Fortran Wiki
c_associated

Description

c_associated(c_prt_1[, c_ptr_2]) determines the status of the C pointer c_ptr_1 or if c_ptr_1 is associated with the target c_ptr_2.

Standard

Fortran 2003 and later

Class

Inquiry function

Syntax

result = c_associated(c_prt_1[, c_ptr_2])

Arguments

• c_ptr_1 - Scalar of the type c_ptr or c_funptr.
• c_ptr_2 - (Optional) Scalar of the same type as c_ptr_1.

Return value

The return value is of type logical; it is .false. if either c_ptr_1 is a C NULL pointer or if c_ptr1 and c_ptr_2 point to different addresses.

Example

subroutine association_test(a,b)
  use iso_c_binding, only: c_associated, c_loc, c_ptr
  implicit none
  real, pointer :: a
  type(c_ptr) :: b
  if(c_associated(b, c_loc(a))) &
     stop 'b and a do not point to same target'
end subroutine association_test

See also

c_loc, c_funloc, iso_c_binding