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-- CXA5012.A

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--     PARTICULAR PURPOSE OF SAID MATERIAL.

--*

--

-- OBJECTIVE:

--      Check that, for both Float_Random and Discrete_Random packages,

--      the following are true:

--      1) the procedures Save and Reset can be used to save the

--         specific state of a random number generator, and then restore

--         the specific state to the generator following some intermediate

--         generator activity.

--      2) the Function Image can be used to obtain a string

--         representation of the state of a generator; and that the

--         Function Value will transform a string representation of the

--         state of a random number generator into the actual state object.

--      3) a call to Function Value, with a string value that is

--         not the image of any generator state, is a bounded error. This

--         error either raises Constraint_Error or Program_Error, or is

--         accepted. (See Technical Corrigendum 1).

--

-- TEST DESCRIPTION:

--      This test evaluates components of the Ada.Numerics.Float_Random and

--      Ada.Numerics.Discrete_Random packages.

--      The first objective block of this test uses Procedure Save to

--      save the particular state of a random number generator.  The random

--      number generator then generates a series of random numbers.  The

--      saved state variable is then used to reset (using Procedure Reset)

--      the generator back to the state it was in at the point of the call

--      to Save.  Random values are then generated from this restored

--      generator, and compared with expected values.

--      The second objective block of this test uses Function Image to

--      provide a string representation of a state code.  This string is

--      then transformed back to a state code value, and used to reset a

--      random number generator to the saved state.  Random values are

--      likewise generated from this restored generator, and compared with

--      expected values.

--

--

-- CHANGE HISTORY:

--      25 Apr 95   SAIC    Initial prerelease version.

--      17 Jul 95   SAIC    Incorporated reviewer comments.

--      17 Dec 97   EDS     Change subtype upper limit from 100_000 to 10_000.

--      16 Sep 99   RLB     Updated objective 3 for Technical Corrigendum 1

--                          changes.

--!

with Ada.Numerics.Float_Random;

with Ada.Numerics.Discrete_Random;

with Ada.Strings.Bounded;

with ImpDef;

with Report;

procedure CXA5012 is

begin

   Report.Test ("CXA5012", "Check the effect of Procedures Save and " &

                           "Reset, and Functions Image and Value "    &

                           "from the Ada.Numerics.Discrete_Random "   &

                           "and Float_Random packages");

   Test_Block:

   declare

      use Ada.Numerics, Ada.Strings.Bounded;

      -- Declare an integer subtype and an enumeration subtype, and use them

      -- to instantiate the discrete random number generator generic package.

      subtype Discrete_Range is Integer range 1..10_000;

      type    Suit_Of_Cards  is (Ace, One, Two, Three, Four, Five, Six,

                                 Seven, Eight, Nine, Ten, Jack, Queen, King);

      package Discrete_Pack is new Discrete_Random(Discrete_Range);

      package Card_Pack     is new Discrete_Random(Suit_Of_Cards);

      -- Declaration of random number generator objects.

      DGen_1, DGen_2 : Discrete_Pack.Generator;

      EGen_1, EGen_2 : Card_Pack.Generator;

      FGen_1, FGen_2 : Float_Random.Generator;

      -- Variables declared to hold random numbers over the inclusive range

      -- of their corresponding type.

      DVal_1, DVal_2 : Discrete_Range;

      EVal_1, EVal_2 : Suit_Of_Cards;

      FVal_1, FVal_2 : Float_Random.Uniformly_Distributed;

      -- Declaration of State variables used to hold the state of the

      -- random number generators.

      DState_1, DState_2 : Discrete_Pack.State;

      EState_1, EState_2 : Card_Pack.State;

      FState_1, FState_2 : Float_Random.State;

      -- Declaration of bounded string packages instantiated with the

      -- value of Max_Image_Width constant, and bounded string variables

      -- used to hold the image of random number generator states.

      package DString_Pack is

        new Generic_Bounded_Length(Discrete_Pack.Max_Image_Width);

      package EString_Pack is

        new Generic_Bounded_Length(Card_Pack.Max_Image_Width);

      package FString_Pack is

        new Generic_Bounded_Length(Float_Random.Max_Image_Width);

      use DString_Pack, EString_Pack, FString_Pack;

      DString_1, DString_2 : DString_Pack.Bounded_String :=

                               DString_Pack.Null_Bounded_String;

      EString_1, EString_2 : EString_Pack.Bounded_String :=

                               EString_Pack.Null_Bounded_String;

      FString_1, FString_2 : FString_Pack.Bounded_String :=

                               FString_Pack.Null_Bounded_String;

      -- Test variables.

      TC_Count                  : Natural;

      TC_Discrete_Check_Failed,

      TC_Enum_Check_Failed,

      TC_Float_Check_Failed     : Boolean := False;

      TC_Seed                   : Integer;

   begin

      Objective_1:

         -- Check that the procedures Save and Reset can be used to save the

         -- specific state of a random number generator, and then restore the

         -- specific state to the generator following some intermediate

         -- generator activity.

      declare

         First_Row     : constant :=   1;

         Second_Row    : constant :=   2;

         TC_Max_Values : constant := 100;

         TC_Discrete_Array : array (First_Row..Second_Row, 1..TC_Max_Values)

                               of Discrete_Range;

         TC_Enum_Array     : array (First_Row..Second_Row, 1..TC_Max_Values)

                               of Suit_Of_Cards;

         TC_Float_Array    : array (First_Row..Second_Row, 1..TC_Max_Values)

                               of Float_Random.Uniformly_Distributed;

      begin

         -- The state of the random number generators are saved to state

         -- variables using the procedure Save.

         Discrete_Pack.Save(Gen => DGen_1, To_State => DState_1);

         Card_Pack.Save    (Gen => EGen_1, To_State => EState_1);

         Float_Random.Save (Gen => FGen_1, To_State => FState_1);

         -- Random number generators are used to fill the first half of the

         -- first row of the arrays with randomly generated values.

         for i in 1..TC_Max_Values/2 loop

            TC_Discrete_Array(First_Row, i) := Discrete_Pack.Random(DGen_1);

            TC_Enum_Array(First_Row, i)     := Card_Pack.Random(EGen_1);

            TC_Float_Array(First_Row, i)    := Float_Random.Random(FGen_1);

         end loop;

         -- The random number generators are reset to the states saved in the

         -- state variables, using the procedure Reset.

         Discrete_Pack.Reset(Gen => DGen_1, From_State => DState_1);

         Card_Pack.Reset    (Gen => EGen_1, From_State => EState_1);

         Float_Random.Reset (Gen => FGen_1, From_State => FState_1);

         -- The same random number generators are used to fill the first half

         -- of the second row of the arrays with randomly generated values.

         for i in 1..TC_Max_Values/2 loop

            TC_Discrete_Array(Second_Row, i) := Discrete_Pack.Random(DGen_1);

            TC_Enum_Array(Second_Row, i)     := Card_Pack.Random(EGen_1);

            TC_Float_Array(Second_Row, i)    := Float_Random.Random(FGen_1);

         end loop;

         -- Run the random number generators many times (not using results).

         for i in Discrete_Range'Range loop

             DVal_1 := Discrete_Pack.Random(DGen_1);

             EVal_1 := Card_Pack.Random(EGen_1);

             FVal_1 := Float_Random.Random(FGen_1);

         end loop;

         -- The states of the random number generators are saved to state

         -- variables using the procedure Save.

         Discrete_Pack.Save(Gen => DGen_1, To_State => DState_1);

         Card_Pack.Save(Gen => EGen_1, To_State => EState_1);

         Float_Random.Save (Gen => FGen_1, To_State => FState_1);

         -- The last half of the first row of the arrays are filled with

         -- values generated from the same random number generators.

         for i in (TC_Max_Values/2 + 1)..TC_Max_Values loop

            TC_Discrete_Array(First_Row, i) := Discrete_Pack.Random(DGen_1);

            TC_Enum_Array(First_Row, i)     := Card_Pack.Random(EGen_1);

            TC_Float_Array(First_Row, i)    := Float_Random.Random(FGen_1);

         end loop;

         -- The random number generators are reset to the states saved in the

         -- state variables, using the procedure Reset.

         Discrete_Pack.Reset(Gen => DGen_1, From_State => DState_1);

         Card_Pack.Reset(Gen => EGen_1, From_State => EState_1);

         Float_Random.Reset (Gen => FGen_1, From_State => FState_1);

         -- The last half of the second row of the arrays are filled with

         -- values generated from the same random number generator.

         -- These values should exactly mirror the values in the last half

         -- of the first row of the arrays that had been previously generated.

         for i in (TC_Max_Values/2 + 1)..TC_Max_Values loop

            TC_Discrete_Array(Second_Row, i) := Discrete_Pack.Random(DGen_1);

            TC_Enum_Array(Second_Row, i)     := Card_Pack.Random(EGen_1);

            TC_Float_Array(Second_Row, i)    := Float_Random.Random(FGen_1);

         end loop;

         -- Check that the values in the two rows of the arrays are identical.

         for i in 1..TC_Max_Values loop

            if TC_Discrete_Array(First_Row,i) /=

               TC_Discrete_Array(Second_Row,i)

            then

               TC_Discrete_Check_Failed := True;

               exit;

            end if;

         end loop;

         for i in 1..TC_Max_Values loop

            if TC_Enum_Array(First_Row,i) /= TC_Enum_Array(Second_Row,i) then

               TC_Enum_Check_Failed := True;

               exit;

            end if;

         end loop;

         for i in 1..TC_Max_Values loop

            if TC_Float_Array(First_Row,i) /= TC_Float_Array(Second_Row,i)

            then

               TC_Float_Check_Failed := True;

               exit;

            end if;

         end loop;

         if TC_Discrete_Check_Failed then

            Report.Failed("Discrete random values generated following use " &

                          "of procedures Save and Reset were not the same");

            TC_Discrete_Check_Failed := False;

         end if;

         if TC_Enum_Check_Failed then

            Report.Failed("Enumeration random values generated following " &

                          "use of procedures Save and Reset were not the " &

                          "same");

            TC_Enum_Check_Failed := False;

         end if;

         if TC_Float_Check_Failed then

            Report.Failed("Float random values generated following use " &

                          "of procedures Save and Reset were not the same");

            TC_Float_Check_Failed := False;

         end if;

      end Objective_1;

      Objective_2:

         -- Check that the Function Image can be used to obtain a string

         -- representation of the state of a generator.

         -- Check that the Function Value will transform a string

         -- representation of the state of a random number generator

         -- into the actual state object.

      begin

         -- Use two discrete and float random number generators to generate

         -- a series of values (so that the generators are no longer in their

         -- initial states, and they have generated the same number of

         -- random values).

         TC_Seed := Integer(Discrete_Pack.Random(DGen_1));

         Discrete_Pack.Reset(DGen_1, TC_Seed);

         Discrete_Pack.Reset(DGen_2, TC_Seed);

         Card_Pack.Reset    (EGen_1, TC_Seed);

         Card_Pack.Reset    (EGen_2, TC_Seed);

         Float_Random.Reset (FGen_1,  TC_Seed);

         Float_Random.Reset (FGen_2,  TC_Seed);

         for i in 1..1000 loop

            DVal_1 := Discrete_Pack.Random(DGen_1);

            DVal_2 := Discrete_Pack.Random(DGen_2);

            EVal_1 := Card_Pack.Random(EGen_1);

            EVal_2 := Card_Pack.Random(EGen_2);

            FVal_1 := Float_Random.Random(FGen_1);

            FVal_2 := Float_Random.Random(FGen_2);

         end loop;

         -- Use the Procedure Save to save the states of the generators

         -- to state variables.

         Discrete_Pack.Save(Gen => DGen_1, To_State => DState_1);

         Discrete_Pack.Save(DGen_2, To_State => DState_2);

         Card_Pack.Save    (Gen => EGen_1, To_State => EState_1);

         Card_Pack.Save    (EGen_2, To_State => EState_2);

         Float_Random.Save (FGen_1, To_State => FState_1);

         Float_Random.Save (FGen_2, FState_2);

         -- Use the Function Image to produce a representation of the state

         -- codes as (bounded) string objects.

         DString_1 := DString_Pack.To_Bounded_String(

                        Discrete_Pack.Image(Of_State => DState_1));

         DString_2 := DString_Pack.To_Bounded_String(

                        Discrete_Pack.Image(DState_2));

         EString_1 := EString_Pack.To_Bounded_String(

                        Card_Pack.Image(Of_State => EState_1));

         EString_2 := EString_Pack.To_Bounded_String(

                        Card_Pack.Image(EState_2));

         FString_1 := FString_Pack.To_Bounded_String(

                        Float_Random.Image(Of_State => FState_1));

         FString_2 := FString_Pack.To_Bounded_String(

                        Float_Random.Image(FState_2));

         -- Compare the bounded string objects for equality.

         if DString_1 /= DString_2 then

            Report.Failed("String values returned from Function Image " &

                          "depict different states of Discrete generators");

         end if;

         if EString_1 /= EString_2 then

            Report.Failed("String values returned from Function Image " &

                          "depict different states of Enumeration "     &

                          "generators");

         end if;

         if FString_1 /= FString_2 then

            Report.Failed("String values returned from Function Image " &

                          "depict different states of Float generators");

         end if;

         -- The string representation of a state code is transformed back

         -- to a state code variable using the Function Value.

         DState_1 := Discrete_Pack.Value(Coded_State =>

                                          DString_Pack.To_String(DString_1));

         EState_1 := Card_Pack.Value(EString_Pack.To_String(EString_1));

         FState_1 := Float_Random.Value(FString_Pack.To_String(FString_1));

         -- One of the (pair of each type of ) generators is used to generate

         -- a series of random values, getting them "out of synch" with the

         -- specific generation sequence of the other generators.

         for i in 1..100 loop

            DVal_1 := Discrete_Pack.Random(DGen_1);

            EVal_1 := Card_Pack.Random(EGen_1);

            FVal_1 := Float_Random.Random (FGen_1);

         end loop;

         -- The "out of synch" generators are reset to the previous state they

         -- had when their states were saved, and they should now have the same

         -- states as the generators that did not generate the values above.

         Discrete_Pack.Reset(Gen => DGen_1, From_State => DState_1);

         Card_Pack.Reset    (Gen => EGen_1, From_State => EState_1);

         Float_Random.Reset (Gen => FGen_1, From_State => FState_1);

         -- All generators should now be in the same state, so the

         -- random values they produce should be the same.

         for i in 1..1000 loop

            if Discrete_Pack.Random(DGen_1) /= Discrete_Pack.Random(DGen_2)

            then

               TC_Discrete_Check_Failed := True;

               exit;

            end if;

         end loop;

         for i in 1..1000 loop

            if Card_Pack.Random(EGen_1) /= Card_Pack.Random(EGen_2) then

               TC_Enum_Check_Failed := True;

               exit;

            end if;

         end loop;

         for i in 1..1000 loop

            if Float_Random.Random(FGen_1) /= Float_Random.Random(FGen_2)

            then

               TC_Float_Check_Failed := True;

               exit;

            end if;

         end loop;

         if TC_Discrete_Check_Failed then

            Report.Failed("Random values generated following use of "     &

                          "procedures Image and Value were not the same " &

                          "for Discrete generator");

         end if;

         if TC_Enum_Check_Failed then

            Report.Failed("Random values generated following use of "     &

                          "procedures Image and Value were not the same " &

                          "for Enumeration generator");

         end if;

         if TC_Float_Check_Failed then

            Report.Failed("Random values generated following use of "     &

                          "procedures Image and Value were not the same " &

                          "for Float generator");

         end if;

      end Objective_2;

      Objective_3:

         -- Check that a call to Function Value, with a string value that is

         -- not the image of any generator state, is a bounded error. This

         -- error either raises Constraint_Error or Program_Error, or is

         -- accepted. (See Technical Corrigendum 1).

      declare

         Not_A_State : constant String := ImpDef.Non_State_String;

      begin

         begin

            DState_1 := Discrete_Pack.Value(Not_A_State);

            if Not_A_State /= "**NONE**" then

               Report.Failed("Exception not raised by Function " &

                             "Ada.Numerics.Discrete_Random.Value when " &

                             "provided a string input that does not "   &

                             "represent the state of a random number "  &

                             "generator");

            else

               Report.Comment("All strings represent states for Function " &

                             "Ada.Numerics.Discrete_Random.Value");

            end if;

            Discrete_Pack.Reset(DGen_1, DState_1);

         exception

            when Constraint_Error => null;  -- OK, expected exception.

               Report.Comment("Constraint_Error raised by Function " &

                             "Ada.Numerics.Discrete_Random.Value when " &

                             "provided a string input that does not "   &

                             "represent the state of a random number "  &

                             "generator");

            when Program_Error => -- OK, expected exception.

               Report.Comment("Program_Error raised by Function " &

                             "Ada.Numerics.Discrete_Random.Value when " &

                             "provided a string input that does not "   &

                             "represent the state of a random number "  &

                             "generator");

            when others =>

               Report.Failed("Unexpected exception raised by Function " &

                             "Ada.Numerics.Discrete_Random.Value when " &

                             "provided a string input that does not "   &

                             "represent the state of a random number "  &

                             "generator");

         end;

         begin

            EState_1 := Card_Pack.Value(Not_A_State);

            if Not_A_State /= "**NONE**" then

               Report.Failed("Exception not raised by Function " &

                             "Ada.Numerics.Discrete_Random.Value when " &

                             "provided a string input that does not "   &

                             "represent the state of an enumeration "   &

                             "random number generator");

            else

               Report.Comment("All strings represent states for Function " &

                             "Ada.Numerics.Discrete_Random.Value");

            end if;

            Card_Pack.Reset(EGen_1, EState_1);

         exception

            when Constraint_Error => null;  -- OK, expected exception.

            when Program_Error => null; -- OK, expected exception.

            when others =>

               Report.Failed("Unexpected exception raised by Function " &

                             "Ada.Numerics.Discrete_Random.Value when " &

                             "provided a string input that does not "   &

                             "represent the state of an enumeration "   &

                             "random number generator");

         end;

         begin

            FState_1 := Float_Random.Value(Not_A_State);

            if Not_A_State /= "**NONE**" then

               Report.Failed("Exception not raised by an "      &

                             "instantiated version of "                &

                             "Ada.Numerics.Float_Random.Value when "   &

                             "provided a string input that does not "  &

                             "represent the state of a random number " &

                             "generator");

            else

               Report.Comment("All strings represent states for Function " &

                             "Ada.Numerics.Float_Random.Value");

            end if;

            Float_Random.Reset(FGen_1, FState_1);

         exception

            when Constraint_Error => null;  -- OK, expected exception.

            when Program_Error => null; -- OK, expected exception.

            when others =>

               Report.Failed("Unexpected exception raised by an "      &

                             "instantiated version of "                &

                             "Ada.Numerics.Float_Random.Value when "   &

                             "provided a string input that does not "  &

                             "represent the state of a random number " &

                             "generator");

         end;

      end Objective_3;

   exception

      when others => Report.Failed ("Exception raised in Test_Block");

   end Test_Block;

   Report.Result;

end CXA5012;