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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- --
+-- S Y S T E M . V E C T O R S . B O O L E A N _ O P E R A T I O N S --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2002-2009, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- 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/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package contains functions for runtime operations on boolean vectors
+
+package System.Vectors.Boolean_Operations is
+ pragma Pure;
+
+ -- Although in general the boolean operations on arrays of booleans are
+ -- identical to operations on arrays of unsigned words of the same size,
+ -- for the "not" operator this is not the case as False is typically
+ -- represented by 0 and true by 1.
+
+ function "not" (Item : Vectors.Vector) return Vectors.Vector;
+
+ -- The three boolean operations "nand", "nor" and "nxor" are needed
+ -- for cases where the compiler moves boolean array operations into
+ -- the body of the loop that iterates over the array elements.
+
+ -- Note the following equivalences:
+ -- (not X) or (not Y) = not (X and Y) = Nand (X, Y)
+ -- (not X) and (not Y) = not (X or Y) = Nor (X, Y)
+ -- (not X) xor (not Y) = X xor Y
+ -- X xor (not Y) = not (X xor Y) = Nxor (X, Y)
+
+ function Nand (Left, Right : Boolean) return Boolean;
+ function Nor (Left, Right : Boolean) return Boolean;
+ function Nxor (Left, Right : Boolean) return Boolean;
+
+ function Nand (Left, Right : Vectors.Vector) return Vectors.Vector;
+ function Nor (Left, Right : Vectors.Vector) return Vectors.Vector;
+ function Nxor (Left, Right : Vectors.Vector) return Vectors.Vector;
+
+ pragma Inline_Always ("not");
+ pragma Inline_Always (Nand);
+ pragma Inline_Always (Nor);
+ pragma Inline_Always (Nxor);
+end System.Vectors.Boolean_Operations;