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-- G N A T C O L L --
-- --
-- Copyright (C) 2008-2014, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
package GNATCOLL.Tribooleans is
type Triboolean is (True, False, Indeterminate);
-- This type is an extension to the basic boolean type.
-- It provides a 3-state boolean logic, where the first two states are
-- equivalent to the standard Boolean values.
-- You can easily provide a renaming for the Indeterminate state by
-- declaring a constant:
-- Maybe : constant Triboolean := Indeterminate;
function To_TriBoolean (Value : Boolean) return Triboolean;
-- Convert a boolean into a TriBoolean
function To_Boolean (Value : Triboolean) return Boolean;
-- Convert to a boolean, with the following rules:
-- if Value is True, the resulting boolean is true, otherwise the result
-- is false.
function "not" (Value : Triboolean) return Triboolean;
-- Returns the negative of a triboolean:
-- True => False
-- False => True,
-- Indeterminate => Indeterminate
function "and" (Value1, Value2 : Triboolean) return Triboolean;
function "and" (Value1 : Triboolean; Value2 : Boolean) return Triboolean;
function "and" (Value1 : Boolean; Value2 : Triboolean) return Triboolean;
-- Logical "and" between two tribooleans, with the following truth table:
-- T | F | I
-- ----------
-- T | T | F | I
-- F | F | F | F
-- I | I | F | I
function "or" (Value1, Value2 : Triboolean) return Triboolean;
function "or" (Value1 : Triboolean; Value2 : Boolean) return Triboolean;
function "or" (Value1 : Boolean; Value2 : Triboolean) return Triboolean;
-- Logical "or" between two tribooleans, with the following truth table:
-- T | F | I
-- ----------
-- T | T | T | T
-- F | T | F | I
-- I | T | I | I
function "xor" (Value1, Value2 : Triboolean) return Triboolean;
function "xor" (Value1 : Triboolean; Value2 : Boolean) return Triboolean;
function "xor" (Value1 : Boolean; Value2 : Triboolean) return Triboolean;
-- Logical "xor" between two tribooleans, with the following truth table:
-- T | F | I
-- ----------
-- T | F | T | I
-- F | T | F | I
-- I | I | I | I
function "=" (Value1 : Boolean; Value2 : Triboolean) return Boolean;
function "=" (Value1 : Triboolean; Value2 : Boolean) return Boolean;
-- Compare a triboolean and a boolean. If the triboolean is Indeterminate,
-- the result is always False.
function Equal (Value1 : Triboolean; Value2 : Boolean) return Triboolean;
function Equal (Value1 : Boolean; Value2 : Triboolean) return Triboolean;
function Equal (Value1 : Triboolean; Value2 : Triboolean) return Triboolean;
-- Compare two tribooleans, with the following truth table:
-- T | F | I
-- ----------
-- T | T | F | I
-- F | F | T | I
-- I | I | I | I
-- Note that comparing two indeterminate values also returns indeterminate,
-- as opposed to what "=" would return!
function Image (Value : Triboolean) return String;
function Value (Str : String) return Triboolean;
-- Convert to and from a string. Any value that does not match the value
-- that would be returned by Boolean'Image or Boolean'Value is declared as
-- indeterminate.
pragma Inline (To_TriBoolean);
pragma Inline (To_Boolean);
pragma Inline ("and");
pragma Inline ("or");
pragma Inline ("xor");
pragma Inline ("=");
pragma Inline (Equal);
end GNATCOLL.Tribooleans;
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