67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
// Copyright 2010-2024 Google LLC
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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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#ifndef OR_TOOLS_LP_DATA_SPARSE_ROW_H_
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#define OR_TOOLS_LP_DATA_SPARSE_ROW_H_
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#include "ortools/base/strong_vector.h"
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#include "ortools/lp_data/sparse_vector.h"
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namespace operations_research {
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namespace glop {
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// Specialization of SparseVectorEntry and SparseVectorIterator for the
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// SparseRow class. In addition to index(), it also provides col() for better
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// readability on the client side.
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class SparseRowEntry : public SparseVectorEntry<ColIndex> {
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public:
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// Returns the row of the current entry.
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ColIndex col() const { return index(); }
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protected:
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SparseRowEntry(const ColIndex* indices, const Fractional* coefficients,
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EntryIndex i)
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: SparseVectorEntry<ColIndex>(indices, coefficients, i) {}
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};
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using SparseRowIterator = VectorIterator<SparseRowEntry>;
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// TODO(user): Use this class where appropriate, i.e. when a SparseColumn is
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// used to store a row vector (by means of RowIndex to ColIndex casting).
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// A SparseRow is a SparseVector<ColIndex>, with a few methods renamed
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// to help readability on the client side.
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class SparseRow : public SparseVector<ColIndex, SparseRowIterator> {
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public:
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SparseRow() : SparseVector<ColIndex, SparseRowIterator>() {}
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// Use a separate API to get the column and coefficient of entry #i.
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ColIndex EntryCol(EntryIndex i) const { return GetIndex(i); }
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Fractional EntryCoefficient(EntryIndex i) const { return GetCoefficient(i); }
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ColIndex GetFirstCol() const { return GetFirstIndex(); }
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ColIndex GetLastCol() const { return GetLastIndex(); }
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void ApplyColPermutation(const ColumnPermutation& p) {
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ApplyIndexPermutation(p);
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}
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void ApplyPartialColPermutation(const ColumnPermutation& p) {
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ApplyPartialIndexPermutation(p);
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}
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};
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// A matrix stored by rows.
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typedef util_intops::StrongVector<RowIndex, SparseRow> RowMajorSparseMatrix;
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} // namespace glop
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} // namespace operations_research
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#endif // OR_TOOLS_LP_DATA_SPARSE_ROW_H_
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