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Newsgroups: comp.lang.ada
Date: Fri, 1 Nov 2019 11:47:28 -0700 (PDT)
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Subject: Re: gtkada3 callback function & failure : subprogram must not be
 deeper than access type
From: Shark8 <onewingedshark@gmail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:57429
Date: 2019-11-01T11:47:28-07:00
List-Id: <comp.lang.ada>

Move the On_Button_Click procedure to its own file (on-button-click.ads or =
something) and add "With On_Button_Click;" to your hello_gtk procedure.

The reason for the error "subprogram must not be deeper than access type" i=
s because the subprogram's access-level is inside the scope of hello_gtk, b=
ut the parameter's access-type exceeds that scope: IOW, the access failure =
is to prevent the dangling-pointer situation where hello_gtk finishes and t=
herefore leaves the scope (thus invalidating the reference to On_Button_Cli=
ck).