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File aligned_buffer.h

// Aligned memory buffer -*- C++ -*-

// Copyright (C) 2013-2018 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 ext/aligned_buffer.h
 *  This file is a GNU extension to the Standard C++ Library.
 */

#ifndef _ALIGNED_BUFFER_H
#define _ALIGNED_BUFFER_H 1

#pragma GCC system_header

#if __cplusplus >= 201103L
# include <type_traits>
#else
# include <bits/c++0x_warning.h>
#endif

namespace __gnu_cxx
{
  // A utility type containing a POD object that can hold an object of type
  // _Tp initialized via placement new or allocator_traits::construct.
  // Intended for use as a data member subobject, use __aligned_buffer for
  // complete objects.
  template<typename _Tp>
    struct __aligned_membuf
    {
      // Target macro ADJUST_FIELD_ALIGN can produce different alignment for
      // types when used as class members. __aligned_membuf is intended
      // for use as a class member, so align the buffer as for a class member.
      // Since GCC 8 we could just use alignof(_Tp) instead, but older
      // versions of non-GNU compilers might still need this trick.
      struct _Tp2 { _Tp _M_t; };

alignas(__alignof__(_Tp2::_M_t)) unsigned char _M_storage[sizeof(_Tp)];

__aligned_membuf() = default;

// Can be used to avoid value-initialization zeroing _M_storage.
      __aligned_membuf(std::nullptr_t) { }

void*
      _M_addr() noexcept
      { return static_cast<void*>(&_M_storage); }

const void*
      _M_addr() const noexcept
      { return static_cast<const void*>(&_M_storage); }

_Tp*
      _M_ptr() noexcept
      { return static_cast<_Tp*>(_M_addr()); }

const _Tp*
      _M_ptr() const noexcept
      { return static_cast<const _Tp*>(_M_addr()); }
    };

#if _GLIBCXX_INLINE_VERSION
  template<typename _Tp>
    using __aligned_buffer = __aligned_membuf<_Tp>;
#else
  // Similar to __aligned_membuf but aligned for complete objects, not members.
  // This type is used in <forward_list>, <future>, <bits/shared_ptr_base.h>
  // and <bits/hashtable_policy.h>, but ideally they would use __aligned_membuf
  // instead, as it has smaller size for some types on some targets.
  // This type is still used to avoid an ABI change.
  template<typename _Tp>
    struct __aligned_buffer
    : std::aligned_storage<sizeof(_Tp), __alignof__(_Tp)>
    {
      typename
	std::aligned_storage<sizeof(_Tp), __alignof__(_Tp)>::type _M_storage;

__aligned_buffer() = default;

// Can be used to avoid value-initialization
      __aligned_buffer(std::nullptr_t) { }

void*
      _M_addr() noexcept
      {
        return static_cast<void*>(&_M_storage);
      }

const void*
      _M_addr() const noexcept
      {
        return static_cast<const void*>(&_M_storage);
      }

_Tp*
      _M_ptr() noexcept
      { return static_cast<_Tp*>(_M_addr()); }

const _Tp*
      _M_ptr() const noexcept
      { return static_cast<const _Tp*>(_M_addr()); }
    };
#endif

} // namespace

#endif /* _ALIGNED_BUFFER_H */

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
..	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
pb_ds	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
algorithm	text/x-c	18.84 KB	-rw-r--r--	2025-08-26 09:45:00
aligned_buffer.h	text/plain	3.88 KB	-rw-r--r--	2025-08-26 09:45:00
alloc_traits.h	text/plain	5.57 KB	-rw-r--r--	2025-08-26 09:45:00
array_allocator.h	text/x-c	5.26 KB	-rw-r--r--	2025-08-26 09:45:00
atomicity.h	text/x-c	3.43 KB	-rw-r--r--	2025-08-26 09:45:00
bitmap_allocator.h	text/x-c	31.08 KB	-rw-r--r--	2025-08-26 09:45:00
cast.h	text/plain	4.34 KB	-rw-r--r--	2025-08-26 09:45:00
cmath	text/x-c	6.42 KB	-rw-r--r--	2025-08-26 09:45:00
codecvt_specializations.h	text/x-c	15.97 KB	-rw-r--r--	2025-08-26 09:45:00
concurrence.h	text/x-c	7.43 KB	-rw-r--r--	2025-08-26 09:45:00
debug_allocator.h	text/x-c	5.58 KB	-rw-r--r--	2025-08-26 09:45:00
enc_filebuf.h	text/x-c	2.19 KB	-rw-r--r--	2025-08-26 09:45:00
extptr_allocator.h	text/x-c	6.04 KB	-rw-r--r--	2025-08-26 09:45:00
functional	text/x-c	13.96 KB	-rw-r--r--	2025-08-26 09:45:00
hash_map	text/x-c	17.36 KB	-rw-r--r--	2025-08-26 09:45:01
hash_set	text/x-c	16.79 KB	-rw-r--r--	2025-08-26 09:45:01
iterator	text/x-c	3.94 KB	-rw-r--r--	2025-08-26 09:45:00
malloc_allocator.h	text/x-c	4.97 KB	-rw-r--r--	2025-08-26 09:45:00
memory	text/x-c	6.99 KB	-rw-r--r--	2025-08-26 09:45:00
mt_allocator.h	text/x-c	22.96 KB	-rw-r--r--	2025-08-26 09:45:00
new_allocator.h	text/x-c	4.69 KB	-rw-r--r--	2025-08-26 09:45:00
numeric	text/x-c	4.62 KB	-rw-r--r--	2025-08-26 09:45:00
numeric_traits.h	text/x-c	4.47 KB	-rw-r--r--	2025-08-26 09:45:00
pod_char_traits.h	text/x-c	5.43 KB	-rw-r--r--	2025-08-26 09:45:00
pointer.h	text/x-c	19.36 KB	-rw-r--r--	2025-08-26 09:45:00
pool_allocator.h	text/x-c	8.61 KB	-rw-r--r--	2025-08-26 09:45:00
random	text/x-c	108.78 KB	-rw-r--r--	2025-08-26 09:45:00
random.tcc	text/plain	58.83 KB	-rw-r--r--	2025-08-26 09:45:00
rb_tree	text/x-c	3.23 KB	-rw-r--r--	2025-08-26 09:45:00
rc_string_base.h	text/x-c	23.18 KB	-rw-r--r--	2025-08-26 09:45:01
rope	text/x-c	85.58 KB	-rw-r--r--	2025-08-26 09:45:00
ropeimpl.h	text/x-c	47.3 KB	-rw-r--r--	2025-08-26 09:45:00
slist	text/x-c	28.91 KB	-rw-r--r--	2025-08-26 09:45:00
sso_string_base.h	text/plain	15.93 KB	-rw-r--r--	2025-08-26 09:45:01
stdio_filebuf.h	text/x-c	5.54 KB	-rw-r--r--	2025-08-26 09:45:00
stdio_sync_filebuf.h	text/x-c	8.58 KB	-rw-r--r--	2025-08-26 09:45:00
string_conversions.h	text/x-c	3.51 KB	-rw-r--r--	2025-08-26 09:45:00
throw_allocator.h	text/x-c	23.96 KB	-rw-r--r--	2025-08-26 09:45:00
type_traits.h	text/x-c	5.78 KB	-rw-r--r--	2025-08-26 09:45:00
typelist.h	text/x-c	16.09 KB	-rw-r--r--	2025-08-26 09:45:00
vstring.h	text/x-c	107.98 KB	-rw-r--r--	2025-08-26 09:45:01
vstring.tcc	text/x-c	23.06 KB	-rw-r--r--	2025-08-26 09:45:01
vstring_fwd.h	text/x-c	3.15 KB	-rw-r--r--	2025-08-26 09:45:01
vstring_util.h	text/x-c	5.63 KB	-rw-r--r--	2025-08-26 09:45:01

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