Created
February 16, 2016 20:49
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practice returning a dynamically allocated array
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with Ada.Text_IO; use Ada.Text_IO; | |
with Ada.Command_Line; | |
with Ada.Unchecked_Deallocation; | |
package body Dynamic_Allocation_Experiment | |
is | |
type Side is (Left, Right); | |
type Side_Array is array (Integer range <>) of Side; | |
type Side_Array_Ptr is access Side_Array; | |
procedure Free_Side_Array is | |
new Ada.Unchecked_Deallocation(Side_Array, Side_Array_Ptr); | |
function Make_Sides (Size : Natural) return Side_Array_Ptr | |
is | |
begin | |
declare | |
Sides_Ptr : Side_Array_Ptr := new Side_Array (1 .. Size); | |
Toggle : Boolean := True; | |
begin | |
for I in Sides_Ptr'Range loop | |
Sides_Ptr (I) := (if Toggle then Right else Left); | |
Toggle := not Toggle; | |
end loop; | |
return Sides_Ptr; | |
end; | |
end Make_Sides; | |
procedure Dump_Sides (S : Side_Array_Ptr) is | |
begin | |
for I in S'Range loop | |
Ada.Text_IO.Put_Line (Side'Image (S (I))); | |
end loop; | |
end Dump_Sides; | |
procedure Dynamic_Allocation_Experiment | |
is | |
S : Side_Array_Ptr; | |
Arg1 : String := Ada.Command_Line.Argument (1); | |
Size : Integer := Integer'Value (Arg1); | |
begin | |
S := Make_Sides (Size); | |
Dump_Sides (S); | |
Ada.Text_IO.Put_Line ("len: " & Integer'Image (S'Length)); | |
Free_Side_Array (S); | |
end Dynamic_Allocation_Experiment; | |
end Dynamic_Allocation_Experiment; |
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