1c4762a1bSJed Brown! 2c4762a1bSJed Brown! Example usage of Fortran 2003/2008 classes (extended derived types) as 3c4762a1bSJed Brown! user-defined contexts in PETSc. Example contributed by Glenn Hammond. 4c4762a1bSJed Brown! 5*77d968b7SBarry Smithmodule ex18f90base_module 6c4762a1bSJed Brown#include "petsc/finclude/petscsnes.h" 7c4762a1bSJed Brown implicit none 8c4762a1bSJed Brown private 9c4762a1bSJed Brown 10c4762a1bSJed Brown type, public :: base_type 11c4762a1bSJed Brown PetscInt :: A ! junk 12c4762a1bSJed Brown PetscReal :: I ! junk 13c4762a1bSJed Brown contains 14c4762a1bSJed Brown procedure, public :: Print => BasePrint 15c4762a1bSJed Brown end type base_type 16c4762a1bSJed Browncontains 17c4762a1bSJed Brownsubroutine BasePrint(this) 18c4762a1bSJed Brown implicit none 19c4762a1bSJed Brown class(base_type) :: this 20c4762a1bSJed Brown print * 21c4762a1bSJed Brown print *, 'Base printout' 22c4762a1bSJed Brown print * 23c4762a1bSJed Brownend subroutine BasePrint 24*77d968b7SBarry Smithend module ex18f90base_module 25c4762a1bSJed Brown 26*77d968b7SBarry Smithmodule ex18f90extended_module 27*77d968b7SBarry Smith use ex18f90base_module 28c4762a1bSJed Brown implicit none 29c4762a1bSJed Brown private 30c4762a1bSJed Brown type, public, extends(base_type) :: extended_type 31c4762a1bSJed Brown PetscInt :: B ! junk 32c4762a1bSJed Brown PetscReal :: J ! junk 33c4762a1bSJed Brown contains 34c4762a1bSJed Brown procedure, public :: Print => ExtendedPrint 35c4762a1bSJed Brown end type extended_type 36c4762a1bSJed Browncontains 37c4762a1bSJed Brownsubroutine ExtendedPrint(this) 38c4762a1bSJed Brown implicit none 39c4762a1bSJed Brown class(extended_type) :: this 40c4762a1bSJed Brown print * 41c4762a1bSJed Brown print *, 'Extended printout' 42c4762a1bSJed Brown print * 43c4762a1bSJed Brownend subroutine ExtendedPrint 44*77d968b7SBarry Smithend module ex18f90extended_module 45c4762a1bSJed Brown 46*77d968b7SBarry Smithmodule ex18f90function_module 47c4762a1bSJed Brown use petscsnes 48c4762a1bSJed Brown implicit none 49c4762a1bSJed Brown public :: TestFunction 50c4762a1bSJed Brown contains 51c4762a1bSJed Brownsubroutine TestFunction(snes,xx,r,ctx,ierr) 52*77d968b7SBarry Smith use ex18f90base_module 53c4762a1bSJed Brown implicit none 54c4762a1bSJed Brown SNES :: snes 55c4762a1bSJed Brown Vec :: xx 56c4762a1bSJed Brown Vec :: r 57c4762a1bSJed Brown class(base_type) :: ctx ! yes, this should be base_type in order to handle all 58c4762a1bSJed Brown PetscErrorCode :: ierr ! polymorphic extensions 59c4762a1bSJed Brown call ctx%Print() 60c4762a1bSJed Brownend subroutine TestFunction 61*77d968b7SBarry Smithend module ex18f90function_module 62c4762a1bSJed Brown 63c4762a1bSJed Brownprogram ex18f90 64c4762a1bSJed Brown 65*77d968b7SBarry Smith use ex18f90base_module 66*77d968b7SBarry Smith use ex18f90extended_module 67*77d968b7SBarry Smith use ex18f90function_module 68c4762a1bSJed Brown implicit none 69c4762a1bSJed Brown 70c4762a1bSJed Brown! ifort on windows requires this interface definition 71c4762a1bSJed Browninterface 72c4762a1bSJed Brown subroutine SNESSetFunction(snes_base,x,TestFunction,base,ierr) 73*77d968b7SBarry Smith use ex18f90base_module 74c4762a1bSJed Brown use petscsnes 75c4762a1bSJed Brown SNES snes_base 76c4762a1bSJed Brown Vec x 77c4762a1bSJed Brown external TestFunction 78c4762a1bSJed Brown class(base_type) :: base 79c4762a1bSJed Brown PetscErrorCode ierr 80c4762a1bSJed Brown end subroutine 81c4762a1bSJed Brownend interface 82c4762a1bSJed Brown 83c4762a1bSJed Brown PetscMPIInt :: size 84c4762a1bSJed Brown PetscMPIInt :: rank 85c4762a1bSJed Brown 86c4762a1bSJed Brown SNES :: snes_base, snes_extended 87c4762a1bSJed Brown Vec :: x 88c4762a1bSJed Brown class(base_type), pointer :: base 89c4762a1bSJed Brown class(extended_type), pointer :: extended 90c4762a1bSJed Brown PetscErrorCode :: ierr 91c4762a1bSJed Brown 92c4762a1bSJed Brown print *, 'Start of Fortran2003 test program' 93c4762a1bSJed Brown 94c4762a1bSJed Brown nullify(base) 95c4762a1bSJed Brown nullify(extended) 96c4762a1bSJed Brown allocate(base) 97c4762a1bSJed Brown allocate(extended) 98d8606c27SBarry Smith PetscCallA(PetscInitialize(ierr)) 99d8606c27SBarry Smith PetscCallMPIA(MPI_Comm_size(PETSC_COMM_WORLD,size,ierr)) 100d8606c27SBarry Smith PetscCallMPIA(MPI_Comm_rank(PETSC_COMM_WORLD,rank,ierr)) 101c4762a1bSJed Brown 102d8606c27SBarry Smith PetscCallA(VecCreate(PETSC_COMM_WORLD,x,ierr)) 103c4762a1bSJed Brown 104c4762a1bSJed Brown ! use the base class as the context 105c4762a1bSJed Brown print * 106c4762a1bSJed Brown print *, 'the base class will succeed by printing out Base printout below' 107d8606c27SBarry Smith PetscCallA(SNESCreate(PETSC_COMM_WORLD,snes_base,ierr)) 108d8606c27SBarry Smith PetscCallA(SNESSetFunction(snes_base,x,TestFunction,base,ierr)) 109d8606c27SBarry Smith PetscCallA(SNESComputeFunction(snes_base,x,x,ierr)) 110d8606c27SBarry Smith PetscCallA(SNESDestroy(snes_base,ierr)) 111c4762a1bSJed Brown 112c4762a1bSJed Brown ! use the extended class as the context 113c4762a1bSJed Brown print *, 'the extended class will succeed by printing out Extended printout below' 114d8606c27SBarry Smith PetscCallA(SNESCreate(PETSC_COMM_WORLD,snes_extended,ierr)) 115d8606c27SBarry Smith PetscCallA(SNESSetFunction(snes_extended,x,TestFunction,extended,ierr)) 116d8606c27SBarry Smith PetscCallA(SNESComputeFunction(snes_extended,x,x,ierr)) 117d8606c27SBarry Smith PetscCallA(VecDestroy(x,ierr)) 118d8606c27SBarry Smith PetscCallA(SNESDestroy(snes_extended,ierr)) 119c4762a1bSJed Brown if (associated(base)) deallocate(base) 120c4762a1bSJed Brown if (associated(extended)) deallocate(extended) 121d8606c27SBarry Smith PetscCallA(PetscFinalize(ierr)) 122c4762a1bSJed Brown 123c4762a1bSJed Brown print *, 'End of Fortran2003 test program' 124c4762a1bSJed Brownend program ex18f90 125c4762a1bSJed Brown 126c4762a1bSJed Brown!/*TEST 127c4762a1bSJed Brown! 128c4762a1bSJed Brown! build: 129dfd57a17SPierre Jolivet! requires: defined(PETSC_USING_F2003) defined(PETSC_USING_F90FREEFORM) 130c4762a1bSJed Brown! test: 131c4762a1bSJed Brown! requires: !pgf90_compiler 132c4762a1bSJed Brown! 133c4762a1bSJed Brown!TEST*/ 134