1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
-- C3A0001.A
--
-- Grant of Unlimited Rights
--
-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
-- unlimited rights in the software and documentation contained herein.
-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
-- this public release, the Government intends to confer upon all
-- recipients unlimited rights equal to those held by the Government.
-- These rights include rights to use, duplicate, release or disclose the
-- released technical data and computer software in whole or in part, in
-- any manner and for any purpose whatsoever, and to have or permit others
-- to do so.
--
-- DISCLAIMER
--
-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
-- PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- OBJECTIVE:
-- Check that access to subprogram type can be used to select and
-- invoke functions with appropriate arguments dynamically.
--
-- TEST DESCRIPTION:
-- Declare an access to function type in a package specification.
-- Declare three different sine functions that can be referred to by
-- the access to function type.
--
-- In the main program, call each function indirectly by dereferencing
-- the access value.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
package C3A0001_0 is
TC_Call_Tag : Natural := 0;
-- Type accesses to any sine function
type Sine_Function_Ptr is access function
(Angle : in Float) return Float;
-- Three 'Sine' functions that model an application situation in which
-- one function might be chosen when speed is important, another (using
-- a different algorithm) might be chosen when accuracy is important,
-- and so on.
function Sine_Calc_Fast (Angle : in Float) return Float;
function Sine_Calc_Acc (Angle : in Float) return Float;
function Sine_Calc_Table (Angle : in Float) return Float;
end C3A0001_0;
-----------------------------------------------------------------------------
package body C3A0001_0 is
function Sine_Calc_Fast (Angle : in Float) return Float is
begin
TC_Call_Tag := 1;
return 1.0;
end Sine_Calc_Fast;
function Sine_Calc_Acc (Angle : in Float) return Float is
begin
TC_Call_Tag := 2;
return 0.0;
end Sine_Calc_Acc;
function Sine_Calc_Table (Angle : in Float) return Float is
begin
TC_Call_Tag := 3;
return -1.0;
end Sine_Calc_Table;
end C3A0001_0;
-----------------------------------------------------------------------------
with Report;
with C3A0001_0;
procedure C3A0001 is
Sine_Access : C3A0001_0.Sine_Function_Ptr;
X, Theta : Float := 0.0;
begin
Report.Test ("C3A0001", "Check that access to subprogram can be " &
"used to select and invoke an operation with " &
"appropriate arguments dynamically");
Sine_Access := C3A0001_0.Sine_Calc_Fast'Access;
-- Invoking Sine function designated by access value
X := Sine_Access(Theta);
If C3A0001_0.TC_Call_Tag /= 1 then
Report.Failed ("Incorrect Sine_Calc_Fast result");
end if;
Sine_Access := C3A0001_0.Sine_Calc_Acc'Access;
-- Invoking Sine function designated by access value
X := Sine_Access(Theta);
If C3A0001_0.TC_Call_Tag /= 2 then
Report.Failed ("Incorrect Sine_Calc_Acc result");
end if;
Sine_Access := C3A0001_0.Sine_Calc_Table'Access;
-- Invoking Sine function designated by access value
X := Sine_Access(Theta);
If C3A0001_0.TC_Call_Tag /= 3 then
Report.Failed ("Incorrect Sine_Calc_Table result");
end if;
Report.Result;
end C3A0001;
|
