTypes&&... constructor_args) { + static_assert(sizeof(instance_storage_) >= sizeof(InstanceType), + "instance_storage_ is not large enough to hold the instance"); + static_assert( + alignof(decltype(instance_storage_)) >= alignof(InstanceType), + "instance_storage_ does not meet the instance's alignment requirement"); + new (&instance_storage_) + InstanceType(std::forward<ConstructorArgTypes>(constructor_args)...); + } + + ~NoDestructor() = default; + + NoDestructor(const NoDestructor&) = delete; + NoDestructor& operator=(const NoDestructor&) = delete; + + InstanceType* get() { + return reinterpret_cast<InstanceType*>(&instance_storage_); + } + + private: + typename std::aligned_storage<sizeof(InstanceType), + alignof(InstanceType)>::type instance_storage_; +}; + +} // namespace leveldb + +#endif // STORAGE_LEVELDB_UTIL_NO_DESTRUCTOR_H_ |