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   _Tp* __ptr_;
  26 };
  27
  28 template <class _Tp>
  29 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 auto_ptr {
  30 private:
  31   _Tp* __ptr_;
  32
  33 public:
  34   typedef _Tp element_type;
  35
  36   _LIBCPP_HIDE_FROM_ABI explicit auto_ptr(_Tp* __p = 0) _NOEXCEPT : __ptr_(__p) {}
  37   _LIBCPP_HIDE_FROM_ABI auto_ptr(auto_ptr& __p) _NOEXCEPT : __ptr_(__p.release()) {}
  38   template <class _Up>
  39   _LIBCPP_HIDE_FROM_ABI auto_ptr(auto_ptr<_Up>& __p) _NOEXCEPT : __ptr_(__p.release()) {}
  40   _LIBCPP_HIDE_FROM_ABI auto_ptr& operator=(auto_ptr& __p) _NOEXCEPT {
  41     reset(__p.release());
  42     return *this;
  43   }
  44   template <class _Up>
  45   _LIBCPP_HIDE_FROM_ABI auto_ptr& operator=(auto_ptr<_Up>& __p) _NOEXCEPT {
  46     reset(__p.release());
  47     return *this;
  48   }
  49   _LIBCPP_HIDE_FROM_ABI auto_ptr& operator=(auto_ptr_ref<_Tp> __p) _NOEXCEPT {
  50     reset(__p.__ptr_);
  51     return *this;
  52   }
  53   _LIBCPP_HIDE_FROM_ABI ~auto_ptr() _NOEXCEPT { delete __ptr_; }
  54
  55   _LIBCPP_HIDE_FROM_ABI _Tp& operator*() const _NOEXCEPT { return *__ptr_; }
  56   _LIBCPP_HIDE_FROM_ABI _Tp* operator->() const _NOEXCEPT { return __ptr_; }
  57   _LIBCPP_HIDE_FROM_ABI _Tp* get() const _NOEXCEPT { return __ptr_; }
  58   _LIBCPP_HIDE_FROM_ABI _Tp* release() _NOEXCEPT {
  59     _Tp* __t = __ptr_;
  60     __ptr_   = nullptr;
  61     return __t;
  62   }
  63   _LIBCPP_HIDE_FROM_ABI void reset(_Tp* __p = 0) _NOEXCEPT {
  64     if (__ptr_ != __p)
  65       delete __ptr_;
  66     __ptr_ = __p;
  67   }
  68
  69   _LIBCPP_HIDE_FROM_ABI auto_ptr(auto_ptr_ref<_Tp> __p) _NOEXCEPT : __ptr_(__p.__ptr_) {}
  70   template <class _Up>
  71   _LIBCPP_HIDE_FROM_ABI operator auto_ptr_ref<_Up>() _NOEXCEPT {
  72     auto_ptr_ref<_Up> __t;
  73     __t.__ptr_ = release();
  74     return __t;
  75   }
  76   template <class _Up>
  77   _LIBCPP_HIDE_FROM_ABI operator auto_ptr<_Up>() _NOEXCEPT {
  78     return auto_ptr<_Up>(release());
  79   }
  80 };
  81
  82 template <>
  83 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX11 auto_ptr<void> {
  84 public:
  85   typedef void element_type;
  86 };
  87
  88 _LIBCPP_END_NAMESPACE_STD
  89
  90 #endif // _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR)
  91
  92 #endif // _LIBCPP___MEMORY_AUTO_PTR_H