ROL_TypeU_Algorithm.hpp

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// @HEADER
// *****************************************************************************
//               Rapid Optimization Library (ROL) Package
//
// Copyright 2014 NTESS and the ROL contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER
 
#ifndef ROL_TYPEU_ALGORITHM_H
#define ROL_TYPEU_ALGORITHM_H
 
#include "ROL_CombinedStatusTest.hpp"
#include "ROL_Objective.hpp"
#include "ROL_Constraint.hpp"
#include "ROL_Problem.hpp"

 
namespace ROL {
namespace TypeU { 
 
template<typename Real>
struct AlgorithmState : public ROL::AlgorithmState<Real> {
  Real searchSize;
  Ptr<Vector<Real>> stepVec;
  Ptr<Vector<Real>> gradientVec;
 
  AlgorithmState()
    : searchSize(1),
      stepVec(nullPtr),
      gradientVec(nullPtr) {}
 
  void reset() {
    ROL::AlgorithmState<Real>::reset();
    searchSize = static_cast<Real>(1);
    if (stepVec != nullPtr) {
      stepVec->zero();
    }
    if (gradientVec != nullPtr) {
      gradientVec->zero();
    }
  }
};
 
template<typename Real>
class Algorithm {
protected:
  const Ptr<CombinedStatusTest<Real>> status_;
  const Ptr<AlgorithmState<Real>>   state_;
 
  void initialize(const Vector<Real> &x, const Vector<Real> &g); 
 
public:
 
  virtual ~Algorithm() {}

  Algorithm();
 
  void setStatusTest(const Ptr<StatusTest<Real>> &status,
                     bool combineStatus = false);

  virtual void run( Problem<Real> &problem,
                    std::ostream &outStream = std::cout );

  virtual void run( Vector<Real>    &x,
                    Objective<Real> &obj,
                    std::ostream    &outStream = std::cout );

  virtual void run( Vector<Real>     &x,
                    Objective<Real>  &obj,
                    Constraint<Real> &linear_con,
                    Vector<Real>     &linear_mul,
                    std::ostream     &outStream = std::cout );

  virtual void run( Vector<Real>       &x,
                    const Vector<Real> &g,
                    Objective<Real>    &obj,
                    Constraint<Real>   &linear_con,
                    Vector<Real>       &linear_mul,
                    const Vector<Real> &linear_c,
                    std::ostream       &outStream = std::cout );

  virtual void run( Vector<Real>       &x,
                    const Vector<Real> &g, 
                    Objective<Real>    &obj,
                    std::ostream       &outStream = std::cout) = 0;

  virtual void writeHeader( std::ostream& os ) const;

  virtual void writeName( std::ostream& os ) const;

  virtual void writeOutput( std::ostream& os, const bool write_header = false ) const;
 
  virtual void writeExitStatus( std::ostream& os ) const;
 
  //Ptr<const AlgorithmState<Real>>& getState() const;
  Ptr<const AlgorithmState<Real>> getState() const;
 
  void reset();
 
}; // class ROL::TypeU::Algorithm
} // namespace TypeU
} // namespace ROL
 
#include "ROL_TypeU_Algorithm_Def.hpp"
 
#endif