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From: "Dennis W. Butler" <dbutler@calpoly.edu>
Subject: access function in strings.maps
Date: 1997/04/25
Message-ID: <336154D9.4E0A@calpoly.edu>#1/1
X-Deja-AN: 237406409
Organization: Cal Poly, San Luis Obispo
Newsgroups: comp.lang.ada
Date: 1997-04-25T00:00:00+00:00
List-Id: <comp.lang.ada>



I've been exploring the string handling capabilities of Ada95 and have
stumbled across a Thing I can't figure out. In the strings.maps package
(LRM section A.4.2), there is a type definition that reads:

type Character_Mapping_Function is access function (From : in character)
return character;

I would have thought a Character_Mapping_Function would be more like:

function Character_Mapping_Function (The_Map: in Character_Mapping;
Domain_Character: in Character) return Character; -- range character

Although I read LRM section 3.10, I couldn't figure out the access
function type definition. Where can I get an explanation of what the
type definition does and how I can use it? I did note that the LRM says
that the Character_mapping_Function is used for transformational
mappings in the Translate subprograms...does this mean I'm not supposed
to worry about it?

Thanks,

Dennis Butler
Computer Science Department
Cal Poly, San Luis Obispo