56 lines
2.9 KiB
Ada
56 lines
2.9 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . R A N D O M _ S E E D --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2011-2012, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Version used on all systems except Ravenscar where Calendar is unavailable
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with Ada.Calendar; use Ada.Calendar;
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with Ada.Unchecked_Conversion;
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package body System.Random_Seed is
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Y2K : constant Time :=
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Time_Of (Year => 2000, Month => 1, Day => 1, Seconds => 0.0);
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-- First day of Year 2000, to get a duration
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function To_U64 is
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new Ada.Unchecked_Conversion (Duration, Interfaces.Unsigned_64);
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--------------
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-- Get_Seed --
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--------------
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function Get_Seed return Interfaces.Unsigned_64 is
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begin
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return To_U64 (Clock - Y2K);
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end Get_Seed;
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end System.Random_Seed;
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