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// -*- 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_EXPERIMENTAL_MEMORY
#define _LIBCPP_EXPERIMENTAL_MEMORY
/*
experimental/memory synopsis
namespace std::experimental::inline fundamentals_v2 {
template <class W> class observer_ptr {
public:
using element_type = W;
using pointer = add_pointer_t<W>; // exposition-only
using reference = add_lvalue_reference_t<W>; // exposition-only
// default ctor
constexpr observer_ptr() noexcept;
// pointer-accepting ctors
constexpr observer_ptr(nullptr_t) noexcept;
constexpr explicit observer_ptr(pointer) noexcept;
// copying ctors (in addition to compiler-generated copy ctor)
template <class W2> constexpr observer_ptr(observer_ptr<W2>) noexcept;
// observers
constexpr pointer get() const noexcept;
constexpr reference operator*() const;
constexpr pointer operator->() const noexcept;
constexpr explicit operator bool() const noexcept;
// conversions
constexpr explicit operator pointer() const noexcept;
// modifiers
constexpr pointer release() noexcept;
constexpr void reset(pointer = nullptr) noexcept;
constexpr void swap(observer_ptr&) noexcept;
};
}
*/
#include <__functional/hash.h>
#include <__functional/operations.h>
#include <__type_traits/add_lvalue_reference.h>
#include <__type_traits/add_pointer.h>
#include <__type_traits/common_type.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_convertible.h>
#include <cstddef>
#include <experimental/__config>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#ifdef _LIBCPP_ENABLE_EXPERIMENTAL
_LIBCPP_BEGIN_NAMESPACE_LFTS_V2
# if _LIBCPP_STD_VER >= 17
template <class _Wp>
class observer_ptr {
public:
using element_type = _Wp;
// constructors
_LIBCPP_HIDE_FROM_ABI constexpr observer_ptr() noexcept : __ptr_(nullptr) {}
_LIBCPP_HIDE_FROM_ABI constexpr observer_ptr(nullptr_t) noexcept : __ptr_(nullptr) {}
_LIBCPP_HIDE_FROM_ABI constexpr explicit observer_ptr(element_type* __p) noexcept : __ptr_(__p) {}
template <class _W2, __enable_if_t<is_convertible<_W2*, _Wp*>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr observer_ptr(observer_ptr<_W2> __other) noexcept : __ptr_(__other.get()) {}
// observers
_LIBCPP_HIDE_FROM_ABI constexpr element_type* get() const noexcept { return __ptr_; }
_LIBCPP_HIDE_FROM_ABI constexpr add_lvalue_reference_t<_Wp> operator*() const { return *__ptr_; }
_LIBCPP_HIDE_FROM_ABI constexpr element_type* operator->() const noexcept { return __ptr_; }
_LIBCPP_HIDE_FROM_ABI constexpr explicit operator bool() const noexcept { return __ptr_ != nullptr; }
// conversions
_LIBCPP_HIDE_FROM_ABI constexpr explicit operator element_type*() const noexcept { return __ptr_; }
// modifiers
_LIBCPP_HIDE_FROM_ABI constexpr void reset(element_type* __p = nullptr) noexcept { __ptr_ = __p; }
_LIBCPP_HIDE_FROM_ABI constexpr void swap(observer_ptr& __other) noexcept {
observer_ptr __tmp = __other;
__other = *this;
*this = __tmp;
}
_LIBCPP_HIDE_FROM_ABI constexpr element_type* release() noexcept {
observer_ptr __p;
__p.swap(*this);
return __p.get();
}
private:
element_type* __ptr_;
};
// specializations
template <class _Wp>
_LIBCPP_HIDE_FROM_ABI constexpr void swap(observer_ptr<_Wp>& __a, observer_ptr<_Wp>& __b) noexcept {
__a.swap(__b);
}
template <class _Wp>
_LIBCPP_HIDE_FROM_ABI observer_ptr<_Wp> make_observer(_Wp* __ptr) noexcept {
return observer_ptr<_Wp>{__ptr};
}
template <class _W1, class _W2>
_LIBCPP_HIDE_FROM_ABI bool operator==(observer_ptr<_W1> __a, observer_ptr<_W2> __b) {
return __a.get() == __b.get();
}
template <class _W1, class _W2>
_LIBCPP_HIDE_FROM_ABI bool operator!=(observer_ptr<_W1> __a, observer_ptr<_W2> __b) {
return !(__a == __b);
}
template <class _Wp>
_LIBCPP_HIDE_FROM_ABI bool operator==(observer_ptr<_Wp> __p, nullptr_t) {
return !__p;
}
template <class _Wp>
_LIBCPP_HIDE_FROM_ABI bool operator==(nullptr_t, observer_ptr<_Wp> __p) {
return !__p;
}
template <class _Wp>
_LIBCPP_HIDE_FROM_ABI bool operator!=(observer_ptr<_Wp> __p, nullptr_t) {
return (bool)__p;
}
template <class _Wp>
_LIBCPP_HIDE_FROM_ABI bool operator!=(nullptr_t, observer_ptr<_Wp> __p) {
return (bool)__p;
}
template <class _W1, class _W2>
_LIBCPP_HIDE_FROM_ABI bool operator<(observer_ptr<_W1> __a, observer_ptr<_W2> __b) {
return std::less<typename std::common_type<_W1*, _W2*>::type>()(__a.get(), __b.get());
}
template <class _W1, class _W2>
_LIBCPP_HIDE_FROM_ABI bool operator>(observer_ptr<_W1> __a, observer_ptr<_W2> __b) {
return __b < __a;
}
template <class _W1, class _W2>
_LIBCPP_HIDE_FROM_ABI bool operator<=(observer_ptr<_W1> __a, observer_ptr<_W2> __b) {
return !(__a > __b);
}
template <class _W1, class _W2>
_LIBCPP_HIDE_FROM_ABI bool operator>=(observer_ptr<_W1> __a, observer_ptr<_W2> __b) {
return !(__a < __b);
}
# endif // _LIBCPP_STD_VER >= 17
_LIBCPP_END_NAMESPACE_LFTS_V2
_LIBCPP_BEGIN_NAMESPACE_STD
// hash
# if _LIBCPP_STD_VER >= 17
template <class _Tp>
struct hash<experimental::observer_ptr<_Tp>> {
_LIBCPP_HIDE_FROM_ABI size_t operator()(const experimental::observer_ptr<_Tp>& __ptr) const noexcept {
return hash<_Tp*>()(__ptr.get());
}
};
# endif // _LIBCPP_STD_VER >= 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_ENABLE_EXPERIMENTAL
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <limits>
#endif
#endif /* _LIBCPP_EXPERIMENTAL_MEMORY */
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