libcxx/include/__memory/auto_ptr.h

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___MEMORY_AUTO_PTR_H
#define _LIBCPP___MEMORY_AUTO_PTR_H

#include <__config>
#include <__nullptr>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp>
struct _LIBCPP_DEPRECATED_IN_CXX11 auto_ptr_ref
{
    _Tp* __ptr_;
};

template<class _Tp>
class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 auto_ptr
{
private:
    _Tp* __ptr_;
public:
    typedef _Tp element_type;

    _LIBCPP_INLINE_VISIBILITY explicit auto_ptr(_Tp* __p = 0) _NOEXCEPT : __ptr_(__p) {}
    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr& __p) _NOEXCEPT : __ptr_(__p.release()) {}
    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr<_Up>& __p) _NOEXCEPT
        : __ptr_(__p.release()) {}
    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr& __p) _NOEXCEPT
        {reset(__p.release()); return *this;}
    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr<_Up>& __p) _NOEXCEPT
        {reset(__p.release()); return *this;}
    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr_ref<_Tp> __p) _NOEXCEPT
        {reset(__p.__ptr_); return *this;}
    _LIBCPP_INLINE_VISIBILITY ~auto_ptr() _NOEXCEPT {delete __ptr_;}

    _LIBCPP_INLINE_VISIBILITY _Tp& operator*() const _NOEXCEPT
        {return *__ptr_;}
    _LIBCPP_INLINE_VISIBILITY _Tp* operator->() const _NOEXCEPT {return __ptr_;}
    _LIBCPP_INLINE_VISIBILITY _Tp* get() const _NOEXCEPT {return __ptr_;}
    _LIBCPP_INLINE_VISIBILITY _Tp* release() _NOEXCEPT
    {
        _Tp* __t = __ptr_;
        __ptr_ = nullptr;
        return __t;
    }
    _LIBCPP_INLINE_VISIBILITY void reset(_Tp* __p = 0) _NOEXCEPT
    {
        if (__ptr_ != __p)
            delete __ptr_;
        __ptr_ = __p;
    }

    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr_ref<_Tp> __p) _NOEXCEPT : __ptr_(__p.__ptr_) {}
    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr_ref<_Up>() _NOEXCEPT
        {auto_ptr_ref<_Up> __t; __t.__ptr_ = release(); return __t;}
    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr<_Up>() _NOEXCEPT
        {return auto_ptr<_Up>(release());}
};

template <>
class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 auto_ptr<void>
{
public:
    typedef void element_type;
};

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___MEMORY_AUTO_PTR_H