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Check liveness of bits when computing slice iterator (#1707)
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| // Copyright 2019-2024 Cambridge Quantum Computing | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #pragma once | ||
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| #include <memory> | ||
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| #include "tket/Circuit/DAGDefs.hpp" | ||
| #include "tket/Utils/SequencedContainers.hpp" | ||
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| namespace tket { | ||
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| typedef VertexVec Slice; | ||
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| typedef sequenced_map_t<UnitID, Edge> unit_frontier_t; | ||
| // typedef sequenced_map_t<Qubit, Edge> q_frontier_t; | ||
| typedef sequenced_map_t<Bit, EdgeVec> b_frontier_t; | ||
| // typedef sequenced_map_t<Bit, Edge> c_frontier_t; | ||
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| struct CutFrontier { | ||
| std::shared_ptr<Slice> slice; | ||
| std::shared_ptr<unit_frontier_t> u_frontier; | ||
| std::shared_ptr<b_frontier_t> b_frontier; | ||
| void init() { | ||
| slice = std::make_shared<Slice>(); | ||
| u_frontier = std::make_shared<unit_frontier_t>(); | ||
| b_frontier = std::make_shared<b_frontier_t>(); | ||
| } | ||
| }; | ||
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| class Circuit; | ||
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| /*SliceIterator class is used for lazy evaluation of slices */ | ||
| class SliceIterator { | ||
| public: // these are currently public to allow skip_func slicing. | ||
| CutFrontier cut_; | ||
| std::shared_ptr<b_frontier_t> prev_b_frontier_; | ||
| const Circuit *circ_; | ||
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| class Sliceholder { | ||
| private: | ||
| Slice current_slice_; | ||
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| public: | ||
| explicit Sliceholder(Slice slice) : current_slice_(slice) {} | ||
| Slice operator*() const { return current_slice_; } | ||
| }; | ||
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| // take in an unsigned 'n' and a circuit and give the 'n'th slice | ||
| // note: n=0 gives an empty SliceIterator | ||
| // n=1 gives the first slice | ||
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| SliceIterator( | ||
| const Circuit &circ, const std::function<bool(Op_ptr)> &skip_func); | ||
| explicit SliceIterator(const Circuit &circ); | ||
| SliceIterator() : cut_(), circ_() { cut_.init(); } | ||
| Slice operator*() const { return *cut_.slice; } | ||
| bool operator==(const SliceIterator &other) const { | ||
| return *cut_.slice == *other.cut_.slice; | ||
| } | ||
| bool operator!=(const SliceIterator &other) const { | ||
| return !(*this == other); | ||
| } | ||
| std::shared_ptr<const unit_frontier_t> get_u_frontier() const { | ||
| return cut_.u_frontier; | ||
| } | ||
| std::shared_ptr<const b_frontier_t> get_b_frontier() const { | ||
| return cut_.b_frontier; | ||
| } | ||
| std::shared_ptr<const b_frontier_t> get_prev_b_frontier() const { | ||
| return prev_b_frontier_; | ||
| } | ||
| // A postfix increment operator overload | ||
| Sliceholder operator++(int); | ||
| // A prefix increment operator overload | ||
| SliceIterator &operator++(); | ||
| bool finished() const; | ||
| }; | ||
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| } // namespace tket |
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