mirror of git://gcc.gnu.org/git/gcc.git
313 lines
8.5 KiB
C++
313 lines
8.5 KiB
C++
// Node handles for containers -*- C++ -*-
|
|
|
|
// Copyright (C) 2016-2017 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
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
/** @file bits/node_handle.h
|
|
* This is an internal header file, included by other library headers.
|
|
* Do not attempt to use it directly.
|
|
* @headername{map,set,unordered_map,unordered_set}
|
|
*/
|
|
|
|
#ifndef _NODE_HANDLE
|
|
#define _NODE_HANDLE 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#if __cplusplus > 201402L
|
|
# define __cpp_lib_node_extract 201606
|
|
|
|
#include <optional>
|
|
#include <tuple>
|
|
#include <bits/alloc_traits.h>
|
|
#include <bits/ptr_traits.h>
|
|
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/// Base class for node handle types of maps and sets.
|
|
template<typename _Val, typename _NodeAlloc>
|
|
class _Node_handle_common
|
|
{
|
|
using _AllocTraits = allocator_traits<_NodeAlloc>;
|
|
|
|
public:
|
|
using allocator_type = __alloc_rebind<_NodeAlloc, _Val>;
|
|
|
|
allocator_type
|
|
get_allocator() const noexcept
|
|
{
|
|
__glibcxx_assert(!this->empty());
|
|
return allocator_type(*_M_alloc);
|
|
}
|
|
|
|
explicit operator bool() const noexcept { return _M_ptr != nullptr; }
|
|
|
|
bool empty() const noexcept { return _M_ptr == nullptr; }
|
|
|
|
protected:
|
|
constexpr _Node_handle_common() noexcept : _M_ptr(), _M_alloc() {}
|
|
|
|
~_Node_handle_common() { _M_destroy(); }
|
|
|
|
_Node_handle_common(_Node_handle_common&& __nh) noexcept
|
|
: _M_ptr(__nh._M_ptr), _M_alloc(std::move(__nh._M_alloc))
|
|
{
|
|
__nh._M_ptr = nullptr;
|
|
__nh._M_alloc = nullopt;
|
|
}
|
|
|
|
_Node_handle_common&
|
|
operator=(_Node_handle_common&& __nh) noexcept
|
|
{
|
|
_M_destroy();
|
|
_M_ptr = __nh._M_ptr;
|
|
if constexpr (is_move_assignable_v<_NodeAlloc>)
|
|
{
|
|
if (_AllocTraits::propagate_on_container_move_assignment::value
|
|
|| !this->_M_alloc)
|
|
this->_M_alloc = std::move(__nh._M_alloc);
|
|
else
|
|
__glibcxx_assert(this->_M_alloc == __nh._M_alloc);
|
|
}
|
|
else
|
|
__glibcxx_assert(_M_alloc);
|
|
__nh._M_ptr = nullptr;
|
|
__nh._M_alloc = nullopt;
|
|
return *this;
|
|
}
|
|
|
|
_Node_handle_common(typename _AllocTraits::pointer __ptr,
|
|
const _NodeAlloc& __alloc)
|
|
: _M_ptr(__ptr), _M_alloc(__alloc) { }
|
|
|
|
void
|
|
_M_swap(_Node_handle_common& __nh) noexcept
|
|
{
|
|
using std::swap;
|
|
swap(_M_ptr, __nh._M_ptr);
|
|
if (_AllocTraits::propagate_on_container_swap
|
|
|| !_M_alloc || !__nh._M_alloc)
|
|
_M_alloc.swap(__nh._M_alloc);
|
|
else
|
|
__glibcxx_assert(_M_alloc == __nh._M_alloc);
|
|
}
|
|
|
|
private:
|
|
void
|
|
_M_destroy() noexcept
|
|
{
|
|
if (_M_ptr != nullptr)
|
|
{
|
|
allocator_type __alloc(*_M_alloc);
|
|
allocator_traits<allocator_type>::destroy(__alloc,
|
|
_M_ptr->_M_valptr());
|
|
_AllocTraits::deallocate(*_M_alloc, _M_ptr, 1);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
typename _AllocTraits::pointer _M_ptr;
|
|
private:
|
|
optional<_NodeAlloc> _M_alloc;
|
|
|
|
template<typename _Key2, typename _Value2, typename _KeyOfValue,
|
|
typename _Compare, typename _ValueAlloc>
|
|
friend class _Rb_tree;
|
|
};
|
|
|
|
/// Node handle type for maps.
|
|
template<typename _Key, typename _Value, typename _NodeAlloc>
|
|
class _Node_handle : public _Node_handle_common<_Value, _NodeAlloc>
|
|
{
|
|
public:
|
|
constexpr _Node_handle() noexcept = default;
|
|
~_Node_handle() = default;
|
|
_Node_handle(_Node_handle&&) noexcept = default;
|
|
|
|
_Node_handle&
|
|
operator=(_Node_handle&&) noexcept = default;
|
|
|
|
using key_type = _Key;
|
|
using mapped_type = typename _Value::second_type;
|
|
|
|
key_type&
|
|
key() const noexcept
|
|
{
|
|
__glibcxx_assert(!this->empty());
|
|
return *_M_pkey;
|
|
}
|
|
|
|
mapped_type&
|
|
mapped() const noexcept
|
|
{
|
|
__glibcxx_assert(!this->empty());
|
|
return *_M_pmapped;
|
|
}
|
|
|
|
void
|
|
swap(_Node_handle& __nh) noexcept
|
|
{
|
|
this->_M_swap(__nh);
|
|
using std::swap;
|
|
swap(_M_pkey, __nh._M_pkey);
|
|
swap(_M_pmapped, __nh._M_pmapped);
|
|
}
|
|
|
|
friend void
|
|
swap(_Node_handle& __x, _Node_handle& __y)
|
|
noexcept(noexcept(__x.swap(__y)))
|
|
{ __x.swap(__y); }
|
|
|
|
private:
|
|
using _AllocTraits = allocator_traits<_NodeAlloc>;
|
|
|
|
_Node_handle(typename _AllocTraits::pointer __ptr,
|
|
const _NodeAlloc& __alloc)
|
|
: _Node_handle_common<_Value, _NodeAlloc>(__ptr, __alloc)
|
|
{
|
|
if (__ptr)
|
|
{
|
|
auto& __key = const_cast<_Key&>(__ptr->_M_valptr()->first);
|
|
_M_pkey = _S_pointer_to(__key);
|
|
_M_pmapped = _S_pointer_to(__ptr->_M_valptr()->second);
|
|
}
|
|
else
|
|
{
|
|
_M_pkey = nullptr;
|
|
_M_pmapped = nullptr;
|
|
}
|
|
}
|
|
|
|
template<typename _Tp>
|
|
using __pointer = __ptr_rebind<typename _AllocTraits::pointer, _Tp>;
|
|
|
|
__pointer<_Key> _M_pkey = nullptr;
|
|
__pointer<typename _Value::second_type> _M_pmapped = nullptr;
|
|
|
|
template<typename _Tp>
|
|
__pointer<_Tp>
|
|
_S_pointer_to(_Tp& __obj)
|
|
{ return pointer_traits<__pointer<_Tp>>::pointer_to(__obj); }
|
|
|
|
const key_type&
|
|
_M_key() const noexcept { return key(); }
|
|
|
|
template<typename _Key2, typename _Value2, typename _KeyOfValue,
|
|
typename _Compare, typename _ValueAlloc>
|
|
friend class _Rb_tree;
|
|
|
|
template<typename _Key2, typename _Value2, typename _ValueAlloc,
|
|
typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash,
|
|
typename _RehashPolicy, typename _Traits>
|
|
friend class _Hashtable;
|
|
};
|
|
|
|
/// Node handle type for sets.
|
|
template<typename _Value, typename _NodeAlloc>
|
|
class _Node_handle<_Value, _Value, _NodeAlloc>
|
|
: public _Node_handle_common<_Value, _NodeAlloc>
|
|
{
|
|
public:
|
|
constexpr _Node_handle() noexcept = default;
|
|
~_Node_handle() = default;
|
|
_Node_handle(_Node_handle&&) noexcept = default;
|
|
|
|
_Node_handle&
|
|
operator=(_Node_handle&&) noexcept = default;
|
|
|
|
using value_type = _Value;
|
|
|
|
value_type&
|
|
value() const noexcept
|
|
{
|
|
__glibcxx_assert(!this->empty());
|
|
return *this->_M_ptr->_M_valptr();
|
|
}
|
|
|
|
void
|
|
swap(_Node_handle& __nh) noexcept
|
|
{ this->_M_swap(__nh); }
|
|
|
|
friend void
|
|
swap(_Node_handle& __x, _Node_handle& __y)
|
|
noexcept(noexcept(__x.swap(__y)))
|
|
{ __x.swap(__y); }
|
|
|
|
private:
|
|
using _AllocTraits = allocator_traits<_NodeAlloc>;
|
|
|
|
_Node_handle(typename _AllocTraits::pointer __ptr,
|
|
const _NodeAlloc& __alloc)
|
|
: _Node_handle_common<_Value, _NodeAlloc>(__ptr, __alloc) { }
|
|
|
|
const value_type&
|
|
_M_key() const noexcept { return value(); }
|
|
|
|
template<typename _Key, typename _Val, typename _KeyOfValue,
|
|
typename _Compare, typename _Alloc>
|
|
friend class _Rb_tree;
|
|
|
|
template<typename _Key2, typename _Value2, typename _ValueAlloc,
|
|
typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash,
|
|
typename _RehashPolicy, typename _Traits>
|
|
friend class _Hashtable;
|
|
};
|
|
|
|
/// Return type of insert(node_handle&&) on unique maps/sets.
|
|
template<typename _Iterator, typename _NodeHandle>
|
|
struct _Node_insert_return
|
|
{
|
|
_Iterator position = _Iterator();
|
|
bool inserted = false;
|
|
_NodeHandle node;
|
|
|
|
template<size_t _Idx>
|
|
decltype(auto) get() &
|
|
{ return std::get<_Idx>(std::tie(inserted, position, node)); }
|
|
|
|
template<size_t _Idx>
|
|
decltype(auto) get() const &
|
|
{ return std::get<_Idx>(std::tie(inserted, position, node)); }
|
|
|
|
template<size_t _Idx>
|
|
decltype(auto) get() &&
|
|
{
|
|
return std::move(std::get<_Idx>(std::tie(inserted, position, node)));
|
|
}
|
|
|
|
template<size_t _Idx>
|
|
decltype(auto) get() const &&
|
|
{
|
|
return std::move(std::get<_Idx>(std::tie(inserted, position, node)));
|
|
}
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#endif // C++17
|
|
#endif
|