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Manual Reference Pages  - c_associated (3fortran)

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NAME

C_ASSOCIATED(3) - [ISO_C_BINDING] Status of a C pointer

SYNOPSIS

result = c_associated(c_prt_1, [c_ptr_2] )

         logical function c_associated(c_prt_1, cptr_2)

          TYPE,intent(in) ::c_ptr_1
          TYPE,intent(in),optional ::c_ptr_2

CHARACTERISTICS

o	C_PTR_1 is a scalar of the type c_ptr or c_funptr.
o	C_PTR_2 is a scalar of the same type as c_ptr_1.
o	The return value is of type logical

DESCRIPTION

C_ASSOCIATED(3) determines the status of the C pointer c_ptr_1 or if c_ptr_1 is associated with the target c_ptr_2.

OPTIONS

o	C_PTR_1 : C pointer to test for being a C NULL pointer, or to test if pointing to the same association as C_PTR_2 when present.
o	C_PTR_2 : C pointer to test for shared association with C_PTR_1

RESULT

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.

EXAMPLES

Sample program:

    program demo_c_associated

    contains

    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

    end program demo_c_associated

STANDARD

Fortran 2003

SEE ALSO

C_LOC(3), C_FUNLOC(3), ISO_C_BINDING(3)

fortran-lang intrinsic descriptions

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Nemo Release 3.1

c_associated (3fortran)

April 28, 2024

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