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Name	Size	Permission	Date
backward	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
bits	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
debug	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
decimal	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
experimental	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
ext	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
parallel	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
pstl	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
tr1	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
tr2	[ DIR ]	drwxr-xr-x	2026-04-26 19:49
algorithm	2.97 KB	-rw-r--r--	2025-12-18 20:59
any	18.38 KB	-rw-r--r--	2025-12-18 20:59
array	15.21 KB	-rw-r--r--	2025-12-18 20:59
atomic	50.36 KB	-rw-r--r--	2025-12-18 20:59
barrier	7.89 KB	-rw-r--r--	2025-12-18 20:59
bit	14.04 KB	-rw-r--r--	2025-12-18 20:59
bitset	49.14 KB	-rw-r--r--	2025-12-18 20:59
cassert	1.61 KB	-rw-r--r--	2025-12-18 20:59
ccomplex	1.3 KB	-rw-r--r--	2025-12-18 20:59
cctype	2.35 KB	-rw-r--r--	2025-12-18 20:59
cerrno	1.73 KB	-rw-r--r--	2025-12-18 20:59
cfenv	2 KB	-rw-r--r--	2025-12-18 20:59
cfloat	1.84 KB	-rw-r--r--	2025-12-18 20:59
charconv	29.52 KB	-rw-r--r--	2025-12-18 20:59
chrono	94.76 KB	-rw-r--r--	2025-12-18 20:59
cinttypes	2.11 KB	-rw-r--r--	2025-12-18 20:59
ciso646	1.43 KB	-rw-r--r--	2025-12-18 20:59
climits	1.87 KB	-rw-r--r--	2025-12-18 20:59
clocale	1.86 KB	-rw-r--r--	2025-12-18 20:59
cmath	91.77 KB	-rw-r--r--	2025-12-18 20:59
codecvt	5.15 KB	-rw-r--r--	2025-12-18 20:59
compare	36.91 KB	-rw-r--r--	2025-12-18 20:59
complex	74.66 KB	-rw-r--r--	2025-12-18 20:59
complex.h	1.56 KB	-rw-r--r--	2025-12-18 20:59
concepts	12.51 KB	-rw-r--r--	2025-12-18 20:59
condition_variable	12.59 KB	-rw-r--r--	2025-12-18 20:59
coroutine	9.44 KB	-rw-r--r--	2025-12-18 20:59
csetjmp	1.9 KB	-rw-r--r--	2025-12-18 20:59
csignal	1.81 KB	-rw-r--r--	2025-12-18 20:59
cstdalign	1.37 KB	-rw-r--r--	2025-12-18 20:59
cstdarg	1.82 KB	-rw-r--r--	2025-12-18 20:59
cstdbool	1.37 KB	-rw-r--r--	2025-12-18 20:59
cstddef	6.5 KB	-rw-r--r--	2025-12-18 20:59
cstdint	3.76 KB	-rw-r--r--	2025-12-18 20:59
cstdio	4.33 KB	-rw-r--r--	2025-12-18 20:59
cstdlib	6.38 KB	-rw-r--r--	2025-12-18 20:59
cstring	3.08 KB	-rw-r--r--	2025-12-18 20:59
ctgmath	1.33 KB	-rw-r--r--	2025-12-18 20:59
ctime	2.24 KB	-rw-r--r--	2025-12-18 20:59
cuchar	2.84 KB	-rw-r--r--	2025-12-18 20:59
cwchar	6.39 KB	-rw-r--r--	2025-12-18 20:59
cwctype	2.73 KB	-rw-r--r--	2025-12-18 20:59
cxxabi.h	21.76 KB	-rw-r--r--	2025-12-18 20:59
deque	4.39 KB	-rw-r--r--	2025-12-18 20:59
exception	5.28 KB	-rw-r--r--	2025-12-18 20:59
execution	1.83 KB	-rw-r--r--	2025-12-18 20:59
expected	49.72 KB	-rw-r--r--	2025-12-18 20:59
fenv.h	1.97 KB	-rw-r--r--	2025-12-18 20:59
filesystem	1.66 KB	-rw-r--r--	2025-12-18 20:59
format	113.64 KB	-rw-r--r--	2025-12-18 20:59
forward_list	2.65 KB	-rw-r--r--	2025-12-18 20:59
fstream	39.77 KB	-rw-r--r--	2025-12-18 20:59
functional	45.45 KB	-rw-r--r--	2025-12-18 20:59
future	51.89 KB	-rw-r--r--	2025-12-18 20:59
initializer_list	2.93 KB	-rw-r--r--	2025-12-18 20:59
iomanip	16.22 KB	-rw-r--r--	2025-12-18 20:59
ios	1.61 KB	-rw-r--r--	2025-12-18 20:59
iosfwd	8.21 KB	-rw-r--r--	2025-12-18 20:59
iostream	3 KB	-rw-r--r--	2025-12-18 20:59
istream	35.47 KB	-rw-r--r--	2025-12-18 20:59
iterator	2.76 KB	-rw-r--r--	2025-12-18 20:59
latch	2.72 KB	-rw-r--r--	2025-12-18 20:59
limits	76.4 KB	-rw-r--r--	2025-12-18 20:59
list	3.6 KB	-rw-r--r--	2025-12-18 20:59
locale	1.5 KB	-rw-r--r--	2025-12-18 20:59
map	4.05 KB	-rw-r--r--	2025-12-18 20:59
math.h	4.47 KB	-rw-r--r--	2025-12-18 20:59
memory	4.82 KB	-rw-r--r--	2025-12-18 20:59
memory_resource	14.14 KB	-rw-r--r--	2025-12-18 20:59
mutex	26.63 KB	-rw-r--r--	2025-12-18 20:59
new	8.45 KB	-rw-r--r--	2025-12-18 20:59
numbers	6.87 KB	-rw-r--r--	2025-12-18 20:59
numeric	25.38 KB	-rw-r--r--	2025-12-18 20:59
optional	44.1 KB	-rw-r--r--	2025-12-18 20:59
ostream	26.56 KB	-rw-r--r--	2025-12-18 20:59
queue	2.46 KB	-rw-r--r--	2025-12-18 20:59
random	1.71 KB	-rw-r--r--	2025-12-18 20:59
ranges	253.81 KB	-rw-r--r--	2025-12-18 20:59
ratio	20.97 KB	-rw-r--r--	2025-12-18 20:59
regex	3.08 KB	-rw-r--r--	2025-12-18 20:59
scoped_allocator	17.33 KB	-rw-r--r--	2025-12-18 20:59
semaphore	2.98 KB	-rw-r--r--	2025-12-18 20:59
set	3.91 KB	-rw-r--r--	2025-12-18 20:59
shared_mutex	24.52 KB	-rw-r--r--	2025-12-18 20:59
source_location	2.68 KB	-rw-r--r--	2025-12-18 20:59
span	13.82 KB	-rw-r--r--	2025-12-18 20:59
spanstream	12.17 KB	-rw-r--r--	2025-12-18 20:59
sstream	38.83 KB	-rw-r--r--	2025-12-18 20:59
stack	2.38 KB	-rw-r--r--	2025-12-18 20:59
stacktrace	21.37 KB	-rw-r--r--	2025-12-18 20:59
stdatomic.h	3.97 KB	-rw-r--r--	2025-12-18 20:59
stdexcept	9.65 KB	-rw-r--r--	2025-12-18 20:59
stdfloat	1.72 KB	-rw-r--r--	2025-12-18 20:59
stdlib.h	2.25 KB	-rw-r--r--	2025-12-18 20:59
stop_token	15.7 KB	-rw-r--r--	2025-12-18 20:59
streambuf	29.24 KB	-rw-r--r--	2025-12-18 20:59
string	3.87 KB	-rw-r--r--	2025-12-18 20:59
string_view	27.33 KB	-rw-r--r--	2025-12-18 20:59
syncstream	8.17 KB	-rw-r--r--	2025-12-18 20:59
system_error	17.96 KB	-rw-r--r--	2025-12-18 20:59
tgmath.h	1.33 KB	-rw-r--r--	2025-12-18 20:59
thread	7.33 KB	-rw-r--r--	2025-12-18 20:59
tuple	76.49 KB	-rw-r--r--	2025-12-18 20:59
type_traits	112.36 KB	-rw-r--r--	2025-12-18 20:59
typeindex	3.43 KB	-rw-r--r--	2025-12-18 20:59
typeinfo	8.11 KB	-rw-r--r--	2025-12-18 20:59
unordered_map	3.37 KB	-rw-r--r--	2025-12-18 20:59
unordered_set	3.23 KB	-rw-r--r--	2025-12-18 20:59
utility	6.98 KB	-rw-r--r--	2025-12-18 20:59
valarray	40.2 KB	-rw-r--r--	2025-12-18 20:59
variant	64.72 KB	-rw-r--r--	2025-12-18 20:59
vector	4.72 KB	-rw-r--r--	2025-12-18 20:59
version	12.32 KB	-rw-r--r--	2025-12-18 20:59

Rename

// Components for manipulating non-owning sequences of objects -*- C++ -*-

// Copyright (C) 2019-2023 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 span
 *  This is a Standard C++ Library header.
 */

//
// P0122 span library
// Contributed by ThePhD
//

#ifndef _GLIBCXX_SPAN
#define _GLIBCXX_SPAN 1

#pragma GCC system_header

#if __cplusplus > 201703L

#include <array>
#include <cstddef>
#include <bits/stl_iterator.h>
#include <bits/ranges_base.h>

#if __cpp_lib_concepts
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

#define __cpp_lib_span 202002L

inline constexpr size_t dynamic_extent = static_cast<size_t>(-1);

template<typename _Type, size_t _Extent>
    class span;

namespace __detail
  {
    template<typename _Tp>
      inline constexpr bool __is_span = false;

template<typename _Tp, size_t _Num>
      inline constexpr bool __is_span<span<_Tp, _Num>> = true;

template<typename _Tp>
      inline constexpr bool __is_std_array = false;

template<typename _Tp, size_t _Num>
      inline constexpr bool __is_std_array<std::array<_Tp, _Num>> = true;

template<size_t _Extent>
      class __extent_storage
      {
      public:
	constexpr
	__extent_storage(size_t) noexcept
	{ }

static constexpr size_t
	_M_extent() noexcept
	{ return _Extent; }
      };

template<>
      class __extent_storage<dynamic_extent>
      {
      public:
	constexpr
	__extent_storage(size_t __extent) noexcept
	: _M_extent_value(__extent)
	{ }

constexpr size_t
	_M_extent() const noexcept
	{ return this->_M_extent_value; }

private:
	size_t _M_extent_value;
      };
  } // namespace __detail

template<typename _Type, size_t _Extent = dynamic_extent>
    class span
    {
      template<size_t _Offset, size_t _Count>
	static constexpr size_t
	_S_subspan_extent()
	{
	  if constexpr (_Count != dynamic_extent)
	    return _Count;
	  else if constexpr (extent != dynamic_extent)
	    return _Extent - _Offset;
	  else
	    return dynamic_extent;
	}

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 3255. span's array constructor is too strict
      template<typename _Tp, size_t _ArrayExtent>
	requires (_Extent == dynamic_extent || _ArrayExtent == _Extent)
	using __is_compatible_array = __is_array_convertible<_Type, _Tp>;

template<typename _Ref>
	using __is_compatible_ref
	  = __is_array_convertible<_Type, remove_reference_t<_Ref>>;

public:
      // member types
      using element_type           = _Type;
      using value_type             = remove_cv_t<_Type>;
      using size_type              = size_t;
      using difference_type        = ptrdiff_t;
      using pointer                = _Type*;
      using const_pointer          = const _Type*;
      using reference              = element_type&;
      using const_reference        = const element_type&;
      using iterator = __gnu_cxx::__normal_iterator<pointer, span>;
      using reverse_iterator       = std::reverse_iterator<iterator>;
#if __cplusplus > 202002L
      using const_iterator         = std::const_iterator<iterator>;
      using const_reverse_iterator = std::const_iterator<reverse_iterator>;
#endif

// member constants
      static constexpr size_t extent = _Extent;

// constructors, copy and assignment

constexpr
      span() noexcept
      requires (_Extent == dynamic_extent || _Extent == 0)
      : _M_ptr(nullptr), _M_extent(0)
      { }

template<contiguous_iterator _It>
	requires __is_compatible_ref<iter_reference_t<_It>>::value
	constexpr explicit(extent != dynamic_extent)
	span(_It __first, size_type __count)
	noexcept
	: _M_ptr(std::to_address(__first)), _M_extent(__count)
	{
	  if constexpr (_Extent != dynamic_extent)
	    {
	      __glibcxx_assert(__count == _Extent);
	    }
	  __glibcxx_requires_valid_range(__first, __first + __count);
	}

template<contiguous_iterator _It, sized_sentinel_for<_It> _End>
	requires __is_compatible_ref<iter_reference_t<_It>>::value
	  && (!is_convertible_v<_End, size_type>)
	constexpr explicit(extent != dynamic_extent)
	span(_It __first, _End __last)
	noexcept(noexcept(__last - __first))
	: _M_ptr(std::to_address(__first)),
	  _M_extent(static_cast<size_type>(__last - __first))
	{
	  if constexpr (_Extent != dynamic_extent)
	    {
	      __glibcxx_assert((__last - __first) == _Extent);
	    }
	  __glibcxx_requires_valid_range(__first, __last);
	}

template<size_t _ArrayExtent>
	requires (_Extent == dynamic_extent || _ArrayExtent == _Extent)
	constexpr
	span(type_identity_t<element_type> (&__arr)[_ArrayExtent]) noexcept
	: span(static_cast<pointer>(__arr), _ArrayExtent)
	{ }

template<typename _Tp, size_t _ArrayExtent>
	requires __is_compatible_array<_Tp, _ArrayExtent>::value
	constexpr
	span(array<_Tp, _ArrayExtent>& __arr) noexcept
	: span(static_cast<pointer>(__arr.data()), _ArrayExtent)
	{ }

template<typename _Tp, size_t _ArrayExtent>
	requires __is_compatible_array<const _Tp, _ArrayExtent>::value
	constexpr
	span(const array<_Tp, _ArrayExtent>& __arr) noexcept
	: span(static_cast<pointer>(__arr.data()), _ArrayExtent)
	{ }

template<typename _Range>
	requires (!__detail::__is_span<remove_cvref_t<_Range>>)
	  && (!__detail::__is_std_array<remove_cvref_t<_Range>>)
	  && (!is_array_v<remove_cvref_t<_Range>>)
	  && ranges::contiguous_range<_Range> && ranges::sized_range<_Range>
	  && (ranges::borrowed_range<_Range> || is_const_v<element_type>)
	  && __is_compatible_ref<ranges::range_reference_t<_Range>>::value
	constexpr explicit(extent != dynamic_extent)
	span(_Range&& __range)
	noexcept(noexcept(ranges::data(__range))
		  && noexcept(ranges::size(__range)))
	: span(ranges::data(__range), ranges::size(__range))
	{
	  if constexpr (extent != dynamic_extent)
	    {
	      __glibcxx_assert(ranges::size(__range) == extent);
	    }
	}

constexpr
      span(const span&) noexcept = default;

template<typename _OType, size_t _OExtent>
	requires (_Extent == dynamic_extent || _OExtent == dynamic_extent
		  || _Extent == _OExtent)
	  && (__is_array_convertible<_Type, _OType>::value)
	constexpr
	explicit(extent != dynamic_extent && _OExtent == dynamic_extent)
	span(const span<_OType, _OExtent>& __s) noexcept
	: _M_extent(__s.size()), _M_ptr(__s.data())
	{
	  if constexpr (extent != dynamic_extent)
	    {
	      __glibcxx_assert(__s.size() == extent);
	    }
	}

~span() noexcept = default;

constexpr span&
      operator=(const span&) noexcept = default;

// observers

[[nodiscard]]
      constexpr size_type
      size() const noexcept
      { return this->_M_extent._M_extent(); }

[[nodiscard]]
      constexpr size_type
      size_bytes() const noexcept
      { return this->_M_extent._M_extent() * sizeof(element_type); }

[[nodiscard]]
      constexpr bool
      empty() const noexcept
      { return size() == 0; }

// element access

[[nodiscard]]
      constexpr reference
      front() const noexcept
      {
	__glibcxx_assert(!empty());
	return *this->_M_ptr;
      }

[[nodiscard]]
      constexpr reference
      back() const noexcept
      {
	__glibcxx_assert(!empty());
	return *(this->_M_ptr + (size() - 1));
      }

[[nodiscard]]
      constexpr reference
      operator[](size_type __idx) const noexcept
      {
	__glibcxx_assert(__idx < size());
	return *(this->_M_ptr + __idx);
      }

[[nodiscard]]
      constexpr pointer
      data() const noexcept
      { return this->_M_ptr; }

// iterator support

[[nodiscard]]
      constexpr iterator
      begin() const noexcept
      { return iterator(this->_M_ptr); }

[[nodiscard]]
      constexpr iterator
      end() const noexcept
      { return iterator(this->_M_ptr + this->size()); }

[[nodiscard]]
      constexpr reverse_iterator
      rbegin() const noexcept
      { return reverse_iterator(this->end()); }

[[nodiscard]]
      constexpr reverse_iterator
      rend() const noexcept
      { return reverse_iterator(this->begin()); }

#if __cplusplus > 202002L
      [[nodiscard]]
      constexpr const_iterator
      cbegin() const noexcept
      { return begin(); }

[[nodiscard]]
      constexpr const_iterator
      cend() const noexcept
      { return end(); }

[[nodiscard]]
      constexpr const_reverse_iterator
      crbegin() const noexcept
      { return rbegin(); }

[[nodiscard]]
      constexpr const_reverse_iterator
      crend() const noexcept
      { return rend(); }
#endif

// subviews

template<size_t _Count>
	[[nodiscard]]
	constexpr span<element_type, _Count>
	first() const noexcept
	{
	  if constexpr (_Extent == dynamic_extent)
	    __glibcxx_assert(_Count <= size());
	  else
	    static_assert(_Count <= extent);
	  using _Sp = span<element_type, _Count>;
	  return _Sp{ this->data(), _Count };
	}

[[nodiscard]]
      constexpr span<element_type, dynamic_extent>
      first(size_type __count) const noexcept
      {
	__glibcxx_assert(__count <= size());
	return { this->data(), __count };
      }

template<size_t _Count>
	[[nodiscard]]
	constexpr span<element_type, _Count>
	last() const noexcept
	{
	  if constexpr (_Extent == dynamic_extent)
	    __glibcxx_assert(_Count <= size());
	  else
	    static_assert(_Count <= extent);
	  using _Sp = span<element_type, _Count>;
	  return _Sp{ this->data() + (this->size() - _Count), _Count };
	}

[[nodiscard]]
      constexpr span<element_type, dynamic_extent>
      last(size_type __count) const noexcept
      {
	__glibcxx_assert(__count <= size());
	return { this->data() + (this->size() - __count), __count };
      }

template<size_t _Offset, size_t _Count = dynamic_extent>
	[[nodiscard]]
	constexpr auto
	subspan() const noexcept
	-> span<element_type, _S_subspan_extent<_Offset, _Count>()>
	{
	  if constexpr (_Extent == dynamic_extent)
	    {
	      __glibcxx_assert(_Offset <= size());
	    }
	  else
	    static_assert(_Offset <= extent);

using _Sp = span<element_type, _S_subspan_extent<_Offset, _Count>()>;

if constexpr (_Count == dynamic_extent)
	    return _Sp{ this->data() + _Offset, this->size() - _Offset };
	  else
	    {
	      if constexpr (_Extent == dynamic_extent)
		{
		  __glibcxx_assert(_Count <= size());
		  __glibcxx_assert(_Count <= (size() - _Offset));
		}
	      else
		{
		  static_assert(_Count <= extent);
		  static_assert(_Count <= (extent - _Offset));
		}
	      return _Sp{ this->data() + _Offset, _Count };
	    }
	}

[[nodiscard]]
      constexpr span<element_type, dynamic_extent>
      subspan(size_type __offset, size_type __count = dynamic_extent) const
      noexcept
      {
	__glibcxx_assert(__offset <= size());
	if (__count == dynamic_extent)
	  __count = this->size() - __offset;
	else
	  {
	    __glibcxx_assert(__count <= size());
	    __glibcxx_assert(__offset + __count <= size());
	  }
	return {this->data() + __offset, __count};
      }

private:
      pointer _M_ptr;
      [[no_unique_address]] __detail::__extent_storage<extent> _M_extent;
    };

// deduction guides

template<typename _Type, size_t _ArrayExtent>
    span(_Type(&)[_ArrayExtent]) -> span<_Type, _ArrayExtent>;

template<typename _Type, size_t _ArrayExtent>
    span(array<_Type, _ArrayExtent>&) -> span<_Type, _ArrayExtent>;

template<typename _Type, size_t _ArrayExtent>
    span(const array<_Type, _ArrayExtent>&)
      -> span<const _Type, _ArrayExtent>;

template<contiguous_iterator _Iter, typename _End>
    span(_Iter, _End)
      -> span<remove_reference_t<iter_reference_t<_Iter>>>;

template<ranges::contiguous_range _Range>
    span(_Range &&)
      -> span<remove_reference_t<ranges::range_reference_t<_Range&>>>;

template<typename _Type, size_t _Extent>
    [[nodiscard]]
    inline
    span<const byte, _Extent == dynamic_extent
	? dynamic_extent : _Extent * sizeof(_Type)>
    as_bytes(span<_Type, _Extent> __sp) noexcept
    {
      auto data = reinterpret_cast<const byte*>(__sp.data());
      auto size = __sp.size_bytes();
      constexpr auto extent = _Extent == dynamic_extent
	? dynamic_extent : _Extent * sizeof(_Type);
      return span<const byte, extent>{data, size};
    }

template<typename _Type, size_t _Extent>
    requires (!is_const_v<_Type>)
    inline
    span<byte, _Extent == dynamic_extent
       ? dynamic_extent : _Extent * sizeof(_Type)>
    as_writable_bytes [[nodiscard]] (span<_Type, _Extent> __sp) noexcept
    {
      auto data = reinterpret_cast<byte*>(__sp.data());
      auto size = __sp.size_bytes();
      constexpr auto extent = _Extent == dynamic_extent
	? dynamic_extent : _Extent * sizeof(_Type);
      return span<byte, extent>{data, size};
    }

namespace ranges
  {
    // Opt-in to borrowed_range concept
    template<typename _ElementType, size_t _Extent>
      inline constexpr bool
	enable_borrowed_range<span<_ElementType, _Extent>> = true;

// Opt-in to view concept
    template<typename _ElementType, size_t _Extent>
      inline constexpr bool
	enable_view<span<_ElementType, _Extent>> = true;
  }
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // concepts
#endif // C++20
#endif // _GLIBCXX_SPAN