[Lazarus] two questions about generics

[Xiangrong Fang]

Hi all,

I have two questions about generics.  I am writing a two-dimensional table
class. Say:

type
  generic TTable<TValue> = class
  ... ...
  public
    constructor Create(ADefaultValue: TValue);
  end;

My questions are:

1) if I am not writing a generic class I can define default value for the
constructor, i.e.

constructor Create(ADefaultValue: Double = 0);

for generic classes, how can I define a default value?

2) if I cannot define a default value, I hope to do so while specializing
it. i.e.

type
  TNumericTable = specialize TTable<Double>
  public
    constructor Create(ADefaultValue: Double = 0); override;
  end;

That is, can I "inherit" a generic class while specializing it?

Thanks,
Shannon
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