libcxx/include/__memory/auto_ptr.h

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   3 //
   4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 // See https://llvm.org/LICENSE.txt for license information.
   6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef _LIBCPP___MEMORY_AUTO_PTR_H
  11 #define _LIBCPP___MEMORY_AUTO_PTR_H
  12
  13 #include <__config>
  14
  15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  16 #  pragma GCC system_header
  17 #endif
  18
  19 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR)
  20
  21 _LIBCPP_BEGIN_NAMESPACE_STD
  22
  23 template <class _Tp>
  24 struct _LIBCPP_DEPRECATED_IN_CXX11 auto_ptr_ref
  25 {
  26     _Tp* __ptr_;
  27 };
  28
  29 template<class _Tp>
  30 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 auto_ptr
  31 {
  32 private:
  33     _Tp* __ptr_;
  34 public:
  35     typedef _Tp element_type;
  36
  37     _LIBCPP_INLINE_VISIBILITY explicit auto_ptr(_Tp* __p = 0) _NOEXCEPT : __ptr_(__p) {}
  38     _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr& __p) _NOEXCEPT : __ptr_(__p.release()) {}
  39     template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr<_Up>& __p) _NOEXCEPT
  40         : __ptr_(__p.release()) {}
  41     _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr& __p) _NOEXCEPT
  42         {reset(__p.release()); return *this;}
  43     template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr<_Up>& __p) _NOEXCEPT
  44         {reset(__p.release()); return *this;}
  45     _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr_ref<_Tp> __p) _NOEXCEPT
  46         {reset(__p.__ptr_); return *this;}
  47     _LIBCPP_INLINE_VISIBILITY ~auto_ptr() _NOEXCEPT {delete __ptr_;}
  48
  49     _LIBCPP_INLINE_VISIBILITY _Tp& operator*() const _NOEXCEPT
  50         {return *__ptr_;}
  51     _LIBCPP_INLINE_VISIBILITY _Tp* operator->() const _NOEXCEPT {return __ptr_;}
  52     _LIBCPP_INLINE_VISIBILITY _Tp* get() const _NOEXCEPT {return __ptr_;}
  53     _LIBCPP_INLINE_VISIBILITY _Tp* release() _NOEXCEPT
  54     {
  55         _Tp* __t = __ptr_;
  56         __ptr_ = nullptr;
  57         return __t;
  58     }
  59     _LIBCPP_INLINE_VISIBILITY void reset(_Tp* __p = 0) _NOEXCEPT
  60     {
  61         if (__ptr_ != __p)
  62             delete __ptr_;
  63         __ptr_ = __p;
  64     }
  65
  66     _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr_ref<_Tp> __p) _NOEXCEPT : __ptr_(__p.__ptr_) {}
  67     template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr_ref<_Up>() _NOEXCEPT
  68         {auto_ptr_ref<_Up> __t; __t.__ptr_ = release(); return __t;}
  69     template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr<_Up>() _NOEXCEPT
  70         {return auto_ptr<_Up>(release());}
  71 };
  72
  73 template <>
  74 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 auto_ptr<void>
  75 {
  76 public:
  77     typedef void element_type;
  78 };
  79
  80 _LIBCPP_END_NAMESPACE_STD
  81
  82 #endif // _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR)
  83
  84 #endif // _LIBCPP___MEMORY_AUTO_PTR_H