ROL_TypeBIndicatorObjective.hpp

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#ifndef ROL_TYPEBINDICATOROBJECTIVE_H
#define ROL_TYPEBINDICATOROBJECTIVE_H
 
#include "ROL_Objective.hpp"
#include "ROL_PolyhedralProjectionFactory.hpp"

 
 
namespace ROL {
 
template<typename Real>
class TypeBIndicatorObjective : public Objective<Real> {
private:
  const Ptr<PolyhedralProjection<Real>> proj_;
  const Ptr<Vector<Real>> res_;
 
public:
 
  TypeBIndicatorObjective(const Ptr<BoundConstraint<Real>> &bnd)
    : proj_(makePtr<PolyhedralProjection<Real>>(bnd)) {}
 
  TypeBIndicatorObjective(const Vector<Real>               &xprim,
                          const Vector<Real>               &xdual,
                          const Ptr<BoundConstraint<Real>> &bnd,
                          const Ptr<Constraint<Real>>      &con,
                          const Vector<Real>               &mul,
                          const Vector<Real>               &res,
                          ParameterList                    &list)
    proj_(PolyhedralProjectionFactory<Real>(xprim,xdual,bnd,con,mul,res,list)),
    res_(res.clone()) {}
 
  TypeBIndicatorObjective(const Ptr<PolyhedralProjection<Real>> &proj)
    : proj_(proj), res_(proj->getResidual()->clone()) {}
 
  Real value( const Vector<Real> &x, Real &tol ) {
    const Real zero(0), eps(ROL_EPSILON<Real>());
    Real val(0);
    bool isBndFeasible = proj_->getBoundConstraint()->isFeasible(x); 
    bool isConFeasible = true;
    if (res_ != nullPtr) {
      proj_->getLinearConstraint()->value(*res_,x,tol);
      if (res_->norm() > eps) isConFeasible = false;
    }
    return (isBndFeasible && isConFeasible) ? zero : ROL_INF<Real>();
  }
 
  void prox( Vector<Real> &Pv, const Vector<Real> &v, Real t, Real &tol){
    Pv.set(v); proj_->project(Pv);
  }
}; // class TypeBIndicatorObjective
 
} // namespace ROL
 
#endif