FM / ext

/usr/include/c++/8/ext

Name	Size	Mode	Actions
pb_ds/	-	0755	rm
algorithm	19290	0644	edit dl rm
aligned_buffer.h	3972	0644	edit dl rm
alloc_traits.h	5702	0644	edit dl rm
array_allocator.h	5386	0644	edit dl rm
atomicity.h	3509	0644	edit dl rm
bitmap_allocator.h	31822	0644	edit dl rm
cast.h	4447	0644	edit dl rm
cmath	6570	0644	edit dl rm
codecvt_specializations.h	16353	0644	edit dl rm
concurrence.h	7611	0644	edit dl rm
debug_allocator.h	5716	0644	edit dl rm
enc_filebuf.h	2247	0644	edit dl rm
extptr_allocator.h	6189	0644	edit dl rm
functional	14292	0644	edit dl rm
hash_map	17775	0644	edit dl rm
hash_set	17195	0644	edit dl rm
iterator	4031	0644	edit dl rm
malloc_allocator.h	5086	0644	edit dl rm
memory	7156	0644	edit dl rm
mt_allocator.h	23507	0644	edit dl rm
new_allocator.h	4805	0644	edit dl rm
numeric	4731	0644	edit dl rm
numeric_traits.h	4575	0644	edit dl rm
pod_char_traits.h	5556	0644	edit dl rm
pointer.h	19827	0644	edit dl rm
pool_allocator.h	8821	0644	edit dl rm
random	111395	0644	edit dl rm
random.tcc	60247	0644	edit dl rm
rb_tree	3311	0644	edit dl rm
rc_string_base.h	23735	0644	edit dl rm
rope	87637	0644	edit dl rm
ropeimpl.h	48437	0644	edit dl rm
slist	29603	0644	edit dl rm
sso_string_base.h	16314	0644	edit dl rm
stdio_filebuf.h	5670	0644	edit dl rm
stdio_sync_filebuf.h	8782	0644	edit dl rm
string_conversions.h	3597	0644	edit dl rm
throw_allocator.h	24537	0644	edit dl rm
typelist.h	16480	0644	edit dl rm
type_traits.h	5914	0644	edit dl rm
vstring.h	110576	0644	edit dl rm
vstring.tcc	23614	0644	edit dl rm
vstring_fwd.h	3222	0644	edit dl rm
vstring_util.h	5767	0644	edit dl rm

Edit: /usr/include/c++/8/ext/rb_tree (3311B)

// rb_tree extension -*- C++ -*-

// Copyright (C) 2002-2018 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/>.

/*
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1996
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

/** @file ext/rb_tree
 *  This file is a GNU extension to the Standard C++ Library (possibly
 *  containing extensions from the HP/SGI STL subset). 
 */

#ifndef _RB_TREE
#define _RB_TREE 1

#pragma GCC system_header

#include <bits/stl_tree.h>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

using std::_Rb_tree;
  using std::allocator;

// Class rb_tree is not part of the C++ standard.  It is provided for
  // compatibility with the HP STL.

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
   */
  template <class _Key, class _Value, class _KeyOfValue, class _Compare,
	    class _Alloc = allocator<_Value> >
    struct rb_tree
    : public _Rb_tree<_Key, _Value, _KeyOfValue, _Compare, _Alloc>
    {
      typedef _Rb_tree<_Key, _Value, _KeyOfValue, _Compare, _Alloc> _Base;
      typedef typename _Base::allocator_type allocator_type;

rb_tree(const _Compare& __comp = _Compare(),
	      const allocator_type& __a = allocator_type())
      : _Base(__comp, __a) { }

~rb_tree() { }
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif

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