Out ...: Array of Something

[BubikolRamios]

while setting length

Code: Pascal  [Select][+][-]

1. Out intersectionP : Tpoint

would work

Code: Pascal  [Select][+][-]

1. function .....(....; Out intersectionsPoints : Array of TPoint):boolean;
2. //....
3. Setlength(intersectionsPoints, Length(intersectionsPoints)+1);
4.  

not initialized, type mismatch  ?

instead of length

Code: Pascal  [Select][+][-]

1. high(intersectionsPoints)-low(intersectionsPoints)+1;

does not make any difference

[PascalDragon]

I don't understand what you mean. Please show a full example and not just fragments.

[Martin_fr]

intersectionsPoints  is an "open array" (not a dynamic array).

You can not set the length of an open array. 

Though I am not exactly sure how that works for an "out param". I would assume the out only applies to the content (the TPoints in the array). But not sure.

Declare a dynamic array

Code: Pascal  [Select][+][-]

1. type TPointArray = array of TPoint;
2. function foo(out points: TPointArray): boolean;
3. begin
4.   SetLength(points, 42);

[440bx]

while setting length

Code: Pascal  [Select][+][-]

1. Out intersectionP : Tpoint

would work

In addition to what @Martin_fr mentioned, in "intersectionP : Tpoint", that's not an array therefore there is no "high" nor "low" there.  You say SetLength would work but, I have doubts about that, it makes no sense to SetLength something that is not an array.  (didn't even test that because it doesn't make sense.)