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58 lines
2.0 KiB
58 lines
2.0 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LIBTEXTCLASSIFIER_UTILS_CONTAINER_BIT_VECTOR_H_
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#define LIBTEXTCLASSIFIER_UTILS_CONTAINER_BIT_VECTOR_H_
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#include <set>
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#include <vector>
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#include "utils/base/integral_types.h"
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#include "utils/container/bit-vector_generated.h"
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namespace libtextclassifier3 {
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// A read-only bit vector. It does not own the data and it is like a view on
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// the given data. There are two internal representations, sparse and dense.
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// The dense one stores every bits. The sparse stores only the indices of
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// elements that are 1.
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class BitVector {
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public:
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explicit BitVector(const BitVectorData* bit_vector_data);
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// Gets a particular bit. If the underlying data does not contain the
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// value of the asked bit, false is returned.
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const bool operator[](int index) const { return Get(index); }
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// Creates a BitVectorDataT using the dense representation.
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static std::unique_ptr<BitVectorDataT> CreateDenseBitVectorData(
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const std::vector<bool>& data);
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// Creates a BitVectorDataT using the sparse representation.
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static std::unique_ptr<BitVectorDataT> CreateSparseBitVectorData(
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const std::vector<int32>& indices);
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private:
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const BitVectorData* bit_vector_data_;
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bool Get(int index) const;
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bool GetFromSparseData(int index) const;
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bool GetFromDenseData(int index) const;
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};
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} // namespace libtextclassifier3
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#endif // LIBTEXTCLASSIFIER_UTILS_CONTAINER_BIT_VECTOR_H_
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