FM / bits

/usr/include/c++/8/bits

Name	Size	Mode	Actions
algorithmfwd.h	21736	0644	edit dl rm
allocated_ptr.h	3293	0644	edit dl rm
allocator.h	7569	0644	edit dl rm
alloc_traits.h	20066	0644	edit dl rm
atomic_base.h	23842	0644	edit dl rm
atomic_futex.h	9576	0644	edit dl rm
atomic_lockfree_defines.h	2253	0644	edit dl rm
basic_ios.h	16074	0644	edit dl rm
basic_ios.tcc	6083	0644	edit dl rm
basic_string.h	242697	0644	edit dl rm
basic_string.tcc	53755	0644	edit dl rm
boost_concept_check.h	27161	0644	edit dl rm
c++0x_warning.h	1474	0644	edit dl rm
char_traits.h	20915	0644	edit dl rm
codecvt.h	21289	0644	edit dl rm
concept_check.h	3423	0644	edit dl rm
cpp_type_traits.h	9789	0644	edit dl rm
cxxabi_forced.h	1811	0644	edit dl rm
cxxabi_init_exception.h	2220	0644	edit dl rm
deque.tcc	34122	0644	edit dl rm
enable_special_members.h	12387	0644	edit dl rm
exception.h	2280	0644	edit dl rm
exception_defines.h	1645	0644	edit dl rm
exception_ptr.h	5981	0644	edit dl rm
forward_list.h	48919	0644	edit dl rm
forward_list.tcc	13169	0644	edit dl rm
fstream.tcc	32799	0644	edit dl rm
fs_dir.h	14724	0644	edit dl rm
fs_fwd.h	10279	0644	edit dl rm
fs_ops.h	9730	0644	edit dl rm
fs_path.h	32894	0644	edit dl rm
functexcept.h	3254	0644	edit dl rm
functional_hash.h	8238	0644	edit dl rm
gslice.h	5518	0644	edit dl rm
gslice_array.h	7769	0644	edit dl rm
hashtable.h	73785	0644	edit dl rm
hashtable_policy.h	67971	0644	edit dl rm
hash_bytes.h	2146	0644	edit dl rm
indirect_array.h	7861	0644	edit dl rm
invoke.h	3657	0644	edit dl rm
ios_base.h	31023	0644	edit dl rm
istream.tcc	31093	0644	edit dl rm
list.tcc	15976	0644	edit dl rm
localefwd.h	5646	0644	edit dl rm
locale_classes.h	24897	0644	edit dl rm
locale_classes.tcc	8375	0644	edit dl rm
locale_conv.h	16097	0644	edit dl rm
locale_facets.h	92328	0644	edit dl rm
locale_facets.tcc	39548	0644	edit dl rm
locale_facets_nonio.h	68980	0644	edit dl rm
locale_facets_nonio.tcc	45280	0644	edit dl rm
mask_array.h	7595	0644	edit dl rm
memoryfwd.h	2453	0644	edit dl rm
move.h	6529	0644	edit dl rm
nested_exception.h	4802	0644	edit dl rm
node_handle.h	8216	0644	edit dl rm
ostream.tcc	12315	0644	edit dl rm
ostream_insert.h	4002	0644	edit dl rm
parse_numbers.h	7944	0644	edit dl rm
postypes.h	8208	0644	edit dl rm
predefined_ops.h	9083	0644	edit dl rm
ptr_traits.h	6626	0644	edit dl rm
quoted_string.h	5053	0644	edit dl rm
random.h	175250	0644	edit dl rm
random.tcc	105590	0644	edit dl rm
range_access.h	10030	0644	edit dl rm
refwrap.h	11884	0644	edit dl rm
regex.h	97402	0644	edit dl rm
regex.tcc	16565	0644	edit dl rm
regex_automaton.h	10722	0644	edit dl rm
regex_automaton.tcc	7838	0644	edit dl rm
regex_compiler.h	18050	0644	edit dl rm
regex_compiler.tcc	19288	0644	edit dl rm
regex_constants.h	14708	0644	edit dl rm
regex_error.h	4904	0644	edit dl rm
regex_executor.h	7488	0644	edit dl rm
regex_executor.tcc	18841	0644	edit dl rm
regex_scanner.h	7088	0644	edit dl rm
regex_scanner.tcc	15009	0644	edit dl rm
shared_ptr.h	23433	0644	edit dl rm
shared_ptr_atomic.h	9769	0644	edit dl rm
shared_ptr_base.h	54286	0644	edit dl rm
slice_array.h	9348	0644	edit dl rm
specfun.h	47051	0644	edit dl rm
sstream.tcc	10142	0644	edit dl rm
std_abs.h	3266	0644	edit dl rm
std_function.h	23260	0644	edit dl rm
std_mutex.h	9298	0644	edit dl rm
stl_algo.h	214294	0644	edit dl rm
stl_algobase.h	50494	0644	edit dl rm
stl_bvector.h	33728	0644	edit dl rm
stl_construct.h	7397	0644	edit dl rm
stl_deque.h	78575	0644	edit dl rm
stl_function.h	41745	0644	edit dl rm
stl_heap.h	20206	0644	edit dl rm
stl_iterator.h	42291	0644	edit dl rm
stl_iterator_base_funcs.h	8178	0644	edit dl rm
stl_iterator_base_types.h	8680	0644	edit dl rm
stl_list.h	67558	0644	edit dl rm
stl_map.h	52791	0644	edit dl rm
stl_multimap.h	41557	0644	edit dl rm
stl_multiset.h	35809	0644	edit dl rm
stl_numeric.h	13832	0644	edit dl rm
stl_pair.h	18642	0644	edit dl rm
stl_queue.h	24073	0644	edit dl rm
stl_raw_storage_iter.h	3830	0644	edit dl rm
stl_relops.h	4594	0644	edit dl rm
stl_set.h	36125	0644	edit dl rm
stl_stack.h	11938	0644	edit dl rm
stl_tempbuf.h	8344	0644	edit dl rm
stl_tree.h	74904	0644	edit dl rm
stl_uninitialized.h	27709	0644	edit dl rm
stl_vector.h	60534	0644	edit dl rm
streambuf.tcc	4929	0644	edit dl rm
streambuf_iterator.h	13758	0644	edit dl rm
stream_iterator.h	6654	0644	edit dl rm
stringfwd.h	2607	0644	edit dl rm
string_view.tcc	6698	0644	edit dl rm
uniform_int_dist.h	10081	0644	edit dl rm
unique_ptr.h	25984	0644	edit dl rm
unordered_map.h	75341	0644	edit dl rm
unordered_set.h	59148	0644	edit dl rm
uses_allocator.h	6525	0644	edit dl rm
valarray_after.h	22655	0644	edit dl rm
valarray_array.h	21807	0644	edit dl rm
valarray_array.tcc	7254	0644	edit dl rm
valarray_before.h	18513	0644	edit dl rm
vector.tcc	29644	0644	edit dl rm

Edit: /usr/include/c++/8/bits/node_handle.h (8216B)

// Node handles for containers -*- C++ -*-

// Copyright (C) 2016-2018 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 <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; }

[[nodiscard]] 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::value
	    || !_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,
			 remove_reference_t<_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;

/// 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;
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // C++17
#endif

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