74 lines
3.6 KiB
Ada
74 lines
3.6 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . N U M E R I C S . D I S C R E T E _ R A N D O M --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2015, Free Software Foundation, Inc. --
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-- --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT. The copyright notice above, and the license provisions that follow --
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-- apply solely to the contents of the part following the private keyword. --
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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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-- Note: the implementation used in this package is a version of the
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-- Mersenne Twister. See s-rannum.adb for details and references.
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with System.Random_Numbers;
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generic
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type Result_Subtype is (<>);
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package Ada.Numerics.Discrete_Random is
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-- Basic facilities
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type Generator is limited private;
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function Random (Gen : Generator) return Result_Subtype;
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procedure Reset (Gen : Generator; Initiator : Integer);
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procedure Reset (Gen : Generator);
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-- Advanced facilities
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type State is private;
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procedure Save (Gen : Generator; To_State : out State);
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procedure Reset (Gen : Generator; From_State : State);
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Max_Image_Width : constant := System.Random_Numbers.Max_Image_Width;
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function Image (Of_State : State) return String;
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function Value (Coded_State : String) return State;
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private
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type Generator is new System.Random_Numbers.Generator;
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type State is new System.Random_Numbers.State;
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end Ada.Numerics.Discrete_Random;
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