From: Christos Chryssochoidis <C.Chryssochoidis@gmail.com>
Subject: Re: Newbie's question
Date: Wed, 13 Feb 2008 13:06:04 +0200
Date: 2008-02-13T13:06:04+02:00 [thread overview]
Message-ID: <1202900672.56552@athprx03> (raw)
In-Reply-To: <1202856976.51300@athprx04>
From a reply I received in private, it seems that the "generic" version
of that code of mine is of interest for some, so I post it, making no
claim that it is well written…
with Ada.Containers.Vectors;
with Ada.Text_IO;
procedure Test_Filter is
subtype Index is Natural;
type Int_Array is array(Index range<>) of Integer;
generic
with function Predicate(Element : Integer) return Boolean;
function Filter(Elements : Int_Array) return Int_Array;
function Filter(Elements : Int_Array) return Int_Array is
package Int_Vectors is new Ada.Containers.Vectors(Element_Type =>
Integer, Index_Type => Index);
Tmp_Vector : Int_Vectors.Vector;
begin
for I in Elements'Range loop
if Predicate(Elements(I)) then
Tmp_Vector.Append(Elements(I));
end if;
end loop;
Copy_Vector:
declare
Result : Int_Array(0..Index(Tmp_Vector.Length)-1);
I : Integer := 0;
procedure Copy(Position: Int_Vectors.Cursor) is
begin
Result(I) := Int_Vectors.Element(Position);
I := I + 1;
end Copy;
begin
Tmp_Vector.Iterate(Copy'Access);
return Result;
end Copy_Vector;
end Filter;
function Greater_Equal_3(Element :Integer) return Boolean is
begin
return Element <= 3;
end Greater_Equal_3;
Int_Array1 : Int_Array := (1,2,3,4,5);
Int_Array2 : Int_Array(1..3);
function My_Filter is new Filter(Predicate=>Greater_Equal_3);
begin
Int_Array2 := My_Filter(Int_Array1);
for I in Int_Array1'Range loop
Ada.Text_IO.Put_Line(Int_Array1(I)'Img);
end loop;
Ada.Text_IO.Put_Line("");
for I in Int_Array2'Range loop
Ada.Text_IO.Put_Line(Int_Array2(I)'Img);
end loop;
end Test_Filter;
prev parent reply other threads:[~2008-02-13 11:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-11 14:31 Newbie's question Christos Chryssochoidis
2008-02-11 16:28 ` Newbie's question [SOLVED] Christos Chryssochoidis
2008-02-11 17:42 ` Newbie's question Jeffrey R. Carter
2008-02-12 22:56 ` Christos Chryssochoidis
2008-02-13 11:06 ` Christos Chryssochoidis [this message]
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox