[fpc-pascal] Re: Complex circular references

leledumbo leledumbo_cool at yahoo.co.id
Fri Nov 23 07:28:23 CET 2012

> I still dont understand why FPC doesnt support circular references... 

There is no way to solve that ? 

Do you think Delphi or Turbo Pascal or even UCSD Pascal ever supports? The
concept of units and uses clause makes the order in which units must be
initialized (and how identifier is searched) is important, which is derived
from how it's written in the uses clause, in a cascaded fashion. Thus, a
uses clause serves as a depth first search path for the compiler to
determine unit initialization order. If A uses B and B uses A, directly or
indirectly, which one should be initialized first?

The only way to solve is to correctly group things in a unit (after all,
unit serves as a placeholder for closely related things), or use 3rd unit
for data sharing or the worst, use circular reference in implementation
section. You'll notice that this is a common problem in a language with
similar concept (and each have its own workaround).

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