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!$Id: lhapdf.f90 6133 2014-09-17 14:42:33Z kilian $
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! Copyright (C) 1999-2017 by
! Wolfgang Kilian <kilian@physik.uni-siegen.de>
! Thorsten Ohl <ohl@physik.uni-wuerzburg.de>
! Juergen Reuter <juergen.reuter@desy.de>
! with contributions from
! Bijan Chokoufe <bijan.chokoufe@desy.de>
! Fabian Bach <fabian.bach@t-online.de>
! Christian Speckner <cnspeckn@googlemail.com>
!
! WHIZARD is free software; you can redistribute it and/or modify it
! under the terms of the GNU General Public License as published by
! the Free Software Foundation; either version 2, or (at your option)
! any later version.
!
! WHIZARD is distributed in the hope that it will be useful, but
! WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License
! along with this program; if not, write to the Free Software
! Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
module lhapdf
use, intrinsic :: iso_c_binding
use kinds
implicit none
private
! Public types
public :: lhapdf_pdf_t
public :: lhapdf_copy_pointer
type :: lhapdf_pdf_t
private
type(c_ptr) :: cptr
contains
procedure :: init => lhapdf_pdf_init
procedure :: is_associated => lhapdf_is_associated
procedure :: getxmin => lhapdf_getxmin
procedure :: getxmax => lhapdf_getxmax
procedure :: getq2min => lhapdf_getq2min
procedure :: getq2max => lhapdf_getq2max
procedure :: has_photon => lhapdf_hasphoton
procedure :: evolve_pdfm => lhapdf_evolve_pdfm
procedure :: evolve_pdfphotonm => lhapdf_evolve_pdfphotonm
procedure :: evolve_pdfpm => lhapdf_evolve_pdfpm
procedure :: get_qmass => lhapdf_get_qmass
procedure :: num_pdfm => lhapdf_num_pdfm
procedure :: alphas_pdf => lhapdf_alphas_pdf
procedure :: final => lhapdf_final
end type lhapdf_pdf_t
! Interface for generic operators
interface
function lhapdf_init_pdf (setname, imem) bind (C) result (pdf)
import
integer(c_int), intent(in), value :: imem
character(len=1, kind=c_char), dimension(*), intent(in) :: setname
type(c_ptr) :: pdf
end function lhapdf_init_pdf
end interface
interface
subroutine lhapdf_pdf_delete (pdf) bind (C)
import
type(c_ptr), value :: pdf
end subroutine lhapdf_pdf_delete
end interface
interface
function lhapdf_pdf_getxmin (pdf) bind (C) result (xmin)
import
type(c_ptr), intent(in), value :: pdf
real(c_double) :: xmin
end function lhapdf_pdf_getxmin
end interface
interface
function lhapdf_pdf_getxmax (pdf) bind (C) result (xmax)
import
type(c_ptr), intent(in), value :: pdf
real(c_double) :: xmax
end function lhapdf_pdf_getxmax
end interface
interface
function lhapdf_pdf_getq2min (pdf) bind (C) result (q2min)
import
type(c_ptr), intent(in), value :: pdf
real(c_double) :: q2min
end function lhapdf_pdf_getq2min
end interface
interface
function lhapdf_pdf_getq2max (pdf) bind (C) result (q2max)
import
type(c_ptr), intent(in), value :: pdf
real(c_double) :: q2max
end function lhapdf_pdf_getq2max
end interface
interface
function lhapdf_has_photon (pdf) bind (C) result (flag)
import
type(c_ptr), intent(in), value :: pdf
logical(c_bool) :: flag
end function lhapdf_has_photon
end interface
interface
subroutine lhapdf_evolvepdfm (pdf, x, q, ff) bind (C)
import
type(c_ptr), intent(in), value :: pdf
real(c_double), intent(in), value :: x, q
real(c_double), dimension(-6:6), intent(out) :: ff
end subroutine lhapdf_evolvepdfm
end interface
interface
subroutine lhapdf_evolvepdfphotonm (pdf, x, q, ff, fphot) bind (C)
import
type(c_ptr), intent(in), value :: pdf
real(c_double), intent(in), value :: x, q
real(c_double), dimension(-6:6), intent(out) :: ff
real(c_double), intent(out) :: fphot
end subroutine lhapdf_evolvepdfphotonm
end interface
interface
subroutine lhapdf_evolvepdfpm (pdf, x, q, s, scheme, ff) bind (C)
import
type(c_ptr), intent(in), value :: pdf
integer(c_int), intent(in), value :: scheme
real(c_double), intent(in), value :: x, q, s
real(c_double), dimension(-6:6), intent(out) :: ff
end subroutine lhapdf_evolvepdfpm
end interface
interface
function lhapdf_getqmass (pdf, nf) bind (C) result (mass)
import
type(c_ptr), intent(in), value :: pdf
integer(c_int), intent(in), value :: nf
real(c_double) :: mass
end function lhapdf_getqmass
end interface
interface
function lhapdf_numpdfm (pdf) bind (C) result (numpdf)
import
type(c_ptr), intent(in), value :: pdf
integer(c_int) :: numpdf
end function lhapdf_numpdfm
end interface
interface
function lhapdf_alphaspdf (pdf, q) bind (C) result (as)
import
type(c_ptr), intent(in), value :: pdf
real(c_double), intent(in), value :: q
real(c_double) :: as
end function lhapdf_alphaspdf
end interface
contains
subroutine lhapdf_pdf_init (pdf, setname, imem)
class(lhapdf_pdf_t), intent(out) :: pdf
character(*), intent(in) :: setname
integer, intent(in) :: imem
character(len=1, kind=c_char), dimension(len(setname)+1) :: pdf_setname
integer(c_int) :: pdf_imem
integer :: i, strlen
strlen = len(setname)
forall (i=1:strlen)
pdf_setname(i) = setname(i:i)
end forall
pdf_setname(strlen+1) = c_null_char
pdf_imem = imem
pdf%cptr = lhapdf_init_pdf (pdf_setname, pdf_imem)
end subroutine lhapdf_pdf_init
function lhapdf_is_associated (pdf) result (flag)
class(lhapdf_pdf_t), intent(in) :: pdf
logical :: flag
flag = c_associated (pdf%cptr)
end function lhapdf_is_associated
function lhapdf_getxmin (pdf) result (xmin)
class(lhapdf_pdf_t), intent(inout) :: pdf
real(double) :: xmin
xmin = lhapdf_pdf_getxmin (pdf%cptr)
end function lhapdf_getxmin
function lhapdf_getxmax (pdf) result (xmax)
class(lhapdf_pdf_t), intent(inout) :: pdf
real(double) :: xmax
xmax = lhapdf_pdf_getxmax (pdf%cptr)
end function lhapdf_getxmax
function lhapdf_getq2min (pdf) result (q2min)
class(lhapdf_pdf_t), intent(inout) :: pdf
real(double) :: q2min
q2min = lhapdf_pdf_getq2min (pdf%cptr)
end function lhapdf_getq2min
function lhapdf_getq2max (pdf) result (q2max)
class(lhapdf_pdf_t), intent(inout) :: pdf
real(double) :: q2max
q2max = lhapdf_pdf_getq2max (pdf%cptr)
end function lhapdf_getq2max
function lhapdf_hasphoton (pdf) result (flag)
class(lhapdf_pdf_t), intent(inout) :: pdf
logical :: flag
flag = lhapdf_has_photon (pdf%cptr)
end function lhapdf_hasphoton
subroutine lhapdf_evolve_pdfm (pdf, x, q, ff)
class(lhapdf_pdf_t), intent(inout) :: pdf
real(double), intent(in) :: x, q
real(double), dimension(-6:6), intent(out) :: ff
real(c_double) :: c_x, c_q
c_x = x
c_q = q
call lhapdf_evolvepdfm (pdf%cptr, c_x, c_q, ff)
end subroutine lhapdf_evolve_pdfm
subroutine lhapdf_evolve_pdfphotonm (pdf, x, q, ff, fphot)
class(lhapdf_pdf_t), intent(inout) :: pdf
real(double), intent(in) :: x, q
real(double), dimension(-6:6), intent(out) :: ff
real(double), intent(out) :: fphot
real(c_double) :: c_x, c_q
c_x = x
c_q = q
call lhapdf_evolvepdfphotonm &
(pdf%cptr, c_x, c_q, ff, fphot)
end subroutine lhapdf_evolve_pdfphotonm
subroutine lhapdf_evolve_pdfpm (pdf, x, q, s, scheme, ff)
class(lhapdf_pdf_t), intent(inout) :: pdf
real(double), intent(in) :: x, q, s
integer, intent(in) :: scheme
real(double), dimension(-6:6), intent(out) :: ff
real(c_double) :: c_x, c_q, c_s
integer(c_int) :: c_scheme
c_x = x
c_q = q
c_s = s
c_scheme = scheme
call lhapdf_evolvepdfpm (pdf%cptr, &
c_x, c_q, c_s, c_scheme, ff)
end subroutine lhapdf_evolve_pdfpm
function lhapdf_get_qmass (pdf, nf) result (mass)
class(lhapdf_pdf_t), intent(inout) :: pdf
integer, intent(in) :: nf
real(double) :: mass
integer(c_int) :: c_nf
c_nf = nf
mass = lhapdf_getqmass (pdf%cptr, c_nf)
end function lhapdf_get_qmass
function lhapdf_num_pdfm (pdf) result (numpdf)
class(lhapdf_pdf_t), intent(inout) :: pdf
integer :: numpdf
numpdf = lhapdf_numpdfm (pdf%cptr)
end function lhapdf_num_pdfm
function lhapdf_alphas_pdf (pdf, q) result (as)
class(lhapdf_pdf_t), intent(in), target :: pdf
real(double), intent(in) :: q
real(double) :: as
real(c_double) :: c_q = 0
c_q = q
as = lhapdf_alphaspdf (pdf%cptr, c_q)
end function lhapdf_alphas_pdf
subroutine lhapdf_final (pdf)
class(lhapdf_pdf_t), intent(inout) :: pdf
call lhapdf_pdf_delete (pdf%cptr)
end subroutine lhapdf_final
subroutine lhapdf_copy_pointer (pdf_in, pdf_out)
type(lhapdf_pdf_t), intent(in), target :: pdf_in
type(lhapdf_pdf_t), intent(out), target :: pdf_out
pdf_out%cptr = transfer (pdf_in%cptr, pdf_out%cptr)
end subroutine lhapdf_copy_pointer
end module lhapdf

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