ROL_StatusTest.hpp

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#ifndef ROL_STATUSTEST_H
#define ROL_STATUSTEST_H
 
#include "ROL_Types.hpp"
#include "ROL_ParameterList.hpp"
 
namespace ROL {
 
template <class Real>
class StatusTest {
private:
 
  Real gtol_;
  Real stol_;
  int  max_iter_;
 
public:
 
  virtual ~StatusTest() {}
 
  StatusTest( ROL::ParameterList &parlist ) {
    Real em6(1e-6);
    gtol_     = parlist.sublist("Status Test").get("Gradient Tolerance", em6);
    stol_     = parlist.sublist("Status Test").get("Step Tolerance", em6*gtol_);
    max_iter_ = parlist.sublist("Status Test").get("Iteration Limit", 100);
  }
 
  StatusTest( Real gtol = 1.e-6, Real stol = 1.e-12, int max_iter = 100 ) :  
    gtol_(gtol), stol_(stol), max_iter_(max_iter) {}
 
  virtual bool check( AlgorithmState<Real> &state ) {
     if ( (state.gnorm > gtol_) && 
          (state.snorm > stol_) && 
          (state.iter  < max_iter_) ) {
       return true;
     }
     else {
       state.statusFlag = (state.gnorm <= gtol_ ? EXITSTATUS_CONVERGED
                           : state.snorm <= stol_ ? EXITSTATUS_STEPTOL
                           : state.iter >= max_iter_ ? EXITSTATUS_MAXITER
                           : std::isnan(state.gnorm)||std::isnan(state.snorm) ? EXITSTATUS_NAN
                           : EXITSTATUS_LAST);
       return false;
     }
  }
 
}; // class StatusTest
 
} // namespace ROL
 
#endif