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// Gmsh - Copyright (C) 1997-2020 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
#ifndef LINEAR_SYSTEM_H
#define LINEAR_SYSTEM_H
#include <map>
#include <string>
// A class that encapsulates a linear system solver interface :
// building a sparse matrix, solving a linear system
class linearSystemBase {
protected:
std::map<std::string, std::string> _parameters;
public:
virtual ~linearSystemBase() {}
virtual bool isAllocated() const = 0;
virtual void allocate(int nbRows) = 0;
virtual void preAllocateEntries(){};
virtual void clear() = 0;
virtual void zeroMatrix() = 0;
virtual void zeroRightHandSide() = 0;
virtual void zeroSolution() = 0;
virtual int systemSolve() = 0;
// x = A*b
virtual int matMult() { return 0; }
void setParameter(const std::string &key, std::string value);
std::string getParameter(const std::string &key) const;
virtual void insertInSparsityPattern(int _row, int _col){};
virtual double normInfRightHandSide() const = 0;
virtual double normInfSolution() const { return 0; };
};
template <class scalar> class linearSystem : public linearSystemBase {
public:
linearSystem() {}
virtual ~linearSystem() {}
virtual void addToMatrix(int _row, int _col, const scalar &val) = 0;
virtual void getFromMatrix(int _row, int _col, scalar &val) const = 0;
virtual void addToRightHandSide(int _row, const scalar &val, int ith = 0) = 0;
virtual void getFromRightHandSide(int _row, scalar &val) const = 0;
virtual void getFromSolution(int _row, scalar &val) const = 0;
virtual void addToSolution(int _row, const scalar &val) = 0;
};
#endif
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