old-autovect-branch/gcc/testsuite/ada/acats/tests/c3/c3a0003.a

   1 -- C3A0003.A
   2 --
   3 --                             Grant of Unlimited Rights
   4 --
   5 --     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
   6 --     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
   7 --     unlimited rights in the software and documentation contained herein.
   8 --     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
   9 --     this public release, the Government intends to confer upon all
  10 --     recipients unlimited rights  equal to those held by the Government.
  11 --     These rights include rights to use, duplicate, release or disclose the
  12 --     released technical data and computer software in whole or in part, in
  13 --     any manner and for any purpose whatsoever, and to have or permit others
  14 --     to do so.
  15 --
  16 --                                    DISCLAIMER
  17 --
  18 --     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
  19 --     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
  20 --     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
  21 --     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
  22 --     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
  23 --     PARTICULAR PURPOSE OF SAID MATERIAL.
  24 --*
  25 --
  26 -- OBJECTIVE:
  27 --      Check that a function in a generic instance can be called using
  28 --      an access-to-subprogram value.
  29 --
  30 -- TEST DESCRIPTION:
  31 --      Declare a numeric type in the visible part of a generic package.
  32 --      Declare an access to function type.  Declare three different sine
  33 --      functions that can be referred to by the access to function type.
  34 --
  35 --      In the main program, instantiate the generic.  Call each function
  36 --      indirectly by dereferencing the access value.
  37 --
  38 --
  39 -- CHANGE HISTORY:
  40 --      06 Dec 94   SAIC    ACVC 2.0
  41 --
  42 --!
  43
  44 generic
  45    type Real_Num is digits <>;
  46
  47 package C3A0003_0 is
  48
  49    TC_Call_Tag : Natural := 0;
  50
  51    -- Type accesses to any sine function
  52    type Sine_Function_Ptr is access function
  53       (Angle : in Real_Num) return Real_Num;
  54
  55    function Sine_Calc_Fast  (Angle : in Real_Num) return Real_Num;
  56
  57    function Sine_Calc_Acc   (Angle : in Real_Num) return Real_Num;
  58
  59    function Sine_Calc_Table (Angle : in Real_Num) return Real_Num;
  60
  61 end C3A0003_0;
  62
  63
  64 -----------------------------------------------------------------------------
  65
  66
  67 package body C3A0003_0 is
  68
  69    function Sine_Calc_Fast (Angle : in Real_Num) return Real_Num is
  70       Sine_Num : Real_Num := 1.0;
  71    begin
  72       TC_Call_Tag := 1;
  73       return Sine_Num;
  74    end Sine_Calc_Fast;
  75
  76
  77    function Sine_Calc_Acc (Angle : in Real_Num) return Real_Num is
  78       Sine_Num : Real_Num := 0.0;
  79    begin
  80       TC_Call_Tag := 2;
  81       return Sine_Num;
  82    end Sine_Calc_Acc;
  83
  84
  85    function Sine_Calc_Table (Angle : in Real_Num) return Real_Num is
  86       Sine_Num : Real_Num := -1.0;
  87    begin
  88       TC_Call_Tag := 3;
  89       return Sine_Num;
  90    end Sine_Calc_Table;
  91
  92 end C3A0003_0;
  93
  94 -----------------------------------------------------------------------------
  95
  96 with Report;
  97 with C3A0003_0;
  98
  99 procedure C3A0003 is
 100
 101    type Real is digits 5;
 102
 103    Subtype Trig_Float is Real range -1.0 .. 1.0;
 104
 105    package Trig is new C3A0003_0 (Real_Num => Trig_Float);
 106
 107    Sine_Access : Trig.Sine_Function_Ptr;
 108    X, Theta    : Trig_Float := 0.0;
 109
 110 begin
 111
 112    Report.Test ("C3A0003", "Check that a function in a generic instance can "
 113                          & "be called using an access-to-subprogram value");
 114
 115    Sine_Access := Trig.Sine_Calc_Fast'Access;
 116
 117    -- Invoking Sine function designated by access value
 118    X := Sine_Access.all(Theta);
 119
 120    If Trig.TC_Call_Tag /= 1 then
 121       Report.Failed ("Incorrect Sine_Calc_Fast result");
 122    end if;
 123
 124    Sine_Access := Trig.Sine_Calc_Acc'Access;
 125
 126    -- Invoking Sine function designated by access value
 127    X := Sine_Access.all(Theta);
 128
 129    If Trig.TC_Call_Tag /= 2 then
 130       Report.Failed ("Incorrect Sine_Calc_Acc result");
 131    end if;
 132
 133    Sine_Access := Trig.Sine_Calc_Table'Access;
 134
 135    -- Invoking Sine function designated by access value
 136    X := Sine_Access.all(Theta);
 137
 138    If Trig.TC_Call_Tag /= 3 then
 139       Report.Failed ("Incorrect Sine_Calc_Table result");
 140    end if;
 141
 142    Report.Result;
 143
 144 end C3A0003;