Hi *,

I have generics record, where one method computes distance between 2 points:

function T2DPoint.Distance(P: T2DPoint): Single;

begin

Result := Sqrt(Sqr(x-P.x) + Sqr(y-P.y));

end;

But this does not compile as there are many versions of Sqr() in the

scope Sqr(longint), Sqr(QWord), Sqr(Extended), Sqr(int64)

Point coordinates (x,y) can be either integer or single (in my case)

when specializing, so decision which version of Sqr() to call should be

postponed to specializing phase, does not?

Is there other solution as:

function T2DPoint.Distance(P: T2DPoint): Single;

var dx,dy: T;

begin

dx := x-P.x;

dy := y-P.y;

Result := Sqrt(dx*dx + dy*dy);

end;

(for integer operations Sqr() is implemented as "value*value", so there

is no difference (compared to above mentioned implementation) but for

floating point operations there is called internal function

"fpc_in_sqr_real" which is IMO implemented in smarter way that

"value*value" (I can not find where/how is implemented)?)

TIA

-Laco.

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