Lahey/GNU Fortran

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8.42 C_LOC — Obtain the C address of an object

Description:
C_LOC(X) determines the C address of the argument.
Standard:
Fortran 2003 and later
Class:
Inquiry function
Syntax:
RESULT = C_LOC(X)
Arguments:

X Shall have either the POINTER or TARGET attribute. It shall not be a coindexed object. It shall either be a variable with interoperable type and kind type parameters, or be a scalar, nonpolymorphic variable with no length type parameters.

Return value:
The return value is of type C_PTR and contains the C address of the argument.
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_ASSOCIATED, C_FUNLOC, C_F_POINTER, C_F_PROCPOINTER