German C. Basisty wrote:
Now I tryed writting both uses on implementation section and also works
well. Whats the diference between uses clause and implementation clause?
both are uses clauses.
The one defined in the interface section tells the compiler which units
to use to compile the interface part of a unit (and also the
implementation part since the scope is from top to bottom in a unit)
The one defined in the implementation section tells the compiler which
units to use to compile the implementation section.
So for code you can resolve circular references this way. For
definitions in the interface part not.
Compiling the following excmple doesn't work (in such cases redesign
your class and or unit layout):
unit A;
interface
uses
B;
type
TA = class
end;
TAB = class(TB)
end;
....
unit B;
interface
uses
A;
type
TB = class
end;
TBA = class(TA)
end;
....
Marc
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