Edit: /usr/include/c++/11/bits/unique_ptr.h (32537B)
// unique_ptr implementation -*- C++ -*-
// Copyright (C) 2008-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This 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 General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
//
.
/** @file bits/unique_ptr.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{memory}
*/
#ifndef _UNIQUE_PTR_H
#define _UNIQUE_PTR_H 1
#include
#include
#include
#include
#include
#include
#include
#if __cplusplus > 201703L
# include
# include
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup pointer_abstractions
* @{
*/
#if _GLIBCXX_USE_DEPRECATED
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
template class auto_ptr;
#pragma GCC diagnostic pop
#endif
/// Primary template of default_delete, used by unique_ptr for single objects
template
struct default_delete
{
/// Default constructor
constexpr default_delete() noexcept = default;
/** @brief Converting constructor.
*
* Allows conversion from a deleter for objects of another type, `_Up`,
* only if `_Up*` is convertible to `_Tp*`.
*/
template>>
default_delete(const default_delete<_Up>&) noexcept { }
/// Calls `delete __ptr`
void
operator()(_Tp* __ptr) const
{
static_assert(!is_void<_Tp>::value,
"can't delete pointer to incomplete type");
static_assert(sizeof(_Tp)>0,
"can't delete pointer to incomplete type");
delete __ptr;
}
};
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 740 - omit specialization for array objects with a compile time length
/// Specialization of default_delete for arrays, used by `unique_ptr`
template
struct default_delete<_Tp[]>
{
public:
/// Default constructor
constexpr default_delete() noexcept = default;
/** @brief Converting constructor.
*
* Allows conversion from a deleter for arrays of another type, such as
* a const-qualified version of `_Tp`.
*
* Conversions from types derived from `_Tp` are not allowed because
* it is undefined to `delete[]` an array of derived types through a
* pointer to the base type.
*/
template>>
default_delete(const default_delete<_Up[]>&) noexcept { }
/// Calls `delete[] __ptr`
template
typename enable_if::value>::type
operator()(_Up* __ptr) const
{
static_assert(sizeof(_Tp)>0,
"can't delete pointer to incomplete type");
delete [] __ptr;
}
};
/// @cond undocumented
// Manages the pointer and deleter of a unique_ptr
template
class __uniq_ptr_impl
{
template
struct _Ptr
{
using type = _Up*;
};
template
struct
_Ptr<_Up, _Ep, __void_t::type::pointer>>
{
using type = typename remove_reference<_Ep>::type::pointer;
};
public:
using _DeleterConstraint = enable_if<
__and_<__not_>,
is_default_constructible<_Dp>>::value>;
using pointer = typename _Ptr<_Tp, _Dp>::type;
static_assert( !is_rvalue_reference<_Dp>::value,
"unique_ptr's deleter type must be a function object type"
" or an lvalue reference type" );
__uniq_ptr_impl() = default;
__uniq_ptr_impl(pointer __p) : _M_t() { _M_ptr() = __p; }
template
__uniq_ptr_impl(pointer __p, _Del&& __d)
: _M_t(__p, std::forward<_Del>(__d)) { }
__uniq_ptr_impl(__uniq_ptr_impl&& __u) noexcept
: _M_t(std::move(__u._M_t))
{ __u._M_ptr() = nullptr; }
__uniq_ptr_impl& operator=(__uniq_ptr_impl&& __u) noexcept
{
reset(__u.release());
_M_deleter() = std::forward<_Dp>(__u._M_deleter());
return *this;
}
pointer& _M_ptr() { return std::get<0>(_M_t); }
pointer _M_ptr() const { return std::get<0>(_M_t); }
_Dp& _M_deleter() { return std::get<1>(_M_t); }
const _Dp& _M_deleter() const { return std::get<1>(_M_t); }
void reset(pointer __p) noexcept
{
const pointer __old_p = _M_ptr();
_M_ptr() = __p;
if (__old_p)
_M_deleter()(__old_p);
}
pointer release() noexcept
{
pointer __p = _M_ptr();
_M_ptr() = nullptr;
return __p;
}
void
swap(__uniq_ptr_impl& __rhs) noexcept
{
using std::swap;
swap(this->_M_ptr(), __rhs._M_ptr());
swap(this->_M_deleter(), __rhs._M_deleter());
}
private:
tuple _M_t;
};
// Defines move construction + assignment as either defaulted or deleted.
template ::value,
bool = is_move_assignable<_Dp>::value>
struct __uniq_ptr_data : __uniq_ptr_impl<_Tp, _Dp>
{
using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl;
__uniq_ptr_data(__uniq_ptr_data&&) = default;
__uniq_ptr_data& operator=(__uniq_ptr_data&&) = default;
};
template
struct __uniq_ptr_data<_Tp, _Dp, true, false> : __uniq_ptr_impl<_Tp, _Dp>
{
using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl;
__uniq_ptr_data(__uniq_ptr_data&&) = default;
__uniq_ptr_data& operator=(__uniq_ptr_data&&) = delete;
};
template
struct __uniq_ptr_data<_Tp, _Dp, false, true> : __uniq_ptr_impl<_Tp, _Dp>
{
using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl;
__uniq_ptr_data(__uniq_ptr_data&&) = delete;
__uniq_ptr_data& operator=(__uniq_ptr_data&&) = default;
};
template
struct __uniq_ptr_data<_Tp, _Dp, false, false> : __uniq_ptr_impl<_Tp, _Dp>
{
using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl;
__uniq_ptr_data(__uniq_ptr_data&&) = delete;
__uniq_ptr_data& operator=(__uniq_ptr_data&&) = delete;
};
/// @endcond
/// 20.7.1.2 unique_ptr for single objects.
template >
class unique_ptr
{
template
using _DeleterConstraint =
typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint::type;
__uniq_ptr_data<_Tp, _Dp> _M_t;
public:
using pointer = typename __uniq_ptr_impl<_Tp, _Dp>::pointer;
using element_type = _Tp;
using deleter_type = _Dp;
private:
// helper template for detecting a safe conversion from another
// unique_ptr
template
using __safe_conversion_up = __and_<
is_convertible::pointer, pointer>,
__not_>
>;
public:
// Constructors.
/// Default constructor, creates a unique_ptr that owns nothing.
template>
constexpr unique_ptr() noexcept
: _M_t()
{ }
/** Takes ownership of a pointer.
*
* @param __p A pointer to an object of @c element_type
*
* The deleter will be value-initialized.
*/
template>
explicit
unique_ptr(pointer __p) noexcept
: _M_t(__p)
{ }
/** Takes ownership of a pointer.
*
* @param __p A pointer to an object of @c element_type
* @param __d A reference to a deleter.
*
* The deleter will be initialized with @p __d
*/
template>>
unique_ptr(pointer __p, const deleter_type& __d) noexcept
: _M_t(__p, __d) { }
/** Takes ownership of a pointer.
*
* @param __p A pointer to an object of @c element_type
* @param __d An rvalue reference to a (non-reference) deleter.
*
* The deleter will be initialized with @p std::move(__d)
*/
template>>
unique_ptr(pointer __p,
__enable_if_t::value,
_Del&&> __d) noexcept
: _M_t(__p, std::move(__d))
{ }
template::type>
unique_ptr(pointer,
__enable_if_t::value,
_DelUnref&&>) = delete;
/// Creates a unique_ptr that owns nothing.
template>
constexpr unique_ptr(nullptr_t) noexcept
: _M_t()
{ }
// Move constructors.
/// Move constructor.
unique_ptr(unique_ptr&&) = default;
/** @brief Converting constructor from another type
*
* Requires that the pointer owned by @p __u is convertible to the
* type of pointer owned by this object, @p __u does not own an array,
* and @p __u has a compatible deleter type.
*/
template,
typename conditional::value,
is_same<_Ep, _Dp>,
is_convertible<_Ep, _Dp>>::type>>
unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept
: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
{ }
#if _GLIBCXX_USE_DEPRECATED
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
/// Converting constructor from @c auto_ptr
template, is_same<_Dp, default_delete<_Tp>>>>
unique_ptr(auto_ptr<_Up>&& __u) noexcept;
#pragma GCC diagnostic pop
#endif
/// Destructor, invokes the deleter if the stored pointer is not null.
~unique_ptr() noexcept
{
static_assert(__is_invocable::value,
"unique_ptr's deleter must be invocable with a pointer");
auto& __ptr = _M_t._M_ptr();
if (__ptr != nullptr)
get_deleter()(std::move(__ptr));
__ptr = pointer();
}
// Assignment.
/** @brief Move assignment operator.
*
* Invokes the deleter if this object owns a pointer.
*/
unique_ptr& operator=(unique_ptr&&) = default;
/** @brief Assignment from another type.
*
* @param __u The object to transfer ownership from, which owns a
* convertible pointer to a non-array object.
*
* Invokes the deleter if this object owns a pointer.
*/
template
typename enable_if< __and_<
__safe_conversion_up<_Up, _Ep>,
is_assignable
>::value,
unique_ptr&>::type
operator=(unique_ptr<_Up, _Ep>&& __u) noexcept
{
reset(__u.release());
get_deleter() = std::forward<_Ep>(__u.get_deleter());
return *this;
}
/// Reset the %unique_ptr to empty, invoking the deleter if necessary.
unique_ptr&
operator=(nullptr_t) noexcept
{
reset();
return *this;
}
// Observers.
/// Dereference the stored pointer.
typename add_lvalue_reference::type
operator*() const
{
__glibcxx_assert(get() != pointer());
return *get();
}
/// Return the stored pointer.
pointer
operator->() const noexcept
{
_GLIBCXX_DEBUG_PEDASSERT(get() != pointer());
return get();
}
/// Return the stored pointer.
pointer
get() const noexcept
{ return _M_t._M_ptr(); }
/// Return a reference to the stored deleter.
deleter_type&
get_deleter() noexcept
{ return _M_t._M_deleter(); }
/// Return a reference to the stored deleter.
const deleter_type&
get_deleter() const noexcept
{ return _M_t._M_deleter(); }
/// Return @c true if the stored pointer is not null.
explicit operator bool() const noexcept
{ return get() == pointer() ? false : true; }
// Modifiers.
/// Release ownership of any stored pointer.
pointer
release() noexcept
{ return _M_t.release(); }
/** @brief Replace the stored pointer.
*
* @param __p The new pointer to store.
*
* The deleter will be invoked if a pointer is already owned.
*/
void
reset(pointer __p = pointer()) noexcept
{
static_assert(__is_invocable::value,
"unique_ptr's deleter must be invocable with a pointer");
_M_t.reset(std::move(__p));
}
/// Exchange the pointer and deleter with another object.
void
swap(unique_ptr& __u) noexcept
{
static_assert(__is_swappable<_Dp>::value, "deleter must be swappable");
_M_t.swap(__u._M_t);
}
// Disable copy from lvalue.
unique_ptr(const unique_ptr&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
};
/// 20.7.1.3 unique_ptr for array objects with a runtime length
// [unique.ptr.runtime]
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 740 - omit specialization for array objects with a compile time length
template
class unique_ptr<_Tp[], _Dp>
{
template
using _DeleterConstraint =
typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint::type;
__uniq_ptr_data<_Tp, _Dp> _M_t;
template
using __remove_cv = typename remove_cv<_Up>::type;
// like is_base_of<_Tp, _Up> but false if unqualified types are the same
template
using __is_derived_Tp
= __and_< is_base_of<_Tp, _Up>,
__not_, __remove_cv<_Up>>> >;
public:
using pointer = typename __uniq_ptr_impl<_Tp, _Dp>::pointer;
using element_type = _Tp;
using deleter_type = _Dp;
// helper template for detecting a safe conversion from another
// unique_ptr
template,
typename _UP_pointer = typename _UPtr::pointer,
typename _UP_element_type = typename _UPtr::element_type>
using __safe_conversion_up = __and_<
is_array<_Up>,
is_same,
is_same<_UP_pointer, _UP_element_type*>,
is_convertible<_UP_element_type(*)[], element_type(*)[]>
>;
// helper template for detecting a safe conversion from a raw pointer
template
using __safe_conversion_raw = __and_<
__or_<__or_,
is_same<_Up, nullptr_t>>,
__and_,
is_same,
is_convertible<
typename remove_pointer<_Up>::type(*)[],
element_type(*)[]>
>
>
>;
// Constructors.
/// Default constructor, creates a unique_ptr that owns nothing.
template>
constexpr unique_ptr() noexcept
: _M_t()
{ }
/** Takes ownership of a pointer.
*
* @param __p A pointer to an array of a type safely convertible
* to an array of @c element_type
*
* The deleter will be value-initialized.
*/
template,
typename = typename enable_if<
__safe_conversion_raw<_Up>::value, bool>::type>
explicit
unique_ptr(_Up __p) noexcept
: _M_t(__p)
{ }
/** Takes ownership of a pointer.
*
* @param __p A pointer to an array of a type safely convertible
* to an array of @c element_type
* @param __d A reference to a deleter.
*
* The deleter will be initialized with @p __d
*/
template,
is_copy_constructible<_Del>>>
unique_ptr(_Up __p, const deleter_type& __d) noexcept
: _M_t(__p, __d) { }
/** Takes ownership of a pointer.
*
* @param __p A pointer to an array of a type safely convertible
* to an array of @c element_type
* @param __d A reference to a deleter.
*
* The deleter will be initialized with @p std::move(__d)
*/
template,
is_move_constructible<_Del>>>
unique_ptr(_Up __p,
__enable_if_t::value,
_Del&&> __d) noexcept
: _M_t(std::move(__p), std::move(__d))
{ }
template::type,
typename = _Require<__safe_conversion_raw<_Up>>>
unique_ptr(_Up,
__enable_if_t::value,
_DelUnref&&>) = delete;
/// Move constructor.
unique_ptr(unique_ptr&&) = default;
/// Creates a unique_ptr that owns nothing.
template>
constexpr unique_ptr(nullptr_t) noexcept
: _M_t()
{ }
template,
typename conditional::value,
is_same<_Ep, _Dp>,
is_convertible<_Ep, _Dp>>::type>>
unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept
: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
{ }
/// Destructor, invokes the deleter if the stored pointer is not null.
~unique_ptr()
{
auto& __ptr = _M_t._M_ptr();
if (__ptr != nullptr)
get_deleter()(__ptr);
__ptr = pointer();
}
// Assignment.
/** @brief Move assignment operator.
*
* Invokes the deleter if this object owns a pointer.
*/
unique_ptr&
operator=(unique_ptr&&) = default;
/** @brief Assignment from another type.
*
* @param __u The object to transfer ownership from, which owns a
* convertible pointer to an array object.
*
* Invokes the deleter if this object owns a pointer.
*/
template
typename
enable_if<__and_<__safe_conversion_up<_Up, _Ep>,
is_assignable
>::value,
unique_ptr&>::type
operator=(unique_ptr<_Up, _Ep>&& __u) noexcept
{
reset(__u.release());
get_deleter() = std::forward<_Ep>(__u.get_deleter());
return *this;
}
/// Reset the %unique_ptr to empty, invoking the deleter if necessary.
unique_ptr&
operator=(nullptr_t) noexcept
{
reset();
return *this;
}
// Observers.
/// Access an element of owned array.
typename std::add_lvalue_reference::type
operator[](size_t __i) const
{
__glibcxx_assert(get() != pointer());
return get()[__i];
}
/// Return the stored pointer.
pointer
get() const noexcept
{ return _M_t._M_ptr(); }
/// Return a reference to the stored deleter.
deleter_type&
get_deleter() noexcept
{ return _M_t._M_deleter(); }
/// Return a reference to the stored deleter.
const deleter_type&
get_deleter() const noexcept
{ return _M_t._M_deleter(); }
/// Return @c true if the stored pointer is not null.
explicit operator bool() const noexcept
{ return get() == pointer() ? false : true; }
// Modifiers.
/// Release ownership of any stored pointer.
pointer
release() noexcept
{ return _M_t.release(); }
/** @brief Replace the stored pointer.
*
* @param __p The new pointer to store.
*
* The deleter will be invoked if a pointer is already owned.
*/
template ,
__and_,
is_pointer<_Up>,
is_convertible<
typename remove_pointer<_Up>::type(*)[],
element_type(*)[]
>
>
>
>>
void
reset(_Up __p) noexcept
{ _M_t.reset(std::move(__p)); }
void reset(nullptr_t = nullptr) noexcept
{ reset(pointer()); }
/// Exchange the pointer and deleter with another object.
void
swap(unique_ptr& __u) noexcept
{
static_assert(__is_swappable<_Dp>::value, "deleter must be swappable");
_M_t.swap(__u._M_t);
}
// Disable copy from lvalue.
unique_ptr(const unique_ptr&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
};
/// @relates unique_ptr @{
/// Swap overload for unique_ptr
template
inline
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
// Constrained free swap overload, see p0185r1
typename enable_if<__is_swappable<_Dp>::value>::type
#else
void
#endif
swap(unique_ptr<_Tp, _Dp>& __x,
unique_ptr<_Tp, _Dp>& __y) noexcept
{ __x.swap(__y); }
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
template
typename enable_if::value>::type
swap(unique_ptr<_Tp, _Dp>&,
unique_ptr<_Tp, _Dp>&) = delete;
#endif
/// Equality operator for unique_ptr objects, compares the owned pointers
template
_GLIBCXX_NODISCARD inline bool
operator==(const unique_ptr<_Tp, _Dp>& __x,
const unique_ptr<_Up, _Ep>& __y)
{ return __x.get() == __y.get(); }
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
{ return !__x; }
#ifndef __cpp_lib_three_way_comparison
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
{ return !__x; }
/// Inequality operator for unique_ptr objects, compares the owned pointers
template
_GLIBCXX_NODISCARD inline bool
operator!=(const unique_ptr<_Tp, _Dp>& __x,
const unique_ptr<_Up, _Ep>& __y)
{ return __x.get() != __y.get(); }
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
{ return (bool)__x; }
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
{ return (bool)__x; }
#endif // three way comparison
/// Relational operator for unique_ptr objects, compares the owned pointers
template
_GLIBCXX_NODISCARD inline bool
operator<(const unique_ptr<_Tp, _Dp>& __x,
const unique_ptr<_Up, _Ep>& __y)
{
typedef typename
std::common_type::pointer,
typename unique_ptr<_Up, _Ep>::pointer>::type _CT;
return std::less<_CT>()(__x.get(), __y.get());
}
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator<(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
{
return std::less::pointer>()(__x.get(),
nullptr);
}
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator<(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
{
return std::less::pointer>()(nullptr,
__x.get());
}
/// Relational operator for unique_ptr objects, compares the owned pointers
template
_GLIBCXX_NODISCARD inline bool
operator<=(const unique_ptr<_Tp, _Dp>& __x,
const unique_ptr<_Up, _Ep>& __y)
{ return !(__y < __x); }
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator<=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
{ return !(nullptr < __x); }
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator<=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
{ return !(__x < nullptr); }
/// Relational operator for unique_ptr objects, compares the owned pointers
template
_GLIBCXX_NODISCARD inline bool
operator>(const unique_ptr<_Tp, _Dp>& __x,
const unique_ptr<_Up, _Ep>& __y)
{ return (__y < __x); }
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
{
return std::less::pointer>()(nullptr,
__x.get());
}
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator>(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
{
return std::less::pointer>()(__x.get(),
nullptr);
}
/// Relational operator for unique_ptr objects, compares the owned pointers
template
_GLIBCXX_NODISCARD inline bool
operator>=(const unique_ptr<_Tp, _Dp>& __x,
const unique_ptr<_Up, _Ep>& __y)
{ return !(__x < __y); }
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator>=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
{ return !(__x < nullptr); }
/// unique_ptr comparison with nullptr
template
_GLIBCXX_NODISCARD inline bool
operator>=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
{ return !(nullptr < __x); }
#ifdef __cpp_lib_three_way_comparison
template
requires three_way_comparable_with::pointer,
typename unique_ptr<_Up, _Ep>::pointer>
inline
compare_three_way_result_t::pointer,
typename unique_ptr<_Up, _Ep>::pointer>
operator<=>(const unique_ptr<_Tp, _Dp>& __x,
const unique_ptr<_Up, _Ep>& __y)
{ return compare_three_way()(__x.get(), __y.get()); }
template
requires three_way_comparable::pointer>
inline
compare_three_way_result_t::pointer>
operator<=>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
{
using pointer = typename unique_ptr<_Tp, _Dp>::pointer;
return compare_three_way()(__x.get(), static_cast(nullptr));
}
#endif
/// @} relates unique_ptr
/// @cond undocumented
template::__enable_hash_call>
struct __uniq_ptr_hash
#if ! _GLIBCXX_INLINE_VERSION
: private __poison_hash<_Ptr>
#endif
{
size_t
operator()(const _Up& __u) const
noexcept(noexcept(std::declval>()(std::declval<_Ptr>())))
{ return hash<_Ptr>()(__u.get()); }
};
template
struct __uniq_ptr_hash<_Up, _Ptr, false>
: private __poison_hash<_Ptr>
{ };
/// @endcond
/// std::hash specialization for unique_ptr.
template
struct hash>
: public __hash_base>,
public __uniq_ptr_hash>
{ };
#if __cplusplus >= 201402L
/// @relates unique_ptr @{
#define __cpp_lib_make_unique 201304
/// @cond undocumented
template
struct _MakeUniq
{ typedef unique_ptr<_Tp> __single_object; };
template
struct _MakeUniq<_Tp[]>
{ typedef unique_ptr<_Tp[]> __array; };
template
struct _MakeUniq<_Tp[_Bound]>
{ struct __invalid_type { }; };
/// @endcond
/// std::make_unique for single objects
template
inline typename _MakeUniq<_Tp>::__single_object
make_unique(_Args&&... __args)
{ return unique_ptr<_Tp>(new _Tp(std::forward<_Args>(__args)...)); }
/// std::make_unique for arrays of unknown bound
template
inline typename _MakeUniq<_Tp>::__array
make_unique(size_t __num)
{ return unique_ptr<_Tp>(new remove_extent_t<_Tp>[__num]()); }
/// Disable std::make_unique for arrays of known bound
template
typename _MakeUniq<_Tp>::__invalid_type
make_unique(_Args&&...) = delete;
#if __cplusplus > 201703L
/// std::make_unique_for_overwrite for single objects
template
inline typename _MakeUniq<_Tp>::__single_object
make_unique_for_overwrite()
{ return unique_ptr<_Tp>(new _Tp); }
/// std::make_unique_for_overwrite for arrays of unknown bound
template
inline typename _MakeUniq<_Tp>::__array
make_unique_for_overwrite(size_t __n)
{ return unique_ptr<_Tp>(new remove_extent_t<_Tp>[__n]); }
/// Disable std::make_unique_for_overwrite for arrays of known bound
template
typename _MakeUniq<_Tp>::__invalid_type
make_unique_for_overwrite(_Args&&...) = delete;
#endif // C++20
/// @} relates unique_ptr
#endif // C++14
#if __cplusplus > 201703L && __cpp_concepts
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2948. unique_ptr does not define operator<< for stream output
/// Stream output operator for unique_ptr
template
inline basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const unique_ptr<_Tp, _Dp>& __p)
requires requires { __os << __p.get(); }
{
__os << __p.get();
return __os;
}
#endif // C++20
/// @} group pointer_abstractions
#if __cplusplus >= 201703L
namespace __detail::__variant
{
template struct _Never_valueless_alt; // see
// Provide the strong exception-safety guarantee when emplacing a
// unique_ptr into a variant.
template
struct _Never_valueless_alt>
: std::true_type
{ };
} // namespace __detail::__variant
#endif // C++17
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif /* _UNIQUE_PTR_H */