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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . N U M E R I C S . F L O A T _ R A N D O M --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the contents of the part following the private keyword. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- GNAT was originally developed by the GNAT team at New York University. --
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32 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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33 -- --
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34 ------------------------------------------------------------------------------
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35
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36 -- Note: the implementation used in this package is a version of the
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37 -- Mersenne Twister. See s-rannum.adb for details and references.
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38
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39 with System.Random_Numbers;
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40
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41 package Ada.Numerics.Float_Random with
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42 SPARK_Mode => Off
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43 is
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44
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45 -- Basic facilities
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46
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47 type Generator is limited private;
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48
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49 subtype Uniformly_Distributed is Float range 0.0 .. 1.0;
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50
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51 function Random (Gen : Generator) return Uniformly_Distributed;
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52
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53 procedure Reset (Gen : Generator);
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54 procedure Reset (Gen : Generator; Initiator : Integer);
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55
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56 -- Advanced facilities
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57
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58 type State is private;
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59
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60 procedure Save (Gen : Generator; To_State : out State);
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61 procedure Reset (Gen : Generator; From_State : State);
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62
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63 Max_Image_Width : constant := System.Random_Numbers.Max_Image_Width;
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64
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65 function Image (Of_State : State) return String;
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66 function Value (Coded_State : String) return State;
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67
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68 private
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69
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70 type Generator is new System.Random_Numbers.Generator;
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71
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72 type State is new System.Random_Numbers.State;
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73
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74 end Ada.Numerics.Float_Random;
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