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[Imported from Perforce change 10463 at 2006-12-01 22:56:10] Subversion-branch: /trunk/polyorb Subversion-revision: 37922
83 lines
3.9 KiB
Ada
83 lines
3.9 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- POLYORB COMPONENTS --
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-- --
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-- S T R I N G _ S E T S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2006, Free Software Foundation, Inc. --
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-- --
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-- PolyORB is free software; you can redistribute it and/or modify it --
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-- under terms of the GNU General Public License as published by the Free --
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-- Software Foundation; either version 2, or (at your option) any later --
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-- version. PolyORB is distributed in the hope that it will be useful, --
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
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-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public --
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-- License for more details. You should have received a copy of the GNU --
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-- General Public License distributed with PolyORB; see file COPYING. If --
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-- not, write to the Free Software Foundation, 51 Franklin Street, Fifth --
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-- Floor, Boston, MA 02111-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- PolyORB is maintained by AdaCore --
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-- (email: sales@adacore.com) --
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-- --
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------------------------------------------------------------------------------
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-- Simple sets of Strings. Note that storage is never reclaimed; objects of
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-- type Set are typically global.
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with GNAT.Dynamic_HTables;
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package String_Sets is
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type Set is limited private;
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function Contains (Container : Set; Element : String) return Boolean;
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-- Determine whether Element is in Container
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procedure Insert (Container : in out Set; Element : String);
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-- Insert Element into Container
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private
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-- WAG:5.03a1 : Ideally, this would be implemented in terms of
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-- Ada.Containers.Indefinite_Hashed_Sets, but we wish to avoid
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-- dependence on Ada 2005 features, so this can be compiled with
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-- older compilers.
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-- The implementation is a hash table mapping strings to True; False means
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-- "not present". This implementation is probably not as efficient as the
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-- Indefinite_Hashed_Sets would be.
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type Header_Num is range 0 .. 2**14 - 1;
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-- arbitrary number; seems big enough
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type String_Ptr is access constant String;
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-- We have to use a pointer, because Simple_HTable requires a definite
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-- subtype.
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function Hash (F : String_Ptr) return Header_Num;
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function Equal (F1, F2 : String_Ptr) return Boolean;
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package Tables is new GNAT.Dynamic_HTables.Simple_HTable
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(Header_Num => Header_Num,
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Element => Boolean,
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No_Element => False,
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Key => String_Ptr,
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Hash => Hash,
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Equal => Equal);
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type Set is limited record
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Set : Tables.Instance;
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end record;
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end String_Sets;
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