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Passing an allocatable character to a subroutine with unlimited polymorphic dummy argument in Fortran


Passing an allocatable character to a subroutine with unlimited polymorphic dummy argument in Fortran

By : user2949491
Date : November 17 2020, 01:00 AM
should help you out In a select type (or associate) construct, the associate name never has the allocatable attribute (16.5.1.6p2), regardless of whether the select has that attribute.
In your case, the selector is also lacking that attribute - the value dummy argument is not declared to be allocatable. You are not permitted to associate an unallocated actual argument with a non-optional non-allocatable dummy argument. Beyond that, you are not permitted to use an unallocated selector in a select type or associate construct.
code :


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fortran, passing allocatable arrays to a subroutine with right bounds

fortran, passing allocatable arrays to a subroutine with right bounds


By : Tess H
Date : March 29 2020, 07:55 AM
seems to work fine The first version passes the array slice to the subroutine. Note that boundary information are not passed along in this way, arrays are assumed to start at 1 and go to size(array).
The second way is just like the first one, but you manually set the lower boundary to 0, that's why printing v3(1:3) gives you the values with an offset of 1.
FORTRAN: pass unlimited polymorphic subroutine as arguments and other issues

FORTRAN: pass unlimited polymorphic subroutine as arguments and other issues


By : Robby Gunawan
Date : March 29 2020, 07:55 AM
hop of those help? There are no functions in your example code.
A procedure with a polymorphic argument requires an explicit interface for the procedure when the procedure is referenced or when such a procedure is a target is a pointer assignment statement. A pointer that references a procedure that requires an explicit interface must also have an explicit interface. This all practically means that you must always have an explicit interface in place for a procedure that requires an explicit interface if you ever want to use it.
code :
SUBROUTINE Func2_wrapper(A,B)
  CLASS(*), INTENT(IN) :: A
  CLASS(*), INTENT(OUT) :: B
  SELECT TYPE (A)
  TYPE IS (REAL)
    SELECT TYPE (B)
    TYPE IS (REAL)
      CALL Func2(A,B)
    END SELECT
  END SELECT
END SUBROUTINE Func2_wrapper
FORTRAN: passing a dummy argument to a subroutine

FORTRAN: passing a dummy argument to a subroutine


By : user3186638
Date : March 29 2020, 07:55 AM
this will help I am pretty new to Fortran and have a problem to solve. , You can use optional arguments in Fortran 90 and later.
code :
subroutine subroutinename(...,r,dr,d2r)
  real, optional :: d2r(:,:)

  if (present(d2r)) then
    !do the computation
  end if
call subroutinename(...,r,dr,d2r)

call subroutinename(...,r,dr)
What is the effect of passing an allocatable variable into a subroutine with non-allocatable argument?

What is the effect of passing an allocatable variable into a subroutine with non-allocatable argument?


By : José Luís R. Rua
Date : March 29 2020, 07:55 AM
I hope this helps . High Performance Mark's answer says about all I wanted. I will repeat one aspect though, for emphasis.
It is very much required that the allocatable array in the subroutine be allocated when the subroutine is called. [And in the case of the question, of sufficient size.]
Unlimited polymorphic dummy argument with allocatable or pointer attributes?

Unlimited polymorphic dummy argument with allocatable or pointer attributes?


By : Yoann
Date : March 29 2020, 07:55 AM
I wish this help you The error message is just a restatement of a restriction in the rules of the language - see 15.5.2.5p2 in the Fortran 2018 standard. The restriction is there to stop the called procedure from reallocating an allocatable dummy argument to a different type or kind from the actual argument (or, for pointer dummy arguments, associating the the dummy to a different type or kind). This is not specific to unlimited polymorphic arguments - it applies to any allocatable or pointer polymorphic dummy argument, in which case the restriction in the language prevents the procedure from allocating the dummy argument to a different branch of the type inheritance tree.
Unlimited polymorphic objects have a role to play in runtime type agnostic storage, but they are not suitable for generic programming in the general case.
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