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PROGRAM quadratures
INTERFACE
FUNCTION integrate(ibeg, iend, myfun, p) result(value)
IMPLICIT none
! beginning of integration interval
real(kind=8), intent(in) :: ibeg
! ending of integration interval
real(kind=8), intent(in) :: iend
! function to be integrated
procedure(funint) :: myfun
! polynomial order
integer(kind=4), intent(in) :: p
! result of integration
real(kind=8) :: value
END FUNCTION integrate
END INTERFACE
INTERFACE
FUNCTION funint(x) result(y)
IMPLICIT none
real(kind=8), intent(in) :: x
real(kind=8) :: y
END FUNCTION funint
END INTERFACE
procedure(funint), pointer :: ptr
ptr => my_exp
write(*,*) my_exp(2.0_8)
CONTAINS
FUNCTION my_exp(x) result(y)
real(kind=8), intent(in) :: x
real(kind=8) :: y
y = exp(x)
END FUNCTION my_exp
END PROGRAM quadratures
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