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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;
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