#include <petsc/private/snesimpl.h>



#define PetscScalarNorm(a,b) (PetscSqrtScalar((a)*(a)+(b)*(b)))
/*
   Private context for semismooth newton method with line search for solving
   system of mixed complementarity equations
 */

#if !defined(__SNES_VISS_H)
#define __SNES_VISS_H

typedef struct {
  Vec         phi;                 /* pointer to semismooth function */
  PetscReal   phinorm;             /* 2-norm of the semismooth function */
  PetscReal   merit;               /* Merit function */
  Vec         dpsi;                /* Merit function gradient */
  Vec         Da;                  /* B sub-differential work vector (diag perturbation) */
  Vec         Db;                  /* B sub-differential work vector (row scaling) */
  Vec         z;                   /* B subdifferential work vector */
  Vec         t;                   /* B subdifferential work vector */
  PetscScalar norm_d;              /* two norm of the descent direction */

  /* Copy of user supplied function evaluation routine  */
  PetscErrorCode (*computeuserfunction)(SNES,Vec,Vec,void*);
  /* user supplied function for checking redundant equations for SNESSolveVI_RS2 */
  PetscErrorCode (*checkredundancy)(SNES,IS,IS*,void*);
} SNES_VINEWTONSSLS;

#endif