Node:PtrDiffType, Next:PtrInt, Previous:PtrCard, Up:Reference
(Under construction.)
type
PtrDiffType { built-in type }
PtrDiffType is a (signed) integer type to represent the
difference between two positions in memory. It is not needed except
for rather low-level purposes.
PtrDiffType is a GNU Pascal extension.
program PtrDiffTypeDemo;
var
a: array [1 .. 10] of Integer;
d: PtrDiffType;
p, q: ^Integer;
begin
p := @a[1];
q := @a[4];
{$X+}
d := q - p
end.