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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/db/s/collection_metadata.h"
namespace mongo {
/**
* Acts like a shared pointer and exposes sharding filtering metadata to be used by server
* operations. It is allowed to be referenced outside of collection lock, but all implementations
* must be able to outlive the object from which they were obtained.
*/
class ScopedCollectionMetadata {
public:
class Impl {
public:
virtual ~Impl() = default;
virtual const CollectionMetadata& get() = 0;
protected:
Impl() = default;
};
ScopedCollectionMetadata(std::shared_ptr<Impl> impl) : _impl(std::move(impl)) {}
const auto& get() const {
return _impl->get();
}
const auto* operator-> () const {
return &get();
}
const auto& operator*() const {
return get();
}
private:
std::shared_ptr<Impl> _impl;
};
} // namespace mongo
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