FM / bits

/usr/include/c++/11/bits

Name	Size	Mode	Actions
algorithmfwd.h	24547	0644	edit dl rm
align.h	3711	0644	edit dl rm
allocated_ptr.h	3329	0644	edit dl rm
allocator.h	9737	0644	edit dl rm
alloc_traits.h	27632	0644	edit dl rm
atomic_base.h	57414	0644	edit dl rm
atomic_futex.h	12394	0644	edit dl rm
atomic_lockfree_defines.h	2353	0644	edit dl rm
atomic_timed_wait.h	13530	0644	edit dl rm
atomic_wait.h	12557	0644	edit dl rm
basic_ios.h	16080	0644	edit dl rm
basic_ios.tcc	6083	0644	edit dl rm
basic_string.h	251944	0644	edit dl rm
basic_string.tcc	54189	0644	edit dl rm
boost_concept_check.h	27182	0644	edit dl rm
c++0x_warning.h	1474	0644	edit dl rm
charconv.h	3435	0644	edit dl rm
char_traits.h	29350	0644	edit dl rm
codecvt.h	25500	0644	edit dl rm
concept_check.h	3423	0644	edit dl rm
cpp_type_traits.h	14003	0644	edit dl rm
cxxabi_forced.h	1811	0644	edit dl rm
cxxabi_init_exception.h	2220	0644	edit dl rm
deque.tcc	42361	0644	edit dl rm
enable_special_members.h	12452	0644	edit dl rm
erase_if.h	2066	0644	edit dl rm
exception.h	2504	0644	edit dl rm
exception_defines.h	1645	0644	edit dl rm
exception_ptr.h	7640	0644	edit dl rm
forward_list.h	50387	0644	edit dl rm
forward_list.tcc	14035	0644	edit dl rm
fstream.tcc	33672	0644	edit dl rm
fs_dir.h	16409	0644	edit dl rm
fs_fwd.h	10771	0644	edit dl rm
fs_ops.h	10739	0644	edit dl rm
fs_path.h	39745	0644	edit dl rm
functexcept.h	3509	0644	edit dl rm
functional_hash.h	8591	0644	edit dl rm
gslice.h	5519	0644	edit dl rm
gslice_array.h	7892	0644	edit dl rm
hashtable.h	84951	0644	edit dl rm
hashtable_policy.h	62156	0644	edit dl rm
hash_bytes.h	2146	0644	edit dl rm
indirect_array.h	7902	0644	edit dl rm
invoke.h	6059	0644	edit dl rm
ios_base.h	31934	0644	edit dl rm
istream.tcc	31595	0644	edit dl rm
iterator_concepts.h	33335	0644	edit dl rm
list.tcc	17201	0644	edit dl rm
localefwd.h	5943	0644	edit dl rm
locale_classes.h	25044	0644	edit dl rm
locale_classes.tcc	8375	0644	edit dl rm
locale_conv.h	18822	0644	edit dl rm
locale_facets.h	93655	0644	edit dl rm
locale_facets.tcc	40463	0644	edit dl rm
locale_facets_nonio.h	69704	0644	edit dl rm
locale_facets_nonio.tcc	47533	0644	edit dl rm
mask_array.h	7716	0644	edit dl rm
max_size_type.h	22715	0644	edit dl rm
memoryfwd.h	2504	0644	edit dl rm
move.h	6798	0644	edit dl rm
nested_exception.h	4887	0644	edit dl rm
node_handle.h	10920	0644	edit dl rm
ostream.tcc	12315	0644	edit dl rm
ostream_insert.h	4038	0644	edit dl rm
parse_numbers.h	7980	0644	edit dl rm
postypes.h	8465	0644	edit dl rm
predefined_ops.h	10177	0644	edit dl rm
ptr_traits.h	6708	0644	edit dl rm
quoted_string.h	5053	0644	edit dl rm
random.h	178359	0644	edit dl rm
random.tcc	105688	0644	edit dl rm
ranges_algo.h	116831	0644	edit dl rm
ranges_algobase.h	18871	0644	edit dl rm
ranges_base.h	24392	0644	edit dl rm
ranges_cmp.h	6017	0644	edit dl rm
ranges_uninitialized.h	18130	0644	edit dl rm
ranges_util.h	20591	0644	edit dl rm
range_access.h	10707	0644	edit dl rm
refwrap.h	13208	0644	edit dl rm
regex.h	103969	0644	edit dl rm
regex.tcc	16492	0644	edit dl rm
regex_automaton.h	10788	0644	edit dl rm
regex_automaton.tcc	7722	0644	edit dl rm
regex_compiler.h	16219	0644	edit dl rm
regex_compiler.tcc	19158	0644	edit dl rm
regex_constants.h	15549	0644	edit dl rm
regex_error.h	5015	0644	edit dl rm
regex_executor.h	8852	0644	edit dl rm
regex_executor.tcc	18837	0644	edit dl rm
regex_scanner.h	7047	0644	edit dl rm
regex_scanner.tcc	15249	0644	edit dl rm
semaphore_base.h	7936	0644	edit dl rm
shared_ptr.h	30981	0644	edit dl rm
shared_ptr_atomic.h	9874	0644	edit dl rm
shared_ptr_base.h	54907	0644	edit dl rm
slice_array.h	9619	0644	edit dl rm
specfun.h	47240	0644	edit dl rm
sstream.tcc	10148	0644	edit dl rm
std_abs.h	3384	0644	edit dl rm
std_function.h	22863	0644	edit dl rm
std_mutex.h	6443	0644	edit dl rm
std_thread.h	8589	0644	edit dl rm
stl_algo.h	214703	0644	edit dl rm
stl_algobase.h	76254	0644	edit dl rm
stl_bvector.h	35574	0644	edit dl rm
stl_construct.h	8800	0644	edit dl rm
stl_deque.h	76970	0644	edit dl rm
stl_function.h	43897	0644	edit dl rm
stl_heap.h	20756	0644	edit dl rm
stl_iterator.h	78851	0644	edit dl rm
stl_iterator_base_funcs.h	8178	0644	edit dl rm
stl_iterator_base_types.h	9662	0644	edit dl rm
stl_list.h	69779	0644	edit dl rm
stl_map.h	54693	0644	edit dl rm
stl_multimap.h	43534	0644	edit dl rm
stl_multiset.h	37675	0644	edit dl rm
stl_numeric.h	14601	0644	edit dl rm
stl_pair.h	20135	0644	edit dl rm
stl_queue.h	25036	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	37939	0644	edit dl rm
stl_stack.h	12684	0644	edit dl rm
stl_tempbuf.h	8655	0644	edit dl rm
stl_tree.h	73922	0644	edit dl rm
stl_uninitialized.h	34013	0644	edit dl rm
stl_vector.h	65919	0644	edit dl rm
streambuf.tcc	4929	0644	edit dl rm
streambuf_iterator.h	15532	0644	edit dl rm
stream_iterator.h	7697	0644	edit dl rm
stringfwd.h	2690	0644	edit dl rm
string_view.tcc	7167	0644	edit dl rm
this_thread_sleep.h	3307	0644	edit dl rm
uniform_int_dist.h	13052	0644	edit dl rm
unique_lock.h	6143	0644	edit dl rm
unique_ptr.h	32537	0644	edit dl rm
unordered_map.h	76669	0644	edit dl rm
unordered_set.h	62934	0644	edit dl rm
uses_allocator.h	6906	0644	edit dl rm
uses_allocator_args.h	7562	0644	edit dl rm
valarray_after.h	23283	0644	edit dl rm
valarray_array.h	21295	0644	edit dl rm
valarray_array.tcc	7254	0644	edit dl rm
valarray_before.h	19142	0644	edit dl rm
vector.tcc	30985	0644	edit dl rm

Edit: /usr/include/c++/11/bits/ranges_uninitialized.h (18130B)

// Raw memory manipulators -*- C++ -*-

// Copyright (C) 2020-2021 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
// <http://www.gnu.org/licenses/>.

/** @file bits/ranges_uninitialized.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{memory}
 */

#ifndef _RANGES_UNINITIALIZED_H
#define _RANGES_UNINITIALIZED_H 1

#if __cplusplus > 201703L
#if __cpp_lib_concepts

#include <bits/ranges_algobase.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace ranges
{
  namespace __detail
  {
    template<typename _Tp>
      constexpr void*
      __voidify(_Tp& __obj) noexcept
      {
	return const_cast<void*>
		 (static_cast<const volatile void*>(std::__addressof(__obj)));
      }

template<typename _Iter>
      concept __nothrow_input_iterator
	= (input_iterator<_Iter>
	   && is_lvalue_reference_v<iter_reference_t<_Iter>>
	   && same_as<remove_cvref_t<iter_reference_t<_Iter>>,
		      iter_value_t<_Iter>>);

template<typename _Sent, typename _Iter>
      concept __nothrow_sentinel = sentinel_for<_Sent, _Iter>;

template<typename _Range>
      concept __nothrow_input_range
	= (range<_Range>
	   && __nothrow_input_iterator<iterator_t<_Range>>
	   && __nothrow_sentinel<sentinel_t<_Range>, iterator_t<_Range>>);

template<typename _Iter>
      concept __nothrow_forward_iterator
	= (__nothrow_input_iterator<_Iter>
	   && forward_iterator<_Iter>
	   && __nothrow_sentinel<_Iter, _Iter>);

template<typename _Range>
      concept __nothrow_forward_range
	= (__nothrow_input_range<_Range>
	   && __nothrow_forward_iterator<iterator_t<_Range>>);
  } // namespace __detail

struct __destroy_fn
  {
    template<__detail::__nothrow_input_iterator _Iter,
	     __detail::__nothrow_sentinel<_Iter> _Sent>
      requires destructible<iter_value_t<_Iter>>
      constexpr _Iter
      operator()(_Iter __first, _Sent __last) const noexcept;

template<__detail::__nothrow_input_range _Range>
      requires destructible<range_value_t<_Range>>
      constexpr borrowed_iterator_t<_Range>
      operator()(_Range&& __r) const noexcept;
  };

inline constexpr __destroy_fn destroy{};

namespace __detail
  {
    template<typename _Iter>
      requires destructible<iter_value_t<_Iter>>
      struct _DestroyGuard
      {
      private:
	_Iter _M_first;
	const _Iter* _M_cur;

public:
	explicit
	_DestroyGuard(const _Iter& __iter)
	  : _M_first(__iter), _M_cur(std::__addressof(__iter))
	{ }

void
	release() noexcept
	{ _M_cur = nullptr; }

~_DestroyGuard()
	{
	  if (_M_cur != nullptr)
	    ranges::destroy(std::move(_M_first), *_M_cur);
	}
      };

template<typename _Iter>
      requires destructible<iter_value_t<_Iter>>
	&& is_trivially_destructible_v<iter_value_t<_Iter>>
      struct _DestroyGuard<_Iter>
      {
	explicit
	_DestroyGuard(const _Iter&)
	{ }

void
	release() noexcept
	{ }
      };
  } // namespace __detail

struct __uninitialized_default_construct_fn
  {
    template<__detail::__nothrow_forward_iterator _Iter,
	     __detail::__nothrow_sentinel<_Iter> _Sent>
      requires default_initializable<iter_value_t<_Iter>>
      _Iter
      operator()(_Iter __first, _Sent __last) const
      {
	using _ValueType = remove_reference_t<iter_reference_t<_Iter>>;
	if constexpr (is_trivially_default_constructible_v<_ValueType>)
	  return ranges::next(__first, __last);
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__first);
	    for (; __first != __last; ++__first)
	      ::new (__detail::__voidify(*__first)) _ValueType;
	    __guard.release();
	    return __first;
	  }
      }

template<__detail::__nothrow_forward_range _Range>
      requires default_initializable<range_value_t<_Range>>
      borrowed_iterator_t<_Range>
      operator()(_Range&& __r) const
      {
	return (*this)(ranges::begin(__r), ranges::end(__r));
      }
  };

inline constexpr __uninitialized_default_construct_fn
    uninitialized_default_construct{};

struct __uninitialized_default_construct_n_fn
  {
    template<__detail::__nothrow_forward_iterator _Iter>
      requires default_initializable<iter_value_t<_Iter>>
      _Iter
      operator()(_Iter __first, iter_difference_t<_Iter> __n) const
      {
	using _ValueType = remove_reference_t<iter_reference_t<_Iter>>;
	if constexpr (is_trivially_default_constructible_v<_ValueType>)
	  return ranges::next(__first, __n);
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__first);
	    for (; __n > 0; ++__first, (void) --__n)
	      ::new (__detail::__voidify(*__first)) _ValueType;
	    __guard.release();
	    return __first;
	  }
      }
  };

inline constexpr __uninitialized_default_construct_n_fn
    uninitialized_default_construct_n;

struct __uninitialized_value_construct_fn
  {
    template<__detail::__nothrow_forward_iterator _Iter,
	     __detail::__nothrow_sentinel<_Iter> _Sent>
      requires default_initializable<iter_value_t<_Iter>>
      _Iter
      operator()(_Iter __first, _Sent __last) const
      {
	using _ValueType = remove_reference_t<iter_reference_t<_Iter>>;
	if constexpr (is_trivial_v<_ValueType>
		      && is_copy_assignable_v<_ValueType>)
	  return ranges::fill(__first, __last, _ValueType());
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__first);
	    for (; __first != __last; ++__first)
	      ::new (__detail::__voidify(*__first)) _ValueType();
	    __guard.release();
	    return __first;
	  }
      }

inline constexpr __uninitialized_value_construct_fn
    uninitialized_value_construct{};

struct __uninitialized_value_construct_n_fn
  {
    template<__detail::__nothrow_forward_iterator _Iter>
      requires default_initializable<iter_value_t<_Iter>>
      _Iter
      operator()(_Iter __first, iter_difference_t<_Iter> __n) const
      {
	using _ValueType = remove_reference_t<iter_reference_t<_Iter>>;
	if constexpr (is_trivial_v<_ValueType>
		      && is_copy_assignable_v<_ValueType>)
	  return ranges::fill_n(__first, __n, _ValueType());
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__first);
	    for (; __n > 0; ++__first, (void) --__n)
	      ::new (__detail::__voidify(*__first)) _ValueType();
	    __guard.release();
	    return __first;
	  }
      }
  };

inline constexpr __uninitialized_value_construct_n_fn
    uninitialized_value_construct_n;

template<typename _Iter, typename _Out>
    using uninitialized_copy_result = in_out_result<_Iter, _Out>;

struct __uninitialized_copy_fn
  {
    template<input_iterator _Iter, sentinel_for<_Iter> _ISent,
	     __detail::__nothrow_forward_iterator _Out,
	     __detail::__nothrow_sentinel<_Out> _OSent>
      requires constructible_from<iter_value_t<_Out>, iter_reference_t<_Iter>>
      uninitialized_copy_result<_Iter, _Out>
      operator()(_Iter __ifirst, _ISent __ilast,
		 _Out __ofirst, _OSent __olast) const
      {
	using _OutType = remove_reference_t<iter_reference_t<_Out>>;
	if constexpr (sized_sentinel_for<_ISent, _Iter>
		      && sized_sentinel_for<_OSent, _Out>
		      && is_trivial_v<_OutType>
		      && is_nothrow_assignable_v<_OutType&,
						 iter_reference_t<_Iter>>)
	  {
	    auto __d1 = __ilast - __ifirst;
	    auto __d2 = __olast - __ofirst;
	    return ranges::copy_n(std::move(__ifirst), std::min(__d1, __d2),
				  __ofirst);
	  }
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__ofirst);
	    for (; __ifirst != __ilast && __ofirst != __olast;
		 ++__ofirst, (void)++__ifirst)
	      ::new (__detail::__voidify(*__ofirst)) _OutType(*__ifirst);
	    __guard.release();
	    return {std::move(__ifirst), __ofirst};
	  }
      }

template<input_range _IRange, __detail::__nothrow_forward_range _ORange>
      requires constructible_from<range_value_t<_ORange>,
				  range_reference_t<_IRange>>
      uninitialized_copy_result<borrowed_iterator_t<_IRange>,
				borrowed_iterator_t<_ORange>>
      operator()(_IRange&& __inr, _ORange&& __outr) const
      {
	return (*this)(ranges::begin(__inr), ranges::end(__inr),
		       ranges::begin(__outr), ranges::end(__outr));
      }
  };

inline constexpr __uninitialized_copy_fn uninitialized_copy{};

template<typename _Iter, typename _Out>
    using uninitialized_copy_n_result = in_out_result<_Iter, _Out>;

struct __uninitialized_copy_n_fn
  {
    template<input_iterator _Iter, __detail::__nothrow_forward_iterator _Out,
	     __detail::__nothrow_sentinel<_Out> _Sent>
      requires constructible_from<iter_value_t<_Out>, iter_reference_t<_Iter>>
      uninitialized_copy_n_result<_Iter, _Out>
      operator()(_Iter __ifirst, iter_difference_t<_Iter> __n,
		 _Out __ofirst, _Sent __olast) const
      {
	using _OutType = remove_reference_t<iter_reference_t<_Out>>;
	if constexpr (sized_sentinel_for<_Sent, _Out>
		      && is_trivial_v<_OutType>
		      && is_nothrow_assignable_v<_OutType&,
						 iter_reference_t<_Iter>>)
	  {
	    auto __d = __olast - __ofirst;
	    return ranges::copy_n(std::move(__ifirst), std::min(__n, __d),
				  __ofirst);
	  }
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__ofirst);
	    for (; __n > 0 && __ofirst != __olast;
		 ++__ofirst, (void)++__ifirst, (void)--__n)
	      ::new (__detail::__voidify(*__ofirst)) _OutType(*__ifirst);
	    __guard.release();
	    return {std::move(__ifirst), __ofirst};
	  }
      }
  };

inline constexpr __uninitialized_copy_n_fn uninitialized_copy_n{};

template<typename _Iter, typename _Out>
    using uninitialized_move_result = in_out_result<_Iter, _Out>;

struct __uninitialized_move_fn
  {
    template<input_iterator _Iter, sentinel_for<_Iter> _ISent,
	     __detail::__nothrow_forward_iterator _Out,
	     __detail::__nothrow_sentinel<_Out> _OSent>
      requires constructible_from<iter_value_t<_Out>,
				  iter_rvalue_reference_t<_Iter>>
      uninitialized_move_result<_Iter, _Out>
      operator()(_Iter __ifirst, _ISent __ilast,
		 _Out __ofirst, _OSent __olast) const
      {
	using _OutType = remove_reference_t<iter_reference_t<_Out>>;
	if constexpr (sized_sentinel_for<_ISent, _Iter>
		      && sized_sentinel_for<_OSent, _Out>
		      && is_trivial_v<_OutType>
		      && is_nothrow_assignable_v<_OutType&,
						 iter_rvalue_reference_t<_Iter>>)
	  {
	    auto __d1 = __ilast - __ifirst;
	    auto __d2 = __olast - __ofirst;
	    auto [__in, __out]
	      = ranges::copy_n(std::make_move_iterator(std::move(__ifirst)),
			       std::min(__d1, __d2), __ofirst);
	    return {std::move(__in).base(), __out};
	  }
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__ofirst);
	    for (; __ifirst != __ilast && __ofirst != __olast;
		 ++__ofirst, (void)++__ifirst)
	      ::new (__detail::__voidify(*__ofirst))
		    _OutType(ranges::iter_move(__ifirst));
	    __guard.release();
	    return {std::move(__ifirst), __ofirst};
	  }
      }

template<input_range _IRange, __detail::__nothrow_forward_range _ORange>
      requires constructible_from<range_value_t<_ORange>,
	       range_rvalue_reference_t<_IRange>>
      uninitialized_move_result<borrowed_iterator_t<_IRange>,
				borrowed_iterator_t<_ORange>>
      operator()(_IRange&& __inr, _ORange&& __outr) const
      {
	return (*this)(ranges::begin(__inr), ranges::end(__inr),
		       ranges::begin(__outr), ranges::end(__outr));
      }
  };

inline constexpr __uninitialized_move_fn uninitialized_move{};

template<typename _Iter, typename _Out>
    using uninitialized_move_n_result = in_out_result<_Iter, _Out>;

struct __uninitialized_move_n_fn
  {
    template<input_iterator _Iter, __detail::__nothrow_forward_iterator _Out,
      __detail::__nothrow_sentinel<_Out> _Sent>
	requires constructible_from<iter_value_t<_Out>,
				    iter_rvalue_reference_t<_Iter>>
      uninitialized_move_n_result<_Iter, _Out>
      operator()(_Iter __ifirst, iter_difference_t<_Iter> __n,
		 _Out __ofirst, _Sent __olast) const
      {
	using _OutType = remove_reference_t<iter_reference_t<_Out>>;
	if constexpr (sized_sentinel_for<_Sent, _Out>
		      && is_trivial_v<_OutType>
		      && is_nothrow_assignable_v<_OutType&,
						 iter_rvalue_reference_t<_Iter>>)
	  {
	    auto __d = __olast - __ofirst;
	    auto [__in, __out]
	      = ranges::copy_n(std::make_move_iterator(std::move(__ifirst)),
			       std::min(__n, __d), __ofirst);
	    return {std::move(__in).base(), __out};
	  }
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__ofirst);
	    for (; __n > 0 && __ofirst != __olast;
		 ++__ofirst, (void)++__ifirst, (void)--__n)
	      ::new (__detail::__voidify(*__ofirst))
		    _OutType(ranges::iter_move(__ifirst));
	    __guard.release();
	    return {std::move(__ifirst), __ofirst};
	  }
      }
  };

inline constexpr __uninitialized_move_n_fn uninitialized_move_n{};

struct __uninitialized_fill_fn
  {
    template<__detail::__nothrow_forward_iterator _Iter,
	     __detail::__nothrow_sentinel<_Iter> _Sent, typename _Tp>
      requires constructible_from<iter_value_t<_Iter>, const _Tp&>
      _Iter
      operator()(_Iter __first, _Sent __last, const _Tp& __x) const
      {
	using _ValueType = remove_reference_t<iter_reference_t<_Iter>>;
	if constexpr (is_trivial_v<_ValueType>
		      && is_nothrow_assignable_v<_ValueType&, const _Tp&>)
	  return ranges::fill(__first, __last, __x);
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__first);
	    for (; __first != __last; ++__first)
	      ::new (__detail::__voidify(*__first)) _ValueType(__x);
	    __guard.release();
	    return __first;
	  }
      }

template<__detail::__nothrow_forward_range _Range, typename _Tp>
      requires constructible_from<range_value_t<_Range>, const _Tp&>
      borrowed_iterator_t<_Range>
      operator()(_Range&& __r, const _Tp& __x) const
      {
	return (*this)(ranges::begin(__r), ranges::end(__r), __x);
      }
  };

inline constexpr __uninitialized_fill_fn uninitialized_fill{};

struct __uninitialized_fill_n_fn
  {
    template<__detail::__nothrow_forward_iterator _Iter, typename _Tp>
      requires constructible_from<iter_value_t<_Iter>, const _Tp&>
      _Iter
      operator()(_Iter __first, iter_difference_t<_Iter> __n,
		 const _Tp& __x) const
      {
	using _ValueType = remove_reference_t<iter_reference_t<_Iter>>;
	if constexpr (is_trivial_v<_ValueType>
		      && is_nothrow_assignable_v<_ValueType&, const _Tp&>)
	  return ranges::fill_n(__first, __n, __x);
	else
	  {
	    auto __guard = __detail::_DestroyGuard(__first);
	    for (; __n > 0; ++__first, (void)--__n)
	      ::new (__detail::__voidify(*__first)) _ValueType(__x);
	    __guard.release();
	    return __first;
	  }
      }
  };

inline constexpr __uninitialized_fill_n_fn uninitialized_fill_n{};

struct __construct_at_fn
  {
    template<typename _Tp, typename... _Args>
      requires requires {
	::new (std::declval<void*>()) _Tp(std::declval<_Args>()...);
      }
      constexpr _Tp*
      operator()(_Tp* __location, _Args&&... __args) const
      noexcept(noexcept(std::construct_at(__location,
					  std::forward<_Args>(__args)...)))
      {
	return std::construct_at(__location,
				 std::forward<_Args>(__args)...);
      }
  };

inline constexpr __construct_at_fn construct_at{};

struct __destroy_at_fn
  {
    template<destructible _Tp>
      constexpr void
      operator()(_Tp* __location) const noexcept
      {
	if constexpr (is_array_v<_Tp>)
	  ranges::destroy(ranges::begin(*__location), ranges::end(*__location));
	else
	  __location->~_Tp();
      }
  };

inline constexpr __destroy_at_fn destroy_at{};

template<__detail::__nothrow_input_iterator _Iter,
	   __detail::__nothrow_sentinel<_Iter> _Sent>
    requires destructible<iter_value_t<_Iter>>
    constexpr _Iter
    __destroy_fn::operator()(_Iter __first, _Sent __last) const noexcept
    {
      if constexpr (is_trivially_destructible_v<iter_value_t<_Iter>>)
	return ranges::next(std::move(__first), __last);
      else
	{
	  for (; __first != __last; ++__first)
	    ranges::destroy_at(std::__addressof(*__first));
	  return __first;
	}
    }

template<__detail::__nothrow_input_range _Range>
    requires destructible<range_value_t<_Range>>
    constexpr borrowed_iterator_t<_Range>
    __destroy_fn::operator()(_Range&& __r) const noexcept
    {
      return (*this)(ranges::begin(__r), ranges::end(__r));
    }

struct __destroy_n_fn
  {
    template<__detail::__nothrow_input_iterator _Iter>
      requires destructible<iter_value_t<_Iter>>
      constexpr _Iter
      operator()(_Iter __first, iter_difference_t<_Iter> __n) const noexcept
      {
	if constexpr (is_trivially_destructible_v<iter_value_t<_Iter>>)
	  return ranges::next(std::move(__first), __n);
	else
	  {
	    for (; __n > 0; ++__first, (void)--__n)
	      ranges::destroy_at(std::__addressof(*__first));
	    return __first;
	  }
      }
  };

inline constexpr __destroy_n_fn destroy_n{};
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // concepts
#endif // C++20
#endif // _RANGES_UNINITIALIZED_H

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