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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . E X P O N T --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2025, 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 provides functions for signed integer exponentiation. This
-- is the version of the package with checks enabled.
generic
type Int is range <>;
package System.Expont
with Pure, SPARK_Mode
is
function Expon (Left : Int; Right : Natural) return Int;
-- Calculate ``Left`` ** ``Right``. If ``Left`` is 0 then 0 is returned
-- and if ``Right`` is 0 then 1 is returned. In all other cases the result
-- is set to 1 and then computed in a loop as follows:
-- If ``Right`` is a multiple of 2 then multiply the result with ``Left``.
-- Divide ``Right`` by 2.
-- If ``Right is 0, return.
-- Multiply ``Left`` with itself.
end System.Expont;
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