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/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#pragma once
#include <functional>
namespace KODI
{
namespace UTILS
{
/*! \class CScopeGuard
\brief Generic scopeguard designed to handle any type of handle
This is not necessary but recommended to cut down on some typing
using CSocketHandle = CScopeGuard<SOCKET, INVALID_SOCKET, closesocket>;
CSocketHandle sh(closesocket, open(thingy));
*/
template<typename Handle, Handle invalid, typename Deleter>
class CScopeGuard
{
public:
CScopeGuard(std::function<Deleter> del, Handle handle = invalid)
: m_handle{handle}
, m_deleter{del}
{ };
~CScopeGuard() noexcept
{
reset();
}
operator Handle() const
{
return m_handle;
}
operator bool() const
{
return m_handle != invalid;
}
/*! \brief attach a new handle to this instance, if there's
already a handle it will be closed.
\param[in] handle The handle to manage
*/
void attach(Handle handle)
{
reset();
m_handle = handle;
}
/*! \brief release the managed handle so that it won't be auto closed
\return The handle being managed by the guard
*/
Handle release()
{
Handle h = m_handle;
m_handle = invalid;
return h;
}
/*! \brief reset the instance, closing any managed handle and setting it to invalid
*/
void reset()
{
if (m_handle != invalid)
{
m_deleter(m_handle);
m_handle = invalid;
}
}
//Disallow default construction and copying
CScopeGuard() = delete;
CScopeGuard(const CScopeGuard& rhs) = delete;
CScopeGuard& operator= (const CScopeGuard& rhs) = delete;
//Allow moving
CScopeGuard(CScopeGuard&& rhs) noexcept
: m_handle{std::move(rhs.m_handle)}, m_deleter{std::move(rhs.m_deleter)}
{
// Bring moved-from object into released state so destructor will not do anything
rhs.release();
}
CScopeGuard& operator=(CScopeGuard&& rhs) noexcept
{
attach(rhs.release());
m_deleter = std::move(rhs.m_deleter);
return *this;
}
private:
Handle m_handle;
std::function<Deleter> m_deleter;
};
}
}
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