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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "monitored_refcount.h"
namespace vespalib {
/*
* Class containing a reference to a monitored reference count,
* intended to block teardown of the class owning the monitored
* reference count.
*/
class RetainGuard {
public:
RetainGuard(MonitoredRefCount & refCount) noexcept
: _refCount(&refCount)
{
_refCount->retain();
}
RetainGuard(const RetainGuard & rhs) = delete;
RetainGuard & operator=(const RetainGuard & rhs) = delete;
RetainGuard(RetainGuard && rhs) noexcept
: _refCount(rhs._refCount)
{
rhs._refCount = nullptr;
}
RetainGuard & operator=(RetainGuard && rhs) noexcept {
release();
_refCount = rhs._refCount;
rhs._refCount = nullptr;
return *this;
}
~RetainGuard() { release(); }
private:
void release() noexcept{
if (_refCount != nullptr) {
_refCount->release();
_refCount = nullptr;
}
}
MonitoredRefCount * _refCount;
};
}
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