<h2>File Contents: //usr/include/c++/8/experimental/functional</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='//usr/include/c++/8/experimental/functional'><textarea name='file_content' rows='10' cols='50'>// &lt;experimental/functional&gt; -*- C++ -*-

// Copyright (C) 2014-2018 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
// &lt;http://www.gnu.org/licenses/&gt;.

/** @file experimental/functional
 *  This is a TS C++ Library header.
 */

#ifndef _GLIBCXX_EXPERIMENTAL_FUNCTIONAL
#define _GLIBCXX_EXPERIMENTAL_FUNCTIONAL 1

#pragma GCC system_header

#if __cplusplus &gt;= 201402L

#include &lt;functional&gt;
#include &lt;tuple&gt;
#include &lt;iterator&gt;
#include &lt;unordered_map&gt;
#include &lt;vector&gt;
#include &lt;array&gt;
#include &lt;bits/stl_algo.h&gt;
#ifdef _GLIBCXX_PARALLEL
# include &lt;parallel/algorithm&gt; // For std::__parallel::search
#endif
#include &lt;experimental/bits/lfts_config.h&gt;

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace experimental
{
inline namespace fundamentals_v1
{
  // See C++14 §20.9.9, Function object binders

  /// Variable template for std::is_bind_expression
  template&lt;typename _Tp&gt;
    constexpr bool is_bind_expression_v = std::is_bind_expression&lt;_Tp&gt;::value;

  /// Variable template for std::is_placeholder
  template&lt;typename _Tp&gt;
    constexpr int is_placeholder_v = std::is_placeholder&lt;_Tp&gt;::value;

#define __cpp_lib_experimental_boyer_moore_searching 201411

  // Searchers

  template&lt;typename _ForwardIterator1, typename _BinaryPredicate = equal_to&lt;&gt;&gt;
    class default_searcher
    {
    public:
      default_searcher(_ForwardIterator1 __pat_first,
		       _ForwardIterator1 __pat_last,
		       _BinaryPredicate __pred = _BinaryPredicate())
      : _M_m(__pat_first, __pat_last, std::move(__pred))
      { }

      template&lt;typename _ForwardIterator2&gt;
	_ForwardIterator2
	operator()(_ForwardIterator2 __first, _ForwardIterator2 __last) const
	{
	  return std::search(__first, __last,
			     std::get&lt;0&gt;(_M_m), std::get&lt;1&gt;(_M_m),
			     std::get&lt;2&gt;(_M_m));
	}

    private:
      std::tuple&lt;_ForwardIterator1, _ForwardIterator1, _BinaryPredicate&gt; _M_m;
    };

  template&lt;typename _Key, typename _Tp, typename _Hash, typename _Pred&gt;
    struct __boyer_moore_map_base
    {
      template&lt;typename _RAIter&gt;
	__boyer_moore_map_base(_RAIter __pat, size_t __patlen,
			       _Hash&amp;&amp; __hf, _Pred&amp;&amp; __pred)
	: _M_bad_char{ __patlen, std::move(__hf), std::move(__pred) }
	{
	  if (__patlen &gt; 0)
	    for (__diff_type __i = 0; __i &lt; __patlen - 1; ++__i)
	      _M_bad_char[__pat[__i]] = __patlen - 1 - __i;
	}

      using __diff_type = _Tp;

      __diff_type
      _M_lookup(_Key __key, __diff_type __not_found) const
      {
	auto __iter = _M_bad_char.find(__key);
	if (__iter == _M_bad_char.end())
	  return __not_found;
	return __iter-&gt;second;
      }

      _Pred
      _M_pred() const { return _M_bad_char.key_eq(); }

      _GLIBCXX_STD_C::unordered_map&lt;_Key, _Tp, _Hash, _Pred&gt; _M_bad_char;
    };

  template&lt;typename _Tp, size_t _Len, typename _Pred&gt;
    struct __boyer_moore_array_base
    {
      template&lt;typename _RAIter, typename _Unused&gt;
	__boyer_moore_array_base(_RAIter __pat, size_t __patlen,
				 _Unused&amp;&amp;, _Pred&amp;&amp; __pred)
	: _M_bad_char{ _GLIBCXX_STD_C::array&lt;_Tp, _Len&gt;{}, std::move(__pred) }
	{
	  std::get&lt;0&gt;(_M_bad_char).fill(__patlen);
	  if (__patlen &gt; 0)
	    for (__diff_type __i = 0; __i &lt; __patlen - 1; ++__i)
	      {
		auto __ch = __pat[__i];
		using _UCh = std::make_unsigned_t&lt;decltype(__ch)&gt;;
		auto __uch = static_cast&lt;_UCh&gt;(__ch);
		std::get&lt;0&gt;(_M_bad_char)[__uch] = __patlen - 1 - __i;
	      }
	}

      using __diff_type = _Tp;

      template&lt;typename _Key&gt;
	__diff_type
	_M_lookup(_Key __key, __diff_type __not_found) const
	{
	  auto __ukey = static_cast&lt;std::make_unsigned_t&lt;_Key&gt;&gt;(__key);
	  if (__ukey &gt;= _Len)
	    return __not_found;
	  return std::get&lt;0&gt;(_M_bad_char)[__ukey];
	}

      const _Pred&amp;
      _M_pred() const { return std::get&lt;1&gt;(_M_bad_char); }

      std::tuple&lt;_GLIBCXX_STD_C::array&lt;_Tp, _Len&gt;, _Pred&gt; _M_bad_char;
    };

  // Use __boyer_moore_array_base when pattern consists of narrow characters
  // (or std::byte) and uses std::equal_to as the predicate.
  template&lt;typename _RAIter, typename _Hash, typename _Pred,
           typename _Val = typename iterator_traits&lt;_RAIter&gt;::value_type,
	   typename _Diff = typename iterator_traits&lt;_RAIter&gt;::difference_type&gt;
    using __boyer_moore_base_t
      = std::conditional_t&lt;std::__is_byte_like&lt;_Val, _Pred&gt;::value,
			   __boyer_moore_array_base&lt;_Diff, 256, _Pred&gt;,
			   __boyer_moore_map_base&lt;_Val, _Diff, _Hash, _Pred&gt;&gt;;

  template&lt;typename _RAIter, typename _Hash
	     = std::hash&lt;typename std::iterator_traits&lt;_RAIter&gt;::value_type&gt;,
	   typename _BinaryPredicate = std::equal_to&lt;&gt;&gt;
    class boyer_moore_searcher
    : __boyer_moore_base_t&lt;_RAIter, _Hash, _BinaryPredicate&gt;
    {
      using _Base = __boyer_moore_base_t&lt;_RAIter, _Hash, _BinaryPredicate&gt;;
      using typename _Base::__diff_type;

    public:
      boyer_moore_searcher(_RAIter __pat_first, _RAIter __pat_last,
			   _Hash __hf = _Hash(),
			   _BinaryPredicate __pred = _BinaryPredicate());

      template&lt;typename _RandomAccessIterator2&gt;
	_RandomAccessIterator2
	operator()(_RandomAccessIterator2 __first,
		   _RandomAccessIterator2 __last) const;

    private:
      bool
      _M_is_prefix(_RAIter __word, __diff_type __len,
		   __diff_type __pos)
      {
	const auto&amp; __pred = this-&gt;_M_pred();
	__diff_type __suffixlen = __len - __pos;
	for (__diff_type __i = 0; __i &lt; __suffixlen; ++__i)
	  if (!__pred(__word[__i], __word[__pos + __i]))
	    return false;
	return true;
      }

      __diff_type
      _M_suffix_length(_RAIter __word, __diff_type __len,
		       __diff_type __pos)
      {
	const auto&amp; __pred = this-&gt;_M_pred();
	__diff_type __i = 0;
	while (__pred(__word[__pos - __i], __word[__len - 1 - __i])
	       &amp;&amp; __i &lt; __pos)
	  {
	    ++__i;
	  }
	return __i;
      }

      template&lt;typename _Tp&gt;
	__diff_type
	_M_bad_char_shift(_Tp __c) const
	{ return this-&gt;_M_lookup(__c, _M_pat_end - _M_pat); }

      _RAIter _M_pat;
      _RAIter _M_pat_end;
      _GLIBCXX_STD_C::vector&lt;__diff_type&gt; _M_good_suffix;
    };

  template&lt;typename _RAIter, typename _Hash
	     = std::hash&lt;typename std::iterator_traits&lt;_RAIter&gt;::value_type&gt;,
	   typename _BinaryPredicate = std::equal_to&lt;&gt;&gt;
    class boyer_moore_horspool_searcher
    : __boyer_moore_base_t&lt;_RAIter, _Hash, _BinaryPredicate&gt;
    {
      using _Base = __boyer_moore_base_t&lt;_RAIter, _Hash, _BinaryPredicate&gt;;
      using typename _Base::__diff_type;

    public:
      boyer_moore_horspool_searcher(_RAIter __pat,
				    _RAIter __pat_end,
				    _Hash __hf = _Hash(),
				    _BinaryPredicate __pred
				    = _BinaryPredicate())
      : _Base(__pat, __pat_end - __pat, std::move(__hf), std::move(__pred)),
	_M_pat(__pat), _M_pat_end(__pat_end)
      { }

      template&lt;typename _RandomAccessIterator2&gt;
	_RandomAccessIterator2
	operator()(_RandomAccessIterator2 __first,
		   _RandomAccessIterator2 __last) const
	{
	  const auto&amp; __pred = this-&gt;_M_pred();
	  auto __patlen = _M_pat_end - _M_pat;
	  if (__patlen == 0)
	    return __first;
	  auto __len = __last - __first;
	  while (__len &gt;= __patlen)
	    {
	      for (auto __scan = __patlen - 1;
		   __pred(__first[__scan], _M_pat[__scan]); --__scan)
		if (__scan == 0)
		  return __first;
	      auto __shift = _M_bad_char_shift(__first[__patlen - 1]);
	      __len -= __shift;
	      __first += __shift;
	    }
	  return __last;
	}

    private:
      template&lt;typename _Tp&gt;
	__diff_type
	_M_bad_char_shift(_Tp __c) const
	{ return this-&gt;_M_lookup(__c, _M_pat_end - _M_pat); }

      _RAIter _M_pat;
      _RAIter _M_pat_end;
    };

  /// Generator function for default_searcher
  template&lt;typename _ForwardIterator,
	   typename _BinaryPredicate = std::equal_to&lt;&gt;&gt;
    inline default_searcher&lt;_ForwardIterator, _BinaryPredicate&gt;
    make_default_searcher(_ForwardIterator __pat_first,
			  _ForwardIterator __pat_last,
			  _BinaryPredicate __pred = _BinaryPredicate())
    { return { __pat_first, __pat_last, __pred }; }

  /// Generator function for boyer_moore_searcher
  template&lt;typename _RAIter, typename _Hash
	     = std::hash&lt;typename std::iterator_traits&lt;_RAIter&gt;::value_type&gt;,
	   typename _BinaryPredicate = equal_to&lt;&gt;&gt;
    inline boyer_moore_searcher&lt;_RAIter, _Hash, _BinaryPredicate&gt;
    make_boyer_moore_searcher(_RAIter __pat_first, _RAIter __pat_last,
			      _Hash __hf = _Hash(),
			      _BinaryPredicate __pred = _BinaryPredicate())
    { return { __pat_first, __pat_last, std::move(__hf), std::move(__pred) }; }

  /// Generator function for boyer_moore_horspool_searcher
  template&lt;typename _RAIter, typename _Hash
	     = std::hash&lt;typename std::iterator_traits&lt;_RAIter&gt;::value_type&gt;,
	   typename _BinaryPredicate = equal_to&lt;&gt;&gt;
    inline boyer_moore_horspool_searcher&lt;_RAIter, _Hash, _BinaryPredicate&gt;
    make_boyer_moore_horspool_searcher(_RAIter __pat_first, _RAIter __pat_last,
				       _Hash __hf = _Hash(),
				       _BinaryPredicate __pred
				       = _BinaryPredicate())
    { return { __pat_first, __pat_last, std::move(__hf), std::move(__pred) }; }

  template&lt;typename _RAIter, typename _Hash, typename _BinaryPredicate&gt;
    boyer_moore_searcher&lt;_RAIter, _Hash, _BinaryPredicate&gt;::
    boyer_moore_searcher(_RAIter __pat, _RAIter __pat_end,
			 _Hash __hf, _BinaryPredicate __pred)
    : _Base(__pat, __pat_end - __pat, std::move(__hf), std::move(__pred)),
      _M_pat(__pat), _M_pat_end(__pat_end), _M_good_suffix(__pat_end - __pat)
    {
      auto __patlen = __pat_end - __pat;
      if (__patlen == 0)
	return;
      __diff_type __last_prefix = __patlen - 1;
      for (__diff_type __p = __patlen - 1; __p &gt;= 0; --__p)
	{
	  if (_M_is_prefix(__pat, __patlen, __p + 1))
	    __last_prefix = __p + 1;
	  _M_good_suffix[__p] = __last_prefix + (__patlen - 1 - __p);
	}
      for (__diff_type __p = 0; __p &lt; __patlen - 1; ++__p)
	{
	  auto __slen = _M_suffix_length(__pat, __patlen, __p);
	  auto __pos = __patlen - 1 - __slen;
	  if (!__pred(__pat[__p - __slen], __pat[__pos]))
	    _M_good_suffix[__pos] = __patlen - 1 - __p + __slen;
	}
    }

  template&lt;typename _RAIter, typename _Hash, typename _BinaryPredicate&gt;
  template&lt;typename _RandomAccessIterator2&gt;
    _RandomAccessIterator2
    boyer_moore_searcher&lt;_RAIter, _Hash, _BinaryPredicate&gt;::
    operator()(_RandomAccessIterator2 __first,
	       _RandomAccessIterator2 __last) const
    {
      auto __patlen = _M_pat_end - _M_pat;
      if (__patlen == 0)
	return __first;
      const auto&amp; __pred = this-&gt;_M_pred();
      __diff_type __i = __patlen - 1;
      auto __stringlen = __last - __first;
      while (__i &lt; __stringlen)
	{
	  __diff_type __j = __patlen - 1;
	  while (__j &gt;= 0 &amp;&amp; __pred(__first[__i], _M_pat[__j]))
	    {
	      --__i;
	      --__j;
	    }
	  if (__j &lt; 0)
	    return __first + __i + 1;
	  __i += std::max(_M_bad_char_shift(__first[__i]),
			  _M_good_suffix[__j]);
	}
      return __last;
    }
} // namespace fundamentals_v1

inline namespace fundamentals_v2
{
#define __cpp_lib_experimental_not_fn 201406

  /// [func.not_fn] Function template not_fn
  template&lt;typename _Fn&gt;
    inline auto
    not_fn(_Fn&amp;&amp; __fn)
    noexcept(std::is_nothrow_constructible&lt;std::decay_t&lt;_Fn&gt;, _Fn&amp;&amp;&gt;::value)
    {
      return std::_Not_fn&lt;std::decay_t&lt;_Fn&gt;&gt;{std::forward&lt;_Fn&gt;(__fn), 0};
    }
} // namespace fundamentals_v2
} // namespace experimental

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // C++14

#endif // _GLIBCXX_EXPERIMENTAL_FUNCTIONAL
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