* Ada 2005 problem using Iterate
@ 2016-10-05 7:28 Roger
2016-10-05 8:15 ` Alejandro R. Mosteo
0 siblings, 1 reply; 4+ messages in thread
From: Roger @ 2016-10-05 7:28 UTC (permalink / raw)
I've successfully used Iterate quite often before but the attached code won't work and I can't figure out why.
Presumably something obvious that I'm blind to!
No matter what I try, compiling numbers.adb produces the error messages:
numbers.adb:24:48: expected access to subprogram "Ada.Containers.Vectors." from instance at numbers.ads:17
numbers.adb:24:48: found type access to procedure "Show_Two_Numbers" defined at line 24
numbers.ads:17 is:
package pNumbers_Vector is new Ada.Containers.Vectors (tNumbers_Index, tNumbers);
numbers.adb:24 is:
Numbers_Vector.Iterate(Show_Two_Numbers'Access);
Can someone tell me what I'm doing wrong?
Regards,
Roger
Numbers.ads:
with Ada.Containers.Vectors;
package Numbers is
type tNumbers_Vector is private;
procedure Print_Numbers_Data (Numbers_Vector : tNumbers_Vector);
private
type tNumbers is record
n1 : Integer := 0;
n2 : Integer := 0;
end record;
subtype tNumbers_Index is Natural;
package pNumbers_Vector is new Ada.Containers.Vectors (tNumbers_Index, tNumbers);
type tNumbers_Vector is new pNumbers_Vector.Vector with null record;
end Numbers;
============================================================
Numbers.adb:
with Ada.Text_IO; use Ada.Text_IO;
package body Numbers is
Numbers_List : tNumbers_Vector;
function New_Record(n1 : Integer; n2 : Integer) return tnumbers is
theRecord : tnumbers := (n1, n2);
begin
return theRecord;
end New_Record;
-- ----------------------------------------------------------------------------------------------------
procedure Print_Numbers_Data (Numbers_Vector : tNumbers_Vector) is
procedure Show_Two_Numbers(Number_Index : tNumbers_Index) is
aNumber_Record : tnumbers;
begin
aNumber_Record := Numbers_Vector.Element(Number_Index);
Put("Number 1: " & Integer'image(aNumber_Record.n1));
Put_Line(" Number 2: " & Integer'image(aNumber_Record.n2));
end Show_Two_Numbers;
begin
Numbers_Vector.Iterate(Show_Two_Numbers'Access);
end Print_Numbers_Data;
-- ----------------------------------------------------------------------------------------------------
begin
for index in Natural range 0..3 loop
Numbers_List.Append(New_Record(index + 2, 2* index + 1));
end loop;
end Numbers;
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: Ada 2005 problem using Iterate
2016-10-05 7:28 Ada 2005 problem using Iterate Roger
@ 2016-10-05 8:15 ` Alejandro R. Mosteo
2016-10-05 23:27 ` Roger
0 siblings, 1 reply; 4+ messages in thread
From: Alejandro R. Mosteo @ 2016-10-05 8:15 UTC (permalink / raw)
On 05/10/16 09:28, Roger wrote:
> I've successfully used Iterate quite often before but the attached code won't work and I can't figure out why.
> Presumably something obvious that I'm blind to!
What I see from checking the a-convec.ads spec
procedure Iterate
(Container : Vector;
Process : not null access procedure (Position : Cursor));
is that your Show_Two_Numbers should expect a Cursor and not and index.
I don't see any other iterate with a compatible profile.
HTH,
Alex.
> No matter what I try, compiling numbers.adb produces the error messages:
>
> numbers.adb:24:48: expected access to subprogram "Ada.Containers.Vectors." from instance at numbers.ads:17
> numbers.adb:24:48: found type access to procedure "Show_Two_Numbers" defined at line 24
>
> numbers.ads:17 is:
> package pNumbers_Vector is new Ada.Containers.Vectors (tNumbers_Index, tNumbers);
> numbers.adb:24 is:
> Numbers_Vector.Iterate(Show_Two_Numbers'Access);
>
> Can someone tell me what I'm doing wrong?
> Regards,
> Roger
>
> Numbers.ads:
> with Ada.Containers.Vectors;
> package Numbers is
> type tNumbers_Vector is private;
> procedure Print_Numbers_Data (Numbers_Vector : tNumbers_Vector);
> private
> type tNumbers is record
> n1 : Integer := 0;
> n2 : Integer := 0;
> end record;
>
> subtype tNumbers_Index is Natural;
> package pNumbers_Vector is new Ada.Containers.Vectors (tNumbers_Index, tNumbers);
> type tNumbers_Vector is new pNumbers_Vector.Vector with null record;
> end Numbers;
>
> ============================================================
>
> Numbers.adb:
> with Ada.Text_IO; use Ada.Text_IO;
>
> package body Numbers is
> Numbers_List : tNumbers_Vector;
> function New_Record(n1 : Integer; n2 : Integer) return tnumbers is
> theRecord : tnumbers := (n1, n2);
> begin
> return theRecord;
> end New_Record;
>
> -- ----------------------------------------------------------------------------------------------------
>
> procedure Print_Numbers_Data (Numbers_Vector : tNumbers_Vector) is
>
> procedure Show_Two_Numbers(Number_Index : tNumbers_Index) is
> aNumber_Record : tnumbers;
> begin
> aNumber_Record := Numbers_Vector.Element(Number_Index);
> Put("Number 1: " & Integer'image(aNumber_Record.n1));
> Put_Line(" Number 2: " & Integer'image(aNumber_Record.n2));
> end Show_Two_Numbers;
>
> begin
> Numbers_Vector.Iterate(Show_Two_Numbers'Access);
> end Print_Numbers_Data;
>
> -- ----------------------------------------------------------------------------------------------------
>
> begin
> for index in Natural range 0..3 loop
> Numbers_List.Append(New_Record(index + 2, 2* index + 1));
> end loop;
> end Numbers;
>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: Ada 2005 problem using Iterate
2016-10-05 8:15 ` Alejandro R. Mosteo
@ 2016-10-05 23:27 ` Roger
2016-10-06 7:24 ` Alejandro R. Mosteo
0 siblings, 1 reply; 4+ messages in thread
From: Roger @ 2016-10-05 23:27 UTC (permalink / raw)
Thanks Alex,
As expected, a simple reason!
Code that works:
with Ada.Text_IO; use Ada.Text_IO;
package body Numbers is
Numbers_List : tNumbers_Vector;
function New_Record(n1 : Integer; n2 : Integer) return tnumbers is
theRecord : tnumbers := (n1, n2);
begin
return theRecord;
end New_Record;
-- ----------------------------------------------------------------------------------------------------
procedure Print_Numbers_Data (Numbers_Vector : tNumbers_Vector) is
procedure Show_Two_Numbers(Number_Cursor : pNumbers_Vector.Cursor) is
aNumber_Record : tnumbers;
begin
aNumber_Record := Numbers_Vector.Element(pNumbers_Vector.To_Index(Number_Cursor));
Put("Number 1: " & Integer'image(aNumber_Record.n1));
Put_Line(" Number 2: " & Integer'image(aNumber_Record.n2));
end Show_Two_Numbers;
begin
Numbers_Vector.Iterate(Show_Two_Numbers'Access);
end Print_Numbers_Data;
-- ----------------------------------------------------------------------------------------------------
procedure Load_Numbers(Numbers_Vector : in out tNumbers_Vector) is
begin
for index in Natural range 0..3 loop
Numbers_Vector.Append(New_Record(index + 2, 2* index + 1));
end loop;
end Load_Numbers;
end Numbers;
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: Ada 2005 problem using Iterate
2016-10-05 23:27 ` Roger
@ 2016-10-06 7:24 ` Alejandro R. Mosteo
0 siblings, 0 replies; 4+ messages in thread
From: Alejandro R. Mosteo @ 2016-10-06 7:24 UTC (permalink / raw)
On 06/10/16 01:27, Roger wrote:
> Thanks Alex,
> As expected, a simple reason!
Tunnel vision happens ;)
Can't you use Element directly on the cursor?
Alex.
>
> Code that works:
>
> with Ada.Text_IO; use Ada.Text_IO;
>
> package body Numbers is
> Numbers_List : tNumbers_Vector;
> function New_Record(n1 : Integer; n2 : Integer) return tnumbers is
> theRecord : tnumbers := (n1, n2);
> begin
> return theRecord;
> end New_Record;
>
> -- ----------------------------------------------------------------------------------------------------
>
> procedure Print_Numbers_Data (Numbers_Vector : tNumbers_Vector) is
>
> procedure Show_Two_Numbers(Number_Cursor : pNumbers_Vector.Cursor) is
> aNumber_Record : tnumbers;
> begin
> aNumber_Record := Numbers_Vector.Element(pNumbers_Vector.To_Index(Number_Cursor));
> Put("Number 1: " & Integer'image(aNumber_Record.n1));
> Put_Line(" Number 2: " & Integer'image(aNumber_Record.n2));
> end Show_Two_Numbers;
>
> begin
> Numbers_Vector.Iterate(Show_Two_Numbers'Access);
> end Print_Numbers_Data;
>
> -- ----------------------------------------------------------------------------------------------------
>
> procedure Load_Numbers(Numbers_Vector : in out tNumbers_Vector) is
> begin
> for index in Natural range 0..3 loop
> Numbers_Vector.Append(New_Record(index + 2, 2* index + 1));
> end loop;
> end Load_Numbers;
>
> end Numbers;
>
^ permalink raw reply [flat|nested] 4+ messages in thread
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2016-10-05 7:28 Ada 2005 problem using Iterate Roger
2016-10-05 8:15 ` Alejandro R. Mosteo
2016-10-05 23:27 ` Roger
2016-10-06 7:24 ` Alejandro R. Mosteo
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