mirror of git://gcc.gnu.org/git/gcc.git
392 lines
12 KiB
C++
392 lines
12 KiB
C++
// <experimental/functional> -*- C++ -*-
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// Copyright (C) 2014-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file experimental/functional
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* This is a TS C++ Library header.
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*/
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#ifndef _GLIBCXX_EXPERIMENTAL_FUNCTIONAL
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#define _GLIBCXX_EXPERIMENTAL_FUNCTIONAL 1
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#pragma GCC system_header
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#if __cplusplus >= 201402L
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#include <functional>
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#include <tuple>
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#include <iterator>
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#include <unordered_map>
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#include <vector>
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#include <array>
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#include <bits/stl_algo.h>
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#ifdef _GLIBCXX_PARALLEL
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# include <parallel/algorithm> // For std::__parallel::search
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#endif
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#include <experimental/bits/lfts_config.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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namespace experimental
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{
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inline namespace fundamentals_v1
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{
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// See C++14 §20.9.9, Function object binders
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/// Variable template for std::is_bind_expression
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template<typename _Tp>
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constexpr bool is_bind_expression_v = std::is_bind_expression<_Tp>::value;
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/// Variable template for std::is_placeholder
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template<typename _Tp>
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constexpr int is_placeholder_v = std::is_placeholder<_Tp>::value;
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#define __cpp_lib_experimental_boyer_moore_searching 201411
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// Searchers
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template<typename _ForwardIterator1, typename _BinaryPredicate = equal_to<>>
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class default_searcher
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{
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public:
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default_searcher(_ForwardIterator1 __pat_first,
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_ForwardIterator1 __pat_last,
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_BinaryPredicate __pred = _BinaryPredicate())
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: _M_m(__pat_first, __pat_last, std::move(__pred))
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{ }
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template<typename _ForwardIterator2>
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_ForwardIterator2
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operator()(_ForwardIterator2 __first, _ForwardIterator2 __last) const
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{
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return std::search(__first, __last,
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std::get<0>(_M_m), std::get<1>(_M_m),
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std::get<2>(_M_m));
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}
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private:
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std::tuple<_ForwardIterator1, _ForwardIterator1, _BinaryPredicate> _M_m;
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};
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template<typename _Key, typename _Tp, typename _Hash, typename _Pred>
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struct __boyer_moore_map_base
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{
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template<typename _RAIter>
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__boyer_moore_map_base(_RAIter __pat, size_t __patlen,
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_Hash&& __hf, _Pred&& __pred)
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: _M_bad_char{ __patlen, std::move(__hf), std::move(__pred) }
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{
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if (__patlen > 0)
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for (__diff_type __i = 0; __i < __patlen - 1; ++__i)
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_M_bad_char[__pat[__i]] = __patlen - 1 - __i;
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}
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using __diff_type = _Tp;
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__diff_type
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_M_lookup(_Key __key, __diff_type __not_found) const
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{
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auto __iter = _M_bad_char.find(__key);
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if (__iter == _M_bad_char.end())
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return __not_found;
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return __iter->second;
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}
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_Pred
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_M_pred() const { return _M_bad_char.key_eq(); }
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_GLIBCXX_STD_C::unordered_map<_Key, _Tp, _Hash, _Pred> _M_bad_char;
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};
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template<typename _Tp, size_t _Len, typename _Pred>
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struct __boyer_moore_array_base
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{
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template<typename _RAIter, typename _Unused>
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__boyer_moore_array_base(_RAIter __pat, size_t __patlen,
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_Unused&&, _Pred&& __pred)
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: _M_bad_char{ _GLIBCXX_STD_C::array<_Tp, _Len>{}, std::move(__pred) }
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{
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std::get<0>(_M_bad_char).fill(__patlen);
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if (__patlen > 0)
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for (__diff_type __i = 0; __i < __patlen - 1; ++__i)
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{
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auto __ch = __pat[__i];
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using _UCh = std::make_unsigned_t<decltype(__ch)>;
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auto __uch = static_cast<_UCh>(__ch);
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std::get<0>(_M_bad_char)[__uch] = __patlen - 1 - __i;
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}
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}
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using __diff_type = _Tp;
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template<typename _Key>
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__diff_type
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_M_lookup(_Key __key, __diff_type __not_found) const
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{
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auto __ukey = static_cast<std::make_unsigned_t<_Key>>(__key);
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if (__ukey >= _Len)
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return __not_found;
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return std::get<0>(_M_bad_char)[__ukey];
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}
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const _Pred&
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_M_pred() const { return std::get<1>(_M_bad_char); }
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std::tuple<_GLIBCXX_STD_C::array<_Tp, _Len>, _Pred> _M_bad_char;
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};
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template<typename _Pred>
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struct __is_std_equal_to : std::false_type { };
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template<>
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struct __is_std_equal_to<std::equal_to<void>> : std::true_type { };
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// Use __boyer_moore_array_base when pattern consists of narrow characters
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// and uses std::equal_to as the predicate.
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template<typename _RAIter, typename _Hash, typename _Pred,
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typename _Val = typename iterator_traits<_RAIter>::value_type,
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typename _Diff = typename iterator_traits<_RAIter>::difference_type>
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using __boyer_moore_base_t
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= std::conditional_t<sizeof(_Val) == 1 && is_integral<_Val>::value
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&& __is_std_equal_to<_Pred>::value,
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__boyer_moore_array_base<_Diff, 256, _Pred>,
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__boyer_moore_map_base<_Val, _Diff, _Hash, _Pred>>;
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template<typename _RAIter, typename _Hash
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= std::hash<typename std::iterator_traits<_RAIter>::value_type>,
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typename _BinaryPredicate = std::equal_to<>>
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class boyer_moore_searcher
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: __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>
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{
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using _Base = __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>;
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using typename _Base::__diff_type;
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public:
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boyer_moore_searcher(_RAIter __pat_first, _RAIter __pat_last,
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_Hash __hf = _Hash(),
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_BinaryPredicate __pred = _BinaryPredicate());
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template<typename _RandomAccessIterator2>
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_RandomAccessIterator2
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operator()(_RandomAccessIterator2 __first,
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_RandomAccessIterator2 __last) const;
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private:
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bool
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_M_is_prefix(_RAIter __word, __diff_type __len,
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__diff_type __pos)
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{
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const auto& __pred = this->_M_pred();
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__diff_type __suffixlen = __len - __pos;
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for (__diff_type __i = 0; __i < __suffixlen; ++__i)
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if (!__pred(__word[__i], __word[__pos + __i]))
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return false;
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return true;
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}
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__diff_type
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_M_suffix_length(_RAIter __word, __diff_type __len,
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__diff_type __pos)
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{
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const auto& __pred = this->_M_pred();
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__diff_type __i = 0;
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while (__pred(__word[__pos - __i], __word[__len - 1 - __i])
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&& __i < __pos)
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{
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++__i;
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}
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return __i;
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}
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template<typename _Tp>
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__diff_type
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_M_bad_char_shift(_Tp __c) const
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{ return this->_M_lookup(__c, _M_pat_end - _M_pat); }
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_RAIter _M_pat;
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_RAIter _M_pat_end;
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_GLIBCXX_STD_C::vector<__diff_type> _M_good_suffix;
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};
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template<typename _RAIter, typename _Hash
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= std::hash<typename std::iterator_traits<_RAIter>::value_type>,
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typename _BinaryPredicate = std::equal_to<>>
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class boyer_moore_horspool_searcher
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: __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>
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{
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using _Base = __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>;
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using typename _Base::__diff_type;
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public:
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boyer_moore_horspool_searcher(_RAIter __pat,
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_RAIter __pat_end,
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_Hash __hf = _Hash(),
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_BinaryPredicate __pred
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= _BinaryPredicate())
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: _Base(__pat, __pat_end - __pat, std::move(__hf), std::move(__pred)),
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_M_pat(__pat), _M_pat_end(__pat_end)
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{ }
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template<typename _RandomAccessIterator2>
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_RandomAccessIterator2
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operator()(_RandomAccessIterator2 __first,
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_RandomAccessIterator2 __last) const
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{
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const auto& __pred = this->_M_pred();
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auto __patlen = _M_pat_end - _M_pat;
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if (__patlen == 0)
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return __first;
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auto __len = __last - __first;
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while (__len >= __patlen)
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{
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for (auto __scan = __patlen - 1;
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__pred(__first[__scan], _M_pat[__scan]); --__scan)
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if (__scan == 0)
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return __first;
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auto __shift = _M_bad_char_shift(__first[__patlen - 1]);
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__len -= __shift;
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__first += __shift;
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}
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return __last;
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}
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private:
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template<typename _Tp>
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__diff_type
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_M_bad_char_shift(_Tp __c) const
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{ return this->_M_lookup(__c, _M_pat_end - _M_pat); }
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_RAIter _M_pat;
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_RAIter _M_pat_end;
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};
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/// Generator function for default_searcher
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template<typename _ForwardIterator,
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typename _BinaryPredicate = std::equal_to<>>
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inline default_searcher<_ForwardIterator, _BinaryPredicate>
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make_default_searcher(_ForwardIterator __pat_first,
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_ForwardIterator __pat_last,
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_BinaryPredicate __pred = _BinaryPredicate())
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{ return { __pat_first, __pat_last, __pred }; }
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/// Generator function for boyer_moore_searcher
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template<typename _RAIter, typename _Hash
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= std::hash<typename std::iterator_traits<_RAIter>::value_type>,
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typename _BinaryPredicate = equal_to<>>
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inline boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>
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make_boyer_moore_searcher(_RAIter __pat_first, _RAIter __pat_last,
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_Hash __hf = _Hash(),
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_BinaryPredicate __pred = _BinaryPredicate())
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{ return { __pat_first, __pat_last, std::move(__hf), std::move(__pred) }; }
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/// Generator function for boyer_moore_horspool_searcher
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template<typename _RAIter, typename _Hash
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= std::hash<typename std::iterator_traits<_RAIter>::value_type>,
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typename _BinaryPredicate = equal_to<>>
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inline boyer_moore_horspool_searcher<_RAIter, _Hash, _BinaryPredicate>
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make_boyer_moore_horspool_searcher(_RAIter __pat_first, _RAIter __pat_last,
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_Hash __hf = _Hash(),
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_BinaryPredicate __pred
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= _BinaryPredicate())
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{ return { __pat_first, __pat_last, std::move(__hf), std::move(__pred) }; }
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template<typename _RAIter, typename _Hash, typename _BinaryPredicate>
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boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>::
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boyer_moore_searcher(_RAIter __pat, _RAIter __pat_end,
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_Hash __hf, _BinaryPredicate __pred)
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: _Base(__pat, __pat_end - __pat, std::move(__hf), std::move(__pred)),
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_M_pat(__pat), _M_pat_end(__pat_end), _M_good_suffix(__pat_end - __pat)
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{
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auto __patlen = __pat_end - __pat;
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if (__patlen == 0)
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return;
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__diff_type __last_prefix = __patlen - 1;
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for (__diff_type __p = __patlen - 1; __p >= 0; --__p)
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{
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if (_M_is_prefix(__pat, __patlen, __p + 1))
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__last_prefix = __p + 1;
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_M_good_suffix[__p] = __last_prefix + (__patlen - 1 - __p);
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}
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for (__diff_type __p = 0; __p < __patlen - 1; ++__p)
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{
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auto __slen = _M_suffix_length(__pat, __patlen, __p);
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auto __pos = __patlen - 1 - __slen;
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if (!__pred(__pat[__p - __slen], __pat[__pos]))
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_M_good_suffix[__pos] = __patlen - 1 - __p + __slen;
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}
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}
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template<typename _RAIter, typename _Hash, typename _BinaryPredicate>
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template<typename _RandomAccessIterator2>
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_RandomAccessIterator2
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boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>::
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operator()(_RandomAccessIterator2 __first,
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_RandomAccessIterator2 __last) const
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{
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auto __patlen = _M_pat_end - _M_pat;
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if (__patlen == 0)
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return __first;
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const auto& __pred = this->_M_pred();
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__diff_type __i = __patlen - 1;
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auto __stringlen = __last - __first;
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while (__i < __stringlen)
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{
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__diff_type __j = __patlen - 1;
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while (__j >= 0 && __pred(__first[__i], _M_pat[__j]))
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{
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--__i;
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--__j;
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}
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if (__j < 0)
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return __first + __i + 1;
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__i += std::max(_M_bad_char_shift(__first[__i]),
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_M_good_suffix[__j]);
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}
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return __last;
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}
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} // namespace fundamentals_v1
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inline namespace fundamentals_v2
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{
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#define __cpp_lib_experimental_not_fn 201406
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/// [func.not_fn] Function template not_fn
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template<typename _Fn>
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inline auto
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not_fn(_Fn&& __fn)
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noexcept(std::is_nothrow_constructible<std::decay_t<_Fn>, _Fn&&>::value)
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{
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return std::_Not_fn<std::decay_t<_Fn>>{std::forward<_Fn>(__fn), 0};
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}
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} // namespace fundamentals_v2
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} // namespace experimental
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif // C++14
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#endif // _GLIBCXX_EXPERIMENTAL_FUNCTIONAL
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