> No code shown either. And no reason deployed, why we couldn't
> code this without trampolines in the old threads.
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Integer_Text_IO; use Ada.Integer_Text_IO;
with GNAT.Heap_Sort_A;
procedure Show_Trampolines is
Numbers : array (0 .. 16) of Natural;
procedure Move (From : Natural; To : Natural) is
begin
Numbers (To) := Numbers (From);
end Move;
function Lt (Op1, Op2 : Natural) return Boolean is
begin
return Numbers (Op1) < Numbers (Op2);
end Lt;
begin
Numbers (1 .. 16) := (10, 2, 3, 14, 12, 9, 15, 6,
16, 11, 1, 5, 14, 4, 8, 7);
GNAT.Heap_Sort_A.Sort (N => 16,
Move => Move'Unrestricted_Access,
Lt => Lt'Unrestricted_Access);
for J in Numbers'First + 1 .. Numbers'Last loop
Put (Numbers (J), 0);
New_Line;
end loop;
end Show_Trampolines;
Although the Unrestricted_Access attribute is a GNAT extension, you
get the idea, I think. (In fact, Unrestricted_Access is expected
to give you a standard subprogram access value, and I don't think
there other ways to achieve that, at least they aren't as efficient as
trampolines.)
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