diff options
Diffstat (limited to 'libstdc++-v3/include/std/functional')
| -rw-r--r-- | libstdc++-v3/include/std/functional | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/libstdc++-v3/include/std/functional b/libstdc++-v3/include/std/functional index 05d4282c8bd..c750a8374bc 100644 --- a/libstdc++-v3/include/std/functional +++ b/libstdc++-v3/include/std/functional @@ -58,6 +58,14 @@ #include <bits/functional_hash.h> #include <bits/invoke.h> +#if __cplusplus > 201402L +#include <unordered_map> +#include <vector> +#include <array> +#include <utility> +#include <bits/stl_algo.h> +#endif + namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION @@ -2197,6 +2205,315 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type) return _Not_fn<std::decay_t<_Fn>>{std::forward<_Fn>(__fn)}; } + // Searchers + + template<typename _ForwardIterator1, typename _BinaryPredicate = equal_to<>> + 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<typename _ForwardIterator2> + pair<_ForwardIterator2, _ForwardIterator2> + operator()(_ForwardIterator2 __first, _ForwardIterator2 __last) const + { + _ForwardIterator2 __first_ret = + std::search(__first, __last, + std::get<0>(_M_m), std::get<1>(_M_m), + std::get<2>(_M_m)); + _ForwardIterator2 __second_ret = __first_ret == __last ? + __last : std::next(__first_ret, std::distance(std::get<0>(_M_m), + std::get<1>(_M_m))); + return std::make_pair(__first_ret, __second_ret); + } + + private: + std::tuple<_ForwardIterator1, _ForwardIterator1, _BinaryPredicate> _M_m; + }; + + template<typename _Key, typename _Tp, typename _Hash, typename _Pred> + struct __boyer_moore_map_base + { + template<typename _RAIter> + __boyer_moore_map_base(_RAIter __pat, size_t __patlen, + _Hash&& __hf, _Pred&& __pred) + : _M_bad_char{ __patlen, std::move(__hf), std::move(__pred) } + { + if (__patlen > 0) + for (__diff_type __i = 0; __i < __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->second; + } + + _Pred + _M_pred() const { return _M_bad_char.key_eq(); } + + std::unordered_map<_Key, _Tp, _Hash, _Pred> _M_bad_char; + }; + + template<typename _Tp, size_t _Len, typename _Pred> + struct __boyer_moore_array_base + { + template<typename _RAIter, typename _Unused> + __boyer_moore_array_base(_RAIter __pat, size_t __patlen, + _Unused&&, _Pred&& __pred) + : _M_bad_char{ std::array<_Tp, _Len>{}, std::move(__pred) } + { + std::get<0>(_M_bad_char).fill(__patlen); + if (__patlen > 0) + for (__diff_type __i = 0; __i < __patlen - 1; ++__i) + { + auto __ch = __pat[__i]; + using _UCh = std::make_unsigned_t<decltype(__ch)>; + auto __uch = static_cast<_UCh>(__ch); + std::get<0>(_M_bad_char)[__uch] = __patlen - 1 - __i; + } + } + + using __diff_type = _Tp; + + template<typename _Key> + __diff_type + _M_lookup(_Key __key, __diff_type __not_found) const + { + auto __ukey = static_cast<std::make_unsigned_t<_Key>>(__key); + if (__ukey >= _Len) + return __not_found; + return std::get<0>(_M_bad_char)[__ukey]; + } + + const _Pred& + _M_pred() const { return std::get<1>(_M_bad_char); } + + std::tuple<std::array<_Tp, _Len>, _Pred> _M_bad_char; + }; + + template<typename _Pred> + struct __is_std_equal_to : std::false_type { }; + + template<> + struct __is_std_equal_to<std::equal_to<void>> : std::true_type { }; + + // Use __boyer_moore_array_base when pattern consists of narrow characters + // and uses std::equal_to as the predicate. + template<typename _RAIter, typename _Hash, typename _Pred, + typename _Val = typename iterator_traits<_RAIter>::value_type, + typename _Diff = typename iterator_traits<_RAIter>::difference_type> + using __boyer_moore_base_t + = std::conditional_t<sizeof(_Val) == 1 && is_integral<_Val>::value + && __is_std_equal_to<_Pred>::value, + __boyer_moore_array_base<_Diff, 256, _Pred>, + __boyer_moore_map_base<_Val, _Diff, _Hash, _Pred>>; + + template<typename _RAIter, typename _Hash + = std::hash<typename std::iterator_traits<_RAIter>::value_type>, + typename _BinaryPredicate = std::equal_to<>> + class boyer_moore_searcher + : __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate> + { + using _Base = __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>; + using typename _Base::__diff_type; + + public: + boyer_moore_searcher(_RAIter __pat_first, _RAIter __pat_last, + _Hash __hf = _Hash(), + _BinaryPredicate __pred = _BinaryPredicate()); + + template<typename _RandomAccessIterator2> + pair<_RandomAccessIterator2, _RandomAccessIterator2> + operator()(_RandomAccessIterator2 __first, + _RandomAccessIterator2 __last) const; + + private: + bool + _M_is_prefix(_RAIter __word, __diff_type __len, + __diff_type __pos) + { + const auto& __pred = this->_M_pred(); + __diff_type __suffixlen = __len - __pos; + for (__diff_type __i = 0; __i < __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& __pred = this->_M_pred(); + __diff_type __i = 0; + while (__pred(__word[__pos - __i], __word[__len - 1 - __i]) + && __i < __pos) + { + ++__i; + } + return __i; + } + + template<typename _Tp> + __diff_type + _M_bad_char_shift(_Tp __c) const + { return this->_M_lookup(__c, _M_pat_end - _M_pat); } + + _RAIter _M_pat; + _RAIter _M_pat_end; + std::vector<__diff_type> _M_good_suffix; + }; + + template<typename _RAIter, typename _Hash + = std::hash<typename std::iterator_traits<_RAIter>::value_type>, + typename _BinaryPredicate = std::equal_to<>> + class boyer_moore_horspool_searcher + : __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate> + { + using _Base = __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>; + 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<typename _RandomAccessIterator2> + pair<_RandomAccessIterator2, _RandomAccessIterator2> + operator()(_RandomAccessIterator2 __first, + _RandomAccessIterator2 __last) const + { + const auto& __pred = this->_M_pred(); + auto __patlen = _M_pat_end - _M_pat; + if (__patlen == 0) + return std::make_pair(__first, __first); + auto __len = __last - __first; + while (__len >= __patlen) + { + for (auto __scan = __patlen - 1; + __pred(__first[__scan], _M_pat[__scan]); --__scan) + if (__scan == 0) + return std::make_pair(__first, + std::next(__first, __patlen)); + auto __shift = _M_bad_char_shift(__first[__patlen - 1]); + __len -= __shift; + __first += __shift; + } + return std::make_pair(__last, __last); + } + + private: + template<typename _Tp> + __diff_type + _M_bad_char_shift(_Tp __c) const + { return this->_M_lookup(__c, _M_pat_end - _M_pat); } + + _RAIter _M_pat; + _RAIter _M_pat_end; + }; + + /// Generator function for default_searcher + template<typename _ForwardIterator, + typename _BinaryPredicate = std::equal_to<>> + inline default_searcher<_ForwardIterator, _BinaryPredicate> + 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<typename _RAIter, typename _Hash + = std::hash<typename std::iterator_traits<_RAIter>::value_type>, + typename _BinaryPredicate = equal_to<>> + inline boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate> + 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<typename _RAIter, typename _Hash + = std::hash<typename std::iterator_traits<_RAIter>::value_type>, + typename _BinaryPredicate = equal_to<>> + inline boyer_moore_horspool_searcher<_RAIter, _Hash, _BinaryPredicate> + 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<typename _RAIter, typename _Hash, typename _BinaryPredicate> + boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>:: + 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 >= 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 < __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<typename _RAIter, typename _Hash, typename _BinaryPredicate> + template<typename _RandomAccessIterator2> + pair<_RandomAccessIterator2, _RandomAccessIterator2> + boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>:: + operator()(_RandomAccessIterator2 __first, + _RandomAccessIterator2 __last) const + { + auto __patlen = _M_pat_end - _M_pat; + if (__patlen == 0) + return std::make_pair(__first, __first); + const auto& __pred = this->_M_pred(); + __diff_type __i = __patlen - 1; + auto __stringlen = __last - __first; + while (__i < __stringlen) + { + __diff_type __j = __patlen - 1; + while (__j >= 0 && __pred(__first[__i], _M_pat[__j])) + { + --__i; + --__j; + } + if (__j < 0) + return std::make_pair(__first + __i + 1, std::next(__first, + __patlen)); + __i += std::max(_M_bad_char_shift(__first[__i]), + _M_good_suffix[__j]); + } + return std::make_pair(__last, __last); + } + #endif _GLIBCXX_END_NAMESPACE_VERSION |