1: #define PETSC_USE_FORTRAN_MODULES 1
  2: #include <petsc/finclude/petscsysdef.h>
  3: #include <petsc/finclude/petscbagdef.h>
  4: #include <petsc/finclude/petscviewerdef.h>

  6:       module Bag_data_module
  7: !     Data structure used to contain information about the problem
  8: !     You can add physical values etc here

 10:       type tuple
 11:          PetscReal:: x1,x2
 12:       end type tuple

 14:       type bag_data_type
 15:          PetscScalar :: x
 16:          PetscReal :: y
 17:          PetscInt  :: nxc
 18:          PetscReal :: rarray(3)
 19:          PetscBool  :: t
 20:          PetscBool  :: tarray(3)
 21:          PetscEnum :: enum
 22:          character*(80) :: c
 23:          type(tuple) :: pos
 24:       end type bag_data_type
 25:       end module Bag_data_module

 27:       module Bag_interface_module
 28:       use Bag_data_module

 30:       interface PetscBagGetData
 31:          subroutine PetscBagGetData(bag,data,ierr)
 32:            use Bag_data_module
 33:            PetscBag bag
 34:            type(bag_data_type),pointer :: data
 35:            PetscErrorCode ierr
 36:          end subroutine PetscBagGetData
 37:       end interface
 38:       end module Bag_interface_module

 40:       program ex5f90
 41:       use Bag_interface_module
 42:       use petsc
 43:       implicit none

 45:       PetscBag bag
 46:       PetscErrorCode ierr
 47:       type(bag_data_type), pointer :: data
 48:       type(bag_data_type)          :: dummydata
 49:       character(len=1),pointer     :: dummychar(:)
 50:       PetscViewer viewer
 51:       PetscSizeT sizeofbag
 52:       Character(len=99) list(6)
 53:       PetscInt three,int56
 54:       PetscReal value
 55:       PetscScalar svalue

 57:       Call PetscInitialize(PETSC_NULL_CHARACTER,ierr)
 58:       list(1) = 'a123'
 59:       list(2) = 'b456'
 60:       list(3) = 'c789'
 61:       list(4) = 'list'
 62:       list(5) = 'prefix_'
 63:       list(6) = ''
 64: !     cannot just pass a 3 to PetscBagRegisterXXXArray() because it is expecting a PetscInt
 65:       three   = 3

 67: !   compute size of the data
 68: !
 69:       sizeofbag = size(transfer(dummydata,dummychar))


 72: ! create the bag
 73:       call PetscBagCreate(PETSC_COMM_WORLD,sizeofbag,bag,ierr)
 74:       call PetscBagGetData(bag,data,ierr)
 75:       call PetscBagSetName(bag,'demo parameters',                        &
 76:      &      'super secret demo parameters in a bag',ierr)
 77:       call PetscBagSetOptionsPrefix(bag, 'pbag_', ierr)

 79: ! register the data within the bag, grabbing values from the options database
 80: !     Need to put the value into a variable for 64 bit indices
 81:       int56 = 56
 82:       call PetscBagRegisterInt(bag,data%nxc ,int56,'nxc',                   &
 83:      &      'nxc_variable help message',ierr)
 84:       call PetscBagRegisterRealArray(bag,data%rarray,three,'rarray',         &
 85:      &      'rarray help message',ierr)
 86: !     Need to put the value into a variable to pass correctly for 128 bit quad precision numbers
 87:       svalue = 103.2d0
 88:       call PetscBagRegisterScalar(bag,data%x ,svalue,'x',                &
 89:      &      'x variable help message',ierr)
 90:       call PetscBagRegisterBool(bag,data%t ,PETSC_TRUE,'t',              &
 91:      &      't boolean help message',ierr)
 92:       call PetscBagRegisterBoolArray(bag,data%tarray,three,'tarray',         &
 93:      &      'tarray help message',ierr)
 94:       call PetscBagRegisterString(bag,data%c,'hello','c',                &
 95:      &      'string help message',ierr)
 96:       value = -11.0d0
 97:       call PetscBagRegisterReal(bag,data%y ,value,'y',                   &
 98:      &       'y variable help message',ierr)
 99:       value = 1.0d0
100:       call PetscBagRegisterReal(bag,data%pos%x1 ,value,'pos_x1',         &
101:      &      'tuple value 1 help message',ierr)
102:       value = 2.0d0
103:       call PetscBagRegisterReal(bag,data%pos%x2 ,value,'pos_x2',         &
104:      &      'tuple value 2 help message',ierr)
105:       call PetscBagRegisterEnum(bag,data%enum ,list,1,'enum',            &
106:      &      'tuple value 2 help message',ierr)
107:       call PetscBagView(bag,PETSC_VIEWER_STDOUT_WORLD,ierr)

109:       data%nxc = 23
110:       data%rarray(1) = -1.0
111:       data%rarray(2) = -2.0
112:       data%rarray(3) = -3.0
113:       data%x   = 155.4
114:       data%c   = 'a whole new string'
115:       data%t   = PETSC_TRUE
116:       data%tarray   = (/PETSC_TRUE,PETSC_FALSE,PETSC_TRUE/)
117:       call PetscBagView(bag,PETSC_VIEWER_BINARY_WORLD,ierr)

119:       call PetscViewerBinaryOpen(PETSC_COMM_WORLD,'binaryoutput',        &
120:      &      FILE_MODE_READ,viewer,ierr)
121:       call PetscBagLoad(viewer,bag,ierr)
122:       call PetscViewerDestroy(viewer,ierr)
123:       call PetscBagView(bag,PETSC_VIEWER_STDOUT_WORLD,ierr)

125:       call PetscBagSetFromOptions(bag,ierr)
126:       call PetscBagView(bag,PETSC_VIEWER_STDOUT_WORLD,ierr)
127:       call PetscBagDestroy(bag,ierr)

129:       call PetscFinalize(ierr)
130:       end program ex5f90