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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/generationhandler.h>
#include <memory>
namespace search {
/**
* General class for guarding a component that is using an underlying generation handler.
**/
template <typename T>
class ComponentGuard
{
private:
using Guard = vespalib::GenerationHandler::Guard;
using Component = std::shared_ptr<T>;
Component _component;
Guard _generationGuard;
public:
ComponentGuard();
ComponentGuard(ComponentGuard &&);
ComponentGuard & operator = (ComponentGuard &&);
ComponentGuard(const ComponentGuard &);
ComponentGuard & operator = (const ComponentGuard &);
virtual ~ComponentGuard();
/**
* Creates a guard for the shared pointer of the given component.
**/
ComponentGuard(const Component & component);
const T * get() const { return _component.get(); }
const Component & getSP() const { return _component; }
const T * operator -> () const { return _component.get(); }
const T & operator * () const { return *_component.get(); }
T * get() { return _component.get(); }
T * operator -> () { return _component.get(); }
T & operator * () { return *_component.get(); }
bool valid() const { return _component.get() != NULL; }
};
}
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