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| // | ||
| // libsemigroups - C++ library for semigroups and monoids | ||
| // Copyright (C) 2024 James D. Mitchell | ||
| // | ||
| // This program 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 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // This program 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. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| // | ||
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| // This file contains an implementation of a range object for producing normal | ||
| // forms for a Kambites object. | ||
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| #ifndef LIBSEMIGROUPS_DETAIL_KAMBITES_NF_HPP_ | ||
| #define LIBSEMIGROUPS_DETAIL_KAMBITES_NF_HPP_ | ||
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| namespace detail { | ||
| template <typename Word> | ||
| class KambitesNormalFormRange { | ||
| private: | ||
| mutable typename Kambites<Word>::native_word_type _current; | ||
| FroidurePinBase::const_normal_form_iterator _end; | ||
| std::unique_ptr<FroidurePinBase> _fpb; | ||
| FroidurePinBase::const_normal_form_iterator _it; | ||
| Kambites<Word>* _k; | ||
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| public: | ||
| using output_type = typename Kambites<Word>::native_word_type const&; | ||
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| KambitesNormalFormRange() = delete; | ||
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| explicit KambitesNormalFormRange(Kambites<Word>& k) | ||
| : _current(), _end(), _fpb(), _it(), _k() { | ||
| init(k); | ||
| } | ||
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| KambitesNormalFormRange& init(Kambites<Word>& k) { | ||
| _current.clear(); | ||
| _fpb = to_froidure_pin(k); | ||
| _it = _fpb->cbegin_current_normal_forms(); | ||
| _k = &k; | ||
| _end = _fpb->cend_current_normal_forms(); | ||
| return *this; | ||
| } | ||
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| KambitesNormalFormRange(KambitesNormalFormRange const& that) | ||
| : KambitesNormalFormRange(*that._k) {} | ||
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| KambitesNormalFormRange(KambitesNormalFormRange&& that) = default; | ||
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| KambitesNormalFormRange& operator=(KambitesNormalFormRange const& that) { | ||
| return init(*that._k); | ||
| } | ||
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| KambitesNormalFormRange& operator=(KambitesNormalFormRange&&) = default; | ||
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| // TODO(0) init? | ||
| // TODO(1) allow setting of min/max etc like Paths | ||
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| output_type get() const { | ||
| // TODO don't do this more than once per call | ||
| auto const& w = *_it; | ||
| _current.clear(); | ||
| for (auto c : w) { | ||
| _current.push_back(_k->presentation().letter_no_checks(c)); | ||
| } | ||
| return _current; | ||
| } | ||
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| void next() { | ||
| ++_it; | ||
| if (_it == _end) { | ||
| _fpb->enumerate(_fpb->current_size() + 1); | ||
| _end = _fpb->cend_current_normal_forms(); | ||
| } | ||
| } | ||
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| [[nodiscard]] bool at_end() const { | ||
| return false; | ||
| } | ||
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| [[nodiscard]] uint64_t size_hint() const { | ||
| return POSITIVE_INFINITY; | ||
| } | ||
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| [[nodiscard]] uint64_t count() const { | ||
| return size_hint(); | ||
| } | ||
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| static constexpr bool is_finite = false; | ||
| static constexpr bool is_idempotent = true; | ||
| }; | ||
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| template <typename Word> | ||
| KambitesNormalFormRange(Kambites<Word>&) -> KambitesNormalFormRange<Word>; | ||
|
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| } // namespace detail | ||
| #endif // LIBSEMIGROUPS_DETAIL_KAMBITES_NF_HPP_ |
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include/libsemigroups/detail/kambites-normal-form-range.hpp
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