是否可以在Fortran 2003中模拟抽象/延迟和常规过程?

问题描述

当我尝试将常规过程和递延过程混合在一种抽象类型中时，gfortran会在常规过程的任何调用时都失败:错误:在(1)处进行类型绑定过程调用的基础对象的类型为'tbody'，为ABSTRACT类型."

When I try to mix both regular procedures and deferred procedures in one abstract type, gfortran balks at any invocation of the regular procedures:" Error: Base object for type-bound procedure call at (1) is of ABSTRACT type 'tbody' "

    type, abstract  :: tBody
private
  ...
contains
  procedure                     :: init => new_Body
  ...
  procedure (contained), deferred   :: PointIn
end type tBody
abstract interface
  logical(LGT) pure function contained( Body, Point )
    import  :: tBody, tAffinePoint, LGT
    class(tBody), intent(IN)        :: Body
    type(tAffinePoint), intent(IN)  :: Point
  end function contained
end interface

subroutine newCuboid(  this, ... )
class(tCuboid), intent(OUT)     :: this
...

call this%tBody%init( ... )
....    [gfortran halts here]

end subroutine newCuboid

是否可以安排类型tBody以便我可以同时拥有抽象的延迟过程和常规的实例化过程?

Is there a way to arrange the type tBody so that I can have both abstract, deferred procedures and regular, instantiated procedures?

推荐答案

否.

有一个简单的解决方案-将 call this％tBody％init(...)替换为 call new_Body(...)(您可能需要进行适当的可访问性更改).

There's a simple solution - replace call this%tBody%init(...) with call new_Body(...) (you may need to make appropriate accessibility changes).

合理化可能微不足道-您不是基于引用的类型来解析过程(因为它是硬编码的)，因此请不要使用类型绑定过程的语法.

Possibly feeble rationalisation - you are not resolving the procedure on the basis of the type of the reference (because that's hard coded), so don't use type bound procedure syntax.

在某些情况下，另一种解决方案是进一步拆分类型层次结构，以使抽象类型tBody具有非抽象父级，该父级承载未延迟"过程的初始实现.

Another solution in some cases is to split the type hierarchy further, so that the abstract type tBody has a non-abstract parent that hosts the initial implementation of the "not deferred" procedures.

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