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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2017 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library 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 GNU Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#ifndef NDN_UTIL_CF_RELEASER_OSX_HPP
#define NDN_UTIL_CF_RELEASER_OSX_HPP
#include "../common.hpp"
#ifndef NDN_CXX_HAVE_OSX_FRAMEWORKS
#error "This file should not be included ..."
#endif
#include <CoreFoundation/CoreFoundation.h>
namespace ndn {
namespace util {
/**
* @brief Helper class to wrap CoreFoundation object pointers
*
* The class is similar in spirit to shared_ptr, but uses CoreFoundation
* mechanisms to retain/release object.
*
* Original implementation by Christopher Hunt and it was borrowed from
* http://www.cocoabuilder.com/archive/cocoa/130776-auto-cfrelease-and.html
*
* @note The filename cf-releaser-osx.hpp is an intentional violation of code-style rule 2.1.
* Having '-osx' suffix is necessary to prevent installation on non-macOS platforms.
*/
template<class T>
class CFReleaser
{
public: // Construction/destruction
CFReleaser()
: m_typeRef(nullptr)
{
}
CFReleaser(const T& typeRef)
: m_typeRef(typeRef)
{
}
CFReleaser(const CFReleaser& inReleaser)
: m_typeRef(nullptr)
{
retain(inReleaser.m_typeRef);
}
CFReleaser&
operator=(const T& typeRef)
{
if (typeRef != m_typeRef) {
release();
m_typeRef = typeRef;
}
return *this;
}
CFReleaser&
operator=(const CFReleaser& inReleaser)
{
retain(inReleaser.m_typeRef);
return *this;
}
~CFReleaser()
{
release();
}
public: // Access
const T&
get() const
{
return m_typeRef;
}
T&
get()
{
return m_typeRef;
}
bool
operator==(const std::nullptr_t&)
{
return m_typeRef == nullptr;
}
bool
operator!=(const std::nullptr_t&)
{
return m_typeRef != nullptr;
}
public: // Miscellaneous
void
retain(const T& typeRef)
{
if (typeRef != nullptr) {
CFRetain(typeRef);
}
release();
m_typeRef = typeRef;
}
void
retain()
{
T typeRef = m_typeRef;
m_typeRef = nullptr;
retain(typeRef);
}
void
release()
{
if (m_typeRef != nullptr) {
CFRelease(m_typeRef);
m_typeRef = nullptr;
}
};
private:
T m_typeRef;
};
} // namespace util
} // namespace ndn
#endif // NDN_UTIL_CF_RELEASER_OSX_HPP