c  Mahc_Evolve: Numerical Evolution of the General Relativistic Hydro Equations
c  Copyright (C) 2001 Mark Miller

/*@@
  @file      Mahc_pred_apply_update.F
  @date      December 1999
  @author    Mark Miller
  @desc
     Apply the hydro update for the predictor step.
  @enddesc
@@*/

#include "cctk.h"
#include "cctk_Parameters.h"
#include "cctk_Arguments.h"


/*@@
  @routine    Mahc_pred_apply_update
  @date       December 1999
  @author     Mark Miller
  @desc
     Apply the hydro update for the predictor step.
  @enddesc
  @calls
  @calledby
  @history
  @endhistory
@@*/

      subroutine Mahc_pred_apply_update(CCTK_FARGUMENTS)
      implicit none
      DECLARE_CCTK_FARGUMENTS
      DECLARE_CCTK_PARAMETERS

      CCTK_REAL frac

      if(mahc_spacetime_icn .eq. 1) then
         frac = 0.5d0
      else
         frac = 1.0d0
      endif
      call apply_del_hydro(CCTK_FARGUMENTS,frac)
c      call CCTK_SyncGroup(cctkGH,"gen_rel_perfect_fluid::Mahc_evol_vars")
      return
      end